Resveratrol ve Seramid Metabolizması Enzim İnhibitörleri İle Kombinasyonlarının FLT3 Pozitif Akut Miyeloid Lösemideki Sitotoksik Etkileri

Abstract

Sphingolipids determine the cell fate by regulating cell proliferation and growth. Ceramide, growth inhibitory lipid, might be produced through de novo pathway or salvage pathway, which is converted to proliferation inducers sphingosine-1-phosphate (S1P) and glucosyl ceramide (GC) by sphingosine kinase (SK) and glucosyl ceramide synthase (GCS), respectively. It is aimed to investigate therapeutic potential of resveratrol on FLT3 overexpressing acute myeloid leukemia (AML) cells by pharmacological targeting of ceramide metabolism. The cytotoxic effects of resveratrol, SK inhibitor (SKI II), GCS inhibitor (PDMP) and the combinations of resveratrol with SK-1 inhibitor and GCS inhibitor on THP-1 and OCI-AML3 FLT3 overexpressing AML cells were investigated by MTT cell viability assay in a time-and concentrationdependent manner. Apoptotic effect of resveratrol was analyzed by annexin V/PI double staining using flow cytometry. Resveratrol decreased cell viability and induced apoptosis in both cell lines (p<0.05 considered significant). There were synergistic cytotoxic effects of resveratrol with co-administration of SK-1 inhibitor and GCS inhibitor at 48 h (p<0.05 considered significant). This preliminary data showed for the first time that resveratrol might inhibit the viability of FLT3 overexpressing AML cells through targeting ceramide metabolism and inducing apoptosis, which needs to be further clarified mechanistically.