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J. Biol. Chem., Vol. 266, Issue 16, 10131-10135, Jun, 1991
NG Anderson, E Kilgour and TW Sturgill
Treatment of BC3H1 myocytes or 3T3-L1 fibroblasts with fluoroaluminate
(AlF4-), a direct activator of G proteins, increased the tyrosine
phosphorylation of a 42-kDa cytosolic protein. AlF4- induced a parallel
increase in protein kinase activity toward myelin basic protein (MBP) in
partially purified cell extracts. To test whether AlF4- was activating the
42-kDa MAP (mitogen-activated protein) kinase, extracts from AlF4--treated
cells were taken through the chromatographic steps routinely used to purify
MAP kinase from growth factor-stimulated cells. Following phenyl-Superose
chromatography, a peak of MBP kinase activity eluted at a position
characteristic of MAP kinase. Immunoblotting of the active fractions with
anti-phosphotyrosine antibodies revealed a single reactive protein band of
Mr 42,000. Stimulation of MAP kinase by AlF4- was rapid, peaking within 15
min and persisting for at least 1 h. In contrast, the activation of MAP
kinase by insulin was transient, characteristic of its activation by growth
factors in other cell types. Although concentrations of sodium fluoride
greater than 1 mM also activated MAP kinase, this effect was shown to be
dependent upon the simultaneous presence of aluminum ions in the medium.
Activation of MAP kinase by AlF4- was not affected by either cellular
depletion of protein kinase C or pretreatment of cells with pertussis
toxin. Potential sites of action of AlF4- are discussed. These findings
suggest that activation of a G protein(s) in intact cells can initiate
events that result in tyrosine phosphorylation and activation of MAP
kinase.
Activation of mitogen-activated protein kinase in BC3H1 myocytes by fluoroaluminate
Department of Internal Medicine, University of Virginia, Charlottesville 22908.
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