硫化氢对糖尿病大鼠皮肤溃疡创面愈合的影响

目的:探讨硫化氢对糖尿病大鼠皮肤溃疡创面愈合的影响。方法:将30只健康雄性SD大鼠,随机分为正常对照组(NDC组)、糖尿病对照组(UDC组)和硫化氢处理组(TDA组),每组10只。腹腔注射链脲佐菌素(65 mg/kg)柠檬酸缓冲液(p H 4.5)建立糖尿病大鼠模型。1周后,将正常大鼠及糖尿病大鼠背部剪开直径为20mm的圆形切口,正常组和糖尿病组大鼠的溃疡创面以空白基质处理,硫氢化处理组则用2%的硫氢化钠涂抹溃疡创面。分别在给药后第5、10、15、20天测定伤口愈合率。21 d后处死大鼠,分别收集血浆以及肉芽组织,检测血浆的凝血酶原时间(prothrombin time,PT)、凝血酶时间(thrombin time,TT)及纤维蛋白原(fibrinogen,FIB),白细胞和淋巴细胞计数,ELISA检测血清超氧化物歧化酶(SOD)活性和丙二醛(MDA)的含量,Western blot检测肉芽组织中血红素加氧酶1(HO-1)和肿瘤坏死因子α(TNF-α)的表达水平;肉芽组织进行HE染色,光镜观察组织形态的变化。结果:与糖尿病组比较,硫氢化钠处理明显加快大鼠伤口愈合(P0.01),提高了血清SOD活性(P0.01),同时降低了MDA水平(P0.01);血液学检测显示,硫氢化钠明显降低白细胞及淋巴细胞数量,延长PT及TT,降低FIB水平。病理切片观察显示,糖尿病对照组大鼠肉芽组织有炎症细胞浸润,胶原纤维排列疏松且不规则,而硫化氢组大鼠肉芽组织中胶原排列整齐,血管生成增多(P0.05)。此外,TDA组HO-1表达明显高于UDC组,而TNF-α的水平则显著低于UDC组。结论:硫化氢可促进糖尿病大鼠伤口愈合,其机制可能与其提高抗炎及抗氧化作用、改善微循环进而修复组织损伤有关。

Effects of hydrogen sulfide on wound healing of skin ulcer in diabetic rats

AIM: To study the effect of hydrogen sulfide on wound healing of skin ulcer in diabetic rats.METHODS: Male SD rats were randomly divided into 3 groups, including non-diabetic control(NDC) group, untreated diabetic control(UDC) group, and treated diabetic administration(TDA) group. Diabetic rats were induced by intraperitoneal injection of streptozotocin(STZ). After 1 week, wound healing model was prepared by making a round incision(2.0 cm in diameter) on the dorsal skin in full thickness. The rats from TDA group received 2% sodium bisulfide ointment on the skin ulcer wound, and the animals from UDC and NDC groups received control cream. After 21 d of treatment with sodium bisulfide, blood samples were collected for biochemical analysis, including prothrombin time(PT), thrombin time(TT), and fibrinogen(FIB) in plasma, as well as the activity of superoxide dismutase(SOD) and the content of malondialdehyde(MDA) in the serum. White blood cells(WBC) and lymphocytes were also counted. Granulation tissues from the wound were processed for histological examination and Western blot analysis was used to detect heme oxygenase-1(HO-1) and tumor necrosis factor α(TNF-α) expression.RESULTS: Compared with UDC group, sodium bisulfide treatment accelerated wound healing of skin ulcer(P<0.01), and increased the activity of SOD in serum(P<0.01) in the diabetic rats. The declined number of WBC and lymphocytes, prolonged PT and TT, and decreased FIB levels in rats treated with sodium bisulfied were also confirmed. Pathological section showed that there were inflammatory cell infiltration, and irregular and loose fibril alignment in the granulation tissue of rats from the UDC group, but there were regular fibril alignment and increased angiogenesis in the granulation tissue of rats from the TDA group(P<0.05). Furthermore, sodium bisulfide treatment raised HO-1 protein expression, and decreased TNF-α protein expression in the diabetic rats.CONCLUSION: Hydrogen sulfide accelerates the wound healing of skin ulcer in the rats with diabetes. The beneficial effect of H₂S may be associated with formation of granulation, anti-inflammation, and antioxidation.