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Actions of Steroids: New Neurotransmitters
Lauren M Rudolph1, Charlotte A Cornil2, Melinda A Mittelman-Smith3
1Department of Neurobiology and Laboratory of Neuroendocrinology, David Geffen School of Medicine at the University of California Los Angeles, Los Angeles, California 90095, lrudolph@mednet.ucla.edu.
Summary
Steroids rapidly regulate brain functions, acting like neurotransmitters through membrane receptors. This research clarifies how these rapid, non-classical steroid actions influence behavior and physiology.
Area of Science:
- Neuroendocrinology
- Neurobiology
- Molecular Endocrinology
Background:
- Classical steroid action involves genomic mechanisms.
- Emerging evidence highlights rapid, non-genomic steroid actions.
- Steroids exhibit neurotransmitter-like functions in the central nervous system (CNS).
Purpose of the Study:
- To elucidate the mechanisms of rapid, membrane-initiated steroid signaling.
- To explore the role of membrane steroid receptors in CNS functions.
- To understand how steroids modulate behavior and physiology via non-classical pathways.
Main Methods:
- Investigated rapid estradiol effects in avian systems, focusing on aromatase activity.
- Examined membrane progesterone receptor and classical progesterone receptor roles in rodent reproductive physiology.
- Studied membrane glucocorticoid receptor presence and function in various cell types and species.
Main Results:
- Rapid estrogen signaling in birds affects sensorimotor function and sexual motivation.
- Membrane receptors mediate reproductive physiology via second messenger systems in rodents.
- Membrane glucocorticoid receptors influence nuclear translocation and transcriptional activity.
Conclusions:
- Steroids function akin to neurotransmitters, rapidly regulating CNS functions.
- Membrane-initiated steroid signaling impacts morphology and behavior.
- Further research is needed to fully characterize steroid receptor-specific brain functions.