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Tan BS, Tiong KH, Choo HL, Chung FFL, Hii LW, Tan SH, Yap IKS, Pani S, Khor NTW, Wong SF, Rosli R, Cheong SK, Leong CO. Mutant p53-R273H mediates cancer cell survival and anoikis resistance through AKT-dependent suppression of BCL2-modifying factor (BMF). Cell Death Dis 2015; 6:e1826. [PMID: 26181206 PMCID: PMC4650736 DOI: 10.1038/cddis.2015.191] [Citation(s) in RCA: 69] [Impact Index Per Article: 7.7] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/15/2015] [Revised: 05/25/2015] [Accepted: 06/09/2015] [Indexed: 12/31/2022]
Abstract
p53 is the most frequently mutated tumor-suppressor gene in human cancers. Unlike other tumor-suppressor genes, p53 mutations mainly occur as missense mutations within the DNA-binding domain, leading to the expression of full-length mutant p53 protein. Mutant p53 proteins not only lose their tumor-suppressor function, but may also gain new oncogenic functions and promote tumorigenesis. Here, we showed that silencing of endogenous p53-R273H contact mutant, but not p53-R175H conformational mutant, reduced AKT phosphorylation, induced BCL2-modifying factor (BMF) expression, sensitized BIM dissociation from BCL-XL and induced mitochondria-dependent apoptosis in cancer cells. Importantly, cancer cells harboring endogenous p53-R273H mutant were also found to be inherently resistant to anoikis and lack BMF induction following culture in suspension. Underlying these activities is the ability of p53-R273H mutant to suppress BMF expression that is dependent on constitutively active PI3K/AKT signaling. Collectively, these findings suggest that p53-R273H can specifically drive AKT signaling and suppress BMF expression, resulting in enhanced cell survivability and anoikis resistance. These findings open the possibility that blocking of PI3K/AKT will have therapeutic benefit in mutant p53-R273H expressing cancers.
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Affiliation(s)
- B S Tan
- 1] School of Postgraduate Studies, International Medical University, Bukit Jalil, Kuala Lumpur, Malaysia [2] Center for Cancer and Stem Cell Research, International Medical University, Bukit Jalil, Kuala Lumpur, Malaysia
| | - K H Tiong
- 1] School of Postgraduate Studies, International Medical University, Bukit Jalil, Kuala Lumpur, Malaysia [2] Oral Cancer Research and Co-ordinating Center (OCRCC), Faculty of Dentistry, University of Malaya, Kuala Lumpur, Malaysia [3] Cancer Research Initiatives Foundation, Sime Darby Medical Centre, Subang Jaya, Malaysia
| | - H L Choo
- 1] School of Postgraduate Studies, International Medical University, Bukit Jalil, Kuala Lumpur, Malaysia [2] Center for Cancer and Stem Cell Research, International Medical University, Bukit Jalil, Kuala Lumpur, Malaysia
| | - F Fei-Lei Chung
- Center for Cancer and Stem Cell Research, International Medical University, Bukit Jalil, Kuala Lumpur, Malaysia
| | - L-W Hii
- 1] School of Postgraduate Studies, International Medical University, Bukit Jalil, Kuala Lumpur, Malaysia [2] Center for Cancer and Stem Cell Research, International Medical University, Bukit Jalil, Kuala Lumpur, Malaysia
| | - S H Tan
- 1] School of Postgraduate Studies, International Medical University, Bukit Jalil, Kuala Lumpur, Malaysia [2] Center for Cancer and Stem Cell Research, International Medical University, Bukit Jalil, Kuala Lumpur, Malaysia
| | - I K S Yap
- School of Pharmacy, International Medical University, Bukit Jalil, Kuala Lumpur, Malaysia
| | - S Pani
- ANU Medical School, Canberra Hospital Campus, The Canberra Hospital Building 4, Garran, Australia
| | - N T W Khor
- School of Medicine, Faculty of Medical and Health Sciences, The University of Auckland, Auckland, New Zealand
| | - S F Wong
- School of Medicine, International Medical University, Bukit Jalil, Kuala Lumpur, Malaysia
| | - R Rosli
- UPM-MAKNA Cancer Research Laboratory, Institute of Bioscience, Universiti Putra Malaysia, 43400 UPM Serdang, Selangor, Malaysia
| | - S-K Cheong
- Faculty of Medicine and Health Sciences, University Tunku Abdul Rahman, Bandar Sungai Long, Selangor, Malaysia
| | - C-O Leong
- 1] School of Postgraduate Studies, International Medical University, Bukit Jalil, Kuala Lumpur, Malaysia [2] Center for Cancer and Stem Cell Research, International Medical University, Bukit Jalil, Kuala Lumpur, Malaysia [3] School of Pharmacy, International Medical University, Bukit Jalil, Kuala Lumpur, Malaysia
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