Protein kinase C delta (PKCdelta) is required for protein tyrosine phosphatase mu (PTPmu)-dependent neurite outgrowth.
Protein tyrosine phosphatase mu (PTPmu) is an adhesion molecule in the immunoglobulin superfamily and is expressed in the developing nervous system. We have shown that PTPmu can promote neurite outgrowth of retinal ganglion cells and it regulates neurite outgrowth mediated by N-cadherin (S. M. Burden-Gulley and S. M. Brady-Kalnay, 1999, J. Cell Biol. 144, 1323-1336). We previously demonstrated that PTPmu binds to the scaffolding protein RACK1 in yeast and mammalian cells (T. Mourton et al., 2001, J. Biol. Chem. 276, 14896-14901). RACK1 is a receptor for activated protein kinase C (PKC). In this article, we demonstrate that PKC is involved in PTPmu-dependent signaling. PTPmu, RACK1, and PKCdelta exist in a complex in cultured retinal cells and retinal tissue. Using pharmacologic inhibition of PKC, we demonstrate that PKCdelta is required for neurite outgrowth of retinal ganglion cells on a PTPmu substrate. These results suggest that PTPmu signaling via RACK1 requires PKCdelta activity to promote neurite outgrowth.
Rosdahl
Jullia A
JA
Department of Molecular Biology and Microbiology, Case Western Reserve University, School of Medicine, Cleveland, Ohio 44106-4960, USA.
Mourton
Tracy L
TL
Brady-Kalnay
Susann M
SM
D000818:Animals; D002454:Cell Differentiation / Q000187:drug effects / Q000502:physiology*; D048429:Cell Size / Q000187:drug effects / Q000502:physiology; D002642:Chick Embryo; D020439:Growth Cones / Q000201:enzymology / Q000648:ultrastructure; D007527:Isoenzymes / Q000037:antagonists & inhibitors / Q000378:metabolism*; D046911:Macromolecular Substances; D016501:Neurites / Q000187:drug effects / Q000201:enzymology* / Q000648:ultrastructure; D020033:Protein Isoforms / Q000378:metabolism; D011493:Protein Kinase C / Q000037:antagonists & inhibitors / Q000378:metabolism*; D051745:Protein Kinase C-delta; D017027:Protein Tyrosine Phosphatases / Q000378:metabolism*; D054623:Receptor-Like Protein Tyrosine Phosphatases, Class 2; D054635:Receptor-Like Protein Tyrosine Phosphatases, Class 8; D000075370:Receptors for Activated C Kinase; D011956:Receptors, Cell Surface / Q000378:metabolism*; D012160:Retina / Q000166:cytology / Q000196:embryology* / Q000201:enzymology; D012165:Retinal Ganglion Cells / Q000166:cytology / Q000187:drug effects / Q000201:enzymology*; D015398:Signal Transduction / Q000187:drug effects / Q000502:physiology; D013234:Stem Cells / Q000166:cytology / Q000378:metabolism
D007527:Isoenzymes; D046911:Macromolecular Substances; D020033:Protein Isoforms; D000075370:Receptors for Activated C Kinase; D011956:Receptors, Cell Surface; D011493:Protein Kinase C; D051745:Protein Kinase C-delta; D017027:Protein Tyrosine Phosphatases; D054623:Receptor-Like Protein Tyrosine Phosphatases, Class 2; D054635:Receptor-Like Protein Tyrosine Phosphatases, Class 8