Linked Life Data

1331328

Source:http://linkedlifedata.com/resource/pubmed/id/1331328

Statements in which the resource exists as a subject.
PredicateObject
rdf:type
lifeskim:mentions
pubmed:issue
6
pubmed:dateCreated
1992-12-22
pubmed:abstractText
In rat pinealocytes, alpha 1-adrenergic activation, which leads to cytoplasmic alkalinization, also potentiates the beta-adrenergic stimulated cyclic AMP (cAMP) and cyclic GMP (cGMP) responses. Both elevation of intracellular calcium ([Ca2+]i) and activation of protein kinase C are involved in the potentiation mechanism. Recently, intracellular pH has also been found to modulate the adrenergic-stimulated cyclic nucleotide responses, suggesting intracellular pH may also affect the potentiation mechanism. This possibility was examined in the present study. Cytoplasmic alkalinization by ammonium chloride had an enhancing effect on the isoproterenol and ionomycin-stimulated cAMP and cGMP accumulation. In comparison, cytoplasmic acidification by sodium propionate reduced the isoproterenol and ionomycin-stimulated cAMP and cGMP responses. Direct measurement of [Ca2+]i indicated that neither ammonium chloride nor sodium propionate had an effect on the ionomycin-stimulated elevation of [Ca2+]i, suggesting their effects on cyclic nucleotide responses may be independent of [Ca2+]i. In cells stimulated by isoproterenol and an activator of protein kinase C, ammonium chloride had an enhancing effect on both cAMP and cGMP responses, whereas sodium propionate had no effect. Taken together, these results suggest that a site distal to elevation of [Ca2+]i and activation of protein kinase C, of importance to the potentiation mechanism, is modulated by intracellular pH.
pubmed:language
eng
pubmed:journal
pubmed:citationSubset
IM
pubmed:chemical
pubmed:status
MEDLINE
pubmed:month
Dec
pubmed:issn
0022-3042
pubmed:author
pubmed:issnType
Print
pubmed:volume
59
pubmed:owner
NLM
pubmed:authorsComplete
Y
pubmed:pagination
2304-10
pubmed:dateRevised
2007-11-15
pubmed:meshHeading
pubmed:year
1992
pubmed:articleTitle
Intracellular pH on protein kinase C and ionomycin potentiation of isoproterenol-stimulated cyclic AMP and cyclic GMP production in rat pinealocytes.
pubmed:affiliation
Department of Physiology, Faculty of Medicine, University of Alberta, Edmonton, Canada.
pubmed:publicationType
Journal Article, Research Support, Non-U.S. Gov't