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. 1993 Dec 2;123(6):1597–1605. doi: 10.1083/jcb.123.6.1597

Beta 2 integrin engagement triggers actin polymerization and phosphatidylinositol trisphosphate formation in non-adherent human neutrophils

PMCID: PMC2290867  PMID: 7504676

Abstract

Beta 2 integrins are involved in the adhesion of leukocytes to other cells and surfaces. Although adhesion is required for cell locomotion, little is known regarding the way beta 2 integrin-receptors affect the actin network in leukocytes. In the present study filamentous actin (F- actin) levels in non-adherent human neutrophils have been measured by phalloidin staining after antibody cross-linking of beta 2 integrins. Antibody engagement of beta 2 integrins resulted in a rapid and sustained (146 and 131% after 30 and 300 s, respectively) increase in the neutrophil F-actin content. This is in contrast to stimulation with N-formyl-l-methionyl-l-leucyl-l-phenylalanine (fMLP), which causes a prompt and pronounced but rapidly declining rise in F-actin (214 and 127% after 15 and 300 s, respectively). Priming neutrophils with 1 nM PMA, a low concentration that did not influence the F-actin content per se, increased the magnitude of the beta 2 integrin-induced response but had no effect on the kinetics (199% after 30 s and 169% after 300 s). Removal of extracellular Ca2+ only marginally affected the beta 2 integrin-induced F-actin response for cells that were pretreated with PMA whereas the response for nonprimed cells was reduced by half. This suggests that even though extracellular Ca2+ has a modulatory effect it is not an absolute requirement for beta 2 integrin-induced actin polymerization. beta 2 integrin engagement did not affect the resting cellular level of cAMP arguing against a role of cAMP in beta 2 integrin-induced actin assembly.(ABSTRACT TRUNCATED AT 250 WORDS)

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Selected References

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