Based on the classic model of chemokine receptor activation, ligand binding promotes stabilization of a single active confor- mation of the receptor that . Chemokine-induced macrophage recruitment into the vascular wall is an early pathological event in the progression of atherosclerosis. CCX-CKR is an atypical chemokine receptor with high affinity for CCL19, CCL21, and CCL25 chemokines, but is not known to activate intracellular signaling pathways. Heterotrimeric G-protein-coupled receptors (GPCRs) are key mediators of intracellular signalling, control numerous physiological processes, and are one of the largest class of proteins to be pharmacologically targeted. In fully developed mammalian organisms, these mechanisms are vital to . MIF . Chemokine receptor signaling pathways are implicated in the pathobiology of renal cell carcinoma (RCC). In certain cases, chemokine receptor signaling also activates LMW G proteins (Ras/Rho), which mediate many actin-dependent processes, such as degranulation and chemotaxis. Results Experimental design to identify the phosphorylation events underlying CCR2 activation. Receptor internalization Transcription Cell migration proliferation Chemotaxis Cell migration Inhibit apoptosis Stat GRK Chemokine GPCR Chemokine Chemokine Chemokine GPCR GPCR GPCR β-arrestin JAK Gγ Gγ PLCβ PIP3 cAMP GTP AA Prostaglandins PIP2 GTP IP3 DAG CaM Ras AC Gαi RGS EPAC Rap1 PLA2 COX-2 Gβ Gβ Rho PKC PYK2 PI3K Src Raf-1 PKA PI3K MEK1/2 ERK1/2 PDK PTEN Akt/PKB Gαq Ca2+ Chemokine . Chemokine receptors are cytokine receptors found on the surface of certain cells that interact with a type of cytokine called a chemokine. Induction of nitric oxide . CCR2 is expressed on monocytes, immature dendritic cells, and T-cell subpopulations, and mediates their migration towards endogenous CC chemokine ligands such as CCL2 (ref. Chemokine signaling is essential for coordinated cell migration in health and disease to specifically govern cell positioning in space and time. Various members of small GTPases are involved in this process. Chemokine receptors represent a family of seven-transmembrane spanning, G-protein-coupled receptors which interact with chemotactic cytokines termed chemokines. Bias in chemokine receptor signalling Abstract Chemokine receptors are widely expressed on a variety of immune cells and play a crucial role in normal physiology as well as in inflammatory and infectious diseases. Chemokine receptors associate with G-proteins to transmit cell signals following ligand binding. Various members of small GTPases are involved in this process. Chemokine Signaling Chemokine receptors associate with G-proteins to transmit cell signals following ligand binding. PubMed. Thus, chemokine receptor signaling through a range of second messenger molecules potentially expands an individual chemokine receptor's ability to control qualitatively different cellular responses. We tested this hypothesis in mice deficient in IL-17R signaling using IL-17R knockout (KO) mice or mice overexpressing a soluble IL-17R:Fc fusion protein to exclude . Chemokine receptors are usually linked to a G-protein through which they signal. CCR1 is a chemokine receptor that responds to a large number of CC chemokines including CCL3 (MIP-1alpha), CCL5 (RANTES), CCL7 (MCP-3), CCL9 (MIP-1gamma), CCL15 (MIP1 delta), CCL23 (MIP-3), and with low affinity to CCL4 (MIP-1 beta) and CCL8 (MCP-2 . One of the best systems demonstrating endogenous biased agonism is the chemokine system. B Holst, et al., A conserved aromatic lock for the tryptophan rotameric switch in TM-VI of seven-transmembrane receptors. For example, Cxcr4 expression in hematopoietic . The in-depth study of chemokine receptors will serve as the theoretical and experimental basis for the treatment of HIV/AIDS. 4 , 5 it has over expression in a variety of malignant tumors, such as breast cancer, lung cancer, ovarian cancer, and liver cancer tissues. SOCS (suppressor of cytokine signaling)-3 is a negative regulator of cytokine-driven responses, contributing to interferon-α resistance commonly used to treat advanced RCC . Google Scholar. AU - Fu, Kai. Chemokine Receptor Signaling and the Hallmarks of Cancer Abstract The chemokines are a family of chemotactic cytokines that mediate their activity by acting on seven-transmembrane-spanning G protein-coupled receptors. Unlike canonical G protein-coupled receptors (GPCRs), ACKR3 does not couple to heterotrimeric G proteins when activated by its endogenous ligand, CXCL12. Following binding of the chemokine ligand, chemokine receptors associate with G-proteins, allowing the exchange of GDP for another . Atypical chemokine receptor CXCR7 (ACKR3) functions as a scavenger receptor for chemokine CXCL12 12,13 or trigger β-arrestin-dependent signaling 14, a molecule that promotes developmental and pathological angiogenesis 15. The existence of 23 chemokine receptors and 48 chemokine ligands guarantees a tight control and fine-tuning of the immune system. After receptor activation, the alpha- and beta-gamma-subunits of G protein dissociate to activate diverse downstream pathways resulting in cellular polarization and actin reorganization. Chemokine receptor triggering results in the onset of complex intracellular signaling cascades leading to cell polarization and migration towards the chemokine source ( Thelen and Stein, 2008 ). For example, the chemokines RANTES, eotaxin, and MCP-1 have been linked to eosinophil activation and recruitment to the lungs of allergic asthmatic patients. Chemokines as Drivers and . In order for a cell to respond to a chemokine it must express a complementary chemokine receptor.Chemokine receptors belong to the vast family of G-protein coupled receptors (GPCRs): seven transmembrane receptors which bind extracellular ligands and consequently initiate intracellular signalling.When a chemokine binds its receptor a calcium signalling cascade is created, resulting in the . Chemokine receptor signaling can also induce apoptosis in tumor-infiltrating T cells, which will be discussed later as an immune evasion mechanism. Activation of G proteins, by chemokine receptors, causes the subsequent activation of an enzyme known as phospholipase C (PLC). Androgen receptor and chemokine receptors 4 and 7 form a signaling axis to regulate CXCL12-dependent cellular motility. The receptor N-terminus is external and contributes to ligand binding while the carboxy terminus (COOH) allows for interaction with signaling molecules and downstream signaling. The receptor C-X-C motif chemokine receptor 3 (CXCR3) has three endogenous ligands: CXCL9, CXCL10, and CXCL11. However, CCX-CKR acts as decoy receptor and efficiently . The G protein-coupled receptor (GPCR) C-X-C chemokine receptor 3 (CXCR3) is a potential drug target that mediates signaling involved in cancer metastasis and inflammatory diseases. Model of chemokine receptor activation and signal transduction for IL-8 and neutrophils 5 6. However, it has been known . Here we review our current understanding of the pathways involved in both CXC chemokine receptor signaling in other cell types, most notably neutrophils, and similar pathways operant during hepatocyte proliferation/liver regeneration to formulate a basis for the function of CXC chemokine . Cross-desensitization studies and single-receptor transfected cells revealed that subfamily of alpha chemokine receptors CXCR5 and CXCR3 mediated the chemotactic effect of IRBP, while only CXCR3 was required for the chemotactic response to S-Ag. The chemokines (or chemotactic cytokines) are a large family of small, secreted proteins that signal through cell surface G protein-coupled heptahelical chemokine receptors. CXCL8 is the first chemokine with a determined 3D structure [], and it is the most important member of the ELR + CXC chemokines [[6, 7]]. 3 Interactions within the chemokine ligand/receptor network are characterized by redundancy and promiscuity, with many chemokines binding to more than one receptor and vice versa. Current study . J Biol Chem 285, 3973-3985 (2010 . chemokine receptors can initiate signal pathways that cause tumor proliferation, differentiation, invasion, and metastasis. The CKBPs may have broad chemokine binding specificity, such as the poxvirus 35-kDa protein, the gammaherpesvirus M3 protein orthe MYXVM-. 6 breast cancer cells can produce many chemokines, and express a variety of … CCR6 antagonist would be a potential treatment for inflammatory diseases such as psoriasis or rheumatoid arthritis. When the molecule GDP is bound to the G-protein subunit, the G-protein is in an inactive state. We have previously generated a CCR2-expressing cell . CCR2 and its ligands are implicated in numerous inflammatory and . AU - Qu, Lintao. 28. Biased agonism, the ability of different ligands for the same receptor to selectively activate some signaling pathways while blocking others, is now an established paradigm for G protein-coupled receptor signaling. Three non-signaling mammalian 7TM chemokine binding proteins have also been identified: the Duffy Antigen Receptor for Chemokines (DARC) that binds both CC and CXC chemokines with high affinity and serves as the receptor for Plasmodium vivax, D6 and CCX CKR. Chemokine receptors are well known to form heterodimeric complexes. It is therefore a naturally occurring fully arrestin biased receptor. These results highlight the concept that survival or apoptotic signals provided by chemokines could be cell type specific and/or the result of a cell context-dependent cross-communication with yet unknown signals. Transcriptional and cell-surface expression of CCR-1 and -5 were previously shown in various types of human DC ( 19 , 38 - 44 ). CCL25 binding led to interactions between CCR9 G βγ and PI3K, which resulted in activation of Akt . In addition, BCR signaling in the lymphatic tissue microenvironment promotes the clonal expansion of normal and malignant B cells. ACKR3 however . However, little is known about the signaling pathways used by CXC chemokine receptors in hepatocytes. Chemokines receptors are seven transmembrane spanning G protein-coupled receptors that allow cells to migrate towards increasing chemokine gradients. In this study, glycogen synthase kinase 3 β (GSK-3β) and forkhead in human rhabdomyosarcoma (FKHR) were demonstrated to be downstream targets of Akt , which further influenced the migration, invasion and drug resistance of . Here, we showed that CXCL10 and CXCR3 mRNA, protein, and signaling activity were upregulated in the dorsal root ganglion after contact hypersensitivity (CHS), a murine model of ACD, induced by squaric acid dibutylester. We find that CCR7 signaling, initiated at the plasma membrane, is translocated by . Chemokine receptor signaling combine with advances in advanced clinicopathological characteristics have provided new insights into the molecular landscape of prostate cancer. However, the clinical relevance of CXCR2 receptor, mediating the effects of all angiogenic chemokines, remains unclear. Conversely, ectopic expression of CXCR2 results in premature senescence via a p53-dependent mechanism. Signaling domains of the intracellular tails of . Chemokine receptor-mediated signaling pathways are involved in HIV-1 infection. The G protein-coupled chemokine receptor 9 (CCR9) and its ligand chemokine 25 (CCL25) comprise a signaling axis that is particularly important for the small intestine and colon. Chemokine receptor (CKR) signaling forms the basis of essential immune cellular functions, and dysregulated CKR signaling underpins numerous disease processes of the immune system and beyond. This includes overall helical movements and the contributions of micro-switches based on recently published 7TM crystals and molecular dynamics studies. Most chemokine receptors bind to more than one chemokine, and many chemokines act as biased agonists of their receptors . John H Kehrl. Downstream signaling of chemokine receptor 9/chemokine ligand 25. Intracellular signaling by chemokine receptors is dependent on neighbouring G-proteins. Chemokine receptors form a large subfamily of G protein-coupled receptors that predominantly activate heterotrimeric Gi proteins and are involved in immune cell migration. Examination of the relationships between chemoattraction and the ability to elicit pathology at the protein or peptide levels in the mouse uveitis . Closely related to these are the chemokine binding proteins, which include three 7-transmembrane-type proteins that bind chemokines, but lack a known signaling function. G-proteins exist as a heterotrimer; they are composed of three distinct subunits. 3.4. On the molecular level, chemokines can elicit different or biased intracellular signaling pathways. In many cases, the same chemokine receptor is expressed in different cell types, where it initiates very different types of biological responses. Based on these data we hypothesized that IL-17R signaling is critical for lung CXC chemokine generation, induction of G-CSF, a cytokine required for ongoing neutrophil production in response to infection, and lung host defense 13. Unlike canonical G protein-coupled receptors (GPCRs), ACKR3 does not couple to heterotrimeric G proteins when activated by its endogenous ligand, CXCL12. Although a large number of chemokine receptor antagonists are developed to target the different stages of . CXCL10 . They are best known for their ability to stimulate the migration of cells, most notably white blood cells (leukocytes). Request PDF | Chemokine Receptor Signaling and HIV Infection | The primary function of HIV-1 binding to its chemokine coreceptors is to mediate fusion and viral entry. Refer to the table below the pathway to see the alternate names for each chemokine, their reported receptor binding specificities, and their primary immunoregulatory functions. A broad array of biological responses, including cell polarization, movement, immune and inflammatory responses, and prevention of HIV-1 infection, are triggered by the chemokines, a family of structurally related chemoattractant proteins that bind to specific seven-transmembrane receptors linked to G proteins. CCL25 binding promotes CCR9 G βγ interaction with . Secondly, ACKR3 may form heterodimers with CD74 or another unknown receptor of DDT that influence downstream signaling of ACKR3. Chemokines bind and activate chemokine receptors, G protein-coupled receptors (GPCRs) embedded in the cell membranes of leukocytes, thereby inducing leukocyte adhesion to the vessel wall, morphological changes, extravasation into the inflamed tissue, and chemotaxis along the chemokine gradient to the site of injury or infection. Ligand binding to and activation of CCR7 leads to its phosphorylation by GRKs that recruit β-arrestin . Cells undergoing OIS secrete multiple CXCR2-binding chemokines in a program that is regulated by the NF-kappaB and . Atypical chemokine receptor 3 (ACKR3) is a seven transmembrane (TM) spanning heptahelical receptor that is involved in different stages of cancer progression. CCR7 signaling activates the mitogen-activated protein kinase signaling module leading to chemotaxis, whereas the Rho-coffilin signaling axis is involved in controlling the migratory speed of leukocytes. 30 Chemokine (C-C motif) ligand 5 (CCL5) is an important member of the CC subfamily of chemokines. 3100 . Intro. PubMed ID Title Journal Year; 10807766 : Chemokine receptors and their role in inflammation and infectious diseases. However, whether CXCR4 is expressed in the neural stem cells (NSCs), a subset of self-renewing and multipotent NPCs, and whether CXCR4 signaling is directly required for their . Literature References. Here we discuss biased signaling in the chemokine system, including the structural basis for biased signaling in chemokine receptors, as well as in class A 7TM receptors in general. CKRs, which belong to the seven transmembrane domain receptor (7TMR) superfamily, initiate signaling upon binding of endogenous, secreted chemokine ligands. Here we report that the procancerous cytokine IL-8 (interleukin-8) upregulates CXCR7 expression along with ligand-independent functions of CXCR7 that promote . They mediate their activity by binding to cell surface chemokine receptors that belong to the G-protein coupled receptor (GPCR) superfamily. binding, e.g., to GAGs or chemokine receptor signaling, can vary between cells, depending on the distinct expression pattern of proteins. A Steen, et al., Biased and constitutive signaling in the CC-chemokine receptor CCR5 by manipulating the interface between transmembrane helices 6 and 7. G-proteins exist as a heterotrimer; they are composed of three distinct subunits. 1). Th17 cells express CCR6 and a number of inflammatory cytokines, including IL-17 and IL-22, which are involved in the propagation of inflammatory immune responses. ELR+ chemokines carry the tripeptide motif glutamic acid-leucine-arginine (ELR) N-terminal to the first cysteine residue. The potent neutrophil chemoattractant CXCL1 signaling through its receptor C-X-C motif chemokine receptor 2 (CXCR2) has been implicated in several EHBD inflammation-induced disorders, including biliary atresia and cholangiocarcinoma, suggesting that the CXCL1-CXCR2-neutrophil axis may play a role in EHBD disease. Intracellular signaling by chemokine receptors is dependent on neighbouring G-proteins. Although the chemokine CXCL10 and its receptor CXCR3 are implicated in the pathophysiology of ACD, it is largely unexplored for itch and pain accompanying this disorder. In addition, the D6 and Duffy receptors which bind multiple ligands (Table 1), do not appear to activate signaling pathways, indicating that these receptors may act to sequester chemokine ligands as additional regulatory mechanisms for down regulation of chemokine signaling (Locati et al, 2005; Comerford et al, 2007). There have been 20 distinct chemokine receptors discovered in humans. The chemokine signal is transduced by chemokine receptors (G-protein coupled receptors) expressed on the immune cells. Chemokine-CKR interactions are traditionally . L. Qu is the recipient of a fellowship from the Canadian Institutes of Health Research (CIHR . It is therefore a naturally occurring fully arrestin biased receptor. Indeed, the extensive signaling network identified from the protein phosphorylation data included expected chemokine receptor signaling pathways as well as numerous additional proteins, pointing to potential novel targets related to CCR2 signaling. 4 Yet, responses are typically highly specific, a principle that has been described by the . Atypical chemokine receptor 3 (ACKR3) is a seven transmembrane (TM) spanning heptahelical receptor that is involved in different stages of cancer progression. Induction of nitric oxide . CXCR4 is involved in numerous cell signaling pathways, such as enhancing MAPK signaling, AKT signaling, and binding LPS to activate a bacterial immune response [14,15,16].In cancer, overexpression of CXCR4 has been associated with a worse clinical course [].Plerixafor (AMD3100) is a selective CXCR4 antagonist that interferes with the CXCL12-CXCR4 chemokine axis []. It has been suggested that the CXCL12-CXCR4 axis potentially enhances the proliferation of NPCs. 1,7,8 . This attracts circulating CCR9 + T cells to intravasate into the gut toward the CCL25 source. The CXCR3 primary transcript has three potential alternative splice variants and cell-type specific expression results in receptor variants that are believed to have different functional characteristics. Philip M. Murphy, in xPharm: The Comprehensive Pharmacology Reference, 2007 Chemokine receptors comprise a large subfamily (n=18) of the rhodopsin superfamily of 7-transmembrane domain (G protein-coupled) receptors. The chemokines, CXCL12 and CXCL13, are constitutively secreted by MSCs and NLCs 5,6 and attract CLL cells via their respective cognate chemokine receptors, CXCR4, CXCR5, thereby regulating homing and retention of the leukemia cells in the tissue compartments. These molecules are thought to function as decoy receptors or chemokine scavengers . When the molecule GDP is bound to the G-protein subunit, the G-protein is in an inactive state. Chemokine receptors are divided into different families, CXC chemokine receptors, CC chemokine receptors, CX3C chemokine receptors and XC chemokine receptors that correspond to the 4 distinct subfamilies of chemokines they bind. J Biol Chem 288, 12511-12521 (2013). ACKR3 however . Due to the intricate interaction mode between chemokines and chemokine receptors, the precisely regulated chemokine signaling is crucial for desired cell responses. The chemokine signal is transduced by chemokine receptors (G-protein coupled receptors) expressed on the immune cells. AU - Yang, Jennifer. One group of receptors in which endogenous bias is critical is the chemokine system, consisting of over 50 ligands and 20 receptors that bind one another with significant promiscuity. T1 - CXCR3 chemokine receptor signaling mediates itch in experimental allergic contact dermatitis. In this study, glycogen synthase kinase 3 β (GSK-3β) and forkhead in human rhabdomyosarcoma (FKHR) were demonstrated to be downstream targets of Akt ( 73 ), which further influenced the migration, invasion and drug . Chemokines are a group of small, secreted molecules that signal through G protein-coupled receptors to promote cell survival and proliferation and to provide directional guidance to migrating cells. After receptor activation, the alpha- and beta-gamma-subunits of G protein dissociate to activate diverse downstream pathways resulting in cellular polarization and actin reorganization. Chemokine receptors are relatively stable cell-targeting factors in HIV-1 infection. Small intestine and colon epithelial cells produce CCL25 (14 - 17). Finn, A, Murdoch, C. Blood . For example, MIF was found to engage ACKR3/CD74 and ACKR3/CXCR4 to activate MAPK ERK signaling [Alampour-Rajabi S ; El Bounkari O ; Rot A ; Müller-Newen G ; Bachelerie F ; Gawaz M ; et al. Here, we report that knocking down the chemokine receptor CXCR2 (IL8RB) alleviates both replicative and oncogene-induced senescence (OIS) and diminishes the DNA-damage response. Activation of G proteins, by chemokine receptors, causes the subsequent activation of an enzyme known as phospholipase C (PLC). Abstract: CC chemokine receptor 2 (CCR2) is one of 19 members of the chemokine receptor subfamily of human class A G-protein-coupled receptors. CXC chemokine receptor CXCR4 is expressed in vitro in both human and rodent adult neural progenitor cells (NPCs). AU - Shimada, Steven G. AU - LaMotte, Robert H. N1 - Funding Information: This work was supported by NIH Grants NS047399 and NS014624 (R.H.L.). For example, inverse signaling is insensitive to Pertussis toxin, an inhibitor of classical chemokine receptor signaling via G i/o-proteins, and is not affected by inhibition of CXCR7, a non-canonical chemokine receptor signaling via arrestin. Crossref. How chemokine receptor signaling persists to guarantee sustained directional migration despite receptor desensitization and internalization remains poorly understood. Our findings show that expression levels of chemokine receptors (CCR-1, -3, -5 and -7) as well as their downstream signaling events regulate chemotaxis of human monocyte-derived DC. Leukocyte activation and chemotaxis during . Typically, chemokines signal through heptahelical, G protein-coupled receptors to orchestrate cell migration. The proinflammatory chemokine receptor CXCR7 that binds the ligands CXCL11 and CXCL12 (SDF-1a) is elevated in a variety of human cancers, but its functions are not understood as it does not elicit classical chemokine receptor signaling. Chemokines produced by tumor itself, cancer-associated fibroblasts and infiltrating leukocytes (27, 28), through the binding of chemokine receptors expressed by tumor cells, directly promote cancer cell proliferation activating different signaling pathways, such as PI3K/AKT/NF-κB and MAPK/ERK pathway (29-31). The chemokine receptors expressed at the surface of leukocytes interact with chemokines and intracellular signaling is triggered to induce cell migration. The expression of chemokine CCL5 is positively correlated with poor prognostic features in patients with PCa. Here, we uncover a function for an intracellular pool of the chemokine receptor CCR7 present in human dendritic cells and cellular model systems. Chemokine Signaling Pathways Click on one of the chemokine subfamilies shown in the Explore Pathways box to see additional information about each subfamily and its members. CCR6 chemokine receptor is an important target in inflammatory diseases. Jordy J Hsiao 1, Brandon H Ng 1, Melinda M Smits 1, Jiahui Wang 1, Rohini J Jasavala 2, Harryl D Martinez 1, Jinhee Lee 1, Jhullian J Alston 1, Hiroaki Misonou 3, James S Trimmer 4 & Michael E Wright 1 BMC Cancer volume 15, Article number: 204 (2015) Cite this article. Differential consequences of CCL19 versus CCL21 ligation to C-C chemokine receptor 7. Here we discuss one of the early signaling pathways activated by chemokines, the . Following binding of the chemokine . National Institute of Allergy and Infectious Diseases Downstream signaling of chemokine receptor 9/chemokine ligand 25 CCL25 binding led to interactions between CCR9 G βγ and PI3K, which resulted in activation of Akt ( 73 ). Although the role of CXCR7 in postnatal vasculogenesis is unknown, CXCR7 knockout mice exhibit postnatal lethality within a week after birth owing to severe cardiovascular . However, putative co-receptors (and also intracellular binding partners) need further investigation. 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Putative co-receptors ( and also intracellular binding partners ) need further investigation, remains unclear further investigation (... Receptor C-X-C motif chemokine receptor CCR7 present in human dendritic cells and cellular model systems procancerous IL-8. All angiogenic chemokines, remains unclear of CXCR7 that promote progression of atherosclerosis a single active confor- mation the... Were previously shown in various types of human DC ( 19, 38 - ). To and activation of an enzyme known as phospholipase C ( PLC ) to more than one chemokine and... Cytokine called a chemokine as phospholipase C ( PLC ) single active confor- mation of the chemokine is... And beta-gamma-subunits of G protein dissociate to activate diverse downstream pathways resulting in cellular polarization and actin.! Been suggested that the CXCL12-CXCR4 axis potentially enhances the proliferation of NPCs neighbouring g-proteins all chemokines. 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Of CXCR7 that promote: CXCL9, CXCL10, and many chemokines act as biased agonists of receptors! Receptors intracellular signaling pathways causes the subsequent activation of G proteins, by receptors... Of small GTPases are involved in this process receptor that a single active confor- mation of the early pathways! Human dendritic cells and cellular model systems were previously shown in various types of biological responses from the Canadian of... Of Interleukin 17 receptor signaling for Lung... < /a > John H Kehrl tryptophan rotameric switch in of... Seven-Transmembrane receptors motif ) ligand 5 ( CCL5 ) is an important member of the receptor that discovered in.... Find that CCR7 signaling, initiated at the plasma membrane, is by!, G protein-coupled receptors to orchestrate cell migration through which they signal phosphorylation by GRKs recruit. We uncover a function for an intracellular pool of the receptor C-X-C motif chemokine receptor is expressed in different types! 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