Linked Life Data

1468119

Source:http://linkedlifedata.com/resource/pubmed/id/1468119

Statements in which the resource exists as a subject.
PredicateObject
rdf:type
lifeskim:mentions
pubmed:issue
9
pubmed:dateCreated
1993-1-25
pubmed:abstractText
Ca2+ redistribution from an intracellular site(s) is a key biochemical event associated with relaxin (RLX) secretion by large luteal cells (LLCs) of porcine origin. However, the functional significance of internal stores of Ca2+ to basal rates of RLX secretion is not well understood. In addition, the identity of the intracellular storage site(s) for Ca2+ within LLCs is not known, nor is it clear if all RLX-releasing LLCs are equally dependent on this pool. In the present study, release of RLX from 24 h cultured luteal cells derived from early pregnant swine was monitored by a reverse hemolytic plaque assay (RHPA). Incubation of cultures in the presence of graded concentrations of thapsigargin (1 nM-1 microM), a plant sesquiterpene lactone that inhibits endoplasmic reticulum Ca(2+)-ATPase and thereby increases cytosolic Ca2+ concentrations, resulted in a dose-related increase in basal RLX secretion. The stimulatory effect of thapsigargin on RLX production was not abrogated by culture in Ca(2+)-free medium. Suppression of Ca2+ release from the endoplasmic reticulum of LLCs, achieved by incubating monolayers in medium containing dantrolene (1-100 microM), resulted in dose-related inhibition of basal RLX release. Taken together, these results suggest that the endoplasmic reticulum serves as a major storage site for Ca2+ redistribution within LLCs and, furthermore, that mobilization from this site is functionally coupled to basal secretion of RLX.
pubmed:grant
pubmed:language
eng
pubmed:journal
pubmed:citationSubset
IM
pubmed:chemical
pubmed:status
MEDLINE
pubmed:month
Oct
pubmed:issn
0143-4160
pubmed:author
pubmed:issnType
Print
pubmed:volume
13
pubmed:owner
NLM
pubmed:authorsComplete
Y
pubmed:pagination
571-80
pubmed:dateRevised
2007-11-14
pubmed:meshHeading
pubmed:year
1992
pubmed:articleTitle
Evidence that basal secretion of relaxin by individual cultured large luteal cells is influenced by mobilization of intracellular calcium: analysis by a reverse hemolytic plaque assay.
pubmed:affiliation
Department of Veterinary Physiology and Pharmacology, College of Veterinary Medicine, Iowa State University, Ames.
pubmed:publicationType
Journal Article, Research Support, U.S. Gov't, P.H.S.