Chemokine (C-C motif) ligand 19 (CCL19) is a protein that in humans is encoded by the CCL19gene.[1][2]
This gene is one of several CC cytokine genes clustered on the p-arm of chromosome 9. Cytokines are a family of secreted proteins involved in immunoregulatory and inflammatory processes. The CC cytokines are proteins characterized by two adjacent cysteines. The cytokine encoded by this gene may play a role in normal lymphocyte recirculation and homing. It also plays an important role in trafficking of T cells in thymus, and in T cell and B cell migration to secondary lymphoid organs. It specifically binds to chemokine receptor CCR7.[2]
Chemokine (C-C motif) ligand 19 (CCL19) is a small cytokine belonging to the CC chemokine family that is also known as EBI1 ligand chemokine (ELC) and macrophage inflammatory protein-3-beta (MIP-3-beta). CCL19 is expressed abundantly in thymus and lymph nodes, with moderate levels in trachea and colon and low levels in stomach, small intestine, lung, kidney and spleen.[3] The gene for CCL19 is located on human chromosome 9.[4] This chemokine elicits its effects on its target cells by binding to the chemokine receptor chemokine receptorCCR7.[3] It attracts certain cells of the immune system, including dendritic cells and antigen-engaged B cells,[5][6]CCR7+ central-memory T-Cells.[7]
References
↑Yoshida R, Imai T, Hieshima K, Kusuda J, Baba M, Kitaura M, Nishimura M, Kakizaki M, Nomiyama H, Yoshie O (Jul 1997). "Molecular cloning of a novel human CC chemokine EBI1-ligand chemokine that is a specific functional ligand for EBI1, CCR7". J Biol Chem. 272 (21): 13803–9. doi:10.1074/jbc.272.21.13803. PMID9153236.
↑ 3.03.1Yoshida R, Imai T, Hieshima K, Kusuda J, Baba M, Kitaura M, Nishimura M, Kakizaki M, Nomiyama H, Yoshie O (1997). "Molecular cloning of a novel human CC chemokine EBI1-ligand chemokine that is a specific functional ligand for EBI1, CCR7". J. Biol. Chem. 272 (21): 13803–9. doi:10.1074/jbc.272.21.13803. PMID9153236.
↑Reif K, Ekland EH, Ohl L, Nakano H, Lipp M, Förster R, Cyster JG (2002). "Balanced responsiveness to chemoattractants from adjacent zones determines B-cell position". Nature. 416 (6876): 94–9. doi:10.1038/416094a. PMID11882900.
↑Bromley SK, Thomas SY, Luster AD (2005). "Chemokine receptor CCR7 guides T cell exit from peripheral tissues and entry into afferent lymphatics". Nat. Immunol. 6 (9): 895–901. doi:10.1038/ni1240. PMID16116469.
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