Erythropoietin Inhibits Calcium-Induced Neurotransmitter Release from Clonal Neuronal Cells

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...

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Bibliographic Details
Published in:Biochemical and biophysical research communications 2000-12, Vol.279 (1), p.293-297
Main Authors: Kawakami, Masakatsu, Iwasaki, Satoshi, Sato, Kazuki, Takahashi, Masami
Format: Article
Language:English
Subjects:
Animals
Calcium - metabolism
Dopamine - metabolism
Enzyme Activation
erythropoietin
Erythropoietin - pharmacology
GAP-43
JAK2
Janus Kinase 2
Neurons - metabolism
neurotransmitter release
PC12 Cells
Protein-Tyrosine Kinases - metabolism
Proto-Oncogene Proteins
Rats
Receptors, Erythropoietin - metabolism
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Summary: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.
ISSN:0006-291X
1090-2104
DOI:10.1006/bbrc.2000.3926