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5-HT AND 5-HTR2-LIKE IMMUNOREACTIVE CELLS IN INTESTINE AND HEPATOPANCREAS OF CHINESE MITTEN CRAB ERIOCHEIR SINENSIS
Author(s): 
Pages: 1139-1145
Year: Issue:  5
Journal: Oceanologia et Limnologia Sinica

Keyword:  5-hydroxytryptamine5-HT receptor2Eriocheir sinensisintestinehepatopancreas;
Abstract: To understand the digestive physiology of the intestine and hepatopancreas, we measured the lengths of midgut and hindgut of Eriocheir sinensis, analysed the correlation between intestine length and body length, and observed the immunolocation of 5-hydroxytryptamine(5-HT) and 5-HT receptor2(5-HTR2) positive cells in these organs by immunohistochemical method. Results show that the length of intestine was similar to that of body, and the correlation between the lengths of intestine and body was significant(P<0.01). The length of hindgut was about two-fold of the length of midgut. The distribution and number of 5-HT and 5-HTR2 positive cells in midgut were similar to those of hindgut. 5-HT and 5-HTR2 immunoreactive cells distributed mainly among the epithelium of the intestinal mucosa and between muscle layer and tunica adventitia of midgut and hindgut. These immunoreactive cells were also detected in lamina propria and between submucosa and muscle layer of hindgut and tunica adventitia of intestine ball. In addition, 5-HT and 5-HTR2 were also localized in the nuclei of four hepatopancreas cells(including E-, R-, F-, and B-cell). Among these hepatopancreas cells, the nuclei and cytoplasm of F-cell showed strong 5-HT and 5-HTR2 reaction. These findings indicate, for the first time to our knowledge, a probable close link between 5-HT and 5-HTR2 in E. sinensis digestive system, and 5-HT and 5-HTR2 immunoreactive cells that reside adjacent to intestinal smooth muscle might be involved in the regulation of the contractile state of intestinal smooth muscle. Therefore, the digestive physiology of E. sinensis hindgut should be paid with more attention.
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