LFA-1

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LFA-1 stands for Lymphocyte function-associated antigen-1.

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, it is the first to bind T-cells to antigen-presenting cells and initially binds weakly. A signal from the T-cell 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 which 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

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. PMID 7027264.

v • d • e Transmembrane receptors: immune receptors
Cytokine receptor	Type I: interleukin (IL-2, IL-3) - CSF (Erythropoietin, GM-CSF, G-CSF) - Glycoprotein 130/Oncostatin M - Leukemia inhibitory factor - common subunits (Common gamma chain, CSF2RB) Type II: interleukin (IL22RA2) - interferon (IFNAR, IFNGR) Other: Chemokine - TGF-beta - Tumor necrosis factor
Pattern recognition/Toll-like	TLR 1 - TLR 2 - TLR 3 - TLR 4 - TLR 5 - TLR 6 - TLR 7 - TLR 8 - TLR 9 - TLR 10
Fc receptor	ε (FcεRI, FcεRII) - γ (FcγRI, FcγRII, FcγRIII) - α/μ (FcαRI, Fcα/μR) - Neonatal
Lymphocyte homing receptor	CD44 - L-selectin - VLA-4 - LFA-1
other	Antigen receptor (B-cell, T cell) - Complement - Formyl peptide - Immunophilins - Integrin - Killer-cell immunoglobulin-like - Scavenger

v • d • e Membrane proteins: cell adhesion molecules
IgSF	N-CAM (Myelin protein zero) - ICAM (1, 4) - VCAM-1 - PE-CAM - L1-CAM
Cadherins	Desmoglein - T-cadherin
Selectins	E-selectin - L-selectin - P-selectin
Integrins	LFA-1 - Integrin alphaXbeta2 - Macrophage-1 antigen - VLA-4 - Glycoprotein IIb/IIIa (Note: integrins not always classified as CAMs)
Other	Carcinoembryonic antigen - CD22 - CD24 - CD44 - CD146 - CD164

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Acknowledgement and Attribution Regarding Sources of Content

Some of the initial content on this page may be incorporated in part from copyleft sources in the public domain including wikis such as Wikipedia and AskDrWiki. Drug information for patients came from the The National Library of Medicine. Infectious disease information may have come from the Centers for Disease Control (CDC). Differential Diagnoses are drawn from clinicians as well as an amalgamation of 3 sources: 1.The Disease Database; 2. Kahan, Scott, Smith, Ellen G. In A Page: Signs and Symptoms. Malden, Massachusetts: Blackwell Publishing, 2004:3; 3. Sailer, Christian, Wasner, Susanne. Differential Diagnosis Pocket. Hermosa Beach, CA: Borm Bruckmeir Publishing LLC, 2002:7 .