Tyrosine-specific MAPK phosphatases and the control of ERK signaling in PC12 cells.
ABSTRACT: BACKGROUND: Spatio-temporal control of extracellular signal-regulated kinase ( ERK) activity, a critical determinant of the cell's response to growth factors, requires timely dephosphorylation of its regulatory tyrosine and/or threonine residue by MAPK phosphatases. We studied the physiological role of kinase interaction motif (KIM)-containing protein tyrosine phosphatases (PTPs) in the control of EGF- and NGF-induced ERK activity in neuroendocrine PC12 cells. RESULTS: We found a single KIM-containing PTP to be endogenously expressed in rat PC12 cells: the transmembrane PTPRR isoform termed PCPTP1. Protein knock-down of PCPTP1, or fourfold overexpression of its mouse orthologue, PTPBR7, left EGF- and NGF-induced ERK1/2 activity in PC12 cells unaltered. Ectopic expression of cytosolic PTPRR isoforms, however, resulted in reduced EGF-induced ERK1/2 activity, an effect that was dependent on the phosphatase activity and the KIM-domain of these PTPs. CONCLUSION: The finding that robust changes in tyrosine-specific MAPK phosphatase expression levels have minor effects on temporal ERK1/2 activity control in PC12 cells suggests that dual-specificity MAPK phosphatases may act as major regulators of growth factor- induced ERK1/2 signaling in these cells.[1]References
- Tyrosine-specific MAPK phosphatases and the control of ERK signaling in PC12 cells. Noordman, Y.E., Jansen, P.A., Hendriks, W.J. Journal of molecular signaling (2006) [Pubmed]
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