Linked Life Data

6100474

Source:http://linkedlifedata.com/resource/pubmed/id/6100474

Statements in which the resource exists as a subject.
PredicateObject
rdf:type
lifeskim:mentions
pubmed:dateCreated
1985-12-10
pubmed:abstractText
Chemoattractant receptors on leukocytes can trigger a number of cellular responses, including the cytoskeletal reorganization, changes in cell shape, directed motility, lysosomal enzyme secretion, and activation of the respiratory burst. The dose of chemoattractants required to induce motility-related functions is generally at least ten-fold smaller than the dose required to initiate secretory and respiratory burst activities. This finding and other pharmacological evidence clearly indicate that the two types of functions (i.e. motility and secretion) are regulated differently and can be divergently modified by drugs. The affinity of the oligopeptide chemoattractant receptor on polymorphonuclear leukocytes and macrophages is heterogeneous and dynamically regulated by guanine nucleotides and prior agonist exposure. High- and low-affinity forms of the oligopeptide receptor have been identified by direct binding studies. Our data suggest that low doses of agonists can initiate interconversion of low- and high-affinity states of that portion of chemoattractant receptors regulated by guanine nucleotides. On the other hand, high doses of agonists sufficient to induce chemotactic desensitization, lysosomal enzyme secretion, and the respiratory burst lead to the formation of a new population of high-affinity receptors. These binding sites are insensitive to the effects of guanine nucleotides and appear to be rapidly internalized. Transmethylation reactions mediated by S-adenosyl methionine are required for the activation of a phospholipase and release of arachidonate from leukocytes by chemotactic factors. We suggest that release of arachidonate from membrane phospholipid activates and translocates a cytosolic but loosely membrane-associated protein kinase C into the membrane and that this kinase participates in stimulus-response coupling of chemoattractant receptors.
pubmed:grant
pubmed:language
eng
pubmed:journal
pubmed:citationSubset
IM
pubmed:chemical
pubmed:status
MEDLINE
pubmed:issn
0732-0582
pubmed:author
pubmed:issnType
Print
pubmed:volume
2
pubmed:owner
NLM
pubmed:authorsComplete
Y
pubmed:pagination
257-81
pubmed:dateRevised
2007-11-15
pubmed:meshHeading
pubmed:year
1984
pubmed:articleTitle
Chemoattractant receptors on phagocytic cells.
pubmed:publicationType
Journal Article, Research Support, U.S. Gov't, P.H.S., Review