function:May play a role in the trafficking of activated/effector T-lymphocytes to inflammatory sites and other aspects of activated T-lymphocyte physiology. Chemotactic for monocytes , dendritic cells and natural killer cells. Mild chemoattractant for primary activated T-lymphocytes and a potent chemoattractant for chronically activated T-lymphocytes but has no chemoattractant activity for neutrophils , eosinophils , and resting T-lymphocytes. Binds to CCR4. Processed forms MDC (3-69) , MDC (5-69) and MDC (7-69) seem not be active. ,online information:CCL22 entry ,PTM:The N-terminal processed forms MDC (3-69) , MDC (5-69) and MDC (7-69) are produced by proteolytic cleavage after secretion from monocyte derived dendrocytes. ,similarity:Belongs to the intercrine beta (chemokine CC) family. ,tissue specificity:Highly expressed in macrophage and in monocyte-derived dendritic cells , and thymus. Also found in lymph node , appendix , activated monocytes , resting and activated macrophages. Lower expression in lung and spleen. Very weak expression in small intestine. In lymph node expressed in a mature subset of Langerhans' cells (CD1a+ and CD83+) . Expressed in Langerhans' cell histiocytosis but not in dermatopathic lymphadenopathy. Expressed in atopic dermatitis , allergic contact dermatitis skin , and psoriasis , in both the eptdermis and dermis. ,
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