CXCR3

Function

Isoform 1

Receptor for the C-X-C chemokine CXCL9, CXCL10 and CXCL11 and mediates the proliferation, survival and angiogenic activity of human mesangial cells (HMC) through a heterotrimeric G-protein signaling pathway (PubMed:12782716). Binds to CCL21. Probably promotes cell chemotaxis response. Upon activation by PF4, induces activated T-lymphocytes migration mediated via downstream Ras/extracellular signal-regulated kinase (ERK) signaling.

Isoform 2

Receptor for the C-X-C chemokine CXCL4 and also mediates the inhibitory activities of CXCL9, CXCL10 and CXCL11 on the proliferation, survival and angiogenic activity of human microvascular endothelial cells (HMVEC) through a cAMP-mediated signaling pathway (PubMed:12782716). Does not promote cell chemotaxis respons. Interaction with CXCL4 or CXCL10 leads to activation of the p38MAPK pathway and contributes to inhibition of angiogenesis. Overexpression in renal cancer cells down-regulates expression of the anti-apoptotic protein HMOX1 and promotes apoptosis.

Isoform 3

Mediates the activity of CXCL11.

Post-translational modifications

Sulfation on Tyr-27 and Tyr-29 is essential for CXCL10 binding and subsequent signal transduction induction.

N-glycosylated.

Sequence Similarities

Belongs to the G-protein coupled receptor 1 family.

Tissue Specificity

Isoform 1 and isoform 2 are mainly expressed in heart, kidney, liver and skeletal muscle. Isoform 1 is also expressed in placenta. Isoform 2 is expressed in endothelial cells. Expressed in T-cells (at protein level).

Cellular localization

• Isoform 1
• Cell membrane
• Multi-pass membrane protein
• Isoform 2
• Cell membrane
• Multi-pass membrane protein

Alternative names

CD183, GPR9, CXCR3, C-X-C chemokine receptor type 3, CXC-R3, CXCR-3, CKR-L2, G protein-coupled receptor 9, Interferon-inducible protein 10 receptor, IP-10 receptor

Database links

swissprot:P49682 entrezGene:2833 omim:300574

Other research areas

• Immuno-oncology