Mechanism of DATS Inhibiting Side Population Cell Proliferation in Multiple Myeloma

OBJECTIVE: To study the effect of diallyl thiosulfinate (DATS) on the proliferation of side population (SP) cells in multiple myeloma (MM) and its mechanism. METHODS: RPMI-8226 and NCI-H929 cells were cultured, and the level of SP cells was detected by Hoechst33342 staining. The SP cells were cultured and treated with 10 µg/ml DATS, the CCK8 assay was carried out to examine the effect of DATS on the proliferation ability in SP cells, and plate colony-forming test was used to examine the colony-forming ability, the flow cytometry assay was carried out to examine the cell cycle, Western blot assay was used to examine the expression of cyclin D1, cyclin E, CDK2 and CDK4. RESULTS: SP cells were detected in RPMI-8226 and NCI-H929 cells with a proportion of 3.17±0.98 and 2.65±0.61, respectively. DATS treatment could significantly inhibit the SP cells survival in a time-dependent manner, and also could significantly inhibit the colony forming. In addition, DATS treatment could significantly induce the G1/S arrest and suppress the expression of cyclin D1, cyclin E, CDK2 and CDK4. CONCLUSION: DATS can inhibit the proliferation and colony-forming of SP cells in multiple myeloma, and induce the G1/S arrest that may be carried out via suppressing the expression of cyclin D1, cyclin E, CDK2 and CDK4.