These tools will no longer be maintained as of December 31, 2024. Archived website can be found here. PubMed4Hh GitHub repository can be found here. Contact NLM Customer Service if you have questions.


Pubmed for Handhelds

PUBMED FOR HANDHELDS

Search MEDLINE/PubMed

  • Title: PDGF-induced receptor phosphorylation and phosphoinositide hydrolysis are unaffected by protein kinase C activation in mouse Swiss 3T3 and human skin fibroblasts.
    Author: Sturani E, Vicentini LM, Zippel R, Toschi L, Pandiella-Alonso A, Comoglio PM, Meldolesi J.
    Journal: Biochem Biophys Res Commun; 1986 May 29; 137(1):343-50. PubMed ID: 2424446.
    Abstract:
    Short (1-10 min) pretreatment of intact cells with activators of protein kinase C (e.g. phorbol-12 myristate, 13-acetate, PMA) affects the activity of a variety of surface receptors (for growth factors, hormones and neurotransmitters), with inhibition of transmembrane signal generation. In two types of fibroblasts we demonstrate that the PDGF receptor is unaffected by PMA. Exposure to PMA at concentrations up to 100 nM for 10 min failed to inhibit either one of the agonist-induced, receptor-coupled responses of PDGF: the autophosphorylation of receptor molecules at tyrosine residues, and the hydrolysis of membrane polyphosphoinositides. In contrast, the EGF receptor autophosphorylation (in A 431 cells) and the bombesin-induced phosphoinositide hydrolysis were readily inhibited by PMA. Feed-back inhibition of surface receptors by protein kinase C-mediated phosphorylation is therefore not general, and cannot be the only process responsible for the attenuation of receptor-mediated responses in eukaryotic cells.
    [Abstract] [Full Text] [Related] [New Search]