Effect Study of the Recombinant Human Brain Natriuretic Peptide in Patients with Heart Failure Combined with Hypotension

Objective: This paper aims to investigate the effect of applying recombinant human brain natriuretic peptide in patients with heart failure combined with hypotension. Recombinant human brain natriuretic peptide is a synthetic polypeptide drug that is primarily used to treat acute heart failure. Its mechanism of action closely mimics that of human endogenous brain natriuretic peptide. By binding to receptors on cardiomyocytes, it exerts its pharmacological effects. Methods: For the study, 76 heart failure patients with hypotension were selected from our hospital between May 2022 and June 2023. These patients were divided into two groups: a control group and an observation group, each comprising 38 patients. The control group received dopamine treatment, while the observation group was treated with recombinant brain natriuretic peptide. The objective was to compare the effects of the treatments in both groups by analyzing cardiac function indices and levels of vasoactive substances to identify any significant differences in outcomes. Results: The overall response rate of the patients in the observation group and the control group was 94.74% and 73.68%, significantly higher as compared with the observation group (P 0.05). After the following treatment, BNP, ANNP and urine output in the observation group were significantly different compared with the control group, of the statistical significance (P Conclusion: For the treatment of heart failure patients with hypotension, the clinical application of recombinant human brain natriuretic peptide is the most ideal, and significantly improves the cardiac function of patients, which is worth popularizing.

Skin care efficacy study of recombinant humanized collagen based on in vitro level

Studying the skin care efficacy of recombinant humanized collagen based on in vitro level.The stability of the recombinant humanized collagen was first analyzed by treating at different temperatures,then its skincare efficacy based on in vitro level was evaluated by detecting the inhibition rate of elastase,the inhibition rate of collagenase,the protein content of type I collagen in human fibroblasts,the inhibition of reactive oxygen species(ROS)with human keratinocytes,and the effects of the recombinant humanized collagen on the expression of hyaluronic acid(HA),filaggrin(FLG)and transglutaminase 1(TGM1)in keratinocytes.The results showed that recombinant humanized collagen was able to maintain stability at temperatures below 70℃.With regard to its skincare efficacy,recombinant humanized collagen could inhibit elastase and collagenase activities and promote the increase of type I collagen content in human fibroblasts.It also showed good inhibition of ROS in keratinocytes in vitro and could increase the expression of HA,FLG,and TGM1 in keratinocytes.In short,the recombinant humanized collagen exhibited a favourable skin care effect in vitro level.This study proved that it has potential firming,anti-wrinkle,moisturizing,and repairing efficacy,and is a valuable cosmetic raw material.

Recombinant adeno-associated virus 8-mediated inhibition of microRNA let-7a ameliorates sclerosing cholangitis in a clinically relevant mouse model

BACKGROUND Primary sclerosing cholangitis(PSC)is characterized by chronic inflammation and it predisposes to cholangiocarcinoma due to lack of effective treatment options.Recombinant adeno-associated virus(rAAV)provides a promising platform for gene therapy on such kinds of diseases.A microRNA(miRNA)let-7a has been reported to be associated with the progress of PSC but the potential therapeutic implication of inhibition of let-7a on PSC has not been evaluated.AIM To investigate the therapeutic effects of inhibition of a miRNA let-7a transferred by recombinant adeno-associated virus 8(rAAV8)on a xenobiotic-induced mouse model of sclerosing cholangitis.METHODS A xenobiotic-induced mouse model of sclerosing cholangitis was induced by 0.1% 3,5-Diethoxycarbonyl-1,4-Dihydrocollidine(DDC)feeding for 2 wk or 6 wk.A single dose of rAAV8-mediated anti-let-7a-5p sponges or scramble control was injected in vivo into mice onset of DDC feeding.Upon sacrifice,the liver and the serum were collected from each mouse.The hepatobiliary injuries,hepatic inflammation and fibrosis were evaluated.The targets of let-7a-5p and downstream molecule NF-κB were detected using Western blot.RESULTS rAAV8-mediated anti-let-7a-5p sponges can depress the expression of let-7a-5p in mice after DDC feeding for 2 wk or 6 wk.The reduced expression of let-7a-5p can alleviate hepato-biliary injuries indicated by serum markers,and prevent the proliferation of cholangiocytes and biliary fibrosis.Furthermore,inhibition of let-7a mediated by rAAV8 can increase the expression of potential target molecules such as suppressor of cytokine signaling 1 and Dectin1,which consequently inhibit of NF-κB-mediated hepatic inflammation.CONCLUSION Our study demonstrates that a rAAV8 vector designed for liver-specific inhibition of let-7a-5p can potently ameliorate symptoms in a xenobiotic-induced mouse model of sclerosing cholangitis,which provides a possible clinical translation of PSC of human.

Recombinant chitinase-3-like protein 1 alleviates learning and memory impairments via M2 microglia polarization in postoperative cognitive dysfunction mice

Postoperative cognitive dysfunction is a seve re complication of the central nervous system that occurs after anesthesia and surgery,and has received attention for its high incidence and effect on the quality of life of patients.To date,there are no viable treatment options for postoperative cognitive dysfunction.The identification of postoperative cognitive dysfunction hub genes could provide new research directions and therapeutic targets for future research.To identify the signaling mechanisms contributing to postoperative cognitive dysfunction,we first conducted Gene Ontology and Kyoto Encyclopedia of Genes and Genomes pathway enrichment analyses of the Gene Expression Omnibus GSE95426 dataset,which consists of mRNAs and long non-coding RNAs differentially expressed in mouse hippocampus3 days after tibial fracture.The dataset was enriched in genes associated with the biological process"regulation of immune cells,"of which Chill was identified as a hub gene.Therefore,we investigated the contribution of chitinase-3-like protein 1 protein expression changes to postoperative cognitive dysfunction in the mouse model of tibial fractu re surgery.Mice were intraperitoneally injected with vehicle or recombinant chitinase-3-like protein 124 hours post-surgery,and the injection groups were compared with untreated control mice for learning and memory capacities using the Y-maze and fear conditioning tests.In addition,protein expression levels of proinflammatory factors(interleukin-1βand inducible nitric oxide synthase),M2-type macrophage markers(CD206 and arginase-1),and cognition-related proteins(brain-derived neurotropic factor and phosphorylated NMDA receptor subunit NR2B)were measured in hippocampus by western blotting.Treatment with recombinant chitinase-3-like protein 1 prevented surgery-induced cognitive impairment,downregulated interleukin-1βand nducible nitric oxide synthase expression,and upregulated CD206,arginase-1,pNR2B,and brain-derived neurotropic factor expression compared with vehicle treatment.Intraperitoneal administration of the specific ERK inhibitor PD98059 diminished the effects of recombinant chitinase-3-like protein 1.Collectively,our findings suggest that recombinant chitinase-3-like protein 1 ameliorates surgery-induced cognitive decline by attenuating neuroinflammation via M2 microglial polarization in the hippocampus.Therefore,recombinant chitinase-3-like protein1 may have therapeutic potential fo r postoperative cognitive dysfunction.

Efficacy of recombinant human epidermal growth factor plus sodium hyaluronate eye drops in diabetic dry eye post-cataract surgery

BACKGROUND Dry eye syndrome(DES)after diabetic cataract surgery can seriously affect the patient’s quality of life.Therefore,effective alleviation of symptoms in patients with this disease has important clinical significance.AIM To explore the clinical effect of recombinant human epidermal growth factor(rhEGF)plus sodium hyaluronate(SH)eye drops on DES after cataract surgery in patients with diabetes.METHODS We retrospectively evaluated 82 patients with diabetes who experienced DES after cataract surgery at Tianjin Beichen Hospital,Affiliated Hospital of Nankai University between April 2021 and April 2023.They were classified into an observation group(42 cases,rhEGF+SH eye drops)and a control group(40 cases,SH eye drops alone),depending on the different treatment schemes.The therapeutic efficacy,dry eye symptom score,tear film breakup time(TFBUT),basic tear secretion score[assessed using Schirmer I test(SIt)],corneal fluorescein staining(FL)score,tear inflammatory markers,adverse reactions during treat-ment,and treatment satisfaction were compared between the two groups.RESULTS Therapeutic efficacy was higher in the observation group compared with the control group.Both groups showed improved TFBUT and dry eye,as well as improved SIt and FL scores after treatment,with a more pronounced improvement in the observation group.Although no marked differences in adverse reactions were observed between the two groups,treatment satisfaction was higher in the observation group.CONCLUSION rhEGF+SH eye drops rendered clinical benefits to patients by effectively ameliorating dry eye and visual impairment with favorable efficacy,fewer adverse reactions,and high safety levels.Thus,this treatment should be promoted in clinical practice.

Clinical Observation of Recombinant Bovine Basic Fibroblast Growth Factor Eye Gel Combined with Tobramycin Dexamethasone Eye Drops in the Treatment of Dry Eye Syndrome in Patients after Cataract Surgery

Objective:To evaluate the therapeutic effect of recombinant bovine basic fibroblast growth factor(rbFGF)eye gel combined with tobramycin-dexamethasone(TOB-Dex)eye drops on dry eye syndrome(DES)after cataract surgery.Methods:86 patients with DES after cataract surgery,admitted from November 2021 to November 2023,were randomly divided into groups.The observation group included 43 patients treated with rbFGF eye gel combined with TOB-Dex eye drops.The reference group included 43 patients treated with TOB-Dex eye drops alone.Multiple indicators,including total effective rate and clinical symptom scores,were compared between the two groups.Results:The total effective rate in the observation group was higher than in the reference group(P<0.05).Before treatment,there were no differences in clinical symptom scores,serum factors,or disease severity scores between the two groups(P>0.05).Three weeks after treatment,the observation group had lower clinical symptom scores,serum factors,and disease severity scores compared to the reference group(P<0.05).The adverse reaction rate in the observation group was lower than in the reference group(P<0.05).Conclusion:rbFGF eye gel combined with TOB-Dex eye drops can improve the clinical efficacy for patients with DES after cataract surgery,alleviate disease symptoms,reduce inflammatory responses,and have fewer adverse reactions.

Interstitial tissue-specific gene expression in mouse testis by intra-tunica albuguineal injection of recombinant baculovirus

The purpose of this study is to establish a gene delivery system for interstitial tissue-specific protein expression in mice testes using modified recombinant baculovirus. Green fluorescent protein （GFP）-expressing recombinant baculovirus （GFP-baculovirus）, in which the insect cell-specific polyhedron promoter was replaced by the cytomegalovirus （CMV）-IE promoter, was used to transfect testicular cells in vitro, and for intra-tunica albuguineal injection of the interstitial tissue of the testis. GFP expression was monitored in frozen testes sections by fluorescence microscopy. Expression of GFP in testicular tissues was also assessed by reverse transcription polymerase chain reaction （RT-PCR）, and protein expression was assessed by Western blot. Testicular cells in vitro were infected efficiently by modified recombinant GFP-baculovirus. lntra-tunica albuguineal injection of GFP- baculovirus into the mouse testis resulted in a high level of GFP expression in the interstitial tissues. RT-PCR analysis clearly showed GFP gene expression in the testis, particularly interstitial tissues. Intra-tunica albuguineal injection of a modified baculovirus that encoded recombinant rat insulin-like growth factor binding protein （IGFBP）-5 resulted in an increase in IGFBP-5 in testis and semen. In conclusion, we have developed an efficient delivery system for gene expression in vivo in testicular cells, particularly cells of the interstitial tissue using intratunica albuguineal injection of a modified recombinant baculovirus. This method will be particularly relevant for application that requires gene delivery and protein expression in the testicular cells of the outer seminiferous tubule of the testis.

Recombinant expression and purification of functional vascular endothelial growth factor-121 in the baculovirus expression system

Objective: To express human Vascular endothelial growth factor121(VEGF121) in insect cells. Methods: A gene construct containing VEGF was cloned in the p Fast Bac-HTA vector, followed by transformation in DH10 BAC. The recombinant bacmid was then extracted, and transfected into Sf9 insect cells. The transfected cells were harvested, and then VEGF expression was confirmed by Western blotting using specific antibodies. The tube formation assay was used for functional assessment of VEGF. Results: Our results showed that VEGF could be successfully expressed in the baculovirus system. Purified VEGF was able to stimulate in vitro tube formation of human endothelial cells. Conclusions: Results from this study demonstrated that the recombinantly-produced VEGF can be considered as a promising candidate for therapeutic purposes.

High-Level Production of a Functional Recombinant Hepatitis B Virus Polymerase in Insect Cells with a Baculovirus Expression System

HBV polymerase has intrinsic RNA-dependent reverse transcriptase, DNA-dependent DNA polymerase as well as RNaseH activity. Analysis of HBV polymerase has been hampered for many years due to the inability to express functional enzyme in a recombinant system. To obtain ac- tive polymerase at a high level, we have taken advantage of baculovirus expression system. The gene of HBV polymerase was amplified by PCR and cloned into pFastBac Dual to construct the recombi- nant plasmid pFastbac Dual-pol. The recombinant donor plasmid, pFastbac Dual-pol, was constructed by inserting HBV polymerase gene into EcoRI and PstI sites controlled by polyhedrin promoter. The recombinant donor plasmid was transformed into DH10Bac competent cells for transposition. Re- combinant bacmid was constructed by inserting of the mini-Tn7 element from the donor plasmid into the mini-attTn7 attachment site on the bacmid. The recombinant bacmid DNA was isolated and transfected into the Sf9 cells to produce the recombinant virus, and healthy insect Sf9 cells were in- fected with the recombinant virus containing HBV polymerse gene to express the target protein. HBV polymerse expressed in insect cells was analyzed by SDS-PAGE. PCR results showed recombinant donor plasmid, pFastbac Dual-pol, was constructed successfully. The recombinant hepatitis B virus polymerase was expressed in insect cells at high level. The recombinant hepatitis B virus polymerase should facilitate the analysis of HBV polymerase biological characteristics, allow the investigation for new anti-HBV drugs specifically blocking HBV polymerase.

Expression of Recombinant Baculovirus Carrying Schistosoma japonicum 26 ku GST in Mammalian Cells

In order to construct recombinant baculovirus carrying Schistosoma japonicum 26 ku glutathione S-transferase gene （Sj26）, and observe the expression of Sj26 in mammalian cells, the Sj26 gene was amplified with plasmid pGEX-3X as template by PCR, and then recombined into T vector for sequencing. Sj26 gene was inserted into the downstream of CMV promoter of donor plasmid pFBDGC, and the recombinant donor plasmid pFBDGC-Sj26 transformed into DH10Bac, then the recombinant bacmid AcCMVSj26 was isolated and transfected into Sf9 cells, The recombinant baculovirus was harvested and final titer of vAcCMVSj26 was measured. BHK cells were transducted with recombinant baculovirus in vitro, By using Western blot, the expression of 26 ku glutathione S-transferase （GST） was detected. The results showed that after enzyme digestion and sequencing, the donor plasmid was successfully constructed. PCR confirmed that pFBDGC-Sj26 and Bacmid homologous recombination occurred in E. coli. After transfection of Sf9 cells with recombinant Bacmid, recombinant baculovirus was replicated in Sf9 cells and expressed green fluorescent protein. PCR further revealed recombinant baculovirus contained Sj26. The titer of the harvested baculovirus was 1.24×10^8. Western blot demonstrated that recombinant baculovirus could express 26 ku GST in BHK cells, It was concluded that Sj26 recombinant baculovirus was successfully constructed, and the 26 ku GST was expressed in mammalian cells.

Lyophilized recombinant human brain natriuretic peptide: A promising therapy in patients with chronic heart failure

Lyophilized recombinant brain natriuretic peptide(BNP)is an exogenous peptide synthesized by artificial recombination technology,with a similar structure and similar physiological effects with the endogenous natriuretic peptide secreted by the human body.It’s main mechanism of action is to increase cyclic guanosine monophosphate by binding with its corresponding receptor in the body,regulating,thus,the imbalance of the vascular system and cardiac hemodynamics,improving the heart’s pumping capacity,and inhibiting sympathetic excitability and myocardial remodeling.Moreover,it can promote mitochondrial metabolism and enhance the use of adenosine triphosphate in cardiomyocytes.In the present study,102 chronic heart failure(HF)patients were randomly assigned to a control and an observation group consisting of 51 patients each.Patients of the control group were treated with standard HF therapy for 3 d including oral metoprolol tartrate tablets,spironolactone,and olmesartanate while patients of the observation group were administered the recombinant human BNP injection for the same time-period,plus the standard HF therapy.The recombinant human BNP group(observation group)demonstrated better physical,emotional,social,and economic scores,as well as cardiac and inflammatory biomarkers such as serum hypersensitive C-reactive protein,N-terminal pro BNP and troponin I levels,compared to the control group.Moreover,cardiac function was also improved,as left ventricular ejection fraction and stroke volume were significantly higher in the observation group than in the control group.Interestingly,adverse reactions were not different between the 2 groups.However,these results are not generalizable and the need of large multicenter randomized controlled trials examining the safety and efficacy of recombinant human BNP in HF patients is of major importance.

Lyophilized recombinant human brain natriuretic peptide for chronic heart failure:Effects on cardiac function and inflammation

BACKGROUND Chronic heart failure(CHF)is a serious and prevalent condition characterized by impaired cardiac function and inflammation.Standard therapy for CHF has limitations,prompting the exploration of alternative treatments.Recombinant human brain natriuretic peptide(BNP)has emerged as a potential therapy,with evidence suggesting that it can improve cardiac function and reduce inflammation in patients with CHF.However,further research is required to determine the efficacy and safety of lyophilized recombinant human BNP in CHF patients and its impact on microinflammatory status.This study aimed to investigate the effects of lyophilized recombinant human BNP therapy on CHF patients’cardiac function and microinflammatory status.AIM To investigate the effects of freeze-dried recombinant human BNP therapy on cardiac function and microinflammatory status in patients with CHF.METHODS In total,102 CHF patients admitted to our hospital from January 2021 to January 2022 were randomly assigned to control and observation groups(n=51 patients/group).The control patients were treated with standard HF therapy for 3 d,whereas the observational patients were injected with the recombinant human BNP for 3 d.Clinical efficacy,inflammatory factor levels,myocardial damage,cardiac function before and after the treatment,and adverse reactions during treatment were compared between the two groups.RESULTS The overall clinical efficacy was higher in the observation group than in the control group.Compared with baseline,serum hypersensitive C-reactive protein,N-terminal proBNP,and troponin I level,and physical,emotional,social,and economic scores were lower in both groups after treatment,with greater reductions in levels and scores noted in the observation group than in the control group.The overall incidence of adverse reactions in the observation group was not significantly different compared with that in the control group(P>0.05).CONCLUSION Freeze-dried recombinant human BNP therapy can improve heart function and enhance microinflammatory status,thereby improving overall quality of life without any obvious side effects.This therapy is safe and reliable.

Clinical observation of recombinant human nerve growth factor in the treatment of neurotrophic keratitis

AIM:To characterize changes of corneal nerve morphology and tear indices in patients with neurotrophic keratitis(NK)treated with recombinant human nerve growth factor(rhNGF).METHODS:In a prospective observational study,six patients(nine eyes)were locally treated with rhNGF.Visual acuity,corneal fluorescein staining score,the heights of the tear river,lipid layer thickness(LLT),tear ferning(TF)test,conjunctival impression cytology(CIC)examination,the densities of cornea subbasal nerve fibers were determined before and after treatment.RESULTS:Compared with baseline,there was a significant difference in corneal fluorescence staining scores(P<0.01);all patient corneal epithelial defects recovered completely within 8wk,but there was no significant improvement in the height of the tear river(P=0.202).LLT was significantly increased when compared with baseline(P=0.042);however,the function of conjunctival goblet cells and mucin content did not significantly improve using the TF test and CIC examination(P=0.557,P=0.539).After 8wk of treatment,the average corneal subbasal nerve fiber density increased significantly(P<0.01),as did the number of corneal nerve fiber branches(P=0.001).CONCLUSION:RhNGF can increase the density of corneal subbasal nerve fibers,promote the healing of persistent corneal epithelial defects and corneal ulcers in patients with NK,also improving tear function partially.

Construction of Recombinant Baculovirus Containing Peste des Petits Ruminants Virus N Gene and Establishment of Indirect ELISA for Detecting Serum Antibodies

This experiment was conducted to diagnose Peste des Petits Ruminants based on the eukaryotically-expressed PPRV nucleoprotein through an indirect ELISA. The full-length PPRV nucleoprotein gene was obtained from viral genome RNA by RT-PCR. The amplified fragments were cloned into baculovirus donor vectors pFastHTA of the Bac-to-Bac system. These recombinant plasmids, pFastHTA-PPRV-N, were transformed into DH10Bac host bacteria to obtain recombinant shuttle plasmids, pBacmid-PPRV-N. Recombinant baculovirus, Bacmid-PPRV-N, was generated for expression of the PPRV nucleoprotein by transfecting recombinant pBacmid-PPRV-N with Lipofectamine 2000 into Sf21 insect cells. The efficient expression of PPRV Nucleoprotein by baculovirus in Sf21 cells was verified by SDS-PAGE and Western blot. An indirect ELISA was developed using recombinant PPRV nucleoprotein as the coating antigen. 37 goat sera from an epidemic area in Tibet and 92 goat sera from a non-infected area in Qinghai Province were simultaneously detected by the indirect ELISA, developed here, and the international standard cELISA kit. The sensitivity and specificity of the indirect ELISA was 100% and 96.2% compared with the cELISA kit. The coincidence rate of the two methods was 96.9%. The results demonstrated that the indirect ELISA established in this study works well for diagnosis of PPR.

Expression and Evaluation of Wb-SXP-1 and Wb-123 Recombinant Antigens as Potential Diagnostic Biomarkers for Lymphatic Filariasis

Lymphatic filariasis (LF) remains a public health concern as it can cause permanent morbidity and disability to those infected. While the global elimination of LF in these endemic areas is ongoing through mass drug administration, there is the need to develop diagnostic tools that would be utilized to track the progress of total global eradication as well as perform surveillance for the recurrence of lymphatic filariasis transmission. Currently, approved LF diagnosis tools are faced with lack of specificity, low sensitivity, and periodicity dependence. Recombinant filarial antigen-based assays can address these drawbacks and offer practical instruments for LF diagnosis and surveillance. This present study, evaluated rWb-SXP-1 and rWb-123 antigens as potential diagnostic biomarker tools for Wuchereria banchrofti in human sera using microspheres-based multiplex serological assay. Based on statistical analysis using XLSTAT 2019 (Addinsoft) on data generated from multiplex technology assay, generated ROC curves for both rWb-SXP-1 and rWb-123 demonstrated 87.1% sensitivity to Wuchereria banchrofti human sera with rWb-SXP-1 antigens having the highest specificity of 96%. Indication that rWb-SXP-1 and rWb-123 antigens are capable of detecting immunoglobulin G4 (IgG4) antibodies in human sera synthesized specifically against W. banchrofti infections. Therefore, rWb-SXP-1 and rWb-123 antigens can be utilized to detect W. banchrofti infections by antibody profiling with excellent diagnostic sensitivity and specificity using microsphere-based multiplex serological tests. This method can be particularly practical for screening a large number of sera samples and/or for quick, extensive field-testing due to the high-throughput and quick formats applied.

Tensile Properties and Prediction Model of Recombinant Bamboo at Different Temperatures

The destruction of recombinant bamboo depends on many factors,and the complex ambient temperature is an important factor affecting its basic mechanical properties.To investigate the failure mechanism and stress–strain relationship of recombinant bamboo at different temperatures,eighteen tensile specimens of recombinant bamboo were tested.The results showed that with increasing ambient temperature,the typical failure modes of recombinant bamboo were flush fracture,toothed failure,and serrated failure.The ultimate tensile strength,ultimate strain and elastic modulus of recombinant bamboo decreased with increasing temperature,and the ultimate tensile stress decreased from 154.07 to 96.55 MPa,a decrease of 37.33%,and the ultimate strain decreased from 0.011 to 0.008,a decrease of 26.57%.Based on the Ramberg-Osgood model and the pseudo‒elastic design method,a predictive model was established for the tensile stress–strain relationship of recombinant bamboo considering the temperature level.The model can accurately evaluate the tensile stress–strain relationship of recombinant bamboo under different temperature conditions.

密码子优化的RHDV2双VP60基因重组杆状病毒构建及表达蛋白免疫原性分析

[目的]试验旨在优化兔出血症病毒2型(Rabbit hemorrhagic disease virus 2,RHDV2)病毒样颗粒(virus-like particle, VLP)疫苗的制备策略,探究RHDV2 VLP疫苗对家兔的免疫原性,为低成本、高产量RHDV2新型疫苗研发提供新思路。[方法]根据昆虫细胞的密码子偏好性优化合成RHDV2 VP60全基因,将双VP60基因插入真核载体pFastBacTMDual,转化携带Bacmid质粒的大肠杆菌DH10Bac感受态细胞,构建含双VP60基因的重组杆粒Bacmid-VP60-VP60,转染Sf9昆虫细胞,通过Western blotting、间接免疫荧光试验(IFA)及透射电镜对重组杆状病毒Bacmid-VP60-VP60进行表达验证;将优化策略制备的重组蛋白抗原与氢氧化铝佐剂按照9∶1比例制备VLP灭活疫苗,通过安全性检验、最小免疫剂量、免疫持续期等评估优化策略制备的RHDV2 VLP疫苗的保护效果。[结果]试验成功构建重组杆粒Bacmid-VP60-VP60。Western blotting鉴定结果显示,重组杆状病毒转染Sf9细胞表达出大小约60 ku的RHDV2 VP60蛋白。IFA鉴定结果显示,感染重组杆状病毒的Sf9细胞产生了大量的黄绿色荧光,表明重组杆状病毒在Sf9细胞中大量表达VP60蛋白。透射电镜观察结果显示,VP60蛋白折叠成VLP,大小为40 nm左右,呈现球形结构,表面光滑。优化策略制备的RHDV2 VLP疫苗对家兔具有良好的安全性和免疫原性,最小免疫剂量为0.5 mL/只,免疫持续期可达210 d以上。[结论]试验构建了含有密码子优化的双VP60基因的重组杆状病毒,并在昆虫细胞中成功表达RHDV2 VP60蛋白,该蛋白制备的VLP疫苗对家兔具有良好的免疫原性。

钙钛矿太阳能电池材料缺陷对器件性能与稳定性的影响

基于钙钛矿太阳能电池材料独特的光电特性,特别是光电转换效率在初期短时间内的快速提升,使其成为当前光伏领域中最富吸引力的光吸收材料之一.然而,近年来转换效率的增长步入缓慢阶段,同时材料的长期稳定性也成为商业化应用的关键挑战,这些问题背后的物理机制与材料缺陷密切相关.为进一步提高电池效率和结构稳定性,必须深刻理解和精准地掌握这些缺陷的特性.本文全面回顾了钙钛矿材料中各类缺陷对光伏性能和稳定性的影响,包括传统刚性模型缺陷、非常规性缺陷、复合型缺陷、离子迁移和缺陷对载流子寿命的影响,论述了缺陷与材料结构稳定性之间的紧密关联性,并对未来关于缺陷的研究方向进行了展望.

对比罗沙司他与重组人促红细胞生成素对维持性血液透析患者冠状动脉钙化的影响

目的对比罗沙司他与重组人促红细胞生成素(rHuEPO)对维持性血液透析(MHD)患者冠状动脉钙化的影响。方法采用回顾性分析的方法,选取重庆医科大学附属第一医院血液净化中心2019年4月至2021年6月处方中含罗沙司他的56例MHD患者作为ROX组,同期处方中含rHuEPO的60例MHD患者作为EPO组,随访观察12个月,比较两组患者治疗前后实验室检查指标、冠状动脉钙化积分(CACS)、心脏超声参数的差异及随访期间心脑血管事件发生情况。结果治疗前及治疗后两组患者的CACS比较,差异均无统计学意义(P>0.05);但ROX组患者治疗前后的CACS差值明显低于EPO组患者(P<0.05)。两组患者治疗前后心脏超声参数及实验室检查指标比较,差异均无统计学意义(P>0.05)。随访期间,ROX组患者的脑卒中和心肌梗死发生率显著低于EPO组(P<0.05),但两组间因心衰住院的发生率差异无统计学意义(P>0.05)。结论与rHuEPO比较,罗沙司他可能对延缓MHD患者冠状动脉钙化有积极作用,且可能有利于减少MHD患者心肌梗死、脑卒中的发生。

Overview of Recombinant Skin Models and Progress in Their Application in Vitro Assessment of Toxicity and Efficacy

A recombinant skin model is a model in which skin cells are grown in vitro on a bioactive scaffold and provided with adequate nutrition to promote cell proliferation and differentiation to produce a mock skin structure and biological features. The development of recombinant skin models allows for effective and scientifically sound in vitro evaluation tests. This review briefly summarizes the overview of recombinant skin models and the progress of their application in in vitro evaluation which focuses on three aspects: skin irritation, skin corrosivity, and anti-skin aging. Moreover, an outlook on the future development of recombinant skin models is also provided in this review.