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Badmus JA, Ekpo OE, Sharma JR, Sibuyi NRS, Meyer M, Hussein AA, Hiss DC. An Insight into the Mechanism of Holamine- and Funtumine-Induced Cell Death in Cancer Cells. Molecules 2020; 25:molecules25235716. [PMID: 33287388 PMCID: PMC7730674 DOI: 10.3390/molecules25235716] [Citation(s) in RCA: 5] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/14/2020] [Revised: 10/11/2020] [Accepted: 10/16/2020] [Indexed: 12/12/2022] Open
Abstract
Holamine and funtumine, steroidal alkaloids with strong and diverse pharmacological activities are commonly found in the Apocynaceae family of Holarrhena. The selective anti-proliferative and cell cycle arrest effects of holamine and funtumine on cancer cells have been previously reported. The present study evaluated the anti-proliferative mechanism of action of these two steroidal alkaloids on cancer cell lines (HT-29, MCF-7 and HeLa) by exploring the mitochondrial depolarization effects, reactive oxygen species (ROS) induction, apoptosis, F-actin perturbation, and inhibition of topoisomerase-I. The apoptosis-inducing effects of the compounds were studied by flow cytometry using the APOPercentageTM dye and Caspase-3/7 Glo assay kit. The two compounds showed a significantly greater cytotoxicity in cancer cells compared to non-cancer (normal) fibroblasts. The observed antiproliferative effects of the two alkaloids presumably are facilitated through the stimulation of apoptosis. The apoptotic effect was elicited through the modulation of mitochondrial function, elevated ROS production, and caspase-3/7 activation. Both compounds also induced F-actin disorganization and inhibited topoisomerase-I activity. Although holamine and funtumine appear to have translational potential for the development of novel anticancer agents, further mechanistic and molecular studies are recommended to fully understand their anticancer effects.
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Affiliation(s)
- Jelili A. Badmus
- Department of Medical Biosciences, University of the Western Cape, 7535 Bellville, Western Cape, South Africa; (J.A.B.); (O.E.E.)
| | - Okobi E. Ekpo
- Department of Medical Biosciences, University of the Western Cape, 7535 Bellville, Western Cape, South Africa; (J.A.B.); (O.E.E.)
| | - Jyoti R. Sharma
- DSI/Mintek-Nanotechnology Innovation Centre-BioLabels Node, Department of Biotechnology, University of the Western Cape, 7535 Bellville, Western Cape, South Africa; (J.R.S.); (N.R.S.S.); (M.M.)
| | - Nicole Remaliah S. Sibuyi
- DSI/Mintek-Nanotechnology Innovation Centre-BioLabels Node, Department of Biotechnology, University of the Western Cape, 7535 Bellville, Western Cape, South Africa; (J.R.S.); (N.R.S.S.); (M.M.)
| | - Mervin Meyer
- DSI/Mintek-Nanotechnology Innovation Centre-BioLabels Node, Department of Biotechnology, University of the Western Cape, 7535 Bellville, Western Cape, South Africa; (J.R.S.); (N.R.S.S.); (M.M.)
| | - Ahmed A. Hussein
- Department of Chemistry, Cape Peninsula University of Technology, 7535 Bellville, Western Cape, South Africa;
| | - Donavon C. Hiss
- Department of Medical Biosciences, University of the Western Cape, 7535 Bellville, Western Cape, South Africa; (J.A.B.); (O.E.E.)
- Correspondence:
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S Sibuyi NR, Thovhogi N, Gabuza KB, Meyer MD, Drah M, Onani MO, Skepu A, Madiehe AM, Meyer M. Peptide-functionalized nanoparticles for the selective induction of apoptosis in target cells. Nanomedicine (Lond) 2017. [PMID: 28635372 DOI: 10.2217/nnm-2017-0085] [Citation(s) in RCA: 11] [Impact Index Per Article: 1.6] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/17/2022] Open
Abstract
AIM The study developed a prohibitin (PHB) targeted nanotherapy for selective induction of apoptosis in target cells. METHODS Gold nanoparticles (AuNPs) were bifunctionalized with adipose homing and proapoptotic peptides. The efficacy and mode of cell death induced by the AuNPs were investigated in vitro on three cancer cell lines. RESULTS The antiproliferative activity of PHB-targeted bifunctionalized AuNPs was more pronounced on cells that express the PHB receptor, and demonstrated receptor-mediated targeting and selectivity. The bifunctionalized AuNPs induced cell death by apoptosis. CONCLUSION The PHB-targeted nanotherapy under study could potentially be used for treatment of diseases that are characterized by overexpression of PHB. As such, further investigations will be conducted in vivo.
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Affiliation(s)
- Nicole Remaliah S Sibuyi
- DST/Mintek Nanotechnology Innovation Centre (NIC), Biolabels Unit, Department of Biotechnology, University of the Western Cape (UWC), Private Bag X17, Bellville, 7535, Western Cape, South Africa
| | - Ntevheleni Thovhogi
- DST/Mintek Nanotechnology Innovation Centre (NIC), Biolabels Unit, Department of Biotechnology, University of the Western Cape (UWC), Private Bag X17, Bellville, 7535, Western Cape, South Africa
| | - Kwazikwakhe B Gabuza
- DST/Mintek Nanotechnology Innovation Centre (NIC), Biolabels Unit, Department of Biotechnology, University of the Western Cape (UWC), Private Bag X17, Bellville, 7535, Western Cape, South Africa
| | - Miche D Meyer
- DST/Mintek Nanotechnology Innovation Centre (NIC), Biolabels Unit, Department of Biotechnology, University of the Western Cape (UWC), Private Bag X17, Bellville, 7535, Western Cape, South Africa
| | - Mustafa Drah
- DST/Mintek Nanotechnology Innovation Centre (NIC), Biolabels Unit, Department of Biotechnology, University of the Western Cape (UWC), Private Bag X17, Bellville, 7535, Western Cape, South Africa
| | - Martin O Onani
- Organometallics & Nanomaterials, Department of Chemistry, UWC, Private Bag X17, Bellville, 7535, Western Cape, South Africa
| | - Amanda Skepu
- DST/Mintek NIC, Biolabels Unit, Advanced Materials Division, Mintek, Private Bag X3015, Randburg, 2125, Gauteng, South Africa
| | - Abram M Madiehe
- DST/Mintek Nanotechnology Innovation Centre (NIC), Biolabels Unit, Department of Biotechnology, University of the Western Cape (UWC), Private Bag X17, Bellville, 7535, Western Cape, South Africa
| | - Mervin Meyer
- DST/Mintek Nanotechnology Innovation Centre (NIC), Biolabels Unit, Department of Biotechnology, University of the Western Cape (UWC), Private Bag X17, Bellville, 7535, Western Cape, South Africa
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