Abstract：
:SH-SY5Y cells differentiate into neuronal-like cells and express marker proteins like growth-associated protein (GAP-43) and neuropeptide tyrosine when treated with a low concentration (16 nM) of the phorbol ester 12-O-tetradecanoylphorbol-13-acetate (TPA) in the presence of growth factors or serum. Both control and differentiated cells expressed protein kinase C-alpha (PKC-alpha), PKC-epsilon, and PKC-zeta as revealed by Western blot analyses, but the subcellular distribution of the three isoforms was not uniform, indicating specific localized functions of the enzymes. In growth cones prepared from differentiating cells PKC-alpha and PKC-epsilon were enriched. In contrast, PKC-zeta was more evenly distributed within the differentiating cell. Cells treated with a high concentration of TPA (1.6 microM) differentiate poorly and continue to proliferate. In those cells, PKC-alpha and PKC-epsilon were found to be down-regulated while PKC-zeta remained present. Thus, down-regulation of PKC-alpha and PKC-epsilon appears to be incompatible with neuronal differentiation of SH-SY5Y cells. These cells also differentiate when treated with a combination of basic fibroblast growth factor and insulin-like growth factor I. Growth cones isolated from such cells are also enriched in PKC-alpha and PKC-epsilon, but not in PKC-zeta. Based on the subcellular distribution of PKC-alpha and epsilon, and that PKC substrates like GAP-43 and pp60c-src are enriched in SH-SY5Y growth cones, a role during neurite growth is suggested.
journal_name
J Neurosci Resjournal_title
Journal of neuroscience researchauthors
Parrow V,Fagerström S,Meyerson G,Nånberg E,Påhlman Sdoi
10.1002/jnr.490410609subject
Has Abstractpub_date
1995-08-15 00:00:00pages
782-91issue
6eissn
0360-4012issn
1097-4547journal_volume
41pub_type
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