Immunoelectron microscopic study of the luminal release of serotonin from rat enterochromaffin cells induced by high intraluminal pressure

被引:92
作者
Fujimiya, M
Okumiya, K
Kuwahara, A
机构
[1] KOCHI MED SCH,DEPT GERIATR,NANKOKU,KOCHI 783,JAPAN
[2] UNIV SHIZUOKA,GRAD SCH NUTR & ENVIRONM SCI,ENVIRONM PHYSIOL LAB,SHIZUOKA 422,JAPAN
关键词
D O I
10.1007/s004180050151
中图分类号
Q2 [细胞生物学];
学科分类号
071009 ; 090102 ;
摘要
Since definitive morphological studies showing the luminal release of serotonin have not been reported, we used a perfused system which allows physiological monitoring and biochemical as well as morphological evidence indicating release of serotonin from enterochromaffin cells. Isolated vascularly and luminally perfused rat duodenums exposed to 5-35 cmH(2)O of luminal pressure were measured for release of serotonin into the blood vessels and intestinal lumen. Immediately after raising the luminal pressure, the duodenum was fixed for immunoelectron microscopic localization of serotonin. Peristaltic contraction and serotonin content of the perfusates were continuously measured. The luminal release of serotonin increased with elevated intraluminal pressure, but the vascular release of serotonin was not altered. Tetrodotoxin had no effect on the pressure-stimulated luminal serotonin release. Enterochromaffin cells in control animals without increased luminal pressure contained immunogold-labeled secretory granules in the apical and basal cytoplasm. After intraluminal pressure increased, many apical secretory granules were no longer dense and immunogold particles were localized over the cytoplasmic matrix and microvilli. These findings indicate that luminal serotonin release is increased after raising the intraluminal pressure and serotonin, normally stored in the secretory granules of enterochromaffin cells, appears to be released into the cytoplasmic matrix and then diffuses or is transported into the intestinal lumen.
引用
收藏
页码:105 / 113
页数:9
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