Beta2 integrins target Rap GTPases to the plasma membrane by means of degranulation.

Karim Dib, Lena Axelsson, Tommy Andersson

Research output: Contribution to journalArticlepeer-review

2 Citations (Scopus)


We report the novel observation that engagement of ß2 integrins on human neutrophils is accompanied by increased levels of the small GTPases Rap1 and Rap2 in a membrane-enriched fraction and a concomitant decrease of these proteins in a granule-enriched fraction. In parallel, we observed a similar time-dependent decrease of gelatinase B (a marker of specific and gelatinase B-containing granules) but not myeloperoxidase (a marker of azurophil granules) in the granule fraction, and release of lactoferrin (a marker of specific granules) in the extracellular medium. Furthermore, inhibition of Src tyrosine kinases, or phosphoinositide 3-kinase with PP1 or LY294002, respectively, blocked ß2 integrin-induced degranulation and the redistribution of Rap1 and Rap2 to a membrane-enriched fraction. Consequently, the ß2 integrin-dependent exocytosis of specific and gelatinase B-containing granules occurs via a Src tyrosine kinase/phosphoinositide 3-kinase signaling pathway and is responsible for the translocation of Rap1 and Rap2 to the plasma membrane in human neutrophils.
Original languageEnglish
Pages (from-to)642-646
Number of pages5
JournalBiochemical and Biophysical Research Communications
Issue number4
Early online date30 Sept 2008
Publication statusPublished - 28 Nov 2008

ASJC Scopus subject areas

  • Biochemistry
  • Biophysics
  • Cell Biology
  • Molecular Biology


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