Article (Scientific journals)
Effect of cyclo-oxygenase inhibition on embryonic microglia and the sexual differentiation of the brain and behavior of Japanese quail (Coturnix japonica)
Delage, Charlotte; Nys, Gwenaël; Fillet, Marianne et al.
2021In Hormones and Behavior, 134, p. 105024
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Keywords :
PGE2; male sexual behavior; microglia; sex differences; prostanoids
Abstract :
[en] Enduring sex differences in the brain are established during a developmental process known as brain sexual differentiation and are mainly driven by estrogens during a critical period. In rodents, the masculinization of the preoptic area by estrogens derived from the central aromatization of testosterone depends in part on the interaction between microglia and prostaglandin E2 (PGE2), a pro-inflammatory hormone of the prostanoid subclass. In contrast, in birds, estrogens produced by females induce a demasculinization, but whether an interaction with the neuro-immune system is involved in this process is unknown. This study addressed this question by testing the effects of blockade of cyclo-oxygenases (COX), the rate-limiting enzymes for prostanoid synthesis, on embryonic microglia and the sexual differentiation of brain and behavior using the Japanese quail as an animal model. The results show that COX inhibition does not affect the behavior of females, but impairs male sexual behavior and suppresses the sex difference in microglial profiles at embryonic day 12 (E12) in the medial preoptic nucleus by increasing the number of microglia in males only. However, neither prostanoid concentrations nor PGE2 receptors differed between sexes in the hypothalamus and preoptic area (HPOA) during development. Overall, these results uncovered a potential role of prostanoids in the demasculinization of Japanese quail. Moreover, the parallel effect of COX inhibition on behavior and microglia suggests an interaction between prostanoids and microglia in brain demasculinization, thus fueling the hypothesis of a conserved role of the neuroimmune system in the organization of the brain by estrogens.
Research center :
Giga-Neurosciences - ULiège
Disciplines :
Neurosciences & behavior
Author, co-author :
Delage, Charlotte ;  Université de Liège - ULiège > GIGA
Nys, Gwenaël ;  Université de Liège - ULiège > CIRM
Fillet, Marianne  ;  Université de Liège - ULiège > Département de pharmacie > Analyse des médicaments
Cornil, Charlotte  ;  Université de Liège - ULiège > GIGA Neurosciences - Neuroendocrinology
Language :
English
Title :
Effect of cyclo-oxygenase inhibition on embryonic microglia and the sexual differentiation of the brain and behavior of Japanese quail (Coturnix japonica)
Publication date :
2021
Journal title :
Hormones and Behavior
ISSN :
0018-506X
eISSN :
1095-6867
Publisher :
Elsevier, Atlanta, United States - California
Volume :
134
Pages :
105024
Peer reviewed :
Peer Reviewed verified by ORBi
Funders :
F.R.S.-FNRS - Fonds de la Recherche Scientifique [BE]
ULiège - Université de Liège [BE]
Fondation Léon Fredericq [BE]
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since 07 July 2021

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