Journal
BIOCHEMICAL AND BIOPHYSICAL RESEARCH COMMUNICATIONS
Volume 279, Issue 1, Pages 293-297Publisher
ACADEMIC PRESS INC ELSEVIER SCIENCE
DOI: 10.1006/bbrc.2000.3926
Keywords
erythropoietin; neurotransmitter release; JAK2; GAP-43; PC12 cells
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Erythropoietin (EPO) and EPO receptor (EPO-R) are expressed in the brain but their neuronal functions are not yet clarified. The effects of EPO on neurosecretion were studied using clonal rat pheochromocytoma PC12 cells. EPO suppressed Ca2+-induced dopamine release from PC12 cells in a concentration-and time-dependent manner. Inhibition was also produced by an EPO mimetic peptide 1 (EMP1), a small synthetic peptide agonist of EPO-R, but not by its inactive analogue in which Cys residues were substituted with Ser. Inhibition was abolished by genistein but not by genistin. EPO and EMP1 induced autophosphorylation of Janus kinase 2 (JAK 2), a tyrosine kinase that associates with EPO-R, and dephosphorylation of GAP-43 in a tyrosine kinase-dependent fashion. These results suggest that EPO suppresses neurotransmitter release through activation of EPO-R linked to JAK2. (C) 2000 Academic Press.
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