title: Effect of blockade of mGluR5 on stress hormone release and its gene expression in the adrenal gland.
abstract: The aim of this study was to verify the presence of metabotropic glutamate receptor subtype 5 (mGluR5) in the adrenal gland of male rats of 2 different strains, and to test the hypothesis that treatment with mGluR5 antagonist 2-methyl-6-(phenylethynyl)-pyridine (MPEP) affects hormone release and adrenal gene expression of mGluR5 under conditions of stress. The results clearly show the gene expression of mGluR5 in the adrenal gland in both the adrenal cortex and medulla. Treatment with the glutamate release inhibitor riluzole (4 mg·(kg body mass)(-1)·day(-1) for 2 weeks) failed to modify mRNA levels of either the mGluR5 or NR1 subunit of the NMDA receptor in the adrenal glands, as measured by real-time PCR. Blockade of mGluR5 with MPEP (1 mg·kg(-1) for 4 days) increased corticosterone but not catecholamine release during restraint stress (20 min). Treatment with MPEP had no effect on mRNA levels coding for steroidogenic factors StAR and SF-1, and decreased mGluR5 gene expression in the adrenal gland. In conclusion, mGluR5 is not likely to play a significant role in stress-induced catecholamine release. Pharmacological blockade of mGluR5 has a modest influence on the hypothalamic-pituitary-adrenocortical axis, as reflected in adrenal hypertrophy and increased corticosterone concentrations.
authors.affiliation: a Laboratory of Pharmacological Neuroendocrinology, Institute of Experimental Endocrinology, Slovak Academy of Sciences, Vlarska 3, Bratislava 83306, Slovakia.
authors.forename: Michal
authors.initials: M
authors.lastname: Pokusa
authors.forename: Barbora
authors.initials: B
authors.lastname: Prokopova
authors.forename: Natasa
authors.initials: N
authors.lastname: Hlavacova
authors.forename: Aikaterini
authors.initials: A
authors.lastname: Makatsori
authors.forename: Daniela
authors.initials: D
authors.lastname: Jezova
mesh_terms: D000302:Adrenal Cortex / Q000187:drug effects* / Q000378:metabolism; D000313:Adrenal Medulla / Q000187:drug effects* / Q000378:metabolism; D000818:Animals; D003345:Corticosterone / Q000378:metabolism*; D015870:Gene Expression; D008297:Male; D011725:Pyridines / Q000494:pharmacology; D017207:Rats, Sprague-Dawley; D017208:Rats, Wistar; D064529:Receptor, Metabotropic Glutamate 5 / Q000037:antagonists & inhibitors* / Q000378:metabolism; D016194:Receptors, N-Methyl-D-Aspartate / Q000378:metabolism; D012149:Restraint, Physical; D019782:Riluzole / Q000494:pharmacology; D013045:Species Specificity; D013315:Stress, Psychological / Q000378:metabolism* / Q000503:physiopathology
chemical_list: C409466:NR1 NMDA receptor; D011725:Pyridines; D064529:Receptor, Metabotropic Glutamate 5; D016194:Receptors, N-Methyl-D-Aspartate; D019782:Riluzole; C121465:6-methyl-2-(phenylethynyl)pyridine; D003345:Corticosterone
keywords: adrenal gland; facteurs stéroïdogènes; glande surrénale; glutamate receptors; hormones de stress; récepteurs du glutamate; steroidogenic factors; stress; stress hormones