Therapeutic effects of human umbilical cord-derived mesenchymal stem cells against acute tubular necrosis quantified through measures of iNOS, BMP-7 and Bcl-2

Introduction: Acute tubular necrosis (ATN) is the most prevalent cause of acute renal failure (ARF). Mesenchymal stem cell transplantation has been studied as a potential treatment for renal dysfunction due to ATN. Inducible nitric oxide synthase (iNOS), bone morphogenetic protein-7 (BMP-7) and B-cell lymphoma 2 (Bcl-2) are surrogate markers of renal tubular epithelial regeneration and subsequent recovery of renal function following ATN. Methods: Serum creatinine (Scr) and blood urea nitrogen (BUN), as well as expression of iNOS, BMP-7 and Bcl-2 in gentamycin-induced ATN rat kidneys was investigated after human umbilical cord-derived mesenchymal stem cell (HUC-MSC) transplantation. Immunohistochemical staining was performed in 3 groups of rats: gentamycin-induced ATN treated with HUC-MSC, gentamycin-induced ATN without HUC-MSC, and untreated rats not receiving any treatments. Results: HUC-MSC transplantation led to a reduction in Scr and BUN in the kidneys of rats with gentamycin-induced ATN. Expression of iNOS in the HUC-MSC treated group occurred later and the expression levels were much lower during gentamycin-induced ATN compared to rats with ATN that were not treated with HUC-MSC. The expression of BMP-7 and Bcl-2 in the MSC-transplanted group was significantly increased compared to both control groups of rats with injured and healthy renal tubules. Conclusions: HUC-MSCs induce renal protection in a rat model of gentamycin-induced ATN, which is associated with reduced iNOS expression and up-regulation of Bcl-2 and BMP-7.

rhBMP-2复合生物活性玻璃诱导成骨的实验研究

目的:探讨生物活性玻璃(bioactiveglassBG)对重组人骨形成蛋白-2(recombinanthumanbonemorphogeneticprotein-2,rhBMP-2)诱导骨形成的影响。方法:6只大鼠皮下袋植入rhBMP-2/BG,0.2mg0.5mgrhBMP-2,并设空白对照组。植入后3周行组织学检查。结果:0.5mg组rhBMP-2/BG具有成骨作用,其骨化过程类似于膜内化骨的直接骨形成。结论:rhBMP-2/BG复合物能诱导新骨形成,表明BG适合作为rhBMP-2载体。

急性胰腺炎合并肝损伤时IL-6、氧自由基变化及IL-2、川芎嗪干预的实验研究

目的 :探讨IL - 6、氧自由基在急性胰腺炎 (acutepancreatitis,AP)合并肝损伤中的作用 ,及重组人白介素 - 2 (IL -2 )、川芎嗪的治疗价值。 方法 :SD大鼠 112只 ,随机分为 14组 ,每组 8只。 5 %牛磺胆酸钠逆行胰胆管内注射诱发大鼠AP动物模型 ,检测血浆IL - 6、SOD、MDA、ALT、AST、LDH、LIP、AMY ,并观察肝、胰病理变化。 结果 :①AP组血浆AMY、LIP、ALT、AST、LDH明显升高 (P <0 0 5或 0 0 1) ,镜下可见胰腺水肿、炎细胞浸润、坏死 ,肝脏肝窦充血、细胞浊肿及坏死 ,且损伤程度随时限延长而加重 ;②AP各组血浆IL - 6明显升高 (P <0 0 1) ;③AP各组MDA明显升高 (P <0 0 1)、SOD明显降低 (P <0 0 1)。④IL- 2治疗组、川芎嗪治疗组及IL - 2、川芎嗪联合应用组与NS组比较血浆IL - 6、MDA水平明显下降 (P <0 0 5 ) ,SOD明显升高(P <0 0 5 ) ,胰、肝病理损害程度减轻 ,并且AMY、LIP、ALT、AST、LDH均明显降低 (P <0 0 5 ) ,平均存活时间明显延长 (P <0 0 5 ) ;联合应用组降低IL - 6、MDA水平和减轻胰腺坏死优于单药组。 结论 :①IL - 6、氧自由基在急性胰腺炎合并肝损伤中明显升高 ,起损伤作用 ,而SOD明显降低 ,其保护作用减弱。检测血浆IL - 6、MDA。

Distribution of bone morphogenetic protein receptors in human scleral fibroblasts cultured in vitro and human sclera

AIM: To investigate the distribution of bone morphogenetic protein receptors (BMPRs) in human scleral fibroblsasts (HSFs) and in human sclera. METHODS: Primary HSFs were cultured in vitro. The mRNA levels of BMP-2 and BMPRs in HSFs were assayed by reverse transcription-polymerase chain reaction (RT-PCR). The protein distributions of BMP-2 and BMPRs in HSFs were further detected by immunocytofluorescence and western blot. Their protein expression was also detected in frozen human posterior scleral sections by immunohistofluorescence. RESULTS: BMP-2 and BMPRs were expressed in both HSFs and human sclera not only at mRNA level but also at protein level. The expressions of BMPRIA and BMPRII were higher than that of BMPRIB in the cytoplasm and cell membrane of HSFs in vitra Western blot further verified the results of immunocytofluorescence. In human sclera, BMP2, BMPR IB and BMPR II were found to be expressed in the cytomatrix of HSF, and weak signal was detected about BMPRIA. CONCLUSION: BMP-2 and all three subtypes of BMPRs were found in HSFs and may play a role in scleral remodeling.