Hemin-induced cap formation in lymphocytes: inhibition by protein tyrosine kinase inhibitors.
Exp Cell Res
; 205(1): 159-64, 1993 Mar.
Article
em En
| MEDLINE
| ID: mdl-8095903
ABSTRACT
Hemin, an oxidant which is mitogenic for lymphocytes, was found to induce cap formation for Con A sites in murine and human lymphocytes and for IgG and Thy 1.2 sites in murine lymphocytes. Doses of hemin which induced capping also induced a redistribution of actin to a detergent-insoluble form. Similar to hemin, we found that heat shock also induced capping of Con A and IgG sites in murine splenocytes, as well as actin redistribution in human peripheral blood mononuclear cells. Specific inhibitors of protein tyrosine kinases, termed tyrphostins, were found to inhibit hemin-induced cap formation. In addition, ligand-dependent cap formation was also inhibited by tyrphostins. Hemin-induced cap formation may result from alteration in cytoskeletal structure and distribution. In addition, changes in membrane lipid composition induced by phospholipase C-gamma 1, known to be activated by protein tyrosine phosphorylation, may initiate actin polymerization and membrane-site redistribution.
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Coleções:
01-internacional
Base de dados:
MEDLINE
Assunto principal:
Linfócitos
/
Tirfostinas
/
Hemina
/
Capeamento Imunológico
Limite:
Animals
/
Humans
Idioma:
En
Ano de publicação:
1993
Tipo de documento:
Article