辛夷挥发油抑制糖尿病肾病大鼠血清及肾组织P-选择素蛋白表达

目的：观察辛夷挥发油对糖尿病模型大鼠血清及肾组织中P-选择素蛋白表达的影响,探讨其对糖尿病大鼠肾脏的保护作用及其机制。方法：50只SD大鼠随机分为正常对照组、模型组和辛夷挥发油大、中、小剂量治疗组。通过1次性腹腔注射1%链脲佐菌素复制1型糖尿病大鼠模型,造模前后及成模后第4、8、12周检测各组大鼠的随机血糖（random blood glucose,RBG）和24h尿微量白蛋白;第12周取血检测血尿素氮和血肌酐;光镜（PAS染色）观察大鼠肾组织病理变化;酶联免疫吸附测定法检测大鼠血清可溶性P-选择素蛋白表达,免疫组织化学法检测大鼠肾组织中P-选择素蛋白表达。结果：与正常对照组相比,模型组RBG、24h尿微量白蛋白、血尿素氮、血清可溶性P-选择素水平和肾组织中P-选择素蛋白表达均升高（P〈0.01）,血肌酐降低（P〈0.01）,病理改变较明显。辛夷挥发油各治疗组24h尿微量白蛋白、血清可溶性P-选择素水平和肾组织中P-选择素蛋白表达均较模型组显著降低（P〈0.01）,病理改变亦较模型组轻。但辛夷挥发油各浓度组间差异无统计学意义（P〉0.05）。结论：辛夷挥发油可能通过抑制糖尿病大鼠血清及肾组织中P-选择素蛋白表达发挥对肾脏的保护作用。

Volatile oil of Magnolia biondii inhibits expressions of P-selectin protein in serum and renal tissue of rats with diabetic nephropathy

OBJECTIVE: To investigate the protection mechanism of volatile oil of Magnolia biondii Pamp. (VOMBP) against diabetic nephropathy in rats by observing its effects on level of soluble P-selectin (sP-selectin) in serum and expression of P-selectin in renal tissue. METHODS: Fifty SD rats were randomly divided into normal control group, untreated group, and low-, medium- and high-dose VOMBP-treated group. Diabetic nephropathy was induced in rats by intraperitoneal injection of 1% streptozotocin. Before and the 1st day, 4th, 8th and 12th week after the induction, random blood glucose (RBG) and 24-hour urinary micro-albumin were detected in different groups. At the 12th week, the rats were sacrificed to collect the blood samples and renal tissues. The contents of blood urea nitrogen (BUN) and serum creatinine (SCr) were detected and the pathological change in renal tissues was observed by light microscope; the level of sP-selectin was detected by enzyme-linked immunosorbent assay and the expression of P-selectin protein in renal tissues was measured by immunohistochemical method. RESULTS: Compared with the normal control group, RBG, 24-hour urinary micro-albumin, the contents of BUN, sP-selectin in serum and expression of P-selectin protein in renal tissue in the untreated group were significantly increased (P<0.01), the content of SCr was significantly decreased (P<0.01), and pathological change of renal tissues was also obvious. Compared with the untreated group, 24-hour urinary micro-albumin, the level of sP-selectin in serum and expression P-selectin protein in renal tissue of the three VOMBP-treated groups were all significantly decreased (P<0.01), and pathological change was lessened too. However, there were no significant differences among the three VOMBP-treated groups (P>0.05). CONCLUSION: VOMBP can protect the kidney in rats with diabetic nephropathy by inhibiting the expressions of P-selectin protein in serum and in renal tissue.