目的从短尾蝮蛇毒中分离纯化一种抗凝蛋白,并对其生化性质进行研究。方法利用阳、阴离子交换、凝胶过滤的方法分离纯化这种抗凝蛋白,用活化部分凝血活酶时间(APTT)测定其抗凝活性,用SDS-PAGE测定其蛋白相对分子量,用等电聚焦法测定蛋白...目的从短尾蝮蛇毒中分离纯化一种抗凝蛋白,并对其生化性质进行研究。方法利用阳、阴离子交换、凝胶过滤的方法分离纯化这种抗凝蛋白,用活化部分凝血活酶时间(APTT)测定其抗凝活性,用SDS-PAGE测定其蛋白相对分子量,用等电聚焦法测定蛋白的等电点.用薄层析方法确定抗凝蛋白与磷脂酰胆碱结合。结果从短尾蝮蛇中分离纯化出的抗凝蛋白是二聚体,相对分子量为24.0×103(非还原)和14.6×103(还原)。等电点为pH 5.2。该蛋白具有精氨酸酯酶活性,能明显地延长活化的部分凝血活酶时间(APTT),其抗凝活性与磷脂结合有关。结论此方法成功地从短尾蝮蛇毒中纯化出一种抗凝蛋白。因其能够与磷脂结合,又具有明显的抗凝活性,因此把该蛋白称为磷脂结合抗凝蛋白(phospholip id-b ind ing anticoagu lation prote in,PBAP)。展开更多
Objective To study the protective effects of naja naja atra venom （NNAV） in a rat model of diabetic nephropathy （DN）. Methods The rat diabetes model was induced by intraperitoneal injection of streptozotocin （STZ...Objective To study the protective effects of naja naja atra venom （NNAV） in a rat model of diabetic nephropathy （DN）. Methods The rat diabetes model was induced by intraperitoneal injection of streptozotocin （STZ）. Thirty-two model rats were randomly divided into one DN group （n=8） and three treatment groups （n=8 each） that received NNAV at doses of 30, 90, or 270 I^g/（ks.day） via oral gavage, another eight rats as normal controls. After 12 weeks, all rats were sacrificed and the changes in serum and urine biological index levels were determined by colorimetric assay. Microalbumin （mALB）, N-acetyl-13- glucosaminidase （NAG） and cystatin C （CysC） concentrations were measured by ELISA. Renal tissues were sliced for pathological and immunohistochemical observations. Results Comparied with the DN group, serum glucose was decreased by 31.04%, total cholesterol 21.96%, triglyceride 23.78%, serum creatinine 19.83%, blood urea nitrogen 31.28%, urinary protein excretion 45.42%, mALB 10.42%, NAG 20.65%, CysC 19.57%, whereas albumin increased by 5.55%, high-density lipoprotein-cholesterol 59.09%, creatinine clearance 19.05% in the treatment group by NNAV administration at dose of 90 μg/（kg-day）. NNAV also reduced the levels of malondialdehyde in serum （22.56%） and kidney tissue （9.79%）, and increased superoxide dismutase concentration in serum （15%） and decreased it in renal tissue （8.85%）. In addition, under light microscopy kidney structure was improved and glomerular hypertrophy decreased by 8.29%. As shown by immunohistochemistry, NNAV inhibited transforming growth factorl by 6.70% and nuclear actor-KB by 5.15%.展开更多
文摘目的从短尾蝮蛇毒中分离纯化一种抗凝蛋白,并对其生化性质进行研究。方法利用阳、阴离子交换、凝胶过滤的方法分离纯化这种抗凝蛋白,用活化部分凝血活酶时间(APTT)测定其抗凝活性,用SDS-PAGE测定其蛋白相对分子量,用等电聚焦法测定蛋白的等电点.用薄层析方法确定抗凝蛋白与磷脂酰胆碱结合。结果从短尾蝮蛇中分离纯化出的抗凝蛋白是二聚体,相对分子量为24.0×103(非还原)和14.6×103(还原)。等电点为pH 5.2。该蛋白具有精氨酸酯酶活性,能明显地延长活化的部分凝血活酶时间(APTT),其抗凝活性与磷脂结合有关。结论此方法成功地从短尾蝮蛇毒中纯化出一种抗凝蛋白。因其能够与磷脂结合,又具有明显的抗凝活性,因此把该蛋白称为磷脂结合抗凝蛋白(phospholip id-b ind ing anticoagu lation prote in,PBAP)。
基金supported by the Research Project of the Jiangsu Province Key Provincial Talents Program,RC2011112
文摘Objective To study the protective effects of naja naja atra venom （NNAV） in a rat model of diabetic nephropathy （DN）. Methods The rat diabetes model was induced by intraperitoneal injection of streptozotocin （STZ）. Thirty-two model rats were randomly divided into one DN group （n=8） and three treatment groups （n=8 each） that received NNAV at doses of 30, 90, or 270 I^g/（ks.day） via oral gavage, another eight rats as normal controls. After 12 weeks, all rats were sacrificed and the changes in serum and urine biological index levels were determined by colorimetric assay. Microalbumin （mALB）, N-acetyl-13- glucosaminidase （NAG） and cystatin C （CysC） concentrations were measured by ELISA. Renal tissues were sliced for pathological and immunohistochemical observations. Results Comparied with the DN group, serum glucose was decreased by 31.04%, total cholesterol 21.96%, triglyceride 23.78%, serum creatinine 19.83%, blood urea nitrogen 31.28%, urinary protein excretion 45.42%, mALB 10.42%, NAG 20.65%, CysC 19.57%, whereas albumin increased by 5.55%, high-density lipoprotein-cholesterol 59.09%, creatinine clearance 19.05% in the treatment group by NNAV administration at dose of 90 μg/（kg-day）. NNAV also reduced the levels of malondialdehyde in serum （22.56%） and kidney tissue （9.79%）, and increased superoxide dismutase concentration in serum （15%） and decreased it in renal tissue （8.85%）. In addition, under light microscopy kidney structure was improved and glomerular hypertrophy decreased by 8.29%. As shown by immunohistochemistry, NNAV inhibited transforming growth factorl by 6.70% and nuclear actor-KB by 5.15%.
