摘要
目的 :通过观察人甲状旁腺素 (hPTH1 3 4 )及其聚乙二醇修饰物对鸡血钙含量的影响判断它们的体内活性。方法 :12日龄的小鸡分别翼静脉注射赋形剂 ,hPTH1 3 4 ,Cys(mPEG50 0 0 MAL) hPTH1 3 4 和hPTH1 3 4 Cys(mPEG50 0 0 MAL) NH2 。 6 0min和 12 0min后翼静脉采血 ,分离血清并测定钙含量。结果 :给药后 6 0min ,hPTH1 3 4 ,Cys(mPEG50 0 0 MAL) hPTH1 3 4 和hPTH1 3 4 Cys(mPEG50 0 0 MAL) NH2 组静脉血清钙含量均明显升高 ;12 0min后 ,Cys(mPEG50 0 0 MAL) hPTH1 3 4 组血清钙含量仍维持升高水平 ,而hPTH1 3 4 和hPTH1 3 4 Cys(mPEG50 0 0 MAL) NH2 组血清钙含量则明显回落。结论 :合成人甲状旁腺素 (hPTH1 3 4 )及其聚乙二醇修饰物可以明显升高小鸡的血清钙水平 ;N端聚乙二醇修饰的hPTH1 3 4 维持血钙升高的时间较长。
Objective: To study the effect of human parathyroid hormones(1-34)(hPTH 1-34) and its pegylation on plasma calcium of chicks. Methods: Chicks(12 days old) were injected via wing veins with hPTH 1-34,Cys(mPEG 5000-MAL)-hPTH 1-34or hPTH 1-34-Cys(mPEG 5000-MAL)-NH 2 at a dose of 10 U/chick, respectively and bled 60 or 120 min later. The plasma calcium levels of serum samples were measured. Results: Sixty minutes after i.v. injection, the serum calcium levels were raised significantly in all three groups. Two hour after i.v. injection it was observed that the raised plasma calcium level was still retained only in the Cys(mPEG 5000-MAL)-hPTH 1-34 group. Conclusion: hPTH 1-34,Cys(mPEG 5000-MAL)-hPTH 1-34 and hPTH 1-34-Cys(mPEG 5000-MAL)-NH 2 could cause the hypercalcemic response of chicks. The effect of Cys(mPEG 5000-MAL)-hPTH 1-34 lasted longer than that of the others.
出处
《军事医学科学院院刊》
CSCD
北大核心
2004年第6期542-543,共2页
Bulletin of the Academy of Military Medical Sciences