本实验研究了慢性氟中毒对大鼠泌乳及垂体催乳素(Prolactin,PRL)细胞功能和超微结构的影响。结果为:1,慢性氟中毒抑制大鼠乳汁分泌,表现为仔鼠生长缓慢和30 min 平均吮得乳量降低。多巴胺受体阻断剂灭吐灵(Metoclopramide)可改善其泌乳...本实验研究了慢性氟中毒对大鼠泌乳及垂体催乳素(Prolactin,PRL)细胞功能和超微结构的影响。结果为:1,慢性氟中毒抑制大鼠乳汁分泌,表现为仔鼠生长缓慢和30 min 平均吮得乳量降低。多巴胺受体阻断剂灭吐灵(Metoclopramide)可改善其泌乳功能 2,慢性氟中毒授乳鼠血清 PRL 水平降低而垂体内含量升高。电镜下观察到 PRL 细胞质内大的成熟分泌颗粒增多及出现特大异形颗粒,表明可能存在激素释放障碍。上述结果提示慢性氟中毒可抑制大鼠的乳汁分泌,氟化物的毒性作用可能由下丘脑多巴胺系统活动的增强所中介。展开更多
The animal models of subacute and chronic fluorosis were devel-oped with injection of large doses of NaF (IP)and drinking water containing100 ppm F^- in female rats respectively. Serotonin content and turnover rate in...The animal models of subacute and chronic fluorosis were devel-oped with injection of large doses of NaF (IP)and drinking water containing100 ppm F^- in female rats respectively. Serotonin content and turnover rate inhypothalamus of rat were determined with spectrofluorometry combined degra-dation blockade. 5-HT turnover rate in hypothalamus decreased during bothsubacute and chronic fluorosis. 5-HT content in hypothalamus increased duringsubacute fluorosis, but decreased during chronic fluorosis. These results suggestthat the influences on 5-HT metabolism of two kinds of fluorosis are not com-pletely identical. The decrease of 5-HT turnover rate in hypothalamus may be one of thepossible mechanisms of deficiency of pituitary prolactin and milk secretion dur-ing fluorosis.展开更多
文摘本实验研究了慢性氟中毒对大鼠泌乳及垂体催乳素(Prolactin,PRL)细胞功能和超微结构的影响。结果为:1,慢性氟中毒抑制大鼠乳汁分泌,表现为仔鼠生长缓慢和30 min 平均吮得乳量降低。多巴胺受体阻断剂灭吐灵(Metoclopramide)可改善其泌乳功能 2,慢性氟中毒授乳鼠血清 PRL 水平降低而垂体内含量升高。电镜下观察到 PRL 细胞质内大的成熟分泌颗粒增多及出现特大异形颗粒,表明可能存在激素释放障碍。上述结果提示慢性氟中毒可抑制大鼠的乳汁分泌,氟化物的毒性作用可能由下丘脑多巴胺系统活动的增强所中介。
基金The Project Supported by National Natural Science Foundation of China
文摘The animal models of subacute and chronic fluorosis were devel-oped with injection of large doses of NaF (IP)and drinking water containing100 ppm F^- in female rats respectively. Serotonin content and turnover rate inhypothalamus of rat were determined with spectrofluorometry combined degra-dation blockade. 5-HT turnover rate in hypothalamus decreased during bothsubacute and chronic fluorosis. 5-HT content in hypothalamus increased duringsubacute fluorosis, but decreased during chronic fluorosis. These results suggestthat the influences on 5-HT metabolism of two kinds of fluorosis are not com-pletely identical. The decrease of 5-HT turnover rate in hypothalamus may be one of thepossible mechanisms of deficiency of pituitary prolactin and milk secretion dur-ing fluorosis.
