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Author Spotlight: Exploring Salidroside's Molecular Mechanisms in Breast Cancer Treatment
Published on: June 9, 2023
Synthetic analogs of vitamin D3 have inhibitory effects on breast cancer cell lines
L Fioravanti1, P Miodini, V Cappelletti
1Oncologia Sperimentale C, Istituto Nazionale per lo Studio e la Cura dei Tumori, Milan, Italy.
Background:
1,25-dihydroxycholecalciferol has been previously reported to negatively regulate human breast cancer cell growth.
Material And Methods:
The antiproliferative effect of 1,25-dihydroxycholecalciferol (Ro 21-5535) and of the two non hypercalcemic analogs (1a,25-dihydroxy-16-ene-23-yne-26,27-hexafluorocholecalciferol+ ++, Ro 24-5531 and 1a,25-dihydroxy-16-ene-23-yne-26,27-hexafluoro-19-nor-cholec alciferol, Ro 25-6760) was studied in MCF-7 and MDAMB-468 human breast cancer cell lines. Cell cycle distribution and apoptosis were evaluated by flow cytometry. Steroid receptor modulation was investigated by radioligand assay.
Results:
The most effective drug was the Ro 25-6760 which at concentrations ranging between 1-100 nM caused a dose dependent growth inhibition apparently due to accumulation in G0/G1. Vitamin D3 analogs (10 nM) significantly counteracted the growth stimulation induced by TGF-a and IGF-I as well as the paracrine stimulation observed in co-cultures. They antagonized estradiol-promoted growth stimulation and progestrone receptor induction in MCF-7 cells.
Conclusion:
Vitamin D3 analogs represent a class of clinically attractive drugs for treatment of breast cancer due to their ability to counteract estradiol and growth factor-induced growth stimulation.
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