Abstract:
:Polyphosphoinositide hydrolysis was examined in membranes from thyrotropin-releasing hormone (TRH)-responsive GH3 pituitary cells. [3H]Inositol phosphates (IP2 and IP3) were generated upon incubation of membranes from [3H]inositol-labeled cells indicating the presence of a membrane-associated polyphosphoinositide phosphodiesterase (PPI PDE). Membrane PPI PDE activity was found to be stimulated by TRH and by GTP-gamma-S in Ca2+-modulated manner. In addition, TRH-stimulated PPI hydrolysis was potentiated by GTP. These results demonstrate direct in vitro effects of a hormone on PPI turnover and suggest the involvement of a GTP-binding component in transmembrane signalling by TRH.
journal_name
Biochem Biophys Res Communjournal_title
Biochemical and biophysical research communicationsauthors
Lucas DO,Bajjalieh SM,Kowalchyk JA,Martin TFdoi
10.1016/0006-291x(85)91192-1subject
Has Abstractpub_date
1985-10-30 00:00:00pages
721-8issue
2eissn
0006-291Xissn
1090-2104pii
0006-291X(85)91192-1journal_volume
132pub_type
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