GABA Signaling in the Posterodorsal Medial Amygdala Mediates Stress-induced Suppression of LH Pulsatility in Female Mice.
GABA
LH
MePD
optogenetics
Journal
Endocrinology
ISSN: 1945-7170
Titre abrégé: Endocrinology
Pays: United States
ID NLM: 0375040
Informations de publication
Date de publication:
14 11 2022
14 11 2022
Historique:
received:
31
08
2022
pubmed:
2
12
2022
medline:
21
12
2022
entrez:
1
12
2022
Statut:
ppublish
Résumé
Psychological stress is linked to infertility by suppressing the hypothalamic GnRH pulse generator. The posterodorsal subnucleus of the medial amygdala (MePD) is an upstream regulator of GnRH pulse generator activity and displays increased neuronal activation during psychological stress. The MePD is primarily a GABAergic nucleus with a strong GABAergic projection to hypothalamic reproductive centers; however, their functional significance has not been determined. We hypothesize that MePD GABAergic signalling mediates psychological stress-induced suppression of pulsatile LH secretion. We selectively inhibited MePD GABA neurons during psychological stress in ovariectomized (OVX) Vgat-cre-tdTomato mice to determine the effect on stress-induced suppression of pulsatile LH secretion. MePD GABA neurons were virally infected with inhibitory hM4DGi-designer receptor exclusively activated by designer drugs (DREADDs) to selectively inhibit MePD GABA neurons. Furthermore, we optogenetically stimulated potential MePD GABAergic projection terminals in the hypothalamic arcuate nucleus (ARC) and determined the effect on pulsatile LH secretion. MePD GABA neurons in OVX female Vgat-cre-tdTomato mice were virally infected to express channelrhodopsin-2 and MePD GABAergic terminals in the ARC were selectively stimulated by blue light via an optic fiber implanted in the ARC. DREADD-mediated inhibition of MePD GABA neurons blocked predator odor and restraint stress-induced suppression of LH pulse frequency. Furthermore, sustained optogenetic stimulation at 10 and 20 Hz of MePD GABAergic terminals in the ARC suppressed pulsatile LH secretion. These results show for the first time that GABAergic signalling in the MePD mediates psychological stress-induced suppression of pulsatile LH secretion and suggest a functionally significant MePD GABAergic projection to the hypothalamic GnRH pulse generator.
Identifiants
pubmed: 36453253
pii: 6855642
doi: 10.1210/endocr/bqac197
pmc: PMC9757692
pii:
doi:
Substances chimiques
gamma-Aminobutyric Acid
56-12-2
Gonadotropin-Releasing Hormone
33515-09-2
Luteinizing Hormone
9002-67-9
Types de publication
Journal Article
Research Support, Non-U.S. Gov't
Langues
eng
Sous-ensembles de citation
IM
Subventions
Organisme : Biotechnology and Biological Sciences Research Council
ID : BB/S000550/1
Pays : United Kingdom
Organisme : Biotechnology and Biological Sciences Research Council
ID : BB/W005913/1
Pays : United Kingdom
Commentaires et corrections
Type : CommentIn
Informations de copyright
© The Author(s) 2022. Published by Oxford University Press on behalf of the Endocrine Society.
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