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Department of Hematology, PLA General Hospital, Beijing 100853, China.
LFA-1 and ICAM-1 mediate a bi-directional signaling across the cell membrane which is essential for biological functions of lymphocyte, including exudation, activation, adhesion, immunosurveillance as well as immuno-logical synapse formation. The signal transducing is a dynamic process and dependent on the binding capacity between LFA-1 and ICAM-1. The affinity and the avidity of LFA-1 are two major regulation forms in this process. Phosphorylation of LFA-1 and cytoskeleton protein talin 1 play a critical role in signal transducing. In biology of lymphocyte, LFA-1 and ICAM-1 interaction forms the co-stimulatory signal to promote activation, proliferation and division. In this article the regulation of binding capacity between LFA-1 and ICAM-1, the regulation of LFA-1 subunit phosphorylation, the role of talin1 in signaling transduction of LFA-1 and ICAM-1, the synergic stimulatory signaling of LPA-1 and ICAM-1 were reviewed.
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