自体微粒皮与异体脱细胞微粒真皮混合移植对大鼠创面细胞骨架蛋白与新生血管化的影响

目的探讨自体微粒皮与异体脱细胞微粒真皮混合移植对创面愈合的影响,并对有关机理做进一步研究。方法用雄性Wistar大鼠制做异体脱细胞真皮,90只雌性SD大鼠背部建立全层皮肤损伤模型,分为A、B、C、D、E组,每组18只,A组为自体微粒皮组,B组为异体脱细胞微粒真皮组,C、D、E组为自体微粒皮与异体脱细胞微粒真皮按不同的比例（C组为1∶1,D组为1∶0.5,E组为1∶0.25）混合移植（统称为混合移植组）,比较各组的创面愈合率、微血管计数及细胞骨架蛋白（desmin）的表达。结果 （1）移植后2、3周,混合移植组创面愈合率均高于A组和B组,E组移植后2、3周创面愈合率分别为（88.00±5.71）%和（96.18±6.62）%,高于C组（79.81±7.07）%和（86.76±3.35）%（P〈0.05）;（2）移植后2、3周混合移植组微血管数均明显高于A组、B组（P〈0.05）,移植后2周,E组、D组的血管数（35.67±1.53）、（34.33±1.53）明显多于C组（P〈0.05）。（3）细胞骨架蛋白在创面形成后表达上调,混合移植组细胞骨架蛋白的表达高于A组（P〈0.05）,尤以D组、E组明显。结论自体微粒皮与脱细胞微粒真皮混合移植创面愈合率高于自体微粒皮移植,且自体微粒皮与脱细胞微粒真皮混合移植的面积比例按1∶0.25混合移植效果最佳,这可能与创面血管化进程加快,及细胞骨架蛋白的适度表达有关。     

几丁质膜作为表皮干细胞培养支架的实验研究

Objective To investigate the feasibility of constructing a skin tissue engineering cover-ing on chitinous membrane using rat epidermal stem cells (ESCs). Methods Rat ESCs were isolated and cultured by cold digestive method and collagen type Ⅳ adherent method. Cell colonies were observed with in-verted microscope. Expressions of DNA and RNA of ESCs were detected with laser scanning confocal micro-scope. Growth curves of cells were determined with Alamar BlueTM colorimetric method. Expressions of sur-face markers of ESCs (CD29, CD71, CD49d, and CD34) were detected with flow cytometer. Positive expres-sions of CK15, CK19, and P63 of ESCs were determined by immunohistochemistry. Influence of original chi-tinous membrane leachate in different dilutions on ESCs was observed. Condition of growth of ESCs on the ve-hicle was observed. Results Isolated cultured cells were verified as ESCs, of which the doubling generation time was 48 hs. CD29 and CD49d were positive;CD71 and CD34 were negative;CKi9, CK15, and P63 were positive. Compared with that of control group, ESCs cultured in chitinous membrane leachate showed slight cell proliferation when diluted to 1:8-1:512 dilutions, but there was no statistically significant difference (P>0.05). The checkerboard-form cell colonies of ESCs could be visualized with naked eyes on the chi-tinous membrane in 2-4 weeks of culture. A multitude of ESCs were seen to grow on fibres under microscope. Conclusions Chitinous membrane may be used as ESCs culture vehicle, and biological compatibility is good.     

针刺对深Ⅱ度烧伤创面愈合的影响

为研究针刺对烧伤创面愈合的影响,建立深Ⅱ度烧伤动物模型,观察电针足三里穴对创面早期水肿和愈合时间的影响。结果显示：电针足三里穴可减轻创面组织水肿和缩短创面愈合时间,表明针刺可促进烧伤创面愈合。