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: Neuropeptide Y enhances ATP-induced formation of inositol phosphates in chromaffin cells.
    Author: Zheng J, Zhang P, Toews M, Hexum TD.
    Journal: Biochem Biophys Res Commun; 1997 Oct 09; 239(1):287-90. PubMed ID: 9345312.
    Abstract:
    Bovine chromaffin cells contain high affinity NPY binding sites coupled through a pertussis toxin-sensitive G protein to inhibition of cAMP accumulation. NPY alone does not alter [3H]inositol phosphate formation from [3H]phosphoinositides in these cells. Increasing NPY concentrations, in the presence of ATP (300 microM), produced a dose-dependent enhancement in [3H]-inositol phosphate formation, EC50 = 3.2 nM. Inclusion of the selective NPY-Y1 receptor antagonist BW1229 (1 microM) produced a marked decrease in NPY potency (EC50 = 3.3 microM). The Y1 receptor agonist, [Leu31, Pro34]-NPY, was equally effective with NPY, whereas NPY18-36, a Y2 receptor agonist, was much less effective. Inclusion of NPY with ATP also produced an enhancement in the release of intracellular Ca2+. The ability of NPY to enhance both [3H]inositol phosphate formation and the release of intracellular Ca2+ was pertussis toxin-insensitive. NPY action on bovine chromaffin cell receptor(s) appears to facilitated by different G proteins: one which can inhibit cAMP accumulation via a pertussis toxin-sensitive process and another which can enhance ATP activation of the inositol phosphate signaling pathway by a pertussis toxin-insensitive process.
    [Abstract] [Full Text] [Related] [New Search]