Developmental and hormonal regulation of the monocarboxylate transporter 2 (MCT2) expression in the mouse germ cells

Détails

ID Serval
serval:BIB_98EBEC5D8B75
Type
Article: article d'un périodique ou d'un magazine.
Collection
Publications
Institution
Titre
Developmental and hormonal regulation of the monocarboxylate transporter 2 (MCT2) expression in the mouse germ cells
Périodique
Biology of Reproduction
Auteur(s)
Boussouar  F., Mauduit  C., Tabone  E., Pellerin  L., Magistretti  P. J., Benahmed  M.
ISSN
0006-3363 (Print)
Statut éditorial
Publié
Date de publication
09/2003
Volume
69
Numéro
3
Pages
1069-78
Notes
Journal Article
Research Support, Non-U.S. Gov't --- Old month value: Sep
Résumé
During spermatogenesis, postmeiotic germ cells utilize lactate produced by Sertoli cells as an energy metabolite. While the hormonal regulation of lactate production in Sertoli cells has been relatively well established, the transport of this energy substrate to the germ cells, particularly via the monocarboxylate transporters (MCTs), as well as the potential endocrine control of such a process remain to be characterized. Here, we report the developmentally and hormonally regulated expression of MCT2 in the testis. At Day 18, MCT2 starts to be expressed in germ cells as detected by Northern blot. The mRNA are translated into protein (40 kDa) in elongating spermatids. Ultrastructural analysis demonstrated that MCT2 protein is localized to the outer face of the cell membrane of spermatid tails. MCT2 mRNA levels are under the control of the endocrine, specifically follicle-stimulating hormone (FSH) and testosterone, and paracrine systems. Indeed, a 35-day-old rat hypophysectomy resulted in an 8-fold increase in testicular MCT2 mRNA levels. Conversely, FSH and LH administration to the hypophysectomized rats reduced MCT2 mRNA levels to the basal levels observed in intact animals. The decrease in MCT2 mRNA levels was confirmed in vitro using isolated seminiferous tubules incubated with FSH or testosterone. FSH or testosterone inhibited in a dose-dependent manner MCT2 mRNA levels with maximal inhibitory doses of 2.2 ng/ml and 55.5 ng/ml for FSH and testosterone, respectively. In addition to the endocrine control, TNFalpha and TGFbeta also exerted an inhibitory effect on MCT2 mRNA levels with a maximal effect at 10 ng/ml and 6.6 ng/ml for TGFbeta and TNFalpha, respectively. Together with previous studies, the present data reinforce the concept that among the key functions of the endocrine/paracrine systems in the testis is the control of the energy metabolism occurring in the context of Sertoli cell-germ cell metabolic cooperation where lactate is produced in somatic cells and transported to germ cells via, at least, MCT2.
Mots-clé
Age Factors Animals Energy Metabolism/physiology Follicle Stimulating Hormone/physiology Gene Expression Regulation Immunohistochemistry Male Mice Monocarboxylic Acid Transporters/genetics/*metabolism RNA, Messenger/analysis Rats Sertoli Cells/*metabolism Spermatogenesis/*physiology Spermatozoa/*metabolism/ultrastructure Testis/cytology/metabolism Testosterone/physiology Transforming Growth Factor beta/physiology Tumor Necrosis Factor-alpha/physiology
Pubmed
Web of science
Open Access
Oui
Création de la notice
24/01/2008 14:16
Dernière modification de la notice
20/08/2019 16:00
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