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Muscarinic Agonists and Phorbol Esters Increase Tyrosine Phosphorylation of a 40-Kilodalton Protein in Hippocampal Slices
Kathleen R. Stratton, Paul F. Worley, Richard L. Huganir and Jay M. Baraban
Proceedings of the National Academy of Sciences of the United States of America
Vol. 86, No. 7 (Apr. 1, 1989), pp. 2498-2501
Published by: National Academy of Sciences
Stable URL: http://www.jstor.org/stable/33506
Page Count: 4
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We have used the hippocampal slice preparation to investigate the regulation of protein tyrosine phosphorylation in brain. After pharmacological treatment of intact slices, proteins were separated by electrophoresis, and levels of protein tyrosine phosphorylation were assessed by immunoblotting with specific anti-phosphotyrosine antibodies. Phorbol esters, activators of the serine- and threonine-phosphorylating enzyme protein kinase C, selectively increase tyrosine phosphorylation of a soluble protein with an apparent molecular mass of approximately 40 kilodaltons. Muscarinic agonists such as carbachol and oxotremorine M that strongly activate the inositol phospholipid system also increase tyrosine phosphorylation of this protein. Neurotransmitter activation of the inositol phospholipid system and protein kinase C appears to trigger a cascade leading to increased tyrosine phosphorylation.
Proceedings of the National Academy of Sciences of the United States of America © 1989 National Academy of Sciences