Linked Life Data

3131167

Source:http://linkedlifedata.com/resource/pubmed/id/3131167

Statements in which the resource exists as a subject.
PredicateObject
rdf:type
lifeskim:mentions
pubmed:issue
1-2
pubmed:dateCreated
1988-6-24
pubmed:abstractText
In cultured rat pituitary cells (GH4C1 cells) the ability of thyrotropin-releasing hormone (TRH) to stimulate phosphodiesteratic cleavage of phosphatidylinositol 4,5-bisphosphate (PIP2) by a phospholipase C-type reaction was confirmed. The dose-response relationship for the TRH-stimulated phospholipase C was elucidated as was the relationship between the various inositol phosphates formed during the first few seconds after stimulation. The TRH-stimulated phospholipase C was subject to desensitization by repeated TRH treatment of cell cultures. This desensitization was dependent on the dose of TRH during preincubation. Following desensitization no decline in the levels of PIP2 was detected, even in the presence of decreased levels of PIP2 precursors. The TRH-stimulated phospholipase C activity was not attenuated following pretreatment with 12-O-tetradecanoylphorbol 3-acetate (TPA) to stimulate protein kinase C activity, and TRH also induced desensitization in the presence of the protein kinase C inhibitor polymyxin B. Thus, regulation of protein kinase C activity seemed not to be involved in the desensitization process. It is suggested that the ability of TRH to desensitize its own receptors and their link to phospholipase C, is mediated by the rise in intracellular calcium that is initiated by the TRH-receptor interaction.
pubmed:language
eng
pubmed:journal
pubmed:citationSubset
IM
pubmed:chemical
pubmed:status
MEDLINE
pubmed:month
Mar
pubmed:issn
0303-7207
pubmed:author
pubmed:issnType
Print
pubmed:volume
56
pubmed:owner
NLM
pubmed:authorsComplete
Y
pubmed:pagination
107-14
pubmed:dateRevised
2007-11-15
pubmed:meshHeading
pubmed:year
1988
pubmed:articleTitle
Thyrotropin-releasing hormone-stimulated inositol trisphosphate formation is liable to thyrotropin-releasing hormone-induced desensitization by a calcium-dependent mechanism.
pubmed:affiliation
Hormone Laboratory, Aker Hospital, Oslo, Norway.
pubmed:publicationType
Journal Article