____ _ _ _ _
| _ \ ___ | |_ (_) _ __ ___ __| | (_) __ _
| |_) | / _ \ | __| | | | '_ \ / _ \ / _| | | | / _ |
| _ < | __/ | |_ | | | |_) | | __/ | (_| | | | | (_| |
|_| \_\ \___| \__| |_| | .__/ \___| \__,_| |_| \__,_|
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Integrin Ξ²-2
ββββββββββββββββββββββββββββββββββββββββββββββββββββββββββββββββββββββββββββββββββββββββββββββββββββββββββββββββββββββββββββββββββββββββββββββββββββββββββββββββββββββββββββββββββββββββββββββββββββββββββββββββββββββββββββββββββββββββββββββββββββββββββ
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Integrin Ξ²-2 (synonym CD18) ist ein OberflΓ€chenprotein aus der Gruppe der Integrine. Integrine sind Proteine, die Kontakte zwischen Zellen sowie Kontakte einer Zelle zum Gewebeanteil zwischen den Zellen herstellen.
Contents
β’ Eigenschaften
β’ Weblinks
β’ Einzelnachweise
ββββββββββββββββββββββββββββββββββββββββββββββββββββββββββββββββββββββββββββββββββββββββββββββββββββββββββββββββββββββββββββββββββββββββββββββββββββββββββββββββββββββββββββββββββββββββββββββββββββββββββββββββββββββββββββββββββββββββββββββββββββββββββ
Eigenschaften
CD18 bindet an Integrin Ξ±-D, Integrin Ξ±-L, Integrin Ξ±-M oder Integrin Ξ±-X und bildet somit verschiedene Heterodimere. Es wird von Leukozyten gebildet. Als Heterodimer mit Integrin Ξ±-L (synonym CD11a) wird es als LFA-1 bezeichnet und bindet an ICAM 1 bis 4. Gebunden an ICAM3 leitet Ξ±-L/Ξ²-2 die Phagozytose von apoptotischen Neutrophilen durch Makrophagen ein.cite-ref-1[1] Als Heterodimer mit Integrin Ξ±-M (synonym CD11b, zusammen Macrophage-1 antigen genannt) oder Integrin Ξ±-X (synonym CD11c) entstehen Rezeptoren fΓΌr iC3b des Komplementsystems und fΓΌr Fibrinogen. Bei Ξ±-M/Ξ²-2 erfolgt eine Bindung an die Peptide P1 und P2 der Ξ³-Kette des Fibrinogens. Ξ±-M/Ξ²-2 ist weiterhin ein Rezeptor fΓΌr Faktor X. Bei Ξ±-X/Ξ²-2 erfolgt eine Bindung an die Sequenz GPR in der Ξ±-Kette des Fibrinogens. Ξ±-X/Ξ²-2 ist ein Rezeptor fΓΌr ICAM 3 und VCAM1. CD18 ist an der ZytotoxizitΓ€t von NK-Zellen beteiligt.cite-ref-2[2] Es ist an der ZelladhΓ€sion und Leukodiapedese von Leukozytencite-ref-3[3] beteiligt.cite-ref-4[4]cite-ref-5[5] CD18 ist glykosyliert und phosphoryliert.
Weblinks
Einzelnachweise
cite-note-22. β D. F. Barber, M. Faure, E. O. Long: LFA-1 contributes an early signal for NK cell cytotoxicity. In: Journal of Immunology. Band 173, Nummer 6, September 2004, S. 3653β3659, PMID 15356110.
cite-note-33. β Vgl. M. C. Yoder und andere: Pulmonary microcirculatory kinetics of neutrophils deficient in leukocyte-adhesion promoting glykoproteins. In: J Appl Physiol. Band 69, 1990, S. 207β213.
cite-note-44. β G. Ostermann, K. S. Weber, A. Zernecke, A. SchrΓΆder, C. Weber: JAM-1 is a ligand of the beta(2) integrin LFA-1 involved in transendothelial migration of leukocytes. In: Nature Immunology. Band 3, Nummer 2, Februar 2002, S. 151β158, doi:10.1038/ni755, PMID 11812992.
cite-note-55. β J. Xu, X. P. Gao, R. Ramchandran, Y. Y. Zhao, S. M. Vogel, A. B. Malik: Nonmuscle myosin light-chain kinase mediates neutrophil transmigration in sepsis-induced lung inflammation by activating beta2 integrins. In: Nature Immunology. Band 9, Nummer 8, August 2008, S. 880β886, doi:10.1038/ni.1628, PMID 18587400, PMC 2553242 (freier Volltext).
cite-note-pmid10906324-66. β Wixler V, Geerts D, Laplantine E, Westhoff D, Smyth N, Aumailley M, Sonnenberg A, Paulsson M: The LIM-only protein DRAL/FHL2 binds to the cytoplasmic domain of several alpha and beta integrin chains and is recruited to adhesion complexes. In: The Journal of Biological Chemistry. 275. Jahrgang, Nr. 43, Oktober 2000, S. 33669β78, doi:10.1074/jbc.M002519200, PMID 10906324.
cite-note-pmid10352278-88. β Kotovuori A, Pessa-Morikawa T, Kotovuori P, Nortamo P, Gahmberg CG: ICAM-2 and a peptide from its binding domain are efficient activators of leukocyte adhesion and integrin affinity. In: Journal of Immunology. 162. Jahrgang, Nr. 11, Juni 1999, S. 6613β20, PMID 10352278.
cite-note-pmid11279101-99. β Lu C, Takagi J, Springer TA: Association of the membrane proximal regions of the alpha and beta subunit cytoplasmic domains constrains an integrin in the inactive state. In: The Journal of Biological Chemistry. 276. Jahrgang, Nr. 18, Mai 2001, S. 14642β8, doi:10.1074/jbc.M100600200, PMID 11279101.
cite-note-pmid7642561-1010. β Huang C, Springer TA: A binding interface on the I domain of lymphocyte function-associated antigen-1 (LFA-1) required for specific interaction with intercellular adhesion molecule 1 (ICAM-1). In: The Journal of Biological Chemistry. 270. Jahrgang, Nr. 32, August 1995, S. 19008β16, doi:10.1074/jbc.270.32.19008, PMID 7642561.
cite-note-pmid9765275-1111. β Rietzler M, Bittner M, Kolanus W, Schuster A, Holzmann B: The human WD repeat protein WAIT-1 specifically interacts with the cytoplasmic tails of beta7-integrins. In: The Journal of Biological Chemistry. 273. Jahrgang, Nr. 42, Oktober 1998, S. 27459β66, doi:10.1074/jbc.273.42.27459, PMID 9765275.
cite-note-pmid10835351-1212. β Geiger C, Nagel W, Boehm T, van Kooyk Y, Figdor CG, Kremmer E, Hogg N, Zeitlmann L, Dierks H, Weber KS, Kolanus W: Cytohesin-1 regulates beta-2 integrin-mediated adhesion through both ARF-GEF function and interaction with LFA-1. In: The EMBO Journal. 19. Jahrgang, Nr. 11, Juni 2000, S. 2525β36, doi:10.1093/emboj/19.11.2525, PMID 10835351, PMC 212768 (freier Volltext).