CXCL4

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Ligands
CXCL4 (Human)

GtoPdb Ligand ID: 3685

Synonyms: platelet factor 4 (PF4)

Compound class: Endogenous peptide in human, mouse or rat

Comment: CXCL4 is a C-X-C motif chemokine first identified in megakaryocytes and platelets. It is a potent antiangiogenic chemokine and also promotes inflammatory fibrosis [3]. It can be used as a prognostic marker for the fibrosing autoimmune disease systemic sclerosis (scleroderma) [2]. A CXCR3 splice variant, CXCR3B, is a functional receptor for CXCL4 [1].

Species: Human

Summary
Biological activity
References
Structure
Immunopharmacology

Bioactivity Comments
CXCL4 appears to be the predominant ligand for CXCR3B, in comparison to the CXCR3 ligands CXCL9, -10 and -11. CXCL4 displaces binding of ¹²⁵I-CXCL10 to CXCR3B with an IC₅₀ of 7.46 nM, and displaces ¹²⁵I-CXCL4 binding with an IC₅₀ of 1.85 nM [1].

Bioactivity Comments

CXCL4 appears to be the predominant ligand for CXCR3B, in comparison to the CXCR3 ligands CXCL9, -10 and -11. CXCL4 displaces binding of ¹²⁵I-CXCL10 to CXCR3B with an IC₅₀ of 7.46 nM, and displaces ¹²⁵I-CXCL4 binding with an IC₅₀ of 1.85 nM [1].