Distribution of ghrelin-like immunoreactive cells in amphioxus,Branchiostoma belcheri-A study of immunohistochemistry  

作　　者：You-Zhu Weng Hai-Xia Song Yong-Qiang Fang 

机构地区：[1]The Third Institute of Oceanography of the State Oceanic Administration, Xiamen 361005, China

出　　处：《Progress in Natural Science:Materials International》2008年第2期245-249,共5页自然科学进展·国际材料（英文版）

基　　金：2007 National Natural Science Foundation of China ; Chinese Academy of Sciences;National Natural Science Foundation of China （Grant Nos. 30470224, 40576075）.

摘　　要：The distribution of ghrelin-like immunoreactive cells in amphioxus (Branchiostoma belcheri) was investigated by using immunohisto-chemical staining with rabbit antiserum against synthetical mammalian ghrelin. The results showed that ghrelin-like immunoreactive cells were distributed widely in the nervous system,Hatschek's pit,wheel organ,digestive tract and gonads (ovary and testis). In nervous system,ghrelin-like immunoreactive neurons and their protrusions were distributed specifically on the dorsal side,ventral side and funnel part of brain vesicle,with a few dispersive immunoreactive nerve cells and their fibers in nerve tube. Ghrelin-like immunoreactivities were also detected in Hatschek's pit epithelial cells and wheel organ cells,with positive substance located along cell membrane. In digestive tract,ghrelin-like immunoreactive cells existed in hepatic diverticulum,anterior and posterior region of midgut,and could be classified into two types,closed-and opened-type endocrine cells. The number of positive cells was most in hepatic diverticulum,secondary in posterior region of midgut and least in anterior region of midgut. In gonads,ghrelin-like immunoreactive substance was detected in oogonia,oocytes and follicle cells in ovary at the small and large growth stages and in early spermatogenic cells and Sertoli cells in testis. The extensive distribution of ghrelin-like cells in amphioxus suggested that these kinds of cells are conservative in evolution and diver-sified in function. At the same time,we found for the first time that ghrelin-like immunoreactive cells existed in brain vesicle and Hat-schek's pit,which provided new morphological evidence for the existence of an activation pathway between brain vesicle and Hatschek's pit for the regulation of growth hormone excretion.The distribution of ghrelin-like immunoreactive cells in amphioxus （Branchiostoma belcheri） was investigated by using immunohistochemical staining with rabbit antiserum against synthetical mammalian ghrelin. The results showed that ghrelin-like immunoreactive cells were distributed widely in the nervous system, Hatschek＇s pit, wheel organ, digestive tract and gonads （ovary and testis）. In nervous system, ghrelin-like immunoreactive neurons and their protrusions were distributed specifically on the dorsal side, ventral side and funnel part of brain vesicle, with a few dispersive immunoreactive nerve cells and their fibers in nerve tube. Ghrelin-like immunoreactivities were also detected in Hatschek＇s pit epithelial cells and wheel organ cells, with positive substance located along cell membrane. In digestive tract, ghrelin-like immunoreactive cells existed in hepatic diverticulum, anterior and posterior region of midgut, and could be classified into two types, closed- and opened-type endocrine cells. The number of positive cells was most in hepatic diverticulum, secondary in posterior region of midgut and least in anterior region of midgut. In gonads, ghrelin-like immunoreactive substance was detected in oogonia, oocytes and follicle cells in ovary at the small and large growth stages and in early spermatogenic cells and Sertoli cells in testis. The extensive distribution of ghrelin-like cells in amphioxus suggested that these kinds of cells are conservative in evolution and diversified in function. At the same time, we found for the first time that ghrelin-like immunoreactive cells existed in brain vesicle and Hatschek＇s pit, which provided new morphological evidence for the existence of an activation pathway between brain vesicle and Hatschek＇s pit for the regulation of growth hormone excretion.

关 键 词：GHRELIN AMPHIOXUS Nervous system Hatschek＇s pit Digestive tract GONAD 

分 类 号：S96[农业科学—水产养殖]