Integrins a-4/beta-1 (VLA-4) and a-4/beta-7 are receptors for fibronectin. They recognize one or more domains within the alternatively spliced CS-1 and CS-5 regions of fibronectin. They are also receptors for VCAM1. Integrin a-4/beta-1 recognizes the sequence Q-I-D-S in VCAM1. Integrin a-4/beta-7 is also a receptor for MADCAM1. It recognizes the sequence L-D-T in MADCAM1. On activated endothelial cells integrin VLA-4 triggers homotypic aggregation for most VLA-4-positive leukocyte cell lines. It may also participate in cytolytic T-cell interactions with target cells.
Iida J., Meijne A.M.L., Oegema T.R. Jr. J. Biol. Chem. 273:5955-5962(1998)
Liu S., Thomas S.M., Woodside D.G., Rose D.M. Nature 402:676-681(1999)