孕鼠高血糖对胎鼠胰岛功能的影响

目的　探讨孕鼠高血糖对胎鼠胰岛β细胞分泌胰岛素功能的影响。方法　２８ 只妊娠 Ｓ Ｄ 大鼠随机分成两组,实验组在妊娠晚期持续性静脉输注高渗葡萄糖;对照组同期输注无菌蒸馏水。采用胎鼠胰岛细胞进行胰岛素抽提实验、胰岛素释放试验及灌流试验,研究胎鼠胰岛β细胞功能的变化。结果　实验组胎鼠每个胰腺内胰岛素平均水平为（３ ３２９ ．８１ ±１６３ ．３９）ｎｇ;单位重量胰腺组织胰岛素水平为（１５８ ．５６ ±２３ ．３４）ｎｇ／ｍｇ。对照组胎鼠胰腺内胰岛素平均水平为（２ ３９０ ．０４ ±１５１ ．３９）ｎｇ ;单位重量胰腺组织胰岛素水平为（１２５ ．７９ ±１７ ．９７）ｎｇ／ｍｇ 。两者比较,差异有显著性（ Ｐ＜ ０ ．０５） 。在低糖或高糖 Ｈａｎｋｓ 液中温育胰腺组织２ 小时,实验组胎鼠胰岛素释放量：低糖时为（２４ ．２２ ±４ ．６３）ｎｇ／ｍｇ ;高糖时为（７３ ．７３ ±５ ．９４）ｎｇ／ｍｇ 。对照组胎鼠胰岛素释放量：低糖时为（２０ ．５２ ±２ ．３１）ｎｇ／ｍｇ ;高糖时为（５３ ．３５ ±７ ．５３）ｎｇ／ｍｇ 。两组比较,差异有显著性（ Ｐ＜ ０ ．０５） 。在胰岛素灌流试验中,实验组胎鼠胰岛素分泌时相高峰出现早且峰值高于对照组。结论

Influences of gestational hyperglycemia on the function of fetal rat pancreatic islets

OBJECTIVE: To investigate the influences of gestational hyperglycemia on the function of fetal rat pancreatic islets. METHODS: Twenty-eight pregnant SD rats were randomly allocated into two groups. The study group was continually infused with 30% glucose at the rate of 2 ml/min, while the controls with sterilized distilled water in the same time and at the same rate. The infusion began on day 16.5 post-coitus and lasted for 5 days until the removal of the fetuses. The functions of the beta-cells in fetal rat islets were studied by determining the content of insulin, using the tests of extracting, releasing and perfusing. RESULTS: The data showed that the insulin content of study group (3,329.81 +/- 163.39) ng was significantly higher than that of controls (2,390.04 +/- 151.39) ng (P < 0.05); After 2 hours' incubation in Hanks solution which contained different concentration of glucose, increased insulin secretion was found in the study group (P < 0.05); When the islets were perfused, the insulin peak value of study group was higher and appeared earlier than that of controls. CONCLUSION: Insulin synthesis and secretion function of beta-cells of fetal pancreas from hyperglycemia rats were enhanced and the pancreas had a hypersensitive response to glucose challenge.