PKC and PTPα participate in Src activation by 1α,25(OH)2 vitamin D3 in C2C12 skeletal muscle cells
| Autor: | Marcelo Daniel Costabel, Ricardo Boland, Claudia Buitrago |
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| Rok vydání: | 2011 |
| Předmět: |
Models
Molecular MAPK/ERK pathway Indoles MAP Kinase Signaling System Muscle Fibers Skeletal Phosphatase Biology Biochemistry Mice Enzyme activator Endocrinology Calcitriol Cell Line Tumor medicine Animals Myocyte Computer Simulation Phosphorylation Molecular Biology Protein Kinase C Protein kinase C Receptor-Like Protein Tyrosine Phosphatases Class 4 Skeletal muscle Cell biology Enzyme Activation Protein Transport src-Family Kinases medicine.anatomical_structure Tetradecanoylphorbol Acetate Thermodynamics Protein Binding Proto-oncogene tyrosine-protein kinase Src |
| Zdroj: | Molecular and Cellular Endocrinology. 339:81-89 |
| ISSN: | 0303-7207 |
| DOI: | 10.1016/j.mce.2011.03.022 |
| Popis: | We previously demonstrated that 1α,25(OH)(2)-vitamin D(3) [1α,25(OH)(2)D(3)] induces Src activation, which mediates the hormone-dependent ERK1/2 and p38 MAPK phosphorylation in skeletal muscle cells. In the present study, we have investigated upstream steps whereby 1α,25(OH)(2)D(3) may act to transmit its signal to Src. Preincubation with the PKC inhibitor Ro318220 demonstrated the participation of PKC in 1α,25(OH)(2)D(3)-dependent Src activation. Of interest, the hormone promoted the activation of δ the isoform of PKC. We also explored the role of PTPα in PKC-mediated Src stimulation. Silencing of PTPα with a specific siRNA suppressed Src activation induced by 1α,25(OH)(2)D(3). Hormone treatment increased PTPα (Tyr789) phosphorylation and PKC-dependent phosphatase activity. Accordingly, 1α,25(OH)(2)D(3) promoted serine phosphorylation of PTPα in a PKC-dependent manner. Confocal immunocytochemistry and co-immunoprecipitation assays revealed that the hormone induces the co-localization of Src and PTPα with PKC participation. Computational analysis revealed that the electrostatic interaction between Src and PTPα is favored when PTPα is phosphorylated in Tyr789. These data suggest that 1α,25(OH)(2)D(3) acts in skeletal muscle upstream on MAPK cascades sequentially activating PKC, PTPα and Src. |
| Databáze: | OpenAIRE |
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