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  • Title: 1α,25(OH)2D3 Analog, MART-10, Inhibits Neuroendocrine Tumor Cell Growth Through Induction of G0/G1 Cell-cycle Arrest and Apoptosis.
    Author: Chiang KC, Yeh CN, Pang JH, Hsu JT, Yeh TS, Chen LW, Kuo SF, Hsieh PJ, Pan YC, Takano M, Chen TC, Feng TH, Kittaka A, Juang HH.
    Journal: Anticancer Res; 2016 Jul; 36(7):3307-13. PubMed ID: 27354587.
    Abstract:
    BACKGROUND: Neuroendocrine tumors (NETs) are the second most common digestive malignancy. For advanced NETs, survival is not satisfactory. Vitamin D has emerged as a promising anticancer drug. MATERIALS AND METHODS: Cell proliferation assay, western blot, flow cytometry, and terminal deoxynucleotidyl transferase dUTP nick-end labeling (TUNEL) assays were applied. RESULTS: We demonstrated that RIN-m cells, neuroendocrine tumor cells, expressed vitamin D receptor (VDR) and VDR expression increased with increasing exposure to 1α,25-dihydroxyvitamin D3 [1α,25(OH)2D3] or MART-10, a 1α,25(OH)2D3 analog. MART-10 had anti-growth effect on RIN-m cells comparable to those of 1α,25(OH)2D3 The growth inhibition of both drugs was mediated by induction of cell-cycle arrest at G0/G1 phase and apoptosis. Western blot assay further revealed that this G0/G1 arrest was due to the up-regulation of p27 and down-regulation of cyclin dependent kinase 4 (CDK4), with MART-10 also reducing CDK6. Apoptosis induction was further supported by increased cleaved caspase-3 expression after treatment. CONCLUSION: MART-10 appears to be a promising regimen for NET treatment.
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