Anti-CCR4 Antibody Picoband® Fluoro488 Conjugated

CCR4, C-C chemokine receptor type 4 is a protein that in humans is encoded by the CCR4 gene. CCR4 has also recently been designated CD194 (cluster of differentiation 194) . The protein encoded by this gene belongs to the G protein-coupled receptor family. It is a receptor for the following CC chemokines. The CCR4 gene is mapped to chromosome 3. Chemokines are a group of small structurally related proteins that regulate cell trafficking of various types of leukocytes. The chemokines also play fundamental roles in the development, homeostasis, and function of the immune system, and they have effects on cells of the central nervous system as well as on endothelial cells involved in angiogenesis or angiostasis.

A synthetic peptide corresponding to a sequence at the C-terminus of human CCR4, which shares 93.3% amino acid (aa) sequence identity with both mouse and rat CCR4.

Predominantly expressed in the thymus, in peripheral blood leukocytes, including T-cells, mostly CD4+ cells, and basophils, and in platelets; at lower levels, in the spleen and in monocytes. Detected also in macrophages, IL-2-activated natural killer cells and skin-homing memory T-cells, mostly the ones expressing the cutaneous lymphocyte antigen (CLA) . Expressed in brain microvascular and coronary artery endothelial cells.

High affinity receptor for the C-C type chemokines CCL17/TARC, CCL22/MDC and CKLF isoform 1/CKLF1. The activity of this receptor is mediated by G (i) proteins which activate a phosphatidylinositol-calcium second messenger system. Can function as a chemoattractant homing receptor on circulating memory lymphocytes and as a coreceptor for some primary HIV-2 isolates. In the CNS, could mediate hippocampal-neuron survival.

1. Imai, T., Baba, M., Nishimura, M., Kakizaki, M., Takagi, S., Yoshie, O.The T cell-ed CC chemokine TARC is a highly specific biological ligand for CC chemokine receptor 4.J. Biol. Chem. 272: 15036-15042, 1997. 2. Imai, T., Chantry, D., Raport, C. J., Woods, C. L., Nishimura, M., Godiska, R., Yoshie, O., Gray, P. W.Macrophage-derived chemokine is a functional ligand for the CC chemokine receptor 4.J. Biol. Chem. 273: 1764-1768, 1998. 3. Oo, Y. H., Weston, C. J., Lalor, P. F., Curbishley, S. M., Withers, D. R., Reynolds, G. M., Shetty, S., Harki, J., Shaw, J. C., Eksteen, B., Hubscher, S. G., Walker, L. S. K., Adams, D. H.Distinct roles for CCR4 and CXCR3 in the recruitment and positioning of regulatory T cells in the inflamed human liver.J. Immun. 184: 2886-2898, 2010.