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- W2473839824 abstract "Preovulatory granulosa cells express the low-molecular-mass MAP2D variant of microtubule-associated protein 2 (MAP2). Activation of the luteinizing hormone choriogonadotropin receptor by human choriogonadotropin (hCG) promotes dephosphorylation of MAP2D on Thr256 and Thr259. We sought to evaluate the association of MAP2D with the cytoskeleton, and the effect of hCG on this association. MAP2D partially colocalized, as assessed by confocal immunofluorescence microscopy, with the vimentin intermediate filament and microtubule cytoskeletons in naive cells. In vitro binding studies showed that MAP2D bound directly to vimentin and β-tubulin. Phosphorylation of recombinant MAP2D on Thr256 and Thr259, which mimics the phosphorylation status of MAP2D in naive cells, reduces binding of MAP2D to vimentin and tubulin by two- and three-fold, respectively. PKA-dependent phosphorylation of vimentin (Ser32 and Ser38) promoted binding of vimentin to MAP2D and increased contraction of granulosa cells with reorganization of vimentin filaments and MAP2D from the periphery into a thickened layer surrounding the nucleus and into prominent cellular extensions. Chemical disruption of vimentin filament organization increased progesterone production. Taken together, these results suggest that hCG-stimulated dephosphorylation of MAP2D at Thr256 and Thr259, phosphorylation of vimentin at Ser38 and Ser72, and the resulting enhanced binding of MAP2D to vimentin might contribute to the progesterone synthetic response required for ovulation." @default.
- W2473839824 created "2016-07-22" @default.
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- W2473839824 date "2016-01-01" @default.
- W2473839824 modified "2023-10-16" @default.
- W2473839824 title "Dephosphorylation of MAP2D enhances its binding to vimentin in preovulatory ovarian granulosa cells" @default.
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- W2473839824 doi "https://doi.org/10.1242/jcs.190397" @default.
- W2473839824 hasPubMedCentralId "https://www.ncbi.nlm.nih.gov/pmc/articles/5004875" @default.
- W2473839824 hasPubMedId "https://pubmed.ncbi.nlm.nih.gov/27335427" @default.
- W2473839824 hasPublicationYear "2016" @default.
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