Publications by authors named "Lope Pihie Azimahtol Hawariah"

3 Publications

  • Page 1 of 1

Antiproliferative and Proapoptotic Effects of Labisia pumila Ethanol Extract and Its Active Fraction in Human Melanoma HM3KO Cells.

Evid Based Complement Alternat Med 2012 8;2012:123470. Epub 2012 Mar 8.

School of Biosciences and Biotechnology, Faculty of Science and Technology, National University of Malaysia, 43600 Bangi, Malaysia.

The present study was to determine the anticancer potential of Labisia pumila in in vitro models. Results from the study revealed that ethanol extract of L. pumila was more cytotoxic against HM3KO cells while having reduced effects on nonmalignant cells as compared to aqueous and hexane extracts. Thus, ethanol extract was selected to be further separated by using the bioassay-guided fractionation method to give an active fraction, SF2Lp. Results obtained from the flow cytometry analysis showed that SF2Lp was able to arrest the HM3KO cell cycle at the G1 phase, while morphological findings from AO-EB nuclear staining assays along with the Apoptotic Index confirmed the induction of apoptosis by SF2Lp in HM3KO cells. Results from the mechanistic study further revealed that SF2Lp treatment was able to concurrently increase the expression level of p53 and pro-apoptotic protein Bax and also reduce the expression level of anti-apoptotic protein BCl-2 in HM3KO cells, directly contributing to the increase in Bax/Bcl-2 ratio. These findings, therefore, suggested that L. pumila was able to inhibit HM3KO cell growth possibly by arresting the cell cycle at G1 phase and inducing apoptosis in HM3KO cells via the up- and down-regulation of Bax/Bcl-2 protein, mediated through a p53-dependent pathway.
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http://dx.doi.org/10.1155/2012/123470DOI Listing
http://www.ncbi.nlm.nih.gov/pmc/articles/PMC3310196PMC
August 2012

Xanthorrhizol induced DNA fragmentation in HepG2 cells involving Bcl-2 family proteins.

Biochem Biophys Res Commun 2012 Apr 23;420(4):834-8. Epub 2012 Mar 23.

School of Biosciences & Biotechnology, Faculty of Science & Technology, Universiti Kebangsaan Malaysia, 43600 Bangi, Selangor, Malaysia.

Xanthorrhizol is a plant-derived pharmacologically active sesquiterpenoid compound isolated from Curcuma xanthorrhiza. Previously, we have reported that xanthorrhizol inhibited the proliferation of HepG2 human hepatoma cells by inducing apoptotic cell death via caspase activation. Here, we attempt to further elucidate the mode of action of xanthorrhizol. Apoptosis in xanthorrhizol-treated HepG2 cells as observed by scanning electron microscopy was accompanied by truncation of BID; reduction of both anti-apoptotic Bcl-2 and Bcl-X(L) expression; cleavage of PARP and DFF45/ICAD proteins and DNA fragmentation. Taken together, these results suggest xanthorrhizol as a potent antiproliferative agent on HepG2 cells by inducing apoptosis via Bcl-2 family members. Hence we proposed that xanthorrhizol could be used as an anti-liver cancer drug for future studies.
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http://dx.doi.org/10.1016/j.bbrc.2012.03.083DOI Listing
April 2012

F16, a fraction from Eurycoma longifolia jack extract, induces apoptosis via a caspase-9-independent manner in MCF-7 cells.

Anticancer Res 2007 Sep-Oct;27(5A):3425-30

School of Biosciences and Biotechnology, Faculty of Science and Technology, National University of Malaysia, 43600 UKM Bangi, Selangor, Malaysia.

F16 is a plant-derived pharmacologically active fraction extracted from Eurycoma longifolia Jack. Previously, we have reported that F16 inhibited the proliferation of MCF-7 human breast cancer cells by inducing apoptotic cell death while having some degree of cytoselectivity on a normal human breast cell line, MCF-10A. In this study, we attempted to further elucidate the mode of action of F16. We found that the intrinsic apoptotic pathway was invoked, with the reduction of Bcl-2 protein. Then, executioner caspase-7 was cleaved and activated in response to F16 treatment. Furthermore, apoptosis in the MCF- 7 cells was accompanied by the specific proteolytic cleavage of poly(ADP-ribose) polymerase-1 (PARP-1). Surprisingly, caspase-9 and p53 were unchanged with F16 treatment. We believe that the F16-induced apoptosis in MCF-7 cells occurs independently of caspase-9 and p53. Taken together, these results suggest that F16 from E. longifolia exerts anti-proliferative action and growth inhibition on MCF-7 cells through apoptosis induction and that it may have anticancer properties.
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November 2007