梁金环等


[摘要] 目的 探讨养阴活血方药对糖尿病大鼠肾脏线粒体氧化应激损伤的影响及相关机制。 方法 将SD大鼠分为三组,正常对照组(NC组)、糖尿病对照组(DM组)和养阴活血方药治疗组(NYPBR组),后两组应用链脲佐菌素(STZ)制造糖尿病大鼠模型。NYPBR组大鼠给予养阴活血方药防治。10周末,测定各组大鼠血糖、体重、肾重、血肌酐(SCr)、24 h尿蛋白,检测肾脏线粒体丙二醛(MDA)含量及谷胱甘肽过氧化物酶(GSH-Px)、一氧化氮合酶(NOS)、Na+-K+-ATP酶、Ca2+-Mg2+-ATP酶和琥珀酸脱氢酶(SDH)的活性,透射电镜观察肾组织超微结构变化。 结果 与NC组比较,DM组大鼠肾脏线粒体MDA[(1.34±0.24)nmol/mg]、GSH-Px[(57.63±4.91)U/mg]及NOS[(0.81±0.07)U/mg]明显升高(均P < 0.01),Na+-K+-ATP酶[(1.40±0.10)μmol/(mg·h)]、Ca2+-Mg2+-ATP酶[(1.43±0.10)μmol/(mg·h)]和SDH[(24.33±2.31)U/mg]显著降低(均P < 0.01),肾功能减退,肾脏组织发生病理性改变,线粒体出现损伤。养阴活血方药可显著改善上述变化,NYPBR组的MDA[(0.81±0.08)nmol/mg]、GSH-Px[(50.55±5.86)U/mg]及NOS[(0.72±0.07)U/mg]均低于DM组(P < 0.01或P < 0.05),Na+-K+-ATP酶[(1.66±0.18)μmol/(mg·h)]、Ca2+-Mg2+-ATP酶[(1.76±0.20)μmol/(mg·h)]和SDH[(40.92±3.77)U/mg]明显上升(P < 0.05或P < 0.01)。 结论 糖尿病大鼠肾脏线粒体存在明显的氧化应激损伤,NYPBR可显著减轻糖尿病大鼠肾脏线粒体损伤,此作用可能与降低NOS活性,提高SDH、Na+-K+-ATP酶和Ca2+-Mg2+-ATP酶活性有关。
[关键词] 糖尿病肾病;线粒体;氧化应激;养阴活血方药
[中图分类号] R587;R692.3 [文献标识码] A [文章编号] 1673-7210(2015)06(b)-0024-04
Effect of Nourishing Yin and Promoting Bloodflow Recipe on the oxidative stress injuries in renal mitochondria of diabetic rats
LIANG Jinhuan YANG Xiaohui ZHAO Li'na MENG Chenyang CUI Yunpeng LIU Boling
Cangzhou Medical College, Hebei Province, Cangzhou 061001, China
[Abstract] Objective To investigate the effect of Nourishing Yin and Promoting Bloodflow Recipe (NYPBR) on the oxidative stress injuries in renal mitochondria of diabetic rats and related mechanism. Methods SD rats were divided into 3 groups: normal control group (NC group), diabetes control group (DM group) and NYPBR group, the latter 2 groups diabetes rat models were created by streptozotocin (STZ). The NYPBR group was treated with NYPBR. At the end of 10 weeks, blood sugar, body weight, kidney weight, serum creatinine (SCr), 24-hour urine protein were measured, and content or activity of renal mitochondria MDA and glutathion peroxidase (GSH-Px), nitric oxide synthase (NOS), ATPase and succinate dehydrogenase (SDH) were determined for each of the 3 groups, and ultrastructure of renal tissue was observed with transmission electron microscope. Results Compared with NC group, renal mitochondria MDA [(1.34±0.24) nmol/mg], GSH-Px [(57.63±4.91) U/mg] and NOS [(0.81±0.07) U/mg] of DM group were elevated significantly (all P < 0.01), the activities of Na+-K+-ATPase [(1.40±0.10) μmol/(mg·h)], Ca2+-Mg2+-ATPase [(1.43±0.10) μmol/(mg·h)] and SDH [(24.33±2.31) U/mg] decreased greatly (all P < 0.01), and there were renal pathological changes and mitochondria injury. NYPBR could improve the changes. Compared with DM group, renal mitochondria MDA [(0.81±0.08) nmol/mg], GSH-Px (50.55±5.86) U/mg] and NOS [(0.72±0.07) U/mg] of NYPBR group were decreased significantly (P < 0.01 or P < 0.05),Na+-K+-ATPase [(1.66±0.18) μmol/(mg·h)], Ca2+-Mg2+-ATPase [(1.76±0.20) μmol/(mg·h)] and SDH [(40.92±3.77) U/mg] elevated greatly (P < 0.05 or P < 0.01). Conclusion Oxidative stress injuries occur in diabetes rat mitochondria. NYPBR may significantly decrease the injuries of diabetes rat renal mitochondria, which may be related to decreasing in NOS activity, and increasing in SDH, Na+-K+-ATPase and Ca2+-Mg2+-ATPase.
[Key words] Diabetic nephropathies; Mitochondria; Oxidative stress; Nourishing Yin and Promoting Blood Flow Recipe
糖尿病肾病(diabetic nephropathy,DN)即糖尿病肾小球硬化症,是糖尿病特发性全身微血管病变的肾脏表现,是糖尿病最常见和最严重的慢性并发症之一,已成为导致慢性肾衰竭的最主要原因。DN的发病机制,目前尚不完全清楚,随着对DN研究的深入,发现氧化应激在DN发病机制中起重要作用[1-2]。线粒体既是生物氧化及能量转换的主要场所,也是产生活性氧簇(reactive oxygen species,ROS)的主要部位[3]。近年来,线粒体作为氧化应激的重要细胞器而备受关注。本实验拟通过建立糖尿病大鼠模型,观察养阴活血方药(Nourishing Yin and Promoting Bloodflow Recipe,NYPBR)对糖尿病大鼠肾功能、肾脏线粒体形态与功能及氧化应激指标丙二醛(MDA)、谷胱甘肽过氧化物酶(GSH-Px)及一氧化氮合酶(NOS)水平的改变,探讨NYPBR对糖尿病大鼠肾脏线粒体的影响及可能机制,为临床防治DN提供新思路。……