Progestin receptor subtypes in the brain: the known and the unknown
- PMID: 18308838
- PMCID: PMC2408817
- DOI: 10.1210/en.2008-0097
Progestin receptor subtypes in the brain: the known and the unknown
Abstract
Progesterone (P), the most biologically active progestin of ovarian origin, modulates numerous cellular functions in the central nervous system to coordinate physiology and reproduction. The neurobiological activity of P is mediated not by a single form of the progestin receptor (PR), but by two neural isoforms of PRs, PR-A and PR-B. Classical model of P action assumes that these neural effects are primarily mediated via their intracellular PRs, acting as transcriptional regulators, in steroid-sensitive neurons, modulating genes and genomic networks. Evidence has emerged, however, that activation of neural PRs is much more diverse; four distinct classes of molecules, neurotransmitters, peptide growth factors, cyclic nucleotides, and neurosteroids have been shown to activate the PRs via cross-talk and pathway convergence. In addition, rapid signaling events associated with membrane receptors and/or subpopulations of cytoplasmic PRs, via activation of protein kinase cascades, regulate PR gene expression in the cytoplasm independent of PR nuclear action. The increasing in vitro and in vivo evidence of differential transcriptional activities and coregulator interactions between PR-A and PR-B predict that these isoforms could have distinct roles in mediating additional and/or alternate signaling pathways within steroid-sensitive neurons. In this minireview, we evaluate the available data and discuss the possible roles of the isoforms in the regulation of neurobiological processes.
Figures
![Figure 1](https://cdn.statically.io/img/www.ncbi.nlm.nih.gov/pmc/articles/instance/2408817/bin/zee0060840640001.gif)
![Figure 2](https://cdn.statically.io/img/www.ncbi.nlm.nih.gov/pmc/articles/instance/2408817/bin/zee0060840640002.gif)
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