Regulatory function of the P295-T311 motif of the estrogen receptor alpha - does proteasomal degradation of the receptor induce emergence of peptides implicated in estrogenic responses?

Nuclear Receptor Signaling
Dominique GalloGuy Leclercq

Abstract

The way in which estrogen receptor alpha (ERalpha) mediates gene transcription and hormone-dependent cancer cell proliferation is now being largely reconsidered in view of several recent discoveries. ERalpha-mediated transcription appears to be a cyclic and transient process where the proteasome - and thus receptor degradation - plays a pivotal role. In view of our recent investigations, which demonstrate the estrogenic activity of a synthetic peptide corresponding to a regulatory motif of the receptor (ERalpha17p), we propose that ERalpha proteasomal degradation could induce the emergence of regulatory peptide(s). The latter would function as a signal and contribute to the ERalpha activation process, amplifying the initial hormonal stimulation and giving rise to sustained estrogenic response.

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