Transmethylation reactions regulate affinity and functional activity of chemotactic factor receptors on macrophages.
Journal Article (Journal Article)
Methylation mediated by S-adenosyl-L-methionine is required for the chemotaxis of mononuclear leukocytes. We investigated whether transmethylation reactions are required for normal functioning of chemotactic factor receptors. Three chemoatractant-mediated functions in macrophages, chemotaxis, the stimulated release of arachidonic acid from membrane phospholipids and superoxide production, are markedly depressed by agents that inhibit cellular methylation reactions. Treatment of macrophages with methylation inhibitors decreased the affinity of the N-formylated chemoattractant receptor present on these cells by a factor of 4.5, but did not significantly alter the total receptor on macrophages can exist in more than one affinity state and that an ongoing methylation reaction is required for the maintenance of the receptor in its higher affinity form. Inhibition of methylation lowers the affinity of the receptor and renders it nonfunctional or "uncoupled" in its ability to produce chemotaxis, superoxide and the release of a arachidonic acid from leukocyte membranes.
Full Text
Duke Authors
Cited Authors
- Pike, MC; Snyderman, R
Published Date
- January 1, 1982
Published In
Volume / Issue
- 28 / 1
Start / End Page
- 107 - 114
PubMed ID
- 6279308
International Standard Serial Number (ISSN)
- 0092-8674
Digital Object Identifier (DOI)
- 10.1016/0092-8674(82)90380-4
Language
- eng
Conference Location
- United States