[Corticosteroid receptor and stress].

Area of Science:

• Neuroendocrinology
• Molecular Neuroscience

Context:

• Adrenal corticosteroids are crucial signaling molecules affecting neural functions.
• Two primary receptor systems, mineralocorticoid receptor (MR) and glucocorticoid receptor (GR), mediate these effects.
• Both MR and GR are ligand-dependent transcription factors influencing gene expression.

Purpose:

• To elucidate the distinct roles and localization of MR and GR in the brain.
• To understand how MR and GR affinity for corticosterone/cortisol influences their function under varying physiological and stress conditions.
• To explore the significance of MR and GR interactions in the hippocampus for stress response regulation.

Summary:

• Corticosteroids readily enter the brain, modulating neural cell stress responses via MR and GR.
• MR, highly expressed in the hippocampus, has high corticosterone affinity, dominating physiological conditions.
• GR, distributed widely but also in the hippocampus, has lower affinity, becoming active during high-stress scenarios.
• The colocalization and differential affinity of MR and GR in the hippocampus suggest a complex regulatory mechanism for brain stress response.

Impact:

• Provides insights into the differential regulation of brain function by corticosteroids under physiological and stress states.
• Highlights the hippocampus as a critical brain region for corticosteroid action and stress modulation.
• Establishes a foundation for understanding corticosteroid-related neurological disorders and potential therapeutic targets.