Quercetin, the active component in Bazhen Decoction that is known for anti-CRC effects, targets and inhibits CXCL8 to impede the malignant behaviors and the M2 polarization of macrophages. Thus, Quercetin may be utilized as an immunomodulatory agent in CRC treatment.
However, overexpression of CXCL8 in CRC cells did not affect the cytotoxicity of CD8+ T cells in vitro. Conclusion CXCL8-overexpressing CRC cells promoted the infiltration of M2 macrophages and inhibited CD8+ T cell infiltration to generate an immunosuppressive microenvironment in CRC.