Progesterone receptor membrane component 1 (PGRMC1) mediates the antiapoptotic action of progesterone (P4). PGRMC1 interacts with plasminogen activator inhibitor 1 RNA-binding protein (PAIRBP1), but the functional significance of this interaction is unknown. To examine the function of PGRMC1-PAIRBP1 interaction, PAIRBP1 was depleted from spontaneously immortalized granulosa cells (SIGCs) and the effects on the expression and localization of PGRMC1 as well as P4's ability to bind to SIGCs and prevent apoptosis was assessed. Depleting PAIRBP1 enhanced cellular 3H-P4 binding and did not alter the expression or cellular localization of PGRMC1 but attenuated P4's antiapoptotic action. Transfection of a PGRMC1-green fluorescent protein (GFP) peptide mimic, which binds PAIRBP1 as demonstrated by in situ proximity assay, doubled the rate at which SIGCs undergo apoptosis compared to cells transfected with either the empty GFP expression vector or Pairbp1 small interfering RNA. Moreover, P4 did not prevent these cells from undergoing apoptosis. Similar studies conducted with granulosa cells isolated from immature rats also showed that PGRMC1 interacts with PAIRBP1 and that transfection of PGRMC1-GFP peptide mimic accelerates the rate of granulosa cell apoptosis by 4-fold even in the presence of serum and P4. These studies support the concept that the interaction between PAIRBP1-PGRMC1 is an essential component of the mechanism through which P4 inhibits apoptosis. Surprisingly, PGRMC1- PAIRBP1 interaction is not required for P4 binding or the cellular localization of PGRMC1 but rather appears to couple PGRMC1 to downstream components of the P4-PGRMC1 signal transduction pathway. © 2013 by the Society for the Study of Reproduction, Inc.
Plasminogen activator inhibitor 1 rna-binding protein interacts with progesterone receptor membrane component 1 to regulate progesterone's ability to maintain the viability of spontaneously immortalized granulosa cells and rat granulosa cells / J.J. Peluso, A. Yuan, X. Liu, V. Lodde. - In: BIOLOGY OF REPRODUCTION. - ISSN 0006-3363. - 88:1(2013), pp. 20.1-20.10.
|Titolo:||Plasminogen activator inhibitor 1 rna-binding protein interacts with progesterone receptor membrane component 1 to regulate progesterone's ability to maintain the viability of spontaneously immortalized granulosa cells and rat granulosa cells|
LODDE, VALENTINA (Ultimo)
|Parole Chiave:||Apoptosis; Granulosa cells; Mechanisms of hormone action; Ovary; Progesterone/progesterone receptor; Animals; Cell Line; Cell Survival; Female; Gene Expression Regulation; Granulosa Cells; Membrane Proteins; Plasminogen Activator Inhibitor 1; Progesterone; RNA, Small Interfering; RNA-Binding Proteins; Rats; Receptors, Progesterone; Cell Biology|
|Settore Scientifico Disciplinare:||Settore VET/01 - Anatomia degli Animali Domestici|
|Data di pubblicazione:||2013|
|Digital Object Identifier (DOI):||http://dx.doi.org/10.1095/biolreprod.112.103036|
|Appare nelle tipologie:||01 - Articolo su periodico|