The FlowCellect™ GPCR identification kits are designed for flow cytometry applications, which can be used for the identification and quantification of the surface expression level of GPCRs on any cells. The kit uses a GPCR antibody validated for flow cytometry to detect receptor expression, and also includes both positive and negative control cells with well characterized receptor expression levels for the purpose of quantification.
Chemokine receptors are very attractive targets because they are highly expressed on immune cells and regulate leukocyte activation and trafficking. Many of these targets have been indicated to play a key role in certain diseases states such as HIV infection, Rheumatoid Arthritis, and Diabetes. The expression levels of these receptors often reflect the different states of infectious diseases and inflammation.
Chemokine receptors are seven transmembrane G-Protein coupled receptors (GPCRs). The chemokine receptor family comprises of eighteen GPCR targets, in which ten are CC chemokine receptors, seven are CXC chemokine receptors, and one is a CX3C chemokine receptor. Currently, Millipore has launched 12 GPCR surface identification kits with an initial focus on the chemokine receptor family.
CCR1 is a member of the chemokine receptor family; the ligands for CCR1 include MIP-1, RANTES, MCP-3, HCC-1, HCC-2, HCC-4, and MPIF-1 [8]. CCR1 is widely expressed in many types of hematopoietic cells such as lymphocytes, macrophages, dendritic cells, and GM-CSF-activated neutrophils express CCR1 [2, 6]. Pharmacological and genetic targeting of CCR1, either alone or in combination with cyclosporin A, reduces cardiac and renal allograft rejection [3, 4, 5], allergic encephalomyelitis [7], and renal fibrosis [1] in experimental models.
The control cells provided in the kit are based on the commercially available ChemiScreen™ GPCR stable cell lines from Millipore. Both the positive and negative control cell lines have been fully characterized using Pharmacology techniques such as radioligand binding assay to determine the receptor number for each cell type [9]. Using this information, now the researcher can determine the number of receptors per cell on any given cell type.