Journal
HORMONES AND BEHAVIOR
Volume 66, Issue 4, Pages 628-636Publisher
ACADEMIC PRESS INC ELSEVIER SCIENCE
DOI: 10.1016/j.yhbeh.2014.09.001
Keywords
G-protein coupled estrogen receptor; Emotional control; Anxiety; Stress coping; Estrous cycle; Corticosterone
Categories
Funding
- Austrian Science Fund [I-977]
- Austrian Science Fund (FWF) [I977] Funding Source: Austrian Science Fund (FWF)
- Austrian Science Fund (FWF) [I 977] Funding Source: researchfish
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The putative estrogen receptor GPER1 (the former orphan receptor GPR30) is discussed to be involved in emotional and cognitive functions and stress control. We recently described the induction of anxiety-like effects by the GPER1 agonist G-1 upon systemic injection into mice. To contribute to a better understanding of the role of GPER1 in anxiety and stress, we investigated germ-line GPER1 deficient mice. Our experiments revealed marked differences between the sexes. A mild but consistent phenotype of increased exploratory drive was observed in the home cage, the elevated plus maze and the light-dark choice test in male GPER1 KO mice. In contrast, female GPER1-KO mice displayed a less pronounced phenotype in these tests. Estrous-stage dependent mild anxiolytic-like effects were observed solely in the open field test. Notably, we observed a strong shift in acute stress coping behavior in the tail suspension test and basal corticosterone levels in different phases of the estrous cycle in female GPER1-KO mice. Our data, in line with previous reports, suggest that GPER1 is involved in anxiety and stress control. Surprisingly, its effects appear to be stronger in male than female mice. (C) 2014 The Authors. Published by Elsevier Inc.
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