The Rap1-RIAM-talin axis of integrin activation and blood cell function

Frederic Lagarrigue, Chungho Kim, Mark H. Ginsberg

Research output: Contribution to journalReview articlepeer-review

96 Citations (Scopus)


Integrin adhesion receptors mediate the adhesion of blood cells, such as leukocytes, to other cells, such as endothelial cells. Integrins also are critical for anchorage of hematopoietic precursors to the extracellular matrix. Blood cells can dynamically regulate the affinities of integrins for their ligands ("activation"), an event central to their functions. Here we review recent progress in understanding the mechanisms of integrin activation with a focus on the functions of blood cells. We discuss how talin binding to the integrin β cytoplasmic domain, in conjunction with the plasma membrane, induces long-range allosteric rearrangements that lead to integrin activation. Second, we review our understanding of how signaling events, particularly those involving Rap1 small guanosine triphosphate (GTP) hydrolases, can regulate the talin-integrin interaction and resulting activation. Third, we review recent findings that highlight the role of the Rap1-GTP-interacting adapter molecule (RIAM), encoded by the APBB1IP gene, in leukocyte integrin activation and consequently in leukocyte trafficking.

Original languageEnglish
Pages (from-to)479-487
Number of pages9
Issue number4
Publication statusPublished - 2016 Jul 28

Bibliographical note

Publisher Copyright:
© 2016 by The American Society of Hematology.

ASJC Scopus subject areas

  • Biochemistry
  • Immunology
  • Hematology
  • Cell Biology


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