Anti-fungal and anti-bacterial activities of ethanol extracts of selected traditional Chinese medicinal herbs

Objective:To evaluate in ritro antimicrobial activities of selected 58 ethno-medicinal plant extracts with a view to assess their therapeutic potential.Methods:A total of 58 traditional Chinese medicinal plants were carefully selected based on the literature review and their traditional use.The antimicrobial activities of ethanol extracts of these medicinal plants were tested against fungi(Aspergillus funigaius),yeast(Candida albicans),gram-negative(Acirelobacter haumannii and Pseudornnruis aeruginosa)and gram-positive bacteria(Staphglococcus aureus).The activities were tested at three different concentrations of 1.00,0.10 and 0.01 mg/mL.The data was analysed using Gene data Screener program.Results:The measured antimicrobial activities indicated that out of the 58 plant extracts,15 extracts showed anti-fungal activity and 23 extracts exhibited anti-bacterial activity.Eight plant extracts have exhibited both anti-bacterial and anti-fungal activities.For instance,Eucommia ulmoides,Pohgonum cuspidcrtum,Poria cocas and Uncaria rhineophylla showed activity against both bacterial and fungal strains,indicating their broad spectrum of activity.Conclusions:The results revealed that the ethanol extracts of 30 plants out of the selected 58 possess significant antimicrobial activities.It is interesting to note that the findings from the current study are consistent with the traditional use.A clear correlation has also been found between the antimicrobial activity and the flavonoid content of the plant extracts which is in agreement with the literature.Hence.the results presented here can be used to guide the selection of potential plant species for the isolation and structure elucidation of novel antimicrobial compounds in order to establish the structure-activity relationship.This in turn is expected to lead the way to the discovery of novel antimicrobial agents for therapeutic use.

Phytochemical and anti-bacterial activity of epidermal glands extract of Christella parasitica (L.) H. Lev.

Objective:To study the morphology,biochemistry and bioactivity of the epidermal glands of the glandular morphotype of Christella parasitica(C.parasitica)(L.) H.Lev.Methods: Morphological studies on epidermal glands were earned out by using light microscope and scanning electron microscope.To prepare the extract,the shade-dried fronds of glandular morphotype were soaked in acetone.For antibacterial studies paper disc method was followed by using various pathogenic bacteria.Results:Detailed micromorphological,phytochemical and bioactivity studies on a medicinal fern C.parasitica(L.) H.Lev.showed its inlraspecific variation in antibacterial activity.The presence or absence of the epidermal glands was the key factor for antibacterial activity in the morphovariants of this species.The epidermal glands were orange-coloured,stalked and elongated ones of about 84.2μm×45μm,and distributed on the undersurface of cosla,coslules and veins in croziers,young and mature leaves.Frequency of glands varied from 15/cm on costa in mature leaves to 140/cm on costules in croziers.The acetone extract of the glands showed antibacterial activities and also toxic effect against mosquito larvae and tadpoles of frog.Preliminary phytochemical analysis and HPLC studies of the gland extract showed the presence of various kinds of terpenoids,alkaloids,tannins,saponins and flavonoids in it.Conclusions:The present study shows that epidermal glands of the glandular morphotype of C. parasitica(L.) H.Lev.have several bioactive compounds and such rare moiphovariant should be conserved in nature.The next step is to isolate the pure compounds and to screen the bioactivity of individual compounds of the epidermal glands.

Anti-bacterial studies on Hemigraphis colorata(Blume) H.G.Hallier and Elephantopus scaber L.

Objective:To examine the ethanol,aqueous,chloroform,benzene,acetone and petroleum ether extracts of Hemigraphis colorata(H.colorata) leaves and stem and Elephantopus scaber (E.scaber) leaves,root and flower for the presence of phyto-constituents and screened the antibacterial activity against the selected pathogens.Methods:The fresh materials were shade dried and powdered using the tissue blender.The dried and powered materials(50 g) were extracted successively with 200 mL of aqueous,acetone,benzene,chloroform,etganol.and petroleum ether by using Soxhlet extractor for 8 h at a temperature not exceeding the boiling point of the solvent.Aqueous,acetone,benzene,chloroform,ethanol.and petroleum ether extracts were prepared from powdered materials were used for preliminary phytnehemical and antimicrobial studies using standard methods.Results:The crude aqueous,acetone,benzene,chloroform, ethauol.and petroleum ether extracts E.scaber leaves,flower and root and H.colorata leaves and stem demonstrated that out of(5×6×12 = 360) tests for the presence or absence of the above compounds.188 tests gave positive results and the remaining 172 gave negative results. The results of the phvtochemical screening revealed that phenol(12/12).carbohydrates(9/12). steroids(8/12).saponins and coumarins(7/12).tannins(6/12),proteins(5/12).earboxylic acid and flavonoids(4/12).xanthoproteins(3/12) and alkaloids(2/12) presence in the crude aqueous, acetone,benzene,chloroform,ethanol.and petroleum ether extracts of H.colorata leaves and stem.The crude aqueous,acetone,benzene,chloroform,ethanol.and petroleum ether extracts E.scaber leaves,flower and root displayed the presence of phenol(18/18).tannin(17/18). carbohydrates(16/18).steroids(14/18),oarboxylic acid and coumarins(12/18).saponins(10/18), xanthoprotein(9/18).flavonoids(7/18).protein(4/18) and alkaloids(2/18).The root ethanolic extracts of E.scaber illustrated the highest zone of inhibition against three pathogens viz.. Staphylococcus aureus(S.aureus)(24 mm).Escherichia coli(E.coli)(16 mm) and Psemlomonas aeruginosa {P.aeruginosa)(13 mm).The chlorofrom extracts of E.scaber showed the highest zone of inhibition against Bacillus cereus(B.ceretus)(12 mm).The leaves ethanolic extracts of E.scaber demonstrated the highest zone of inhibition against three pathogens viz.,Enterococcus faecalis (E.faecalis)(18 mm).Proteus mirabilis(P.mirabilis)(17 mm).Salmonella Typhi(S.typhi)(14 mm) and Enterobacter sp.(11 mm) While the benzene extracts of H.colorata demonstrated maximum zone of inhibition against the pathogen Acinetobucter sp.(14 mm) and S.aureus (12 mm).Conclusions:It is hoped that this study would direct to the establishment of some compounds that could be used to invent new and more potent antimicrobial drugs of natural origin.

Effect of K1, K2 Anti-Bacterial Agents on Tobacco Ralstonia Solanacearum

The tobacco Ralstonia Solanacearum were both cultured on nutrient agar plates and inoculated in seedling stage of tobacco, then treated with K1 and K2, two anti-bacterial agents, at a serial con-centrations to study their inhibitory efficiency. The result indicated that K1 can inhibit R. Solanacearum growth entirely, at the concentration range from 1/50 to 1/5000. K2 can reach the same result at the concentration range from 1/50 to 1/50000. Compared with the control plates, K1, at the concentration 1/50000, had no significant differences, and the average number of colony per plate was 112-115. The immature tobacco shown wilt as soon as inoculated with R. Solanacearum, and recovered gradually after using K1, K2. The densities of microbial suspension, handled by K1, K2 within 10 hs, were both significantly lower than the controlled ones. The optical microscopy also shown that handled microbial body differed from the controlled, whose body was regular short, rod shape as opposed to the handled ones with irregular rod shape and damaged body. All the results indicated that K1 and K2 both had inhibitory effects on tobacco R. Solanacearum, and K2 was more efficient than K1.

In vitro anti-biofilm and anti-bacterial activity of Junceella juncea for its biomedical application

Objective:To investigate the anti-biofilm and anti-bacterial activity of Junceella juncea(J.juncea)against biofilm forming pathogenic strains.Methods:Gorgonians were extraeted with methanol and analysed with fourier transform infrared spectroscopy.Biofilm forming pathogens were identified by Congo red agar supplemented with sucrose.A quantitative spectrophotometric method was used to monitor in vitro biofilm reduction by microtitre plate assay.Anti-bacterial activity of methanolic gorgonian extract(MGE)was carried out by disc diffusion method followed by calculating the percentage of increase with crude methanol(CM).Results:The presence of active functional group was exemplified by FT-IR spectroscopy.Dry,black,crystalline colonies confirm the production of extracellular polymeric substances responsible for biofilm formation in Congo red agar.MGE exhibited potential anti-biofilm activity against all tested bacterial strains.The anti-bacterial activity of methanolic extract was comparably higher in Salmonella typhii followed by Escherichia colt,Vibrio cholerae and Shigella flexneri.The overall percentage of increase was higher by 50.2%to CM.Conclusions:To conclude,anti-biofilm and anti-bacterial efficacy of J.juncea is impressive over biofilm producing pathogens and are good source for novel anti-bacterial compounds.

Design,synthesis and bioevaluation of N-hydroxyquinolinones as potential anti-plasmodial,anti-bacterial and iron(Ⅱ)-chelating agents

OBJECTIVE To establish a small compound library via a versatile synthetic route for the investigation of natural-inspiring compounds containing N-hydroxypyridones motif as potential anti-plasmodial,anti-bacterial and iron(Ⅱ)-chelating agents.METHODS An amidation/cyclization approach was adopted to synthesize a library of N-hydroxyquinolinones.The anti-plasmodial susceptibility of lab clone 3D7 P.falciparum was measured using aprotocol modified from the WHO microtest.The minimum bactericidal concentration(MBC)values were determined against Escherichia coli and Staphylococcus arueus.Nine compounds were selected to test their iron(Ⅱ)-chelating abilities.The iron(Ⅱ)-chelating ability was determined by measuring the absorbance of ferrozine-iron complex at 562 nm.RESULTS A new route for the facile synthesis of a library of N-hydroxyquinolinones based on one-pot palladium catalyzed C-N amidation/dehydrocyclizationsequence was implemented.Four compounds show anti-plasmodial activities with the range of 1.1-1.4μmol·L-1,50% chelation abilities of the nine selected compounds were shown to be 0.24-0.29mmol·L-1.CONCLUSION Alibrary of N-hydroxyquinolinones was synthesized via a novel synthetic route.The anti-plasmodial and anti-bacterial activities of these compounds were evaluated.Four compounds show potent anti-plasmodial activities Nine compounds were examined for their propensities to undergo iron chelation and these compounds were shown to be promising iron(Ⅱ)chelators as compared to EDTA.

Biocompatible silver nanoparticles: An investigation into their protein binding efficacies, anti-bacterial effects and cell cytotoxicity studies

Green synthesis of silver nanoparticles(AgNPs)has garnered tremendous interest as conventional methods include the use and production of toxic chemicals,products,by-products and reagents.In this regard,the synthesis of AgNPs using green tea(GT)extract and two of its components,(-)-epigallocatechin gallate(EGCG)and(+)-catechin(Ct)as capping/stabilizing agents,is reported.The synthesized AgNPs showed antibacterial activity against the bacterial strains Staphylococcus aureus and Escherichia coli,along with anticancer activity against HeLa cells.After administering nanoparticles to the body,they come in contact with proteins and results in the formation of a protein corona;hence we studied the interactions of these biocompatible AgNPs with hen egg white lysozyme(HEWL)as a carrier protein.Static quenching mechanism was accountable for the quenching of HEWL fluorescence by the AgNPs.The binding constant(Kb)was found to be higher for EGCG-AgNPs((2.309±0.018)×104 M-1)than for GT-AgNPs and Ct-AgNPs towards HEWL.EGCG-AgNPs increased the polarity near the binding site while Ct-AgNPs caused the opposite effect,but GT-AgNPs had no such observable effects.Circular dichroism studies indicated that the AgNPs had no such appreciable impact on the secondary structure of HEWL.The key findings of this research included the synthesis of AgNPs using GT extract and its constituent polyphenols,and showed significant antibacterial,anticancer and protein-binding properties.The-OH groups of the polyphenols drive the in situ capping/stabilization of the AgNPs during synthesis,which might offer new opportunities having implications for nanomedicine and nanodiagnostics.

Cranberry cultivated in China:UPLC-Q-TOF-MS analysis of its acidic ethanol extract and assessment of its anti-bacterial and anti-tumor activities in vitro

Cranberry,the fruit of Vaccinium macrocarpon Aiton,is becoming popular all over the world,due to its pleasant taste,nutraceutical value and biological activities.For a long time,98%of its yield has been from America.Since being introduced to China as an import in recent decades,cranberry has become a rapid success in the food industry even with the high transportation cost.Recently,V.macrocarpon was cultivated in the Northeast of China,and the area of cultivation has increased dramatically.Therefore,it is important to systematically determine the useful compounds and their activity in this“Made-in-China”cranberry.In the present study,the content of total phenolics,anthocyanins,proanthocyanidins,sugars and organic acids was determined.Our results demonstrated that domestic cranberry is a rich source of phenolics,anthocyanins,proanthocyanidins,sugars and organic acids.Analysis of the chemical composition of an acidic ethanol extract by UPLC-QTOF-MS identified 21 compounds as well as the contents determination of catechin and cyanidin-3-O-glucoside using RPHPLC.Furthermore,cranberry extract was tested for its anti-bacterial activity against five clinically important pathogens,as well as its inhibitory effect on the proliferation and migration of cancer cells in vitro.Our results demonstrated that cranberry produced in Chinese cultivation areas is a rich source of bioactive compounds and exhibited in vitro anti-microbial and anti-tumor activities.Our work provides essential information about the quality of domestic cranberry and facilitates the development of related industries.

Surface Anti-bacterial Adhesion Characteristics of TiO_2-coated PMMA

The anti-bacterial adhesion properties of TiO2-coated polymethyl methacrylate （PMMA） surfaces are investigated systematically. In detail, the adhesion of S. aureus （gram positive） and E. coli （gram negative） to TiO2-coated and uncoated PMMA surfaces are performed by the plate counting method. Afterwards, the adhesion free energy of bacteria on both supporting materials is quantified using the thermodynamic approach of Lifshitz van der Waals and acid/base interactions. The superior anti-adhesion capability of TiO2-coated PMMA is demonstrated when compared to native PMMA, both experimentally and theoretically.

Anti-Bacterial and Flame Retardant for Cotton Fabric by One-Bath Finishing

A research on the process of cotton fabric flame-re-tarding,anti-bacterial finishing and one-bath finish-ing of anti-bacterial and flame-retarding is discussed.The flame retardant agent was phosphorous-contained,and the bacteriostatic finishing agent named SFR-1 wassynthesized.The flame retardancy of the fabric finishedcan meet the DOC FF3-71 Children Sleepwear Stan-dard.Its bacterial inhibiting capacity can meet and ex-ceed the requirements of similar products

An anti-bacterial porous shape memory self-adaptive stiffened polymer for alveolar bone regeneration after tooth extraction

The regeneration of alveolar bone after tooth extraction is critical for the placement of dental implants.Developing a rigid porous scaffold with defect shape adaptability is of great importance but challenging for alveolar bone regeneration.Herein,we design and synthesize a biocompatible poly(L-glutamic acid)-g-poly(ε-caprolactone)(PLGA-g-PCL)porous shape memory(SM)polymer.The PLGA-g-PCL is then copolymerized with acryloyl chloride grafted poly(ω-pentadecalactone)(PPDLDA)having a higher phase transition temperature than shape recovery temperature to maintain stiffness after shape recovery to resist chewing force.The hybrid pol-ydopamine/silver/hydroxyapatite(PDA/Ag/HA)is coated to the surface of(PLGA-g-PCL)-PPDL scaffold to afford the anti-bacterial activity.The porous SM scaffold can be deformed into a compact size and administered into the socket cavity in a minimally invasive mode,and recover its original shape with a high stiffness at body tem-perature,fitting well in the socket defect.The SM scaffold exhibits robust antibacterial activity against Staphy-lococcus aureus(S.aureus).The porous microstructure and cytocompatibility of PLGA allow for the ingrowth and proliferation of stem cells,thus facilitating osteogenic differentiation.The micro-CT and histological analyses demonstrate that the scaffold boosts efficient new bone regeneration in the socket of rabbit mandibular first premolar.This porous shape memory self-adaptive stiffened polymer opens up a new avenue for alveolar bone regeneration.

Bifunctional Two-Dimensional Nanocomposite with Electromagnetic Wave Absorption and Anti-bacterial Performance

In current electronic information era,the complex application circumstance of 5G devices pursues the exploration of multi-functional electromagnetic wave(EMW)absorbent materials and it has become the crucial focus in industrial development.A two-dimensional(2D)graphite nanosheet decorated by nickel nanocapsules(2D graphite/Ni@C nanocomposite)was fabricated to possess the EMW absorption and the Escherichia coli(E.coli)anti-bacterial performance simultaneously.By adjusting the filling ratio and injecting nitrogen doping,the value of minimum reflection loss is−36.08 dB and the effective absorption bandwidth reaches to 5.12 GHz(from 11.4 to 16.52 GHz)with the mass ratio of 30 wt%and the absorber thickness of 2 mm.This 2D nanocomposite simultaneously gets an excellent anti-bacterial function expressing an E.coli anti-bacterial rate of 92%during 24 h which is significantly correlated to the interaction between the nanostructure of the 2D nanographite and the nickel ion released from Ni@C nanocapsules.This work provides a new approach to develop a promising 2D anti-bacterial EMW absorber.

复方红藤糖浆联合抗菌药物治疗盆腔炎性疾病的效果

目的探讨复方红藤糖浆联合抗菌药物治疗盆腔炎性疾病(PID)患者的效果及安全性。方法选取2018年1月至2021年12月安徽中医药大学第一附属医院妇科收治入院的60例PID患者为研究对象,按随机数字表法分为研究组和对照组,各30例。2组采用盐酸头孢替安联合奥硝唑氯化钠注射液静脉输注治疗,研究组同时予复方红藤糖浆口服,2组均治疗1周。比较2组患者临床疗效、疼痛视觉模拟评分(VAS)、盆腔痛客观体征(McCormack)评分、下腹疼痛、腰骶疼痛、带下异常、乏力中医症候积分、白细胞计数(WBC)、超敏C反应蛋白(hs-CRP)、白细胞介素(IL)-10、肿瘤坏死因子(TNF)-α。结果治疗后,研究组及对照组的总有效率分别为93.33%及73.33%;研究组总有效率高于对照组,差异有统计学意义(P<0.05)。与治疗前相比较,2组治疗后VAS评分、McCormack评分、下腹疼痛积分、腰骶疼痛积分、带下异常积分、乏力积分、WBC、hs-CRP、TNF-α降低,IL-10升高(P均<0.01)。与对照组治疗后相比较,研究组治疗后VAS评分、McCormack评分、下腹疼痛积分、腰骶疼痛积分、带下异常积分、乏力积分、WBC、hs-CRP、TNF-α降低,IL-10升高(P均<0.05)。结论复方红藤糖浆联合抗菌药物可改善湿热蕴结证盆腔炎患者临床症状,疗效明显。

噬菌体抗细菌生物膜机制及应用策略的研究进展

细菌生物膜(bacterial biofilms,BF)是细菌在生物或非生物表面所形成的复杂微生物群落,其形成显著增强了细菌毒力和耐药性,与高比例的慢性细菌感染相关,对人类健康造成严重威胁。传统抗生素和常用消毒剂在清除生物膜方面的能力有限,迫切需要一种有效的新策略治疗细菌生物膜。噬菌体(bacteriophage,phage)作为一类能感染并裂解细菌的病毒,具有较高的安全性和特异度,被认为是治疗细菌生物膜有前景的替代方法。该文综述了噬菌体抗细菌生物膜的作用机制、基于噬菌体及其衍生物在防控细菌生物膜形成的应用策略,为开发高效的噬菌体抗细菌生物膜方法提供新思路。

耐药菌的环境分布、传播及新型抗菌技术研究进展

抗生素的广泛使用导致细菌耐药性增加、多重耐药菌菌群数量急剧增多,严重威胁着人类生命健康.环境中耐药菌(ARB)及耐药基因(ARGs)的存在给临床治疗耐药菌感染带来了巨大挑战.有关医院中常见耐药致病菌的研究已有很多,尚缺乏环境中耐药菌的分布、传播及新型耐药菌抗菌技术等的相关研究.本文综述了耐药菌的环境分布特征及其传播机制,概述了新型抗菌技术及其应用,最后展望了有关环境耐药菌研究的未来发展方向.

微弧氧化对金属植入物抗菌和抗炎能力的调节效应

背景:微弧氧化技术能够有效地将生物活性元素掺杂到金属表面,提高生物医用金属材料的抗菌性能和抗炎性能,因此该技术已成为生物医用材料的研究热点之一。目的:重点介绍微弧氧化技术及其与其他表面改性技术联合应用制备植入物表面涂层的抗菌性能和抗炎性能。方法:以“微弧氧化,抗炎性能,抗菌性能,金属植入物”为中文检索词检索中国知网和万方数据库,以“micro-arc oxidation、antibacterial properties,anti-inflammatory properties,metal implants”为英文检索词检索PubMed数据库,检索时间范围为1996年1月至2022年12月,根据纳入和排除标准初筛后,最后保留89篇文献进行归纳总结。结果与结论:微弧氧化陶瓷层提高了钛、镁等合金的抗菌性能和抗炎性能,联合其他表面改性技术有效解决了孔隙对合金表面性能的影响,进一步提高了氧化膜的生物学性能,在骨科和牙科等领域有着广泛的应用前景。目前研究多局限于金属涂层,而且大部分研究集中在银、铜等具有良好抗菌性能的金属元素,仅有少数研究提到氧化石墨烯、羟基磷灰石和壳聚糖等非金属涂层,未来可以对无机物涂层和高分子涂层进行广泛研究,也可采取更多种不同生物活性元素的组合来提高抗菌性能。目前微弧氧化技术所制备的植入体涂层炎症研究多局限于免疫系统,且集中在巨噬细胞,而其对于中性粒细胞、血小板等的研究稀缺,未来需联合应用多种先进技术手段探究微弧氧化涂层对其他免疫细胞和炎症细胞的具体影响。

夫西地酸对分枝杆菌的体外抑菌效果评价

目的:评价夫西地酸(fusidic acid,FA)对分枝杆菌的体外抑菌效果。方法:选取首都医科大学附属北京胸科医院菌株库保存的分枝杆菌标准菌株和临床分离株作为研究菌株,其中,分枝杆菌标准菌株共计45株,包括26株快速生长型分枝杆菌(rapidly growing mycobacteria,RGM)菌株和19株缓慢生长型分枝杆菌(slowly growing mycobacteria,SGM)菌株;分枝杆菌临床分离株共计129株,为首都医科大学附属北京胸科医院2017年1月至2018年12月分离获得,包括结核分枝杆菌(Mycobacterium tuberculosis,MTB)药物敏感株26株、耐多药(multidrug-resistant,MDR)MTB菌株29株、广泛耐药(extensive drug-resistant,XDR)MTB菌株30株、鸟分枝杆菌分离株23株和戈登分枝杆菌分离株21株。采用肉汤稀释法药物敏感性试验,测定FA对研究菌株的最低抑菌浓度(minimum inhibitory concentration,MIC)、MIC_(50)、MIC_(90)、MIC_(99),并将MIC≤16μg/ml的菌株定义为FA敏感株,分析菌株对FA的耐药情况。结果:RGM和SGM标准菌株对FA的耐药率分别为23.1%(6/26)和21.1%(4/19)。FA对MDR-MTB临床分离株的MIC_(50)、MIC_(90)、MIC_(99)分别是4、16、16μg/ml,MTB临床分离株对FA的耐药率为3.5%(3/85),其中MTB药物敏感株、MDR-MTB和XDR-MTB菌株的耐药率分别为0、0和10.0%(3/30)。鸟分枝杆菌和戈登分枝杆菌临床分离株对FA的耐药率分别为17.4%(4/23)和9.5%(2/21)。FA对分枝杆菌临床分离株的MIC_(50)、MIC_(90)、MIC_(99)值分别为4、16、>32μg/ml,分枝杆菌临床分离株对FA的总体耐药率为7.0%(9/129)。结论:FA对分枝杆菌菌种具有较强的抑菌活性,其中对MTB临床分离株具有很好的抑菌效果。

新型冠状病毒感染合并李斯特菌脑膜炎1例并文献复习

目的提高对新型冠状病毒及单核细胞增多性李斯特菌(Listeria monocytogenes,LM)脑膜炎的认识,增强临床医生对李斯特菌病的诊治水平。方法回顾性分析新型冠状病毒感染合并LM脑膜炎患者1例,并进行文献学习。结果患者女性,77岁,以发热、头痛起病,合并新型冠状病毒感染,通过脑脊液培养及血培养检查,确诊为LM脑膜炎,经过足量青霉素联合庆大霉素、后改为美罗培南抗感染治疗,临床症状缓解,病情得到有效控制。结论针对新型冠状病毒感染和免疫功能紊乱的患者,积极治疗基础病,改善机体免疫状态是关键,一旦确诊李斯特菌病,足量、足疗程应用敏感抗生素对改善预后至关重要。

小球藻提取物促进糖尿病小鼠皮肤创面愈合的作用研究

目的 探讨小球藻提取物(CE)对糖尿病小鼠皮肤创面的愈合作用。方法细胞毒性实验设置空白对照组(CON组),CE低(1 mg/L)、中(10 mg/L)和高(100 mg/L)剂量组;抗氧化实验分组增加了H_(2)O_(2)(100μmol/L)组,各实验组增加了100μmol/L H_(2)O_(2);抗炎实验分组增加了脂多糖(1 mg/L),各实验组增加了1 mg/L脂多糖干预。采用MTT法检测CE的细胞毒性;荧光探针法检测CE的抗氧化作用;荧光定量PCR检测CE的抗炎作用。设置空白CON组、CE低(0.5 g/L)、中(5 g/L)和高(50 g/L)剂量组,采用平板菌落计数法检测CE的抗菌能力。腹腔注射链脲佐菌素法诱导糖尿病小鼠模型,并采用随机数字表法分为CON组、CE低(0.5 g/L)、中(5 g/L)和高(50 g/L)剂量组,每组12只。在小鼠脊柱两侧对称性各做一个直径6 mm的圆形创面进行给药处理,每日1次,连续14 d。分别进行拍照并取材,记录创面愈合情况并对皮肤组织进行组织学(7 d和14 d)及免疫荧光染色(7 d)检测。结果体外实验:CE各剂量组对NIH-3T3细胞都有良好的细胞相容性;与H_(2)O_(2)组相比,CE低、中和高剂量组的活性氧(ROS)荧光信号依次减弱;与脂多糖组相比,CE低、中和高剂量组CD86的表达降低,CD206的表达升高(P<0.05);与CON组相比,CE低、中和高剂量组对细菌生长的抑制作用依次增强(P<0.05)。体内实验:术后第7天和第14天,CE组糖尿病小鼠创面的闭合速率加快,创面愈合效果明显;对创面组织分别进行HE染色和Masson染色发现,与CON组相比,CE低、中和高剂量组糖尿病小鼠创面有更多的胶原沉积。免疫荧光检测结果显示,与CON组相比,CE治疗后的创面的α平滑肌肌动蛋白(α-SMA)、血小板-内皮细胞黏附分子(CD31)及巨噬细胞甘露糖受体(CD206)水平升高,而白细胞分化抗原86(CD86)表达水平降低。结论CE可有效促进糖尿病小鼠创面愈合,其机制可能与其抗氧化、抗炎和抗菌有关。

卟啉基金属有机框架在光疗领域的应用

卟啉基金属有机框架是金属或金属团簇与卟啉配体或其家族化合物配位自组装形成的晶体结构,结合了卟啉类分子良好的光物理特性和生物相容性,具有周期性和可调控的结构,在光化学领域和生物医药领域具有应用潜力;尤其是能够充分发挥卟啉类分子的优越性能,可通过光动、光热等光辅助治疗方法实现杀伤有害细胞的效果。该文介绍了卟啉基金属有机框架的结构,综述了卟啉基金属有机框架在光辅助治疗领域的最新研究进展,主要包括其在光疗抗肿瘤及抗菌领域的应用研究现状,重点介绍了近几年卟啉基金属有机框架在光敏剂基础上的改进以及衍生出的多样化的功能;最后,对其未来发展前景进行了展望。