Editing CCL19

'''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 in various tissues, including the [[thymus]] and [[lymph nodes]], and exerts its effects on [[immune cells]] through CCR7, a G protein-coupled receptor related to chemokines.

==Structure==
CCL19 is a small protein of 8-10 kilodaltons, composed of approximately 70-80 amino acids. The protein has a typical chemokine fold, with a flexible N-terminus followed by a three-stranded beta-sheet and a C-terminal alpha-helix.

==Function==
CCL19 is involved in several immune responses. It is a chemoattractant for [[dendritic cells]], [[T cells]], and [[B cells]], and plays a crucial role in guiding these cells to lymphoid tissues. CCL19 also plays a role in the homing of T cells to the thymus during their development.

==Clinical significance==
Alterations in the expression or function of CCL19 have been implicated in a variety of diseases, including [[autoimmune diseases]], [[cancer]], and [[HIV]] infection. In autoimmune diseases, overexpression of CCL19 can lead to the recruitment of autoreactive T cells, contributing to tissue damage. In cancer, CCL19 can promote tumor growth and metastasis by attracting tumor-associated macrophages. In HIV infection, CCL19 can attract HIV-infected cells, facilitating the spread of the virus.

==See also==
* [[Chemokine]]
* [[Cytokine]]
* [[CCR7]]
* [[Dendritic cell]]
* [[T cell]]
* [[B cell]]

[[Category:Chemokines]]
[[Category:Cytokines]]
[[Category:Immunology]]

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