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In vitro effects of gonadotropin-releasing hormone (GnRH) on Leydig cells of adult alpaca (Lama pacos) testis: GnRH receptor immunolocalization, testosterone and prostaglandin synthesis, and cyclooxygenase activities.
MedLine Citation:
PMID:  20961724     Owner:  NLM     Status:  In-Process    
Abstract/OtherAbstract:
The main objective of this study was to examine the modulatory in vitro effects of gonadotropin-releasing hormone (GnRH) on isolated Leydig cells of adult alpaca (Lama pacos) testis. We first evaluated the presence of GnRH receptor (GnRHR) and cyclooxygenase (COX) 1 and COX2 in alpaca testis. We then studied the in vitro effects of buserelin (GnRH analogue), antide (GnRH antagonist), and buserelin plus antide or inhibitor of phospholipase C (compound 48/80) and COXs (acetylsalicylic acid) on the production of testosterone, PGE(2), and PGF(2α) and on the enzymatic activities of COX1 and COX2. Immunoreactivity for GnRHR was detected in the cytoplasm of Leydig cells and in the acrosomal region of spermatids. COX1 and COX2 immunosignals were noted in the cytoplasm of spermatogonia, spermatocytes, spermatids, Leydig cells, and Sertoli cells. Western blot analysis confirmed the GnRHR and COX1 presence in alpaca testis. The in vitro experiments showed that buserelin alone increased (P < 0.01) and antide and buserelin plus acetylsalicylic acid decreased (P < 0.01) testosterone and PGF(2α) production and COX1 activity, whereas antide and compound 48/80 counteracted buserelin effects. Prostaglandin E(2) production and COX2 activity were not affected by buserelin or antide. These data suggest that GnRH directly up-regulates testosterone production in Leydig cells of adult alpaca testis with a postreceptorial mechanism that involves PLC, COX1, and PGF(2α).
Authors:
M Zerani; G Catone; L Quassinti; E Maccari; M Bramucci; A Gobbetti; M Maranesi; C Boiti; F Parillo
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Publication Detail:
Type:  Journal Article     Date:  2010-09-28
Journal Detail:
Title:  Domestic animal endocrinology     Volume:  40     ISSN:  1879-0054     ISO Abbreviation:  Domest. Anim. Endocrinol.     Publication Date:  2011 Jan 
Date Detail:
Created Date:  2010-11-26     Completed Date:  -     Revised Date:  -    
Medline Journal Info:
Nlm Unique ID:  8505191     Medline TA:  Domest Anim Endocrinol     Country:  United States    
Other Details:
Languages:  eng     Pagination:  51-9     Citation Subset:  IM    
Copyright Information:
Copyright © 2011 Elsevier Inc. All rights reserved.
Affiliation:
Scuola di Scienze Mediche Veterinarie, Università di Camerino, I-62024 Matelica, Italy. massimo.zerani@unicam.it
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