BACKGROUND: Bioactive marine molecules have recently received considerable attention for their nutraceutical characteristics. Considering the ever-increasing demand of nutraceuticals for anti-cancer therapy, we investigated the apoptosis-inducing effects of marine carotenoids, including siphonaxanthin, on human leukemia (HL-60) cells. METHODS: Apoptotic effects were evaluated by cell viability assay, TUNEL assay, and caspase-3 activity. The expression of apoptosis-inducing death receptor-5 (DR5), Bcl-2 and Bax were assayed by Western blot analysis, and mRNA expression of GADD45α was assayed by quantitative RT-PCR analysis. RESULTS: Siphonaxanthin potently inhibited the viability of HL-60 cells compared with the other carotenoids evaluated. In comparison with fucoxanthin, siphonaxanthin at a concentration of 20μM markedly reduced cell viability (p<0.05) as early as within 6h of treatment. The effective apoptotic activity of siphonaxanthin was observed by increases in TUNEL-positive cells, and by increased chromatin condensation in HL-60 cells. This induction of apoptosis was associated with the decreased expression of Bcl-2, and the subsequently increased activation of caspase-3. In addition, siphonaxanthin up-regulated the expression of GADD45α and DR5. CONCLUSIONS: These data suggest that the dietary carotenoid siphonaxanthin could be potentially useful as a chemo-preventive and/or chemotherapeutic agent. GENERAL SIGNIFICANCE: Our findings demonstrate for the first time the novel functional property of siphonaxanthin as a potent inducer of apoptosis in HL-60 cells.
BACKGROUND: Bioactive marine molecules have recently received considerable attention for their nutraceutical characteristics. Considering the ever-increasing demand of nutraceuticals for anti-cancer therapy, we investigated the apoptosis-inducing effects of marine carotenoids, including siphonaxanthin, on humanleukemia (HL-60) cells. METHODS: Apoptotic effects were evaluated by cell viability assay, TUNEL assay, and caspase-3 activity. The expression of apoptosis-inducing death receptor-5 (DR5), Bcl-2 and Bax were assayed by Western blot analysis, and mRNA expression of GADD45α was assayed by quantitative RT-PCR analysis. RESULTS:Siphonaxanthin potently inhibited the viability of HL-60 cells compared with the other carotenoids evaluated. In comparison with fucoxanthin, siphonaxanthin at a concentration of 20μM markedly reduced cell viability (p<0.05) as early as within 6h of treatment. The effective apoptotic activity of siphonaxanthin was observed by increases in TUNEL-positive cells, and by increased chromatin condensation in HL-60 cells. This induction of apoptosis was associated with the decreased expression of Bcl-2, and the subsequently increased activation of caspase-3. In addition, siphonaxanthin up-regulated the expression of GADD45α and DR5. CONCLUSIONS: These data suggest that the dietary carotenoidsiphonaxanthin could be potentially useful as a chemo-preventive and/or chemotherapeutic agent. GENERAL SIGNIFICANCE: Our findings demonstrate for the first time the novel functional property of siphonaxanthin as a potent inducer of apoptosis in HL-60 cells.
Authors: G Sowmya Shree; K Yogendra Prasad; H S Arpitha; U R Deepika; K Nawneet Kumar; Priya Mondal; P Ganesan Journal: Mol Cell Biochem Date: 2017-05-26 Impact factor: 3.396
Authors: Areum Daseul Kim; Youngki Lee; Sang-Hyuck Kang; Gi Young Kim; Hye Sun Kim; Jin Won Hyun Journal: Mar Drugs Date: 2013-02-06 Impact factor: 5.118