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Research Article| Volume 264, ISSUE 10, P5746-5750, April 05, 1989

Protein Kinase C Inhibition of the Epidermal Growth Factor Receptor Tyrosine Protein Kinase Activity is Independent of the Oligomeric State of the Receptor

Open AccessPublished:April 05, 1989DOI:https://doi.org/10.1016/S0021-9258(18)83612-2
Protein Kinase C Inhibition of the Epidermal Growth Factor Receptor Tyrosine Protein Kinase Activity is Independent of the Oligomeric State of the Receptor
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      Treatment of A431 human epidermoid carcinoma cells with 4-phorbol 12-myristate 13-acetate (PMA) causes an inhibition of the high affinity binding of epidermal growth factor (EGF) to cell surface receptors and an inhibition of the EGF receptor tyrosine protein kinase activity. The hypothesis that PMA controls EGF receptor function by regulating the oligomeric state of the receptor was tested. Dimeric EGF receptors bound to 125I-EGF were identified by covalent cross-linking analysis using disuccinimidyl suberimidate. Treatment of cells with PMA in the presence of 20 nM 125I-EGF caused no significant change in the level of labeled cross-linked monomeric and dimeric receptor species. Investigation of the in vitro autophosphorylation of receptor monomers and dimers cross-linked with 1-ethyl-3-(3-dimethylaminopropyl)carbodiimide demonstrated that the treatment of cells with PMA caused an inhibition of the tyrosine phosphorylation of both monomeric and dimeric EGF receptors. We conclude that the inhibition of the EGF receptor tyrosine protein kinase activity caused by PMA is not associated with the regulation of the oligomeric state of the EGF receptor.

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      Article info

      Publication history

      Published online: April 05, 1989
      Received: August 29, 1988

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      DOI: https://doi.org/10.1016/S0021-9258(18)83612-2

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      © 1989 ASBMB. Currently published by Elsevier Inc; originally published by American Society for Biochemistry and Molecular Biology.

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