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2011年第3期
糖尿病大鼠骨骼肌病变发病机制初步探讨
MECHANISMS STUDIES ON MYOATROPHY OF RATS WITH DIABETS
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DOI:
作者:
项静燕,赵玉武,周健?
XIANG Jingyan,ZHAO Yuwu, zhou Jian
作者单位:
上海市第六人民医院神经内科(1-2) 上海市第六人民医院内分泌科(3)
Department of Neurology, Sixth People’s Hospital Affiliated to Shanghai Jiaotong University, Shanghai
关键词:
糖尿病; 蛋白激酶C; B细胞淋巴瘤/白血病-2; bax; 天冬氨酸特异性半胱氨酸蛋白酶-3; 碱性成纤维生长因子
Diabetic; Protein kinase C; bcl-2; bax; Caspase-3; b-FGF
摘要:
目的 初步探讨糖尿病大鼠骨骼肌病变可能的发病机制。方法 使用链脲菌素(STZ)建立糖尿病大鼠模型,16只SD大鼠随机分为糖尿病组(随机血糖≥16.65mmol/L)和正常对照组,采用ELISA法测定静脉血PKC值,取后肢腓肠肌肌肉HE染色进行组织学观察,并采用免疫组化方法测定肌肉组织b-FGF、Bax、Bcl2和caspase3值,冷冻标本采用FQ-PCR方法检测b-FGF、caspase-3、bcl-2、bax的mRNA表达。结果 1、对照组骨骼肌表现为正常的组织学结构,糖尿病组骨骼肌表现为普遍性萎缩,肌纤维萎缩变细,纤维变性,水肿,部分区域坏死,纤维断裂,肌丝走行紊乱,核固缩,横纹模糊消失,间质脂肪组织略增生。2、糖尿病大鼠血中PKC值显著高于正常对照组(P<0.01)。3、糖尿病组的b-FGF值显著低于正常对照组(P<0.01)。4、糖尿病组的caspase3较正常对照组显著升高(P<0.01),Bax值与bax/bcl-2值较正常对照组高(P<0.05),而Bcl2值较正常对照组下降(P<0.05)。5、糖尿病组的b-FGF Ct值较正常对照组升高(P<0.05)、bcl-2 Ct值较正常对照组显著升高(P<0.01),而caspase-3和bax Ct值较正常对照组显著降低(P<0.01)。结论 糖尿病组骨骼肌组织学变化主要表现为普遍性萎缩;PKC途径被激活、碱性成纤维生长因子减少及细胞凋亡共同参与了糖尿病骨骼肌病变的发生和发展。
Objective To explore the possible mechanism of myoatrophy of rats with diabetes. Methods 16 SD rats were randomly divided into two groups: normal control group, diabetic group. We observed the general structure of the muscular tissue by HE sections. The expressions of PKC were studied by ELISA. The b-FGF, bax, bcl-2 and caspase3 were studied by immunohistochemistry. We also study the b-FGF, bax, bcl-2 and caspase3 by FQ-PCR. Results 1.Histological observation: With HE staining,the skeletal muscle sections in control group showed normal structure. Morphometric changes of skeletal muscle in experimental diabetic rats were characterized primarily by widespread myoatrophy, muscle fiber denaturalization and necrosis,transverse striationia. The level of PKC in diabetic group was significantly higher than that of normal control group (P<0.01). The b-FGF of diabetic group was significantly lower than that of control group (P<0.01). The level of bax was higher and the level of bcl-2 was lower in diabetic group than that of control group(P<0.05), the level of Caspase3 was significantly higher (P<0.01) in diabetic group than that of normal control group. The ct value of b-FGF and bcl-2 was higher in diabetic group than that of control group (P<0.05, P<0.01), the ct value of bax and Caspase-3 was significantly lower in diabetic group(P<0.01). Conclusion Morphometric changes of skeletal muscle of diabetic group rats were characterized primarily by widespread atrophy. Activated PKC, reduced b-FGF and apoptosis may be causes of diabetic myoatrophy.