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

Öz

Sfingolipidler hücre büyümesi ve çoğalmasını kontrol ederek hücrenin yaşam veya ölüm arasındaki kararını belirlemektedir. Büyümeyi baskılayıcı etkisi olan de novo yol izi veya salvage yol izi ile sentezlenen seramid sfingozin kinaz (SK) ve glukosil seramid sentaz (GSS) enzimleri tarafından sırasıyla hücre çoğalmasını destekleyici sfingozin-1-fosfat (S1F) ve glukozil seramide (GS) dönüştürülmektedir. Bu çalışmada, resveratrolün FLT3’yi aşırı ifade eden THP-1 ve OCI-AML3 hücreleri üzerindeki terapötik potansiyeli seramid metabolizmasının farmakolojik olarak hedeflenmesi ile araştırılmıştır. Resveratrol, SK inhibitörü (SKI II), GSS inhibitörü (PDMP) ve resveratrolün inhibitörler ile kombinasyonlarının THP-1 ve OCI-AML3 hücreleri üzerindeki sitotoksik etkileri konsantrasyona ve zamana bağlı olarak MTT hücre canlılık testi ile saptanmıştır. Resveratrolün apoptotik etkisi aneksin-V/PI ikili boyaması yapılarak akım sitometresi ile belirlenmiştir. Resveratrol her iki hücrede hücre canlılığını azaltmış ve apoptozu indüklemiştir (p<0.05 anlamlı olarak değerlendirilmiştir). Resveratolün SK ve GSS inhibitörleri ile kombinasyonlarının 48 saatlik muamele sonucu sinerjistik sitotoksik etki gösterdiği belirlenmiştir (p<0.05). Elde edilen bu sonuçlar, resveratrolün FLT3’yi aşırı ifade eden AML’de seramid metabolizmasını hedefleyerek etki gösterebileceğini literatürde ilk defa göstermiştir ve çalışma mekanistik olarak araştırılabilecektir.

Anahtar Kelimeler

• FLT3 akut miyeloid lösemi
• resveratrol
• sfingozin kinaz
• glukosil seramid sentaz

Proje Numarası

FAB-2016-66

Cytotoxic Effects of Resveratrol and Its Combinations with Ceramide Metabolism Inhibitors on FLT3 Positive Acute Myeloid Leukemia

Öz

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 concentration-dependent 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.

Anahtar Kelimeler

• FLT3 acute myeloid leukemia
• resveratrol
• sphingosine kinase
• glucosyl ceramide synthase

Destekleyen Kurum

Abdullah Gul University Scientific Reserach Projects Coordination Unit

Proje Numarası

FAB-2016-66

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