Lymphocyte function-associated antigen 1

Lymphocyte function-associated antigen 1, also known as LFA-1 is found on all T-cells and also on B-cells, macrophages and neutrophils and is involved in recruitment to the site of infection. It binds to ICAM-1 on antigen-presenting cells and functions as an adhesion molecule. LFA-1 is the first to bind T-cells to antigen-presenting cells and initially binds weakly. A signal from the T-cell receptor and/or the cytokine receptor changes the conformation and prolongs the cell contact, allowing the T-cell to proliferate.

LFA-1 is part of the family of leukocyte integrins that are recognised by their common β-chains (CD18). LFA-1 also has a distinct α-chain (CD11a).

See also

• Leukocyte adhesion deficiency

Further reading

• Janeway, Travers, Walport, Shlomchik, Immunobiology 6th ed. (2005) Garland Science:NY
• Parham, Peter, The Immune System 3rd ed. (2009) Garland Science: London and New York

External links

• MeSH LFA-1
• Davignon D, Martz E, Reynolds T, Kürzinger K, Springer TA (1981). "Lymphocyte function-associated antigen 1 (LFA-1): a surface antigen distinct from Lyt-2,3 that participates in T lymphocyte-mediated killing". Proc. Natl. Acad. Sci. U.S.A. 78 (7): 4535–9. doi:10.1073/pnas.78.7.4535. PMID 7027264. 
• ITGAL ITGB2 Info with links in the Cell Migration Gateway