6shr

Structural highlights

Function

SDF1_HUMAN Chemoattractant active on T-lymphocytes, monocytes, but not neutrophils. Activates the C-X-C chemokine receptor CXCR4 to induce a rapid and transient rise in the level of intracellular calcium ions and chemotaxis. Also binds to another C-X-C chemokine receptor CXCR7, which activates the beta-arrestin pathway and acts as a scavenger receptor for SDF-1. SDF-1-beta(3-72) and SDF-1-alpha(3-67) show a reduced chemotactic activity. Binding to cell surface proteoglycans seems to inhibit formation of SDF-1-alpha(3-67) and thus to preserve activity on local sites. Acts as a positive regulator of monocyte migration and a negative regulator of monocyte adhesion via the LYN kinase. Stimulates migration of monocytes and T-lymphocytes through its receptors, CXCR4 and CXCR7, and decreases monocyte adherence to surfaces coated with ICAM-1, a ligand for beta-2 integrins. SDF1A/CXCR4 signaling axis inhibits beta-2 integrin LFA-1 mediated adhesion of monocytes to ICAM-1 through LYN kinase. Inhibits CXCR4-mediated infection by T-cell line-adapted HIV-1. Plays a protective role after myocardial infarction. Induces down-regulation and internalization of CXCR7 expressed in various cells. Has several critical functions during embryonic development; required for B-cell lymphopoiesis, myelopoiesis in bone marrow and heart ventricular septum formation.^{[1] [2] [3] [4] [5] [6]}

See Also

• C-X-C motif chemokine 3D structures

References

1. ↑ Oberlin E, Amara A, Bachelerie F, Bessia C, Virelizier JL, Arenzana-Seisdedos F, Schwartz O, Heard JM, Clark-Lewis I, Legler DF, Loetscher M, Baggiolini M, Moser B. The CXC chemokine SDF-1 is the ligand for LESTR/fusin and prevents infection by T-cell-line-adapted HIV-1. Nature. 1996 Aug 29;382(6594):833-5. PMID:8752281 doi:10.1038/382833a0
2. ↑ Moepps B, Braun M, Knopfle K, Dillinger K, Knochel W, Gierschik P. Characterization of a Xenopus laevis CXC chemokine receptor 4: implications for hematopoietic cell development in the vertebrate embryo. Eur J Immunol. 2000 Oct;30(10):2924-34. PMID:11069075
3. ↑ Braun M, Wunderlin M, Spieth K, Knochel W, Gierschik P, Moepps B. Xenopus laevis Stromal cell-derived factor 1: conservation of structure and function during vertebrate development. J Immunol. 2002 Mar 1;168(5):2340-7. PMID:11859124
4. ↑ Balabanian K, Lagane B, Infantino S, Chow KY, Harriague J, Moepps B, Arenzana-Seisdedos F, Thelen M, Bachelerie F. The chemokine SDF-1/CXCL12 binds to and signals through the orphan receptor RDC1 in T lymphocytes. J Biol Chem. 2005 Oct 21;280(42):35760-6. Epub 2005 Aug 17. PMID:16107333 doi:M508234200
5. ↑ Malik M, Chen YY, Kienzle MF, Tomkowicz BE, Collman RG, Ptasznik A. Monocyte migration and LFA-1-mediated attachment to brain microvascular endothelia is regulated by SDF-1 alpha through Lyn kinase. J Immunol. 2008 Oct 1;181(7):4632-7. PMID:18802065
6. ↑ Kalatskaya I, Berchiche YA, Gravel S, Limberg BJ, Rosenbaum JS, Heveker N. AMD3100 is a CXCR7 ligand with allosteric agonist properties. Mol Pharmacol. 2009 May;75(5):1240-7. doi: 10.1124/mol.108.053389. Epub 2009 Mar , 2. PMID:19255243 doi:10.1124/mol.108.053389