Document Detail


Galanin in adrenocorticotropic hormone cells is decreased by castration.
MedLine Citation:
PMID:  21975846     Owner:  NLM     Status:  Publisher    
Abstract/OtherAbstract:
Galanin (GAL) is a neuropeptide that is widely expressed in neuroendocrine tissues, including the adenohypophysis. Since GAL is expressed at higher levels in females, little attention has been paid to the regulation of GAL secretion in males. Here, we show that testosterone regulates GAL secretion in the adenohypophysis of male rats. Using double immunoelectron microscopy, we demonstrate that GAL cells possess three types of secretory granule: those with colocalization of GAL and adrenocorticotropic hormone (ACTH), those with GAL only, and those with ACTH only. The predominant granule type was that containing both GAL and ACTH, suggesting that GAL and ACTH are secreted at the same time. Indeed, adrenalectomy induced an acute decrease in the number of both GAL cells and ACTH cells. In contrast, castration resulted in a decrease in the proportion of GAL cells, while the proportion of ACTH cells remained unchanged. In addition, ACTH-strongly positive and GAL-positive cells were decreased while ACTH-weakly positive and GAL-negative cells were increased after castration. Testosterone treatment of castrated animals resulted in restoration of these levels to those of intact and sham operated animals. These results indicated that testosterone regulates GAL secretion in male animals.
Authors:
Takahiro Sato; Takahiro Yamaguchi
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Publication Detail:
Type:  JOURNAL ARTICLE     Date:  2011-10-6
Journal Detail:
Title:  Cell and tissue research     Volume:  -     ISSN:  1432-0878     ISO Abbreviation:  -     Publication Date:  2011 Oct 
Date Detail:
Created Date:  2011-10-6     Completed Date:  -     Revised Date:  -    
Medline Journal Info:
Nlm Unique ID:  0417625     Medline TA:  Cell Tissue Res     Country:  -    
Other Details:
Languages:  ENG     Pagination:  -     Citation Subset:  -    
Affiliation:
Molecular Genetic, Institute of Life Science, Kurume University, Hyakunenn-koen 1-1, Kurume, 839-0864, Japan, satou_takahiro@kurume-u.ac.jp.
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