Adaptor ADAP (adhesion- and degranulation-promoting adaptor protein) regulates beta1 integrin clustering on mast cells.
Aggregation of the high-affinity IgE receptor (FcepsilonRI) activates a tyrosine phosphorylation cascade needed for enhanced adhesion and degranulation events on mast cells. We previously identified the adaptor ADAP (otherwise known as FYB/SLAP) as a modulator of integrin-mediated adhesion of T-cells and mast cells. However, the molecular basis for the effect on beta1 integrin adhesion on mast cells was unclear. In this study, we demonstrate that ADAP can promote the kinetics of beta1 integrin clustering on mast cells. By contrast, the clustering of the FcepsilonRI receptor was unaffected by transfected ADAP, indicating that the promoting effect on clustering was selective for beta1 integrins. These findings extend the modulatory effect of ADAP from beta2 to beta1 members of the integrin family, and provide a molecular basis for the modulatory effect of ADAP on mast cell adhesion.
Geng
L
L
Division of Tumor Immunology, Dana-Farber Cancer Institute, Boston, Massachusetts, USA.
Rudd
C
C
D048868:Adaptor Proteins, Signal Transducing; D000818:Animals; D002352:Carrier Proteins / Q000235:genetics / Q000378:metabolism*; D002448:Cell Adhesion / Q000502:physiology; D015550:Cell Degranulation / Q000502:physiology; D002460:Cell Line; D019012:Integrin beta1 / Q000378:metabolism*; D007700:Kinetics; D008407:Mast Cells / Q000276:immunology* / Q000378:metabolism*; D016392:Proto-Oncogene Proteins pp60(c-src) / Q000235:genetics / Q000378:metabolism*; D051381:Rats; D011940:Receptor Aggregation / Q000502:physiology; D017455:Receptors, IgE / Q000378:metabolism; D011994:Recombinant Proteins / Q000235:genetics / Q000378:metabolism; D014162:Transfection
D048868:Adaptor Proteins, Signal Transducing; D002352:Carrier Proteins; C491468:Fyb protein, mouse; D019012:Integrin beta1; D017455:Receptors, IgE; D011994:Recombinant Proteins; C490635:SLA protein, human; C490636:Sla protein, rat; D016392:Proto-Oncogene Proteins pp60(c-src)