Effect and mechanism of Sitravatinib combined with Niraparib on proliferation, apoptosis and autophagy in mucosal melanoma cell lines

Objective To investigate the effect of anti-angiogenic drug Sitravatinib combined with poly(adenosine diphosphate[ADP]-ribose) polymerase inhibitor(PARPi) Niraparib on mucosal melanoma cell lines and its possible mechanism. Methods The CCK8 assay was used to detect the maximal half inhibitory concentration (IC50) of Sitravatinib and Niraparib targeting at mucosal melanoma (MM) cell lines. CompuSyn was used to detect the Combination Index (CI) in different concentrations of the two drugs. Flow cytometry was used to detect the effect of drugs on cell apoptosis. Colony formation assay was used to detect the effect of drugs on cell proliferation. Western blot was used to detect the protein expressions and RT-qPCR was used to detect mRNA expression. Results CI values was respectively 0.19 and 0.15 for Sitravatinib (2 μmol/L) in combination with Niraparib (20 μmol/L) in a human vaginal maligant melanoma cell line (HMVII) and a metastasis inguinal lymph node of vulvar malignant melanoma cell line (GAK). Compared wit