南极磷虾油对骨质疏松模型小鼠骨折愈合的促进作用

目的：探究南极磷虾油（Antarctic krill oil,AKO）对骨质疏松模型小鼠骨折愈合的促进作用。方法：采用C57BL/6J雌性小鼠,通过双侧去卵巢术建立骨质疏松模型;随后行右胫开放性骨折手术并随机分为一般性骨折对照组、骨质疏松性骨折模型组、阳性对照组、AKO组。于骨折后5、11、24、35、56 d取材,动态分析AKO对小鼠血清相关指标、骨痂组织形态学、显微结构和生物力学以及软骨内成骨关键基因表达的影响。结果：酶联免疫吸附测定结果表明AKO能显著升高血清中血管内皮生长因子（vascular endothelial growth factor,VEGF）质量浓度及骨碱性磷酸酶活力;骨痂苏木精-伊红染色及微型计算机断层扫描结果显示AKO能够促进软骨痂向硬骨痂转化,并改善骨痂微结构,加速骨痂重塑;生物力学检测结果显示AKO可增强骨性骨痂生物力学性能;实时荧光定量聚合酶链式反应结果显示,AKO可显著提高血管入侵相关因子（VEGF、血小板衍生生长因子和血管紧张素1）的mRNA表达（P＜0.05）,显著降低软骨细胞增殖和肥大相关基因（聚集蛋白聚糖A g g r e c a n和Col10a）的表达（P＜0.05）,显著升高软骨基质降解因子MMP-13以及骨生成相关基因（Col1a、骨钙素和骨形态发生蛋白2）的表达（P＜0.05）,提示AKO可通过调控软骨内成骨关键基因的表达,加速软骨内骨化进程。结论：AKO通过促进软骨内成骨及骨痂重塑,加速骨质疏松模型小鼠骨折愈合,提高愈合质量。     

Lactococcus lactis subsp. lactis HFY14对狼疮性肾炎小鼠肾功能的改善作用

本实验研究分离自四川红原自然发酵牦牛酸乳的Lactococcus lactis subsp. lactis HFY14(LLSLHFY14)对降植烷诱导狼疮性肾炎小鼠肾功能改善的效果。采用不同剂量LLSLHFY14灌胃小鼠，分析小鼠血清白细胞介素(interleukin,IL)-2、IL-12等免疫指标的变化情况，然后通过苏木精-伊红(hematoxylin-eosin,H&E)切片观察肾脏组织的病变情况，通过定量聚合酶链式反应(quantitative polymerase chain reaction,qPCR)和Western blot测定肾脏组织中的IL-4、IL-1β和转化生长因子-β(transforming growth factor beta,TGF-β)mRNA相对表达量和蛋白相对表达量。结果显示，LLSLHFY14能够提升狼疮性肾炎小鼠胸腺指数和脾脏指数。血清实验显示LLSLHFY14能够抑制狼疮性肾炎造成的小鼠IL-2、IL-12、总蛋白(total protein,TP)、白蛋白(albumin,ALB)质量浓度下降和干扰素γ(interferon ga...     

鼠李糖乳酪杆菌对乳鼠肠道发育和阪崎克罗诺杆菌致坏死性肠炎的影响

为研究鼠李糖乳酪杆菌（Lacticaseibacillus rhamnosus）SW-02 对乳鼠肠道发育的影响,将新生C57BL/6 小鼠以SW-02（1×107 CFU/d）灌胃,饲养2 周后,检测体质量、脏器指数、肠道组织苏木精-伊红染色、细胞增殖标志基因和紧密连接蛋白的mRNA 水平及免疫球蛋白A（immunoglobulin A,IgA）水平;将新生小鼠分为对照组、阪崎克罗诺杆菌组（CS 组）、SW-02 干预组（CS+SW-02 组）,饲养至第10 天,检测体质量、肠道组织苏木精-伊红染色、细胞增殖标志基因和紧密连接蛋白的mRNA 水平及炎症因子水平,研究SW-02 对阪崎克罗诺杆菌致坏死性小肠结肠炎的影响。结果显示,鼠李糖乳酪杆菌SW-02 能够促进乳鼠早期的生长,促进机体肠道发育和免疫功能,还可以有效改善阪崎克罗诺杆菌对乳鼠肠道造成的损伤,降低炎症。     

人源乳杆菌联合菊粉对2型糖尿病小鼠的改善作用

目的：探究人源乳杆菌联合菊粉对2型糖尿病小鼠的改善效果及机制。方法：采用db/db糖尿病模型小鼠,灌胃4 株人源乳杆菌混合菌剂（10 mL/（kg mb·d）,每株菌的活菌数约1.0×109 CFU/mL）,基础饲料添加质量分数5%菊粉,对小鼠进行饮食干预,每周测定小鼠体质量、摄食量和空腹血糖浓度;干预末期进行小鼠口服葡萄糖耐量试验和胰岛素耐受试验;实验结束后测定小鼠空腹血糖浓度、血脂指标、糖化血清蛋白浓度、炎症因子mRNA相对表达水平、磷脂酰肌醇-3-激酶（phosphatidylinositol-3-kinase,PI3K）和丝氨酸/苏氨酸激酶（serine/threonine kinase,AKT）相对表达水平;取小鼠胰腺、肾脏和肝脏采用苏木精-伊红染色并观察组织形态。结果：人源乳杆菌联合菊粉干预可有效调节糖尿病模型小鼠血糖浓度和血脂指标水平,降低胰岛素抵抗和糖化血清蛋白浓度;抑制促炎因子白细胞介素（interleukin,IL）-6和IL-1β的mRNA表达,促进抑炎因子IL-10的mRNA表达;上调PI3K和AKT蛋白的表达;对肝脏、肾脏和胰腺的损伤有明显的改善作用。结论：人源乳杆菌联合菊粉通过有效降低胰岛素抵抗、抑制炎症反应和促进PI3K/AKT信号通路表达改善2型糖尿病小鼠症状。     

植物乳杆菌Sc52对脂多糖诱导小鼠肠道屏障损伤的保护作用

目的：研究植物乳杆菌（Lactobacillus plantarum）Sc52对脂多糖（lipopolysaccharide,LPS）诱导小 鼠肠道屏障损伤的保护作用。方法：选取6 周龄雄性ICR小鼠,随机分为3 组,实验组每天灌胃植物乳杆菌 Sc52（1010 CFU/d）,空白组与模型组灌胃等量生理盐水,连续两周后,除空白组外,一次性腹腔注射LPS（15 mg/kg） 建立小鼠肠屏障损伤模型。检测小鼠血清中炎症因子及与肠道通透性相关指标水平,苏木精-伊红染色观察回肠组 织病理学变化,气相色谱法测定小鼠肠道短链脂肪酸水平,平板计数法分析小鼠粪便中主要菌群数量,蛋白质印记 法分析小鼠回肠上皮细胞间紧密连接蛋白表达水平。结果：预先灌胃植物乳杆菌Sc52能够降低小鼠血清中肿瘤坏 死因子、白细胞介素-6、白细胞介素-12、一氧化氮等炎症相关因子水平。植物乳杆菌Sc52通过调节D-乳酸和二胺 氧化酶的水平,改善肠道通透性。灌胃植物乳杆菌Sc52能够提高小鼠肠道中乙酸和丁酸含量,能够增加小鼠肠道 中乳杆菌、双歧杆菌等有益微生物的数量,抑制有害微生物的生长;显著上调回肠组织中紧密连接蛋白Occludin和 Claudin-1的表达。结论：植物乳杆菌Sc52对小鼠肠道屏障功能具有保护作用。     

桑叶生物碱对高脂饮食诱导小鼠肝损伤的改善作用及机理

目的：探讨桑叶生物碱对高脂饮食诱导小鼠肝损伤的改善作用与机理,为桑叶的科学利用提供参考。方法：用高脂饲料喂饲小鼠的同时灌胃不同剂量的桑叶生物碱,于第4、8、12、16周末检测小鼠肝脏系数和血浆谷丙转氨酶（alanine aminotransferase,ALT）、谷草转氨酶（aspartate aminotransferase,AST）活力;取肝组织进行苏木精-伊红染色观察组织病理学改变;实时定量聚合酶链式反应测定肝组织炎症因子白细胞介素-10（interleukin-10,IL-10）、肿瘤坏死因子-α（tumor necrosis factor-α,TNF-α）和细胞凋亡因子Bax、Bcl-2 mRNA表达水平。结果：与高脂对照组比,随着桑叶生物碱灌胃剂量的增加和时间的延长,小鼠肝脏系数及ALT、AST活力显著下降（P＜0.05）,肝脏中脂质沉积和脂肪变性得到改善,IL-10、Bcl-2 mRNA表达水平显著上升（P＜0.05）,TNF-α、Bax mRNA表达水平显著降低（P＜0.05）。200 mg/kg mb桑叶生物碱灌胃16 周能使肝损伤小鼠机体各指标恢复到正常水平。结论：桑叶生物碱对高脂饮食导致的肝损伤有良好的改善作用,其机制可能与调节炎症因子（TNF-α、IL-10）和细胞凋亡因子（Bax、Bcl-2）的mRNA表达水平有关。     

植物乳杆菌KSFY04通过调节核因子κB信号通路干预小鼠血栓形成的效果

通过角叉菜胶建立小鼠血栓模型，观察植物乳杆菌KSFY04（Lactobacillus plantarum KSFY04，LP-KSFY04）通过调节核因子κB（nuclear factor κB，NF-κB）相关炎症通路抑制血栓形成的效果。采用生化试剂盒和定量聚合酶链式反应（quantitative polymerase chain reaction，qPCR）检测小鼠血清、组织相关指标，苏木精-伊红（hematoxylin-eosin，HE）切片观察组织病变，并观察肠道微生物组成。结果：LP-KSFY04能够有效减轻血栓小鼠黑尾程度，并延长血栓小鼠活化部分凝血活酶时间、缩短凝血酶原时间、凝血酶时间及降低纤维蛋白原水平。LP-KSFY04还能够降低血栓小鼠血清、肾脏和肝脏炎症细胞因子肿瘤坏死因子α（tumor necrosis factor α，TNF-α）、白细胞介素（interleukin，IL）6和IL-1β的水平。病理学观察发现LP-KSFY04能够减轻血栓造成的肝肾组织病变和尾静脉血栓积累。qPCR结果显示，LP-KSFY04下调血栓小鼠尾静脉血管组织NF-κB p65、IL-6、TNF-α、细胞间黏附分子1（intercellular cell adhesion molecule 1，ICAM-1）、血管细胞黏附分子1（vascular cell adhesion molecule 1，VCAM-1）和选择素E的mRNA表达水平。同时，LP-KSFY04能够增加拟杆菌门、乳酸杆菌属、双歧杆菌属的丰度并降低厚壁菌门丰度。结论：LP-KSFY04对血栓小鼠具有减轻炎症和抑制血栓形成的作用，且高剂量LP-KSFY04作用更好，效果接近药物双嘧达莫。     

人参、甘草、五味子复合醋提物对老年小鼠急性炎性肝损伤保护作用的研究

目的:本研究旨在通过脂多糖(Lipopolysaccharide,LPS)诱导肝损伤小鼠考察复合醋提物(MVE)对老年小鼠炎性肝损伤的保护效果.方法:将小鼠随机分为正常对照组、MVE组、LPS组、LPS+MVE组.通过苏木精-伊红染色评估肝组织病理情况和免疫组织化学染色判断髓过氧化物酶的表达变化.同时,检测肝组织中白介...     

南极磷虾油对小鼠肠黏膜屏障的保护作用及机制

为探究南极磷虾油对脂多糖所致肠黏膜屏障损伤的预防作用及其机制,选取32只雄性小鼠随机分为4组:正常对照组、模型组(脂多糖组)、南极磷虾油干预组和鱼油干预组.前两组灌胃橄榄油,后两组分别灌胃400 mg/kg(以体重计)以橄榄油为溶剂稀释的南极磷虾油或鱼油,每日1次.连续干预4周后,正常组小鼠经腹腔注射生理盐水,其余3组注射10 mg/kg(以体重计)脂多糖,6h后处死小鼠.苏木精-伊红染色后,观察小鼠小肠组织病理学变化;测定小鼠血清和小肠中二胺氧化酶活性,蛋白免疫印迹法分析紧密连接蛋白和诱导型一氧化氮合酶蛋白表达;检测髓过氧化物酶和一氧化氮含量,实时荧光定量PCR法检测促炎细胞因子mRNA表达;蛋白免疫印迹法分析TLR4/NF-κB信号通路相关蛋白表达水平.实验结果显示,南极磷虾油预防性干预能显著抑制脂多糖所致小鼠小肠绒毛长度与隐窝深度比值的降低;下调血清二胺氧化酶水平,提高小肠二胺氧化酶活性,增加肠道紧密连接蛋白Claudin-1、Occludin和ZO-1蛋白表达水平;抑制髓过氧化物酶活性、诱导性一氧化氮合酶蛋白表达和一氧化氮含量升高,降低TNF-α、IL-1β和IL-6的mRNA表达以及TLR4/NF-κB信号通路相关蛋白表达水平.研究结果表明,南极磷虾油可通过抑制TLR4/NF-κB信号通路预防脂多糖所致肠黏膜屏障损伤,且其效果优于传统鱼油.     

虾青素对高脂HepG2细胞及高脂膳食饲喂C57BL/6J小鼠血脂代谢的影响

为研究虾青素对油酸诱导高脂HepG2细胞及高脂膳食饲喂C57BL/6J小鼠血脂代谢的影响。本实验建立油酸诱导HepG2细胞脂肪堆积体外模型,采用油红O对胞内脂滴染色测定脂滴含量,同时测定正常组、高脂组及虾青素组细胞内甘油三酯(triglyceride,TG)、总胆固醇(total cholesterol,TC)浓度。通过高脂膳食饲喂C57BL/6J小鼠,测定正常组、高脂组及虾青素干预组小鼠血清中TC、TG及高密度脂蛋白胆固醇水平;苏木精和伊红染色观察肝组织形态学变化;应用实时荧光定量聚合酶链式反应检测肝脏中脂肪调控相关基因mRNA表达水平;应用气相色谱检测粪便中短链脂肪酸的排泄量。结果表明:虾青素能够显著抑制油酸诱导的HepG2细胞脂肪堆积,显著降低胞内TG、TC浓度(P0.05);与高脂组相比,给予虾青素后,小鼠的TC和TG水平均显著降低(P0.05);苏木精和伊红染色结果表明虾青素干预组脂肪变性程度明显减轻;同时虾青素干预后总短链脂肪酸的含量显著增加,且肝脏中脂肪合成相关基因SREBP-1C和FAS表达水平显著下调(P0.05)。结论:虾青素通过降低HepG2细胞中脂滴含量、调节血脂水平、提高粪便中短链脂肪酸的含量,改善肝脏病理状态,调控肝脏中脂肪合成相关基因的表达,对血脂代谢起到调节作用。     

海参皂苷对去卵巢小鼠骨密度的改善作用及机制

目的：研究海参皂苷对双侧去卵巢小鼠骨密度的影响及作用机制。方法：雌性健康C57BL/6J小鼠采用去卵巢术建立骨质疏松症模型,术后4 周,随机分为假手术组（生理盐水）、模型组（生理盐水）和低、高剂量海参皂苷组（分别为7.5、15.0 mg/kg mb）。连续灌胃90 d后,检测尿钙浓度、尿磷浓度、骨密度和骨矿化沉积率,评价海参皂苷对模型小鼠骨矿物质的影响;进一步通过测定ALP等成骨标志指标的mRNA表达情况,以及调控其表达水平的Wnt/β-catenin通路关键基因的mRNA表达情况,探究海参皂苷改善骨密度的分子机制。结果：尿液检测显示,海参皂苷能够显著降低尿钙、磷浓度（P＜0.05）,减少骨矿流失;双能X射线扫描及荧光双标记结果显示,海参皂苷能显著增加去卵巢小鼠骨密度,提高骨矿化沉积率（P＜0.05）;实时荧光定量聚合酶链式反应结果表明,海参皂苷显著降低Wnt/β-catenin通路中关键基因的水平（P＜0.05）,下调骨生成标志基因ALP、OCN、Col1a和BMP2的mRNA表达水平（P＜0.05）。结论：海参皂苷能通过抑制Wnt/β-catenin通路降低去卵巢模型小鼠代偿性增加的骨生成,并能够抑制骨矿流失,提高骨密度和骨矿化沉积,改善骨质疏松症。     

Pregnancy, bovine somatotropin, and dietary n-3 fatty acids in lactating dairy cows: II. Endometrial gene expression related to maintenance of pregnancy

The objectives were to examine the effects of bovine somatotropin (bST), pregnancy, and dietary fatty acids on expression of key endometrial genes and proteins regulating prostaglandin synthesis in lactating dairy cows. Two diets were fed, at about 17 d in milk (DIM), in which oil of whole cottonseed (control diet) was compared with calcium salts of fish oil-enriched lipid (FO). Ovulation was synchronized in cows with a presynchronization plus Ovsynch protocol and cows were inseminated artificially or not inseminated on d 0 (d 0 = time of synchronized ovulation; 77 ± 12 DIM). On d 0 and 11, cows received bST (500 mg) or no bST, and were slaughtered on d 17 to recover uterine secretions and endometrial tissue. Number of cows in the control diet: 5 bST-treated cyclic (bST-C), 5 non-bST-treated cyclic (no bST-C), 4 bST-treated pregnant (bST-P), and 5 non-bST-treated pregnant (no bST-P) cows and in the FO diet: 4 bST-treated FO-cyclic (bST-FO-C) and 5 non-bST-treated cyclic (no bST-FO-C) cows. The FO diet increased progesterone receptor (PR) mRNA, and treatment with bST increased PR mRNA concentration in endometrium of no bST-C, but not in no bST-FO-C or no bST-P cows. Concentrations of estrogen receptor-α (ERα) mRNA and protein, and oxytocin receptor (OTR) mRNA were decreased in no bST-P cows compared with no bST-C cows. Treatment with bST tended to increase OTR and ERα mRNA concentrations in cyclic cows fed control or FO diets. Immunohistochemistry demonstrated effects of bST, FO, and pregnancy on distributions of ERα and PR proteins in endometrium. Pregnancy and FO feeding decreased ERα abundance in luminal epithelium. Prostaglandin H synthase-2 (PGHS-2) protein was elevated in pregnant cows and localized to the luminal epithelium. Both FO and bST treatments reduced staining intensity of PGHS-2 protein. Concentrations of prostaglandin E synthase mRNA were elevated in either cyclic or pregnant cows in response to bST, whereas bST decreased prostaglandin F synthase mRNA in pregnant cows. Uterine lumen fluids had more PGF_2α and prostaglandin E₂ in pregnant than cyclic cows. Uterine lumen fluids of bST-P cows contained more prostaglandin E₂ than those from no bST-P cows. In summary, both pregnancy and bST altered endometrial gene expression, and cyclic cows responded differently to bST than pregnant cows. Feeding FO modulated PR, ERα, and PGHS-2 expression and distribution among endometrial cell types in a manner that may favor establishment and maintenance of pregnancy.     

软骨多糖预防小鼠骨性关节炎的作用研究

本文探讨了软骨多糖对小鼠骨性关节炎(osteoarthritis,OA)的预防作用.将昆明种小鼠随机分为三组,给药组灌胃15d后,连续30d每天早晚各用4℃冷水冷冻刺激小鼠右腿膝关节建立OA模型.通过评定小鼠平均关节炎指数(MAI)及小鼠的器官指数,检测小鼠血清中一氧化氮(nitric oxide,NO)、细胞因子白细...     

枸杞中绿原酸对转化生长因子-β1诱导心肌成纤维细胞纤维化的影响

目的：考察枸杞中分离得到的绿原酸对转化生长因子-β1（transforming growth factor-β1，TGF-β1）诱导心肌成纤维细胞（cardiac fibroblasts，CFs）纤维化的干预效果。方法：质量浓度10 ng/mL TGF-β1诱导CFs建立心肌纤维化细胞模型，用不同质量浓度绿原酸处理纤维化细胞，细胞毒性实验（cell counting kit-8，CCK-8）检测绿原酸对CFs增殖的影响；酶联免疫吸附试验（enzyme linked immunosorbent assay，ELISA）检测纤维化标志蛋白胶原蛋白（collagen，Col）I、Col III和免疫荧光检测α-平滑肌肌动蛋白（α-smooth muscle actin，α-SMA）的表达；实时荧光定量聚合酶链式反应（quantitative real-time polymerase chain reaction，qPCR）检测Twist1、Acta2、Snail2及纤维化蛋白S100A4等mRNA表达水平；Western blot检测TGF-β1/Smads信号通路相关蛋白及其磷酸化表达水平。结果：CCK-8检测表明枸杞中分离得到的绿原酸能抑制细胞异常增殖；ELISA和免疫荧光检测表明，枸杞中分离得到的绿原酸能下调纤维化标志蛋白Col I、Col III和α-SMA的表达；qPCR检测表明枸杞中分离得到的绿原酸能高度显著下调纤维化转录调控因子Acta2、Twist1、Snail1、Snail2、Smad4及纤维化蛋白S100A4的mRNA表达（P＜0.001）；Western blot检测表明枸杞中分离得到的绿原酸能高度显著下调TGF-β1/Smads信号通路相关蛋白的表达（P＜0.001）。结论：在本研究质量浓度范围内，枸杞中分离得到的绿原酸抑制TGF-β1诱导的CFs纤维化过程，其机制可能与TGF-βl/Smads信号通路有关。     

Expression of Col1a1, Col1a2 and procollagen I in germ cells of immature and adult mouse testis

The objective of this study was to compare the expression of Col1a1, Col1a2, and procollagen I in the seminiferous tubules of immature and adult mice and to characterize the cellular expression pattern of procollagen I in germ cells during spermatogenesis in order to provide necessary groundwork for further functional studies in the process of spermatogenesis. Microarray analysis demonstrated that Col1a1 and Col1a2 were abundantly expressed in the seminiferous tubules of 6-day-old mice compared with 60-day-old mice, and the expression levels of Col1a1 and Col1a2 mRNA were validated using a semi-quantitative RT-PCR assay. Western blot analysis further confirmed that procollagen I was expressed at a higher level in the seminiferous tubules of 6-day-old mice compared with 60-day-old mice. Immunohistochemical analysis revealed that type A spermatogonia were positive for procollagen I in the testis of 6-day-old mice, whereas Sertoli cells were negative for this protein. The in vivo procollagen I staining in type A spermatogonia was corroborated in spermatogonia exhibiting a high potential for proliferation and the ability to form germ cell colonies in in vitro culture. Moreover, procollagen I was also detected in type A spermatogonia, intermediate spermatogonia, type B spermatogonia, and preleptotene spermatocytes in the adult mouse testes, but positive staining disappeared in more differentiated germ cell lineages detaching from the basement membrane, including leptotene spermatocytes, pachytene spermatocytes, round spermatids and elongated spermatids. These data suggest that Col1a1, Col1a2 and procollagen I are associated with type A spermatogonia and play a potential role in mediating the detachment and migration of germ cells during spermatogenesis.     

黑灵芝多糖对免疫抑制小鼠肠道黏膜形态及肠道黏膜免疫的影响

目的：探究黑灵芝多糖对免疫抑制小鼠肠道黏膜形态及肠道黏膜免疫的影响。方法：腹腔注射环磷酰胺构建免疫抑制小鼠模型,将小鼠分为6 组：正常对照组、模型组、阳性对照组以及黑灵芝多糖低、中、高剂量（25、50、100 mg/（kg·d））组,灌胃期间每天记录小鼠体质量并观察其生活状态,空肠组织进行切片病理学观察,酶联免疫吸附实验测定肠道白细胞介素（interlrukin,IL）-6、IL-10、肿瘤坏死因子-α（tumor necrosis factor-α,TNF-α）及干扰素-γ（interferon-γ,IFN-γ）的含量,反转录定量聚合酶链式反应分析T-bet、GATA-3 mRNA相对表达水平。结果：与模型组相比,低、中、高剂量黑灵芝多糖有助于体质量回升,改善肠道黏膜形态结构,提高IL-6、IL-10、TNF-α、IFN-γ细胞因子含量,增强T-bet、GATA-3 mRNA相对表达水平,使Th1/Th2平衡向Th1偏移。结论：黑灵芝多糖可改善免疫抑制小鼠的肠道黏膜形态,调节免疫抑制小鼠的肠道黏膜免疫。     

Novel gene-modified-tissue engineering of cartilage using stable transforming growth factor-beta1-transfected mesenchymal stem cells grown on chitosan scaffolds

Rabbit bone marrow-derived mesenchymal stem cells (MSCs) were stably transfected with the TGF-beta1 gene in monolayer culture using Lipofectamine 2000. After transfection, the expression of cartilage-specific extracellular matrix was upregulated, whereas matrix metalloproteinases 1 and 3 (MMP 1 and 3) protein expressions and enzymatic activities were downregulated. Autologous MSCs modified with the TGF-beta1 gene were seeded into chitosan scaffolds to construct gene-modified cartilage, which was then implanted into the full-thickness articular cartilage defects of rabbits' knees. Twelve weeks after implantation, the defects were filled with regenerated hyaline-like cartilage tissue as confirmed by the positive immunohistochemical staining of collagen type II and intense toluidine blue staining of proteoglycan. Our findings suggest that the repair of cartilage defects can be enhanced by TGF-beta1 gene-modified-tissue engineering of cartilage on the basis of a strategy using MSCs, chitosan, and liposomal transfection.     

南极磷虾油对硫酸葡聚糖钠盐诱导溃疡性结肠炎小鼠的抗氧化作用机制

目的:探讨南极磷虾油(Antarctic krill oil,AKO)对硫酸葡聚糖钠盐(dextran sulfate sodium,DSS)诱导溃疡性结肠炎(ulcerative colitis,UC)小鼠的抗氧化作用及其机制.方法:BALB/c小鼠随机分成4组:对照组、DSS组、低剂量AKO组(L-AKO,0.25...