Linked Life Data

8482723

Source:http://linkedlifedata.com/resource/pubmed/id/8482723

Statements in which the resource exists as a subject.
PredicateObject
rdf:type
lifeskim:mentions
pubmed:issue
2
pubmed:dateCreated
1993-5-28
pubmed:abstractText
Previous studies have shown that the tumour-promoting phorbol ester 12-O-tetradecanoyl phorbol-13 acetate (TPA) induces both morphological and functional differentiation in SH-SY5Y human neuroblastoma cells (Påhlman et al., 1981). In order to investigate the role of protein kinase C (PKC) in TPA-induced maturation of SH-SY5Y cells, we have used staurosporine, which is a potent inhibitor of protein kinases including PKC. Treatment of SH-SY5Y cells with 25 nM staurosporine for 72 hours caused an appearance of long, neuritelike processes with varicosities, terminated by growth cones. The morphological differentiation was accompanied by a cessation of DNA synthesis, induction of growth associated protein 43 (GAP-43), and neuropeptide Y (NPY) mRNA. These effects of staurosporine were comparable to those elicited by TPA. Staurosporine further induced a time-dependent increase in the expression of tyrosine hydroxylase protein and a 30-fold increase in the concentration of noradrenaline. TPA only induced a marginal increase in tyrosine hydroxylase expression. Both TPA and staurosporine induced an appearance of voltage-gated Ca2+ channels in SH-SY5Y cells detected with single-cell fluorescent measurements using fura-2. The Ca2+ channels were found almost exclusively in growth cones and varicosities. Staurosporine inhibited both basal and a TPA-induced phosphorylation of an endogenous 80kDa PKC substrate (p80), and also blocked c-fos proto-oncogene mRNA expression induced by the phorbol ester. Bryostatin 1, a potent activator of PKC, has failed to induce morphological or functional differentiation in SH-SY5Y cells (Jalava et al., 1990). Incubation of SH-SY5Y cells in the presence of 100 nM bryostatin 1 for 24 hours caused a complete disappearance of all immunoreactive alpha-, beta-, and zeta-PKC. The level of epsilon-PKC decreased by 70%. Staurosporine induced a partial translocation of the epsilon-isoenzyme but it failed to cause down-regulation of epsilon-PKC. Bryostatin 1-treatment did not interfere in the ability of staurosporine to induce morphological differentiation, cessation of DNA synthesis, and GAP-43 and NPY mRNA expression. The ability of staurosporine to stimulate tyrosine hydroxylase expression and to increase cellular content of noradrenaline was also unaffected. Taken together the results of this study show that staurosporine induces a mature neuronal noradrenergic phenotype in SH-SY5Y cells through an alpha-, beta-, and zeta-PKC-independent pathway.
pubmed:language
eng
pubmed:journal
pubmed:citationSubset
IM
pubmed:chemical
pubmed:status
MEDLINE
pubmed:month
May
pubmed:issn
0021-9541
pubmed:author
pubmed:issnType
Print
pubmed:volume
155
pubmed:owner
NLM
pubmed:authorsComplete
Y
pubmed:pagination
301-12
pubmed:dateRevised
2007-11-15
pubmed:meshHeading
pubmed-meshheading:8482723-Alkaloids, pubmed-meshheading:8482723-Bryostatins, pubmed-meshheading:8482723-Cell Aging, pubmed-meshheading:8482723-Cell Differentiation, pubmed-meshheading:8482723-Gene Expression, pubmed-meshheading:8482723-Genes, fos, pubmed-meshheading:8482723-Humans, pubmed-meshheading:8482723-Lactones, pubmed-meshheading:8482723-Macrolides, pubmed-meshheading:8482723-Neuroblastoma, pubmed-meshheading:8482723-Neurons, pubmed-meshheading:8482723-Phenotype, pubmed-meshheading:8482723-Phosphorylation, pubmed-meshheading:8482723-Protein Kinase C, pubmed-meshheading:8482723-Protein Kinase Inhibitors, pubmed-meshheading:8482723-Staurosporine, pubmed-meshheading:8482723-Subcellular Fractions, pubmed-meshheading:8482723-Substrate Specificity, pubmed-meshheading:8482723-Tetradecanoylphorbol Acetate, pubmed-meshheading:8482723-Tumor Cells, Cultured
pubmed:year
1993
pubmed:articleTitle
Protein kinase inhibitor, staurosporine, induces a mature neuronal phenotype in SH-SY5Y human neuroblastoma cells through an alpha-, beta-, and zeta-protein kinase C-independent pathway.
pubmed:affiliation
Department of Biochemistry and Pharmacy, Abo Akademi University, Turku, Finland.
pubmed:publicationType
Journal Article, Research Support, Non-U.S. Gov't