The combination of endoscopic ultrasound with endoscopic treatment of type 1 gastric variceal hemorrhage may improve the robustness and generalizability of the findings in future studies.Moreover,the esophageal varice...The combination of endoscopic ultrasound with endoscopic treatment of type 1 gastric variceal hemorrhage may improve the robustness and generalizability of the findings in future studies.Moreover,the esophageal varices should also be included in the evaluation of treatment efficacy in subsequent studies to reach a more convincing conclusion.展开更多
Purpose: The study was to evaluate the efficacy of cyanoacrylate tissue adhesive (CTA) application in corneal perforations. Method: This was a prospective study on 20 patients of corneal perforations who received cyan...Purpose: The study was to evaluate the efficacy of cyanoacrylate tissue adhesive (CTA) application in corneal perforations. Method: This was a prospective study on 20 patients of corneal perforations who received cyanoacrylate tissue adhesive application as treatment between March 2021 and March 2022 at Preah Ang Duong Hospital. The primary outcome measure was success rate of CTA application, while the secondary outcome was to measure postoperative best-corrected visual acuity (BCVA) and ocular complications. Results: The mean age of patients was 44.15 ± 16.05 years old and 7 (35%) were female. Causes of perforation were microbial infection in 12 patients (60%), trauma in 5 patients (25%), and sterile melting in 3 patients (15%). The perforation of size smaller than 1.5 mm was in 8 patients (40%) while 12 patients (60%) had perforated size between 1.5 mm to 3 mm. The perforation was 60% (12 patients) central, 25% (5 patients) paracentral, and 15% (3 patients) peripherally. Out of 20 patients, 5 patients (25%) received CTA application more than 1 time. The mean glue retention was 57.60 ± 31.84 days. Success rate of glue application (defined as intact globe without surgical intervention regardless of number of CTA applications) was 85%. At the last visit, 7 patients (35%) had BCVA of 6/120 or better. Common complications were uveitis (45%), ocular hypertension (30%), cataract (25%) and neovascularization (20%). No serious complications were found. Conclusion: Cyanoacrylate tissue adhesive is an effective treatment option in sealing corneal perforations with no serious complications. .展开更多
Background Reconstruction of damaged tissues requires both surface hemostasis and tissue bridging.Tissues with damage resulting from physical trauma or surgical treatments may have arbitrary surface topographies,makin...Background Reconstruction of damaged tissues requires both surface hemostasis and tissue bridging.Tissues with damage resulting from physical trauma or surgical treatments may have arbitrary surface topographies,making tissue bridging challenging.Methods This study proposes a tissue adhesive in the form of adhesive cryogel particles(ACPs) made from chitosan,acrylic acid,1-ethyl-3-(3-dimethylaminopropyl) carbodiimide(EDC) and N-hydroxysuccinimide(NHS).The adhesion performance was examined by the 180-degree peel test to a collection of tissues including porcine heart,intestine,liver,muscle,and stomach.Cytotoxicity of ACPs was evaluated by cell proliferation of human normal liver cells(LO2)and human intestinal epithelial cells(Caco-2).The degree of inflammation and biodegradability were examined in dorsal subcutaneous rat models.The ability of ACPs to bridge irregular tissue defects was assessed using porcine heart,liver,and kidney as the ex vivo models.Furthermore,a model of repairing liver rupture in rats and an intestinal anastomosis in rabbits were established to verify the effectiveness,biocompatibility,and applicability in clinical surgery.Results ACPs are applicable to confined and irregular tissue defects,such as deep herringbone grooves in the parenchyma organs and annular sections in the cavernous organs.ACPs formed tough adhesion between tissues[(670.9±50.1) J/m^(2) for the heart,(607.6±30.0) J/m^(2) for the intestine,(473.7±37.0) J/m^(2) for the liver,(186.1±13.3) J/m^(2) for the muscle,and(579.3±32.3) J/m^(2) for the stomach].ACPs showed considerable cytocompatibility in vitro study,with a high level of cell viability for 3 d[(98.8±1.2)%for LO2 and(98.3±1.6)%for Caco-2].It has comparable inflammation repair in a ruptured rat liver(P=0.58 compared with suture closure),the same with intestinal anastomosis in rabbits(P=0.40 compared with suture anastomosis).Additionally,ACP-based intestinal anastomosis(less than 30 s) was remarkably faster than the conventional suturing process(more than 10 min).When ACPs degrade after surgery,the tissues heal across the adhesion interface.Conclusions ACPs are promising as the adhesive for clinical operations and battlefield rescue,with the capability to bridge irregular tissue defects rapidly.展开更多
Background: The use of biological sealants has greatly increased during nephron sparing surgery. In many cases the bulk of the material was erroneously mistaken for tumor recurrence. Objective: To describe the charact...Background: The use of biological sealants has greatly increased during nephron sparing surgery. In many cases the bulk of the material was erroneously mistaken for tumor recurrence. Objective: To describe the characteristic appearance of biological adhesive material used for tumor bed closure on computerized tomography (CT) following nephrone sparing surgery (NSS) for renal cell carcinoma, in order to differentiate between typical features of the adhesive material and local tumor recurrence. Design, Setting and Participants: We retrospectively reviewed follow-up CT scans of 120 patients who underwent NSS for T1N0M0 RCC. In all cases tumor bed was closed during surgery with biological tissue adhesive (BioGlue). Results and Limitations: During 1994-2009, 120 patients with a single T1 renal cell carcinoma lesion, underwent NSS with closure of tumor bed with bio adhesive material. There were 66 males and 47 females with mean age of 58.7 years (median: 58 years, range: 28 - 85 years). Mean follow-up time was 45 ± 34 months (median 42, range 12 - 168). During follow-up, 3 patients had local recurrence at the site of previous enucleated lesion. In the first post-operative CT scan the BG appeared as a heterogeneous mass with sharp edges measuring 20 - 70 HU with no attenuation following the injection of contrast material. In subsequent follow-up scans the BG in most patients remained stable in size;in few patients slight reduction in size was observed probably due to the resolution of post-operative hematoma. Tumor recurrence that was documented in 3 patients was seen as a heterogeneous mass with attenuation of more than 20 HU following the injection of contrast material. In sequential CT’s the mass was increasing in size. Conclusions: BG appears as a non-enhancing stable mass in sequential CT’s following NSS, hence could be differentiated from local tumor recurrence. The ability to differentiate between normal post-operative status and recurrence could be compromised in patients with decreased renal function in whom contrast material could not be used.展开更多
The use of biopolymers as bioadhesives for human tissue is becoming a preferred alternative to suturing due to their superior adhesive, biocompatible, and biodegradable properties. In this work, low molecular weight p...The use of biopolymers as bioadhesives for human tissue is becoming a preferred alternative to suturing due to their superior adhesive, biocompatible, and biodegradable properties. In this work, low molecular weight poly(L-lactide-co-ε-caprolactone) (P(LA-co-CL) was synthesized to achieve the glass transition temperature (Tg) of the copolymer at ambient temperature so that during application on the skin, the copolymer when combined with chitosan (CHI) into the CHI/P(LA-co-CL) film could provide the strong support at the injury site. Using alcohols with different numbers of hydroxyl groups as the co-initiator in polymerization provided the distinctive characteristics of copolymers. Among all copolymers synthesized, P(LA-co-CL) copolymer using pentaerythritol as the co-initiator when combined with CHI at the ratio of copolymer/CHI at 70/30 yielded the good film properties in tissue adhesion and tetracycline hydrochloride release.展开更多
AIMTo investigate the expression of transcription factors Slug in human lens epithelial cells (HLECs) undergoing epithelial-mesenchymal transition (EMT) induced by connective tissue growth factor (CTGF).METHODSHLECs w...AIMTo investigate the expression of transcription factors Slug in human lens epithelial cells (HLECs) undergoing epithelial-mesenchymal transition (EMT) induced by connective tissue growth factor (CTGF).METHODSHLECs were treated with CTGF of different concentrations (20, 50 and 100 ng/mL) or without CTGF (control) for 24h. The morphological changes of HLECs were analysed by microscopy. The expression and cellular localization of Slug was evaluated by immumo-fluorescence. Expressions of Slug, E-cadherin and alpha smooth muscle actin (α-SMA) were further determined by Western blot analysis.RESULTSHLECs showed spidle fibrolasts-like characteristics and loosely connected each other after CTGF treatment. The immuno-fluorescence staining indicated that Slug was localized in the nuclei and its expression was induced by CTGF. The relative expressions of Slug protein were 1.64±0.11, 1.96 ±0.03, 3.12 ±0.10, and 4.08±0.14, respectively, in response to control group and treatment with CTGF of 20, 50 and 100 ng/mL (F=443.86, P<0.01). The increased Slug protein levels were correlated well with up-expression of α-SMA (0.78±0.05, 0.85±0.06, 2.17±0.15, 2.86±0.10; F=449.85, P<0.01) and down-expression of E-cadherin (2.50±0.11, 1.79±0.26, 1.05±0.14, 0.63±0.08; F=101.55, P<0.01).CONCLUSIONTranscription factor Slug may be involved in EMT of HLECs induced by CTGF in vitro.展开更多
This study aimed to explore the molecular mechanism in tumor invasion and metastasis. The expression of matrix metalloproteinase 2, 9 (MMP 2, MMP 9), tissue inhibitor 1 of matrix metalloproteinase (TIMP 1), c...This study aimed to explore the molecular mechanism in tumor invasion and metastasis. The expression of matrix metalloproteinase 2, 9 (MMP 2, MMP 9), tissue inhibitor 1 of matrix metalloproteinase (TIMP 1), cell adhesion molecule 44 variant 6 (CD44v6), HER2/neu and p53 was investigated in 154 patients with head and neck squamous cell carcinoma (SCC) by ABC and ImmunoMax immunohistochemical method. Their clinical relevance and correlation were analysed. The expression of MMP 2, MMP 9, TIMP 1, CD44v6, HER2/neu and p53 was found in cancer cells in 87.01%, 85.71%, 68.18%, 98.05%, 55.19% and 50.65% cases respectively. Linear regression and correlation analysis revealed that there was close positive relationship ( P <0.05) between the expression of MMP 2 and MMP 9, TIMP 1 and CD44v6, HER2/neu and MMP 9, MMP 2 and p53. Up regulation of MMP 2 was accompanied by advanced T stage ( P <0.01) . There was also a trend of MMP 2 expression being related with tumor metastasis. Increased expression of HER2/neu was found in patients with tumor recurrence( P <0.05). The expression of TIMP 1 was higher in laryngeal cancer than that in pharyngeal cancer, and higher in keratinizing and non keratinizing SCC than that in basaloid SCC( P <0.05). These findings suggested that MMP 2 and MMP 9, HER2/neu and MMP 9, MMP 2 and p53 had a coordinate function in aggression of tumor; that MMP 2 had a more important function than MMP 9 in tumor invasion and metastasis; and that HER2/neu might serve as a biomarker for poor prognosis in HNSCC.展开更多
As a superior alternative to sutures,tissue adhesives have been developed significantly in recent years.However,existing tissue adhesives struggle to form fast and stable adhesion between tissue interfaces,bond weakly...As a superior alternative to sutures,tissue adhesives have been developed significantly in recent years.However,existing tissue adhesives struggle to form fast and stable adhesion between tissue interfaces,bond weakly in wet environments and lack bioactivity.In this study,a degradable and bioactive citrate-based polyurethane adhesive is constructed to achieve rapid and strong tissue adhesion.The hydrophobic layer was created with polycaprolactone to overcome the bonding failure between tissue and adhesion layer in wet environments,which can effectively improve the wet bonding strength.This citrate-based polyurethane adhesive provides rapid,non-invasive,liquid-tight and seamless closure of skin incisions,overcoming the limitations of sutures and commercial tissue adhesives.In addition,it exhibits biocompatibility,biodegradability and hemostatic properties.The degradation product citrate could promote the process of angiogenesis and accelerate wound healing.This study provides a novel approach to the development of a fast-adhering wet tissue adhesive and provides a valuable contribution to the development of polyurethane-based tissue adhesives.展开更多
We present a case of symptomatic perihepatic adhesions,which developed after a pregnancy complicated by hemolysis,elevated liver enzymes and low platelet(HELLP)syndrome,in which a subcapsular liver hematoma occurred.O...We present a case of symptomatic perihepatic adhesions,which developed after a pregnancy complicated by hemolysis,elevated liver enzymes and low platelet(HELLP)syndrome,in which a subcapsular liver hematoma occurred.Our patient presented with complaints of persistent,severe right-sided upper abdominal pain.The complaints developed gradually,one year after a pregnancy that had been complicated by HELLP syndrome with a subcapsular liver hematoma.The hematoma had resolved spontaneously.An upperabdominal magnetic resonance imaging revealed a density between liver and diaphragm at the site of the former subcapsular hematoma,suspect of perihepatic adhesions.The presence of perihepatic adhesions was confirmed during a laparoscopy and treated by adhesiolysis in the same session.The adhesions may have developed in response to the degradation process of the subcapsular liver hematoma during conservative treatment.This case of perihepatic adhesions may therefor be the first presentation of a long term sequel of subcapsular liver hematoma in HELLP syndrome.展开更多
Postoperative adhesion(POA)widely occurs in soft tissues and usually leads to chronic pain,dysfunction of adjacent organs and some acute complications,seriously reducing patients’quality of life and even being life-t...Postoperative adhesion(POA)widely occurs in soft tissues and usually leads to chronic pain,dysfunction of adjacent organs and some acute complications,seriously reducing patients’quality of life and even being life-threatening.Except for adhesiolysis,there are few effective methods to release existing adhesion.However,it requires a second operation and inpatient care and usually triggers recurrent adhesion in a great incidence.Hence,preventing POA formation has been regarded as the most effective clinical strategy.Biomaterials have attracted great attention in preventing POA because they can act as both barriers and drug carriers.Nevertheless,even though much reported research has been demonstrated their efficacy on POA inhibition to a certain extent,thoroughly preventing POA formation is still challenging.Meanwhile,most biomaterials for POA prevention were designed based on limited experiences,not a solid theoretical basis,showing blindness.Hence,we aimed to provide guidance for designing anti-adhesion materials applied in different soft tissues based on the mechanisms of POA occurrence and development.We first classified the postoperative adhesions into four categories according to the different components of diverse adhesion tissues,and named them as“membranous adhesion”,“vascular adhesion”,“adhesive adhesion”and“scarred adhesion”,respectively.Then,the process of the occurrence and development of POA were analyzed,and the main influencing factors in different stages were clarified.Further,we proposed seven strategies for POA prevention by using biomaterials according to these influencing factors.Meanwhile,the relevant practices were summarized according to the corresponding strategies and the future perspectives were analyzed.展开更多
Adhesions are the most frequent complication of abdominopelvic surgery,yet the extent of the problem,and its serious consequences,has not been adequately recognized.Adhesions evolved as a life-saving mecha-nism to lim...Adhesions are the most frequent complication of abdominopelvic surgery,yet the extent of the problem,and its serious consequences,has not been adequately recognized.Adhesions evolved as a life-saving mecha-nism to limit the spread of intraperitoneal inflammatory conditions.Three different pathophysiological mechanisms can independently trigger adhesion formation.Mesothelial cell injury and loss during operations,tissue hypoxia and inflammation each promotes adhesion formation separately,and potentiate the effect of each other.Studies have repeatedly demonstrated that interruption of a single pathway does not completely prevent adhesion formation.This review summarizes the pathogenesis of adhesion formation and the results of single gene therapy interventions.It explores the prom-ising role of combinatorial gene therapy and vector modif ications for the prevention of adhesion formation in order to stimulate new ideas and encourage rapid advancements in this field.展开更多
Hydrogels with multifunctionalities,including sufficient bonding strength,injectability and self-healing capacity,responsive-adhesive ability,fault-tolerant and repeated tissue adhesion,are urgently demanded for invas...Hydrogels with multifunctionalities,including sufficient bonding strength,injectability and self-healing capacity,responsive-adhesive ability,fault-tolerant and repeated tissue adhesion,are urgently demanded for invasive wound closure and wound healing.Motivated by the adhesive mechanism of mussel and brown algae,bioinspired dynamic bonds cross-linked multifunctional hydrogel adhesive is designed based on sodium alginate(SA),gelatin(GT)and protocatechualdehyde,with ferric ions added,for sutureless post-wound-closure.The dynamic hydrogel cross-linked through Schiff base bond,catechol-Fe coordinate bond and the strong interaction between GT with temperature-dependent phase transition and SA,endows the resulting hydrogel with sufficient mechanical and adhesive strength for efficient wound closure,injectability and self-healing capacity,and repeated closure of reopened wounds.Moreover,the temperature-dependent adhesive properties endowed mispositioning hydrogel to be removed/repositioned,which is conducive for the fault-tolerant adhesion of the hydrogel adhesives during surgery.Besides,the hydrogels present good biocompatibility,near-infrared-assisted photothermal antibacterial activity,antioxidation and repeated thermo-responsive reversible adhesion and good hemostatic effect.The in vivo incision closure evaluation demonstrated their capability to promote the post-wound-closure and wound healing of the incisions,indicating that the developed reversible adhesive hydrogel dressing could serve as versatile tissue sealant.展开更多
Developing a biocompatible and multifunctional adhesive hydrogel with injectability and self-healing ability for promoting wound healing is highly anticipated in various clinical applications.In this paper,we present ...Developing a biocompatible and multifunctional adhesive hydrogel with injectability and self-healing ability for promoting wound healing is highly anticipated in various clinical applications.In this paper,we present a novel natural biopolymer-derived hydrogel based on the aldehyde-modified oxidized guar gum(OGG)and the carboxymethyl chitosan(CMCS)for efficiently improving wound healing with the encapsulation of vascular endothelial growth factor(VEGF).As the hydrogels are synthesized via the dynamically reversible Schiff base linkages,it is imparted with excellent self-healing ability and good shear thinning behavior,which make the hydrogel be easily and conveniently injected through a needle.Besides,the physiochemical properties,including porous structure,mechanical strength and swelling ratio of the hydrogel can be well controlled by regulating the concentrations of the OGG.Moreover,the hydrogel can attain strong adhesion to the tissues at physiological temperature based on the Schiff base between the aldehyde group on the hydrogel and the amino group on the tissue.Based on these features,we have demonstrated that the VEGF encapsulated hydrogel can adhere tightly to the defect tissue and improve wound repair in the rat model of defected skin by promoting cell proliferation,angiogenesis,and collagen secretion.These results indicate that the multifunctional hydrogel is with great scientific significance and broad clinical application prospects.展开更多
A key feature that distinguishes cancer cells from all other cells is their capability to spread throughout the body.Although how cancer cells collectively migrate by following molecular rules which influence the stat...A key feature that distinguishes cancer cells from all other cells is their capability to spread throughout the body.Although how cancer cells collectively migrate by following molecular rules which influence the state of cell-cell adhesion contacts has been comprehensively formulated,the impact of physical interactions on cell spreading remains less understood.Cumulative effects of physical interactions exist as the interplay between various physical parameters such as(1)tissue surface tension,(2)viscoelasticity caused by collective cell migration,and(3)solid stress accumulated in the cell aggregate core region.This review aims to point out the role of these physical parameters in cancer cell spreading by considering and comparing the rearrangement of various mono-cultured cancer and epithelial model systems such as the fusion of two cell aggregates.While epithelial cells undergo volumetric cell rearrangement driven by the tissue surface tension,which directs cell movement from the surface to the core region of two-aggregate systems,cancer cells rather perform surface cell rearrangement.Cancer cells migrate toward the surface of the two-aggregate system driven by the solid stress while the surface tension is significantly reduced.The solid stress,accumulated in the core region of the two-aggregate system,is capable of suppressing the movement of epithelial cells that can undergo the jamming state transition;however,this stress enhances the movement of cancer cells.We have focused here on the multi-scale rheological modeling approaches that aimed at reproducing and understanding these biological systems.展开更多
BACKGROUND According to practice guidelines,endoscopic band ligation(EBL)and endoscopic tissue adhesive injection(TAI)are recommended for treating bleeding from esophagogastric varices.However,EBL and TAI are known to...BACKGROUND According to practice guidelines,endoscopic band ligation(EBL)and endoscopic tissue adhesive injection(TAI)are recommended for treating bleeding from esophagogastric varices.However,EBL and TAI are known to cause serious complications,such as hemorrhage from dislodged ligature rings caused by EBL and hemorrhage from operation-related ulcers resulting from TAI.However,the optimal therapy for mild to moderate type 1 gastric variceal hemorrhage(GOV1)has not been determined.Therefore,the aim of this study was to discover an individualized treatment for mild to moderate GOV1.AIM To compare the efficacy,safety and costs of EBL and TAI for the treatment of mild and moderate GOV1.METHODS A clinical analysis of the data retrieved from patients with mild or moderate GOV1 gastric varices who were treated under endoscopy was also conducted.Patients were allocated to an EBL group or an endoscopic TAI group.The differences in the incidence of varicose relief,operative time,operation success rate,mortality rate within 6 wk,rebleeding rate,6-wk operation-related ulcer healing rate,complication rate and average operation cost were compared between the two groups of patients.RESULTS The total effective rate of the two treatments was similar,but the efficacy of EBL(66.7%)was markedly better than that of TAI(39.2%)(P<0.05).The operation success rate in both groups was 100%,and the 6-wk mortality rate in both groups was 0%.The average operative time(26 min)in the EBL group was significantly shorter than that in the TAI group(46 min)(P<0.01).The rate of delayed postoperative rebleeding in the EBL group was significantly lower than that in the TAI group(11.8%vs 45.1%)(P<0.01).At 6 wk after the operation,the healing rate of operation-related ulcers in the EBL group was 80.4%,which was significantly greater than that in the TAI group(35.3%)(P<0.01).The incidence of postoperative complications in the two groups was similar.The average cost and other related economic factors were greater for the EBL than for the TAI(P<0.01).CONCLUSION For mild to moderate GOV1,patients with EBL had a greater one-time varix eradication rate,a greater 6-wk operation-related ulcer healing rate,a lower delayed rebleeding rate and a lower cost than patients with TAI.展开更多
文摘The combination of endoscopic ultrasound with endoscopic treatment of type 1 gastric variceal hemorrhage may improve the robustness and generalizability of the findings in future studies.Moreover,the esophageal varices should also be included in the evaluation of treatment efficacy in subsequent studies to reach a more convincing conclusion.
文摘Purpose: The study was to evaluate the efficacy of cyanoacrylate tissue adhesive (CTA) application in corneal perforations. Method: This was a prospective study on 20 patients of corneal perforations who received cyanoacrylate tissue adhesive application as treatment between March 2021 and March 2022 at Preah Ang Duong Hospital. The primary outcome measure was success rate of CTA application, while the secondary outcome was to measure postoperative best-corrected visual acuity (BCVA) and ocular complications. Results: The mean age of patients was 44.15 ± 16.05 years old and 7 (35%) were female. Causes of perforation were microbial infection in 12 patients (60%), trauma in 5 patients (25%), and sterile melting in 3 patients (15%). The perforation of size smaller than 1.5 mm was in 8 patients (40%) while 12 patients (60%) had perforated size between 1.5 mm to 3 mm. The perforation was 60% (12 patients) central, 25% (5 patients) paracentral, and 15% (3 patients) peripherally. Out of 20 patients, 5 patients (25%) received CTA application more than 1 time. The mean glue retention was 57.60 ± 31.84 days. Success rate of glue application (defined as intact globe without surgical intervention regardless of number of CTA applications) was 85%. At the last visit, 7 patients (35%) had BCVA of 6/120 or better. Common complications were uveitis (45%), ocular hypertension (30%), cataract (25%) and neovascularization (20%). No serious complications were found. Conclusion: Cyanoacrylate tissue adhesive is an effective treatment option in sealing corneal perforations with no serious complications. .
基金supported by the National Natural Science Foundation of China (12102388, T2125009, 92048302)the National Key Research and Development Program of China 2017 (YFA0701100)the Fundamental Research Funds for the Central Universities (226-2022-00141, 2022QZJH52)。
文摘Background Reconstruction of damaged tissues requires both surface hemostasis and tissue bridging.Tissues with damage resulting from physical trauma or surgical treatments may have arbitrary surface topographies,making tissue bridging challenging.Methods This study proposes a tissue adhesive in the form of adhesive cryogel particles(ACPs) made from chitosan,acrylic acid,1-ethyl-3-(3-dimethylaminopropyl) carbodiimide(EDC) and N-hydroxysuccinimide(NHS).The adhesion performance was examined by the 180-degree peel test to a collection of tissues including porcine heart,intestine,liver,muscle,and stomach.Cytotoxicity of ACPs was evaluated by cell proliferation of human normal liver cells(LO2)and human intestinal epithelial cells(Caco-2).The degree of inflammation and biodegradability were examined in dorsal subcutaneous rat models.The ability of ACPs to bridge irregular tissue defects was assessed using porcine heart,liver,and kidney as the ex vivo models.Furthermore,a model of repairing liver rupture in rats and an intestinal anastomosis in rabbits were established to verify the effectiveness,biocompatibility,and applicability in clinical surgery.Results ACPs are applicable to confined and irregular tissue defects,such as deep herringbone grooves in the parenchyma organs and annular sections in the cavernous organs.ACPs formed tough adhesion between tissues[(670.9±50.1) J/m^(2) for the heart,(607.6±30.0) J/m^(2) for the intestine,(473.7±37.0) J/m^(2) for the liver,(186.1±13.3) J/m^(2) for the muscle,and(579.3±32.3) J/m^(2) for the stomach].ACPs showed considerable cytocompatibility in vitro study,with a high level of cell viability for 3 d[(98.8±1.2)%for LO2 and(98.3±1.6)%for Caco-2].It has comparable inflammation repair in a ruptured rat liver(P=0.58 compared with suture closure),the same with intestinal anastomosis in rabbits(P=0.40 compared with suture anastomosis).Additionally,ACP-based intestinal anastomosis(less than 30 s) was remarkably faster than the conventional suturing process(more than 10 min).When ACPs degrade after surgery,the tissues heal across the adhesion interface.Conclusions ACPs are promising as the adhesive for clinical operations and battlefield rescue,with the capability to bridge irregular tissue defects rapidly.
文摘Background: The use of biological sealants has greatly increased during nephron sparing surgery. In many cases the bulk of the material was erroneously mistaken for tumor recurrence. Objective: To describe the characteristic appearance of biological adhesive material used for tumor bed closure on computerized tomography (CT) following nephrone sparing surgery (NSS) for renal cell carcinoma, in order to differentiate between typical features of the adhesive material and local tumor recurrence. Design, Setting and Participants: We retrospectively reviewed follow-up CT scans of 120 patients who underwent NSS for T1N0M0 RCC. In all cases tumor bed was closed during surgery with biological tissue adhesive (BioGlue). Results and Limitations: During 1994-2009, 120 patients with a single T1 renal cell carcinoma lesion, underwent NSS with closure of tumor bed with bio adhesive material. There were 66 males and 47 females with mean age of 58.7 years (median: 58 years, range: 28 - 85 years). Mean follow-up time was 45 ± 34 months (median 42, range 12 - 168). During follow-up, 3 patients had local recurrence at the site of previous enucleated lesion. In the first post-operative CT scan the BG appeared as a heterogeneous mass with sharp edges measuring 20 - 70 HU with no attenuation following the injection of contrast material. In subsequent follow-up scans the BG in most patients remained stable in size;in few patients slight reduction in size was observed probably due to the resolution of post-operative hematoma. Tumor recurrence that was documented in 3 patients was seen as a heterogeneous mass with attenuation of more than 20 HU following the injection of contrast material. In sequential CT’s the mass was increasing in size. Conclusions: BG appears as a non-enhancing stable mass in sequential CT’s following NSS, hence could be differentiated from local tumor recurrence. The ability to differentiate between normal post-operative status and recurrence could be compromised in patients with decreased renal function in whom contrast material could not be used.
文摘The use of biopolymers as bioadhesives for human tissue is becoming a preferred alternative to suturing due to their superior adhesive, biocompatible, and biodegradable properties. In this work, low molecular weight poly(L-lactide-co-ε-caprolactone) (P(LA-co-CL) was synthesized to achieve the glass transition temperature (Tg) of the copolymer at ambient temperature so that during application on the skin, the copolymer when combined with chitosan (CHI) into the CHI/P(LA-co-CL) film could provide the strong support at the injury site. Using alcohols with different numbers of hydroxyl groups as the co-initiator in polymerization provided the distinctive characteristics of copolymers. Among all copolymers synthesized, P(LA-co-CL) copolymer using pentaerythritol as the co-initiator when combined with CHI at the ratio of copolymer/CHI at 70/30 yielded the good film properties in tissue adhesion and tetracycline hydrochloride release.
基金Supported by National Natural Science Foundation of China(No.81470614,No.81460163,No.81300786)Fundamental Research Funds for the Central Universities(No.xjj2014146)+1 种基金Specialized Research Fund for the Doctoral Program of Higher Education(No.20133601120012)Key International Communication Project of Shaanxi province(No.2012KW-31)
文摘AIMTo investigate the expression of transcription factors Slug in human lens epithelial cells (HLECs) undergoing epithelial-mesenchymal transition (EMT) induced by connective tissue growth factor (CTGF).METHODSHLECs were treated with CTGF of different concentrations (20, 50 and 100 ng/mL) or without CTGF (control) for 24h. The morphological changes of HLECs were analysed by microscopy. The expression and cellular localization of Slug was evaluated by immumo-fluorescence. Expressions of Slug, E-cadherin and alpha smooth muscle actin (α-SMA) were further determined by Western blot analysis.RESULTSHLECs showed spidle fibrolasts-like characteristics and loosely connected each other after CTGF treatment. The immuno-fluorescence staining indicated that Slug was localized in the nuclei and its expression was induced by CTGF. The relative expressions of Slug protein were 1.64±0.11, 1.96 ±0.03, 3.12 ±0.10, and 4.08±0.14, respectively, in response to control group and treatment with CTGF of 20, 50 and 100 ng/mL (F=443.86, P<0.01). The increased Slug protein levels were correlated well with up-expression of α-SMA (0.78±0.05, 0.85±0.06, 2.17±0.15, 2.86±0.10; F=449.85, P<0.01) and down-expression of E-cadherin (2.50±0.11, 1.79±0.26, 1.05±0.14, 0.63±0.08; F=101.55, P<0.01).CONCLUSIONTranscription factor Slug may be involved in EMT of HLECs induced by CTGF in vitro.
文摘This study aimed to explore the molecular mechanism in tumor invasion and metastasis. The expression of matrix metalloproteinase 2, 9 (MMP 2, MMP 9), tissue inhibitor 1 of matrix metalloproteinase (TIMP 1), cell adhesion molecule 44 variant 6 (CD44v6), HER2/neu and p53 was investigated in 154 patients with head and neck squamous cell carcinoma (SCC) by ABC and ImmunoMax immunohistochemical method. Their clinical relevance and correlation were analysed. The expression of MMP 2, MMP 9, TIMP 1, CD44v6, HER2/neu and p53 was found in cancer cells in 87.01%, 85.71%, 68.18%, 98.05%, 55.19% and 50.65% cases respectively. Linear regression and correlation analysis revealed that there was close positive relationship ( P <0.05) between the expression of MMP 2 and MMP 9, TIMP 1 and CD44v6, HER2/neu and MMP 9, MMP 2 and p53. Up regulation of MMP 2 was accompanied by advanced T stage ( P <0.01) . There was also a trend of MMP 2 expression being related with tumor metastasis. Increased expression of HER2/neu was found in patients with tumor recurrence( P <0.05). The expression of TIMP 1 was higher in laryngeal cancer than that in pharyngeal cancer, and higher in keratinizing and non keratinizing SCC than that in basaloid SCC( P <0.05). These findings suggested that MMP 2 and MMP 9, HER2/neu and MMP 9, MMP 2 and p53 had a coordinate function in aggression of tumor; that MMP 2 had a more important function than MMP 9 in tumor invasion and metastasis; and that HER2/neu might serve as a biomarker for poor prognosis in HNSCC.
基金supported by grants from the National Natural Science Foundation of China(52372272,32201109,32360234)the Key Basic Research Program of Shenzhen(JCYJ20200109150218836)+1 种基金the Guangdong Basic and Applied Basic Research Foundation(2022B1515120052,2021A1515110557)the Self-innovation Research Funding Project of Hanjiang Laboratory(HJL202202A002).
文摘As a superior alternative to sutures,tissue adhesives have been developed significantly in recent years.However,existing tissue adhesives struggle to form fast and stable adhesion between tissue interfaces,bond weakly in wet environments and lack bioactivity.In this study,a degradable and bioactive citrate-based polyurethane adhesive is constructed to achieve rapid and strong tissue adhesion.The hydrophobic layer was created with polycaprolactone to overcome the bonding failure between tissue and adhesion layer in wet environments,which can effectively improve the wet bonding strength.This citrate-based polyurethane adhesive provides rapid,non-invasive,liquid-tight and seamless closure of skin incisions,overcoming the limitations of sutures and commercial tissue adhesives.In addition,it exhibits biocompatibility,biodegradability and hemostatic properties.The degradation product citrate could promote the process of angiogenesis and accelerate wound healing.This study provides a novel approach to the development of a fast-adhering wet tissue adhesive and provides a valuable contribution to the development of polyurethane-based tissue adhesives.
文摘We present a case of symptomatic perihepatic adhesions,which developed after a pregnancy complicated by hemolysis,elevated liver enzymes and low platelet(HELLP)syndrome,in which a subcapsular liver hematoma occurred.Our patient presented with complaints of persistent,severe right-sided upper abdominal pain.The complaints developed gradually,one year after a pregnancy that had been complicated by HELLP syndrome with a subcapsular liver hematoma.The hematoma had resolved spontaneously.An upperabdominal magnetic resonance imaging revealed a density between liver and diaphragm at the site of the former subcapsular hematoma,suspect of perihepatic adhesions.The presence of perihepatic adhesions was confirmed during a laparoscopy and treated by adhesiolysis in the same session.The adhesions may have developed in response to the degradation process of the subcapsular liver hematoma during conservative treatment.This case of perihepatic adhesions may therefor be the first presentation of a long term sequel of subcapsular liver hematoma in HELLP syndrome.
基金financial support from the National Natural Science Foundation of China(Nos.32171345,T2288101,U20A20390,and 11827803)Fok Ying Tung Education Foundation(No.141039)+1 种基金International Joint Research Center of Aerospace Biotechnology and Medical Engineering,Ministry of Science and Technology of China,the 111 Project(No.B13003)the Academic Excellence Foundation of BUAA for PhD Students.
文摘Postoperative adhesion(POA)widely occurs in soft tissues and usually leads to chronic pain,dysfunction of adjacent organs and some acute complications,seriously reducing patients’quality of life and even being life-threatening.Except for adhesiolysis,there are few effective methods to release existing adhesion.However,it requires a second operation and inpatient care and usually triggers recurrent adhesion in a great incidence.Hence,preventing POA formation has been regarded as the most effective clinical strategy.Biomaterials have attracted great attention in preventing POA because they can act as both barriers and drug carriers.Nevertheless,even though much reported research has been demonstrated their efficacy on POA inhibition to a certain extent,thoroughly preventing POA formation is still challenging.Meanwhile,most biomaterials for POA prevention were designed based on limited experiences,not a solid theoretical basis,showing blindness.Hence,we aimed to provide guidance for designing anti-adhesion materials applied in different soft tissues based on the mechanisms of POA occurrence and development.We first classified the postoperative adhesions into four categories according to the different components of diverse adhesion tissues,and named them as“membranous adhesion”,“vascular adhesion”,“adhesive adhesion”and“scarred adhesion”,respectively.Then,the process of the occurrence and development of POA were analyzed,and the main influencing factors in different stages were clarified.Further,we proposed seven strategies for POA prevention by using biomaterials according to these influencing factors.Meanwhile,the relevant practices were summarized according to the corresponding strategies and the future perspectives were analyzed.
基金Supported by The United States-Egypt Science and Technology Joint Fund in cooperation with United States Department of Agriculturethe Egyptian Science and Technology Development Fund under Project 739
文摘Adhesions are the most frequent complication of abdominopelvic surgery,yet the extent of the problem,and its serious consequences,has not been adequately recognized.Adhesions evolved as a life-saving mecha-nism to limit the spread of intraperitoneal inflammatory conditions.Three different pathophysiological mechanisms can independently trigger adhesion formation.Mesothelial cell injury and loss during operations,tissue hypoxia and inflammation each promotes adhesion formation separately,and potentiate the effect of each other.Studies have repeatedly demonstrated that interruption of a single pathway does not completely prevent adhesion formation.This review summarizes the pathogenesis of adhesion formation and the results of single gene therapy interventions.It explores the prom-ising role of combinatorial gene therapy and vector modif ications for the prevention of adhesion formation in order to stimulate new ideas and encourage rapid advancements in this field.
基金supported by the National Natural Science Foundation of China (No. 51973172)Natural Science Foundation of Shaanxi Province (Nos. 2020JC-03 and 2019TD-020)+2 种基金the State Key Laboratory for Mechanical Behavior of Materials,the World-Class Universities (Disciplines) and Characteristic Development Guidance Funds for the Central UniversitiesFundamental Research Funds for the Central Universitiesthe Opening Project of the Key Laboratory of Shaanxi Province for Craniofacial Precision Medicine Research,College of Stomatology,Xi’an Jiaotong University (No. 2019LHM-KFKT008).
文摘Hydrogels with multifunctionalities,including sufficient bonding strength,injectability and self-healing capacity,responsive-adhesive ability,fault-tolerant and repeated tissue adhesion,are urgently demanded for invasive wound closure and wound healing.Motivated by the adhesive mechanism of mussel and brown algae,bioinspired dynamic bonds cross-linked multifunctional hydrogel adhesive is designed based on sodium alginate(SA),gelatin(GT)and protocatechualdehyde,with ferric ions added,for sutureless post-wound-closure.The dynamic hydrogel cross-linked through Schiff base bond,catechol-Fe coordinate bond and the strong interaction between GT with temperature-dependent phase transition and SA,endows the resulting hydrogel with sufficient mechanical and adhesive strength for efficient wound closure,injectability and self-healing capacity,and repeated closure of reopened wounds.Moreover,the temperature-dependent adhesive properties endowed mispositioning hydrogel to be removed/repositioned,which is conducive for the fault-tolerant adhesion of the hydrogel adhesives during surgery.Besides,the hydrogels present good biocompatibility,near-infrared-assisted photothermal antibacterial activity,antioxidation and repeated thermo-responsive reversible adhesion and good hemostatic effect.The in vivo incision closure evaluation demonstrated their capability to promote the post-wound-closure and wound healing of the incisions,indicating that the developed reversible adhesive hydrogel dressing could serve as versatile tissue sealant.
基金supported by the National Natural Science Foundation of China(Nos.82101184 and 82102511)the Shenzhen Fundamental Research Program(Nos.JCYJ20210324102809024,JCYJ20190813152616459 and JCYJ20210324133214038)+4 种基金the Shenzhen PhD Start-up Program(Nos.RCBS20210609103713045,ZDSYS20200811142600003,JCYJ20180228162928828,and JCYJ20190806161409092)the Natural Science Foundation of Guangdong Province(No.2020A1515110780)the Guangdong Basic and Applied Basic Research Foundation(No.2021B1515120054)the Natural Science Foundation of Jiangsu(No.BK20210021)the Research Project of Jiangsu Province Health Committee(No.M2021031).
文摘Developing a biocompatible and multifunctional adhesive hydrogel with injectability and self-healing ability for promoting wound healing is highly anticipated in various clinical applications.In this paper,we present a novel natural biopolymer-derived hydrogel based on the aldehyde-modified oxidized guar gum(OGG)and the carboxymethyl chitosan(CMCS)for efficiently improving wound healing with the encapsulation of vascular endothelial growth factor(VEGF).As the hydrogels are synthesized via the dynamically reversible Schiff base linkages,it is imparted with excellent self-healing ability and good shear thinning behavior,which make the hydrogel be easily and conveniently injected through a needle.Besides,the physiochemical properties,including porous structure,mechanical strength and swelling ratio of the hydrogel can be well controlled by regulating the concentrations of the OGG.Moreover,the hydrogel can attain strong adhesion to the tissues at physiological temperature based on the Schiff base between the aldehyde group on the hydrogel and the amino group on the tissue.Based on these features,we have demonstrated that the VEGF encapsulated hydrogel can adhere tightly to the defect tissue and improve wound repair in the rat model of defected skin by promoting cell proliferation,angiogenesis,and collagen secretion.These results indicate that the multifunctional hydrogel is with great scientific significance and broad clinical application prospects.
基金This work was supported by the Ministry of Education,Science and Technological Development of The Republic of Serbia(Contract No.451-03-68/2022-14/200135).
文摘A key feature that distinguishes cancer cells from all other cells is their capability to spread throughout the body.Although how cancer cells collectively migrate by following molecular rules which influence the state of cell-cell adhesion contacts has been comprehensively formulated,the impact of physical interactions on cell spreading remains less understood.Cumulative effects of physical interactions exist as the interplay between various physical parameters such as(1)tissue surface tension,(2)viscoelasticity caused by collective cell migration,and(3)solid stress accumulated in the cell aggregate core region.This review aims to point out the role of these physical parameters in cancer cell spreading by considering and comparing the rearrangement of various mono-cultured cancer and epithelial model systems such as the fusion of two cell aggregates.While epithelial cells undergo volumetric cell rearrangement driven by the tissue surface tension,which directs cell movement from the surface to the core region of two-aggregate systems,cancer cells rather perform surface cell rearrangement.Cancer cells migrate toward the surface of the two-aggregate system driven by the solid stress while the surface tension is significantly reduced.The solid stress,accumulated in the core region of the two-aggregate system,is capable of suppressing the movement of epithelial cells that can undergo the jamming state transition;however,this stress enhances the movement of cancer cells.We have focused here on the multi-scale rheological modeling approaches that aimed at reproducing and understanding these biological systems.
基金Supported by the Guizhou Provincial Science and Technology Program,No.[2020]4Y004.
文摘BACKGROUND According to practice guidelines,endoscopic band ligation(EBL)and endoscopic tissue adhesive injection(TAI)are recommended for treating bleeding from esophagogastric varices.However,EBL and TAI are known to cause serious complications,such as hemorrhage from dislodged ligature rings caused by EBL and hemorrhage from operation-related ulcers resulting from TAI.However,the optimal therapy for mild to moderate type 1 gastric variceal hemorrhage(GOV1)has not been determined.Therefore,the aim of this study was to discover an individualized treatment for mild to moderate GOV1.AIM To compare the efficacy,safety and costs of EBL and TAI for the treatment of mild and moderate GOV1.METHODS A clinical analysis of the data retrieved from patients with mild or moderate GOV1 gastric varices who were treated under endoscopy was also conducted.Patients were allocated to an EBL group or an endoscopic TAI group.The differences in the incidence of varicose relief,operative time,operation success rate,mortality rate within 6 wk,rebleeding rate,6-wk operation-related ulcer healing rate,complication rate and average operation cost were compared between the two groups of patients.RESULTS The total effective rate of the two treatments was similar,but the efficacy of EBL(66.7%)was markedly better than that of TAI(39.2%)(P<0.05).The operation success rate in both groups was 100%,and the 6-wk mortality rate in both groups was 0%.The average operative time(26 min)in the EBL group was significantly shorter than that in the TAI group(46 min)(P<0.01).The rate of delayed postoperative rebleeding in the EBL group was significantly lower than that in the TAI group(11.8%vs 45.1%)(P<0.01).At 6 wk after the operation,the healing rate of operation-related ulcers in the EBL group was 80.4%,which was significantly greater than that in the TAI group(35.3%)(P<0.01).The incidence of postoperative complications in the two groups was similar.The average cost and other related economic factors were greater for the EBL than for the TAI(P<0.01).CONCLUSION For mild to moderate GOV1,patients with EBL had a greater one-time varix eradication rate,a greater 6-wk operation-related ulcer healing rate,a lower delayed rebleeding rate and a lower cost than patients with TAI.