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CC chemokine receptors

CCR1
Identifiers
Symbol	CCR1
Entrez	1230
HUGO	1602
OMIM	601159
RefSeq	NM_001295
UniProt	P32246
Other data
Locus	Chr. 3 p21

CCR2
Identifiers
Symbol	CCR2
Entrez	1231
HUGO	1603
OMIM	601268
PDB	1KAD
RefSeq	NM_000647
UniProt	P41597
Other data
Locus	Chr. 3 p21

CCR3
Identifiers
Symbol	CCR3
Entrez	1232
HUGO	1604
OMIM	601268
RefSeq	NM_001837
UniProt	P51677
Other data
Locus	Chr. 3 p21

CCR4
Identifiers
Symbol	CCR4
Entrez	1233
HUGO	1605
OMIM	604836
RefSeq	NM_005508
UniProt	P51679
Other data
Locus	Chr. 3 p24

CCR5
Identifiers
Symbol	CCR5
Entrez	1234
HUGO	1606
OMIM	601373
PDB	1ND8
RefSeq	NM_000579
UniProt	P51681
Other data
Locus	Chr. 3 p21

CCR6
Identifiers
Symbol	CCR6
Entrez	1235
HUGO	1607
OMIM	601835
RefSeq	NM_004367
UniProt	P51684
Other data
Locus	Chr. 6 q27

CCR7
Identifiers
Symbol	CCR7
Entrez	1236
HUGO	1608
OMIM	600242
RefSeq	NM_001838
UniProt	P32248
Other data
Locus	Chr. 17 q12-q21.2

CCR8
Identifiers
Symbol	CCR8
Entrez	1237
HUGO	1609
OMIM	601834
RefSeq	NM_005201
UniProt	P51685
Other data
Locus	Chr. 3 p22

CCR9
Identifiers
Symbol	CCR9
Entrez	10803
HUGO	1610
OMIM	604738
RefSeq	NM_031200
UniProt	P51686
Other data
Locus	Chr. 3 p21

CCR10
Identifiers
Symbol	CCR10
Entrez	2826
HUGO	4474
OMIM	600240
RefSeq	NM_016602
UniProt	P46092
Other data
Locus	Chr. 17 17q21.1-q21

CC chemokine receptors are integral membrane proteins that specifically bind and respond to cytokines of the CC chemokine family. They represent one subfamily of chemokine receptors, a large family of G protein-linked receptors that are known as seven transmembrane (7-TM) proteins since they span the cell membrane seven times. To date, ten true members of the CC chemokine receptor subfamily have been described. These are named CCR1 to CCR10 according to the IUIS/WHO Subcommittee on Chemokine Nomenclature.

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Mechanism

The CC chemokine receptors all work by activating the G protein G_i^[1].

CCR1

CCR1 was the first CC chemokine receptor identified and binds multiple inflammatory/inducible (see inducible gene) CC chemokines (including CCL4, CCL5, CCL6, CCL14, CCL15, CCL16 and CCL23).^[2]^[3]^[4]^[5] In humans, this receptor can be found on peripheral blood lymphocytes and monocytes. There is some suggestion that this chemokine receptor is restricted to memory T-cells within the lymphocyte pool. This receptor is also designated cluster of differentiation marker CD191.

CCR2

CCR2 can interact with CCL2, CCL8 and CCL16 and has been identified on the surface of monocytes, activated memory T cells, B cells, and basophils in humans, and also in peritoneal macrophages in mice.^[4]^[6] CCR2 is also designated CD192.

CCR3

CCR3 is a receptor for multiple inflammatory/inducible CC chemokines, including CCL11, CCL26, CCL7, CCL13, CCL15, CCL24 and CCL5 that attract eosinophils, and CCL28 that attracts B and T lymphocytes to mucosal tissues.^[3]^[7]^[8]^[9]^[10] It is most highly expressed in both eosinophils and basophils, but can also be found in Th1 and Th2 cells and airway epithelial cells. Thus CCR3 plays a role in allergic reactions. CCR3 is also known as CD193.

CCR4

CCR4 is expressed on Th2 T lymphocytes and is up-regulated by T cell receptor activation. However, some reports suggest a role for this receptor also in trafficking of dendritic cells. The CC chemokines CCL3, CCL5, CCL17 and CCL22 signal through this receptor.^[11]^[12]

CCR5

CCR5 is expressed on several cell types including peripheral blood-derived dendritic cells, CD34+ hematopoietic progenitor cells and certain activated/memory Th1 lymphocytes. This receptor is well defined as a major coreceptor implicated in susceptibility to HIV-1 infection and disease. This receptor has several CC chemokine ligands including CCL2, CCL3, CCL4, CCL5, CCL11, CCL13, CCL14 and CCL16.^[4]^[13]^[6]^[14]

CCR6

CCR6, a receptor for CCL20, is expressed on unactivated memory T-cells and some dendritic cells. CCR6 is also expressed on Th17 cells.^[15] CCR6 is down-regulated in activated T-cells.^[16]

CCR7

CCR7 is a highly important receptor with a role in trafficking of B and T lymphocytes and dendritic cells to and across high endothelial venules and positioning those cells correctly in T cell zones of secondary lymphoid organs. Its ligands include the related chemokines CCL19 and CCL21, (previously called ELC and SLC).^[17]

CCR8

CCR8 is associated with Th2 lymphocytes and is therefore found predominantly in the thymus (in humans) although some expression can be found in the brain, spleen, lymph node, and monocytes at the nucleotide level. The ligands for this receptor are CCL1 and CCL16.^[18]

CCR9

CCR9 was previously called orphan receptor GPR 9-6 and is very highly expressed in thymus (on both immature and mature T-cells) while low in lymph nodes and spleen. CCR9 is also abundant in the gut, with its expression associated with T cells of the intestine. The specific ligand of this receptor is CCL25.^[19] To note, the chemokine binding protein D6 had previously been named CCR9, but this molecule is a scavenger receptor not a true (signaling) chemokine receptor.

CCR10

CCR10 is receptor for CCL27 and CCL28 that was originally called orphan receptor GPR2.^[20]^[21]^[22]^[9] CCR10 has been implicated in inflammation of the skin, and has been shown to recruit regulatory T cells (Tregs) to mucosal layers.

CCR11

This molecule was originally designated CCR11 due to its ability to bind several CC chemokines (including CCL19, CCL21 and CCL25) and its structural similarity to chemokine receptors. However, due to the inability of this molecule (also known as CCRL1 and CCX CKR) to generate a signal following ligand interaction, it has been suggested that it is a scavenger receptor for chemokines and not a bonafide chemokine receptor. Thus CCRL1 should not be called CCR11 under the guidelines of the IUIS/WHO Subcommittee on Chemokine Nomenclature.

References

^ senselab
^ Ma et al. The C10/CCL6 chemokine and CCR1 play critical roles in the pathogenesis of IL-13-induced inflammation and remodeling. J Immunol. 2004 Feb 1;172(3):1872-81.
^ ^a ^b Youn et al Molecular cloning of leukotactin-1: a novel human beta-chemokine, a chemoattractant for neutrophils, monocytes, and lymphocytes, and a potent agonist at CC chemokine receptors 1 and 3. J. Immun. 159: 5201-5205, 1997.
^ ^a ^b ^c Nomiyama et al. Human CC chemokine liver-expressed chemokine/CCL16 is a functional ligand for CCR1, CCR2 and CCR5, and constitutively expressed by hepatocytes. Int Immunol. 2001 Aug;13(8):1021-9.
^ Berahovich et al. Proteolytic Activation of Alternative CCR1 Ligands in Inflammation. J. Immunol. 174:7341-7351, 2005.
^ ^a ^b Ogilvie et al. Eotaxin is a natural antagonist for CCR2 and an agonist for CCR5. Blood. 2001, 97:1920-4
^ Kitaura et al. Molecular cloning of human eotaxin, an eosinophil-selective CC chemokine, and identification of a specific eosinophil eotaxin receptor, CC chemokine receptor 3. J. Biol. Chem. 1996, 271:7725-7730.
^ Kitaura et al. Molecular cloning of a novel human CC chemokine (Eotaxin-3) that is a functional ligand of CC chemokine receptor 3. J. Biol. Chem. 274:27975-27980, 1999.
^ ^a ^b Pan et al. 2000, A novel chemokine ligand for CCR10 and CCR3 expressed by epithelial cells in mucosal tissues, J. Immunol. 165: 2943–2949.
^ White et al. Cloning and functional characterization of a novel human CC chemokine that binds to the CCR3 receptor and activates human eosinophils. J. Leukoc. Biol. 62:667-675, 1997.
^ Imai et al. The T cell-directed CC chemokine TARC is a highly specific biological ligand for CC chemokine receptor 4. J. Biol. Chem. 272: 15036-15042, 1997.
^ Imai et al. Macrophage-derived chemokine is a functional ligand for the CC chemokine receptor 4. J. Biol. Chem. 273:1764-1768 (1998).
^ Gong et al., Monocyte Chemotactic Protein-2 Activates CCR5 and Blocks CD4/CCR5-mediated HIV-1 Entry/Replication. J Biol Chem, 1998, 273,4289-4292.
^ Blanpain et al., CCR5 binds multiple CC-chemokines: MCP-3 acts as a natural antagonist. Blood. 1999, 94:1899-905.
^ Acosta-Rodriguez et al., Surface phenotype and antigenic specificity of human interleukin 17–producing T helper memory cells. Nat. Immunology, 2007, 6, 639-646.
^ Baba et al., Identification of CCR6, the specific receptor for a novel lymphocyte-directed CC chemokine LARC. J Biol Chem. 1997, 272:14893-8.
^ Yoshida et al. Molecular cloning of a novel human CC chemokine EBI1-ligand chemokine that is a specific ligand for EBI1, CCR7. J. Biol. Chem. 272: 13803-13809, 1997.
^ Roos et al., Identification of CCR8, the receptor for the human CC chemokine I-309. J Biol Chem 1997 Vol 272, 17251–4.
^ Zaballos et al., Identification of the orphan chemokine receptor GPR-9-6 as CCR9, the receptor for the chemokine TECK. J. Immunol., 1999, 162:5671-5675.
^ Gosling et al., Cutting edge: identification of a novel chemokine receptor that binds dendritic cell- and T cell-active chemokines including ELC, SLC, and TECK. J Immunol. 2000, 164:2851-6.
^ Homey et al. The orphan chemokine receptor G protein-coupled receptor-2 (GPR-2, CCR10) binds the skin-associated chemokine CCL27 (CTACK/ALP/ILC). J. Immunol. 164:3465-3470, 2000.
^ Wang et al. 2000, Identification of a novel chemokine (CCL28), which binds CCR10 (GPR2). J. Biol. Chem. 275: 22313–22323.

v • d • e G protein-coupled receptors, cytokine receptors: chemokine receptors
CC chemokine receptors	CCR1 - CCRL1 - CCR2 - CCRL2 - CCR3 - CCR4 - CCR5 - CCR6 - CCR7 - CCR8 - CCR9 - CCR10
CXC chemokine receptors	CXCR1 - CXCR2 - CXCR3 - CXCR4 - CXCR5 - CXCR6 - CXCR7
Other	CCBP2 - CMKLR1 - CX3CR1 - XCR1

Categories: Cell signaling | Signal transduction | Chemokine receptors

This article is licensed under the GNU Free Documentation License. It uses material from the Wikipedia article "CC_chemokine_receptors". A list of authors is available in Wikipedia.