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Blood glucose lowering assay proved that [B16Ala]insulin and [B26Ala]insulin exhibit potency of acute blood glucose lowering in normal pigs, which demonstrates that they are fast- acting insulin. Single-chain precursor of [B16Ala]insulin and [B26Ala]insulin is [B16Ala]PIP and [B26Ala]PIP, respectively, which are suitable for gene expression. Secretory expression level of the precursors in methylotrophic yeast Pichia pastoris was quite high, 650 mg/L and 130 mg/L, respectively. In vivo biological assay showed that the two fast-acting insulins have full or nearly full biological activity. So both [B16Ala]insulin and [B26Ala]insulin can be well developed as fast-acting insulin for clinic use. 相似文献
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胰岛素和胰岛素突变体促进大鼠脂肪细胞摄取葡萄糖 总被引:1,自引:0,他引:1
报道了大鼠脂肪细胞摄取葡萄糖测定胰岛素体外活性的简便方法 .在胰岛素存在下 ,脂肪细胞摄取葡萄糖的量比对照增加 5~ 6倍 .当胰岛素浓度在 0 .2~ 1 0μg/L时 ,脂肪细胞摄取D [3 3H] 葡萄糖的量与胰岛素浓度对数呈线性关系 .葡萄糖和 3 O 甲基葡萄糖抑制指脂肪细胞摄取D [3 3H]葡萄糖 .利用这一方法测定了[B2 Lys] 胰岛素和 [B3 Lys] 胰岛素的体外活力 ,分别为胰岛素的 6 1.6 %和 154% . 相似文献
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本文报道了胰岛素分子中B1~3序列(Phe-Val-Asn)为Ala-Ala-Lys取代的胰岛素类似物制备及其生物性质。[B1Ala,B2Ala,B3Lys]-胰岛素仍保留天然胰岛素的全部体内活性和受体结合能力,但体外促脂肪生成活性和免疫活性分别只为胰岛素的70%和0.88%。本文还就胰岛素B链N端肽段对其结构和功能的影响进行了讨论。 相似文献
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A simple method to determine the in vitro biological activity of insulin by measuring glucose uptake in the rat adipocytes is presented here. In the presence of insulin, the glucose uptake is 5-6 times more than the basal control. And the uptake of D-[3-3H]-glucose is linear as the logarithm of insulin concentration from 0.2 μg/L to 1.0 μg/L. Glucose and 3-O-methyl-glucose inhibit D-[3-3H]-glucose uptake into adipocytes. By this method, the in vitro biological activity of [B2-Lys]-insulin and [B3-Lys]-insulin was measured to be 61.6% and 154% respectively, relative to that of insulin. 相似文献
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Insulin has been successfully used in clinic treatment of diabetes for more than 80 years. However, the clinic practice has shown that regular insulin preparation used in clinic exhibits several intrinsic problems that have existed for a long time. One of the major problems is that insulin has a potency of self-association when its concentration is higher than physiological concentration (10-8—10-10 mol/L)[1,2]. The concentration of the regular insulin is higher than 10-4 mol/L. At such a hi… 相似文献
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