Does GPER1 Play a Role in Sexual Dimorphism?

Area of Science:

• Neuroendocrinology
• Behavioral Neuroscience
• Molecular Endocrinology

Background:

• Estrogens are crucial for sex-typical social behaviors in mammals, mediated by signaling within the sexually dimorphic social behavioral network (SBN).
• 17β-estradiol signals via classical genomic pathways involving intracellular estrogen receptors (ERα, ERβ) and non-classical rapid pathways potentially involving membrane estrogen receptors (mERs) like GPER1.
• While GPER1's role in cardiovascular physiology is studied, its function in the brain, particularly concerning sexually dimorphic behaviors, remains less understood.

Purpose of the Study:

• To review mechanisms underlying sexually dimorphic behaviors related to estrogen signaling in the SBN.
• To explore the colocalization and interplay of estrogen receptors (ERα, ERβ, GPER1) within the SBN.
• To discuss the underexplored roles of these receptors in the development and maintenance of the SBN.

Main Methods:

• Review of existing literature on estrogen signaling pathways (genomic and non-genomic).
• Analysis of studies investigating estrogen receptors (ERα, ERβ, GPER1) in the context of social behavior and sexual dimorphism.
• Focus on the social behavioral network (SBN) as a key neuroanatomical substrate.

Main Results:

• Estrogen signaling, via both genomic and rapid pathways, is fundamental to mammalian social behaviors.
• Estrogen receptors (ERα, ERβ, GPER1) exhibit complex interactions and localization within the SBN.
• GPER1 activation is implicated in female-specific behaviors like lordosis and social cognition.

Conclusions:

• Understanding the interplay between different estrogen receptor signaling pathways is critical for elucidating sexually dimorphic behaviors.
• Further research into the developmental and maintenance roles of estrogen receptors in the SBN is warranted.
• Estrogen receptor signaling in the SBN offers potential insights into the neurobiological basis of social behavior.