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Cell Cycle Modulation of MCF-7 and MDA-MB-231 by a Sub-Fraction of Strobilanthes crispus and its Combination with Tamoxifen
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 Title & Authors
Cell Cycle Modulation of MCF-7 and MDA-MB-231 by a Sub-Fraction of Strobilanthes crispus and its Combination with Tamoxifen
Yaacob, Nik Soriani; Kamal, Nik Nursyazni Nik Mohamed; Wong, Kah Keng; Norazmi, Mohd Nor;
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 Abstract
Background: Cell cycle regulatory proteins are suitable targets for cancer therapeutic development since genetic alterations in many cancers also affect the functions of these molecules. Strobilanthes crispus (S. crispus) is traditionally known for its potential benefits in treating various ailments. We recently reported that an active sub-fraction of S. crispus leaves (SCS) caused caspase-dependent apoptosis of human breast cancer MCF-7 and MDA-MB-231 cells. Materials and Methods: Considering the ability of SCS to also promote the activity of the antiestrogen, tamoxifen, we further examined the effect of SCS in modulating cell cycle progression and related proteins in MCF-7 and MDA-MB-231 cells alone and in combination with tamoxifen. Expression of cell cycle-related transcripts was analysed based on a previous microarray dataset. Results: SCS significantly caused G1 arrest of both types of cells, similar to tamoxifen and this was associated with modulation of cyclin D1, p21 and p53. In combination with tamoxifen, the anticancer effects involved downregulation of protein in MCF-7 cells but appeared independent of an ER-mediated mechanism in MDA-MB-231 cells. Microarray data analysis confirmed the clinical relevance of the proteins studied. Conclusions: The current data suggest that SCS growth inhibitory effects are similar to that of the antiestrogen, tamoxifen, further supporting the previously demonstrated cytotoxic and apoptotic actions of both agents.
 Keywords
Strobilanthes crispus;tamoxifen;cell cycle;estrogen receptor;MCF-7;MDA-MB-231;
 Language
English
 Cited by
1.
Towards the mode of action of Strobilanthes crispus through integrated computational and experimental analyses, Journal of Plant Biochemistry and Biotechnology, 2017, 26, 4, 451  crossref(new windwow)
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