CCR5 (C-C motif chemokine receptor 5) is a G protein-coupled receptor that serves as a critical co-receptor for HIV-1 entry into cells, alongside CD4 as the primary receptor 1. The receptor binds C-C chemokines, particularly CCL5, and mediates inflammatory cell recruitment and immune responses 2. CCR5 plays significant roles in various disease processes through macrophage-mediated pathways. In pulmonary arterial hypertension, CCR5 collaborates with CCR2 to facilitate macrophage-smooth muscle cell interactions that promote vascular remodeling 3. The receptor contributes to cancer progression in colorectal cancer, where high CCR5/CCL5 expression correlates with immunosuppressive cell infiltration and poor prognosis 4. CCR5 also mediates neuropathic pain, as demonstrated in paclitaxel-induced peripheral neuropathy where elevated CCL5 induces CCR5 overexpression in dorsal root ganglia 5. A naturally occurring 32-base pair deletion variant (CCR5-Δ32) provides protection against HIV infection in homozygous individuals by preventing surface receptor expression 6. This variant is absent in Nigerian and Zimbabwean populations, potentially affecting their HIV susceptibility 7. CCR5 represents a promising therapeutic target, with antagonists showing efficacy in multiple conditions including HIV infection and inflammatory diseases 1.