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Bovilla VR, Kuruburu MG, Bettada VG, Krishnamurthy J, Sukocheva OA, Thimmulappa RK, Shivananju NS, Balakrishna JP, Madhunapantula SV. Targeted Inhibition of Anti-Inflammatory Regulator Nrf2 Results in Breast Cancer Retardation In Vitro and In Vivo. Biomedicines 2021; 9:1119. [PMID: 34572304 PMCID: PMC8471069 DOI: 10.3390/biomedicines9091119] [Citation(s) in RCA: 25] [Impact Index Per Article: 8.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/29/2021] [Revised: 08/21/2021] [Accepted: 08/26/2021] [Indexed: 02/06/2023] Open
Abstract
Nuclear factor erythroid-2 related factor-2 (Nrf2) is an oxidative stress-response transcriptional activator that promotes carcinogenesis through metabolic reprogramming, tumor promoting inflammation, and therapeutic resistance. However, the extension of Nrf2 expression and its involvement in regulation of breast cancer (BC) responses to chemotherapy remain largely unclear. This study determined the expression of Nrf2 in BC tissues (n = 46) and cell lines (MDA-MB-453, MCF-7, MDA-MB-231, MDA-MB-468) with diverse phenotypes. Immunohistochemical (IHC)analysis indicated lower Nrf2 expression in normal breast tissues, compared to BC samples, although the difference was not found to be significant. However, pharmacological inhibition and siRNA-induced downregulation of Nrf2 were marked by decreased activity of NADPH quinone oxidoreductase 1 (NQO1), a direct target of Nrf2. Silenced or inhibited Nrf2 signaling resulted in reduced BC proliferation and migration, cell cycle arrest, activation of apoptosis, and sensitization of BC cells to cisplatin in vitro. Ehrlich Ascites Carcinoma (EAC) cells demonstrated elevated levels of Nrf2 and were further tested in experimental mouse models in vivo. Intraperitoneal administration of pharmacological Nrf2 inhibitor brusatol slowed tumor cell growth. Brusatol increased lymphocyte trafficking towards engrafted tumor tissue in vivo, suggesting activation of anti-cancer effects in tumor microenvironment. Further large-scale BC testing is needed to confirm Nrf2 marker and therapeutic capacities for chemo sensitization in drug resistant and advanced tumors.
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Affiliation(s)
- Venugopal R. Bovilla
- Department of Biochemistry (DST-FIST Supported Department), JSS Medical College, JSS Academy of Higher Education & Research, Mysore 570015, Karnataka, India; (V.R.B.); (M.G.K.); (V.G.B.); (R.K.T.)
- Center of Excellence in Molecular Biology and Regenerative Medicine (CEMR) Laboratory (DST-FIST Supported Center), JSS Medical College, JSS Academy of Higher Education & Research, Mysore 570015, Karnataka, India
- Public Health Research Institute of India (PHRII), Mysuru 570020, Karnataka, India
| | - Mahadevaswamy G. Kuruburu
- Department of Biochemistry (DST-FIST Supported Department), JSS Medical College, JSS Academy of Higher Education & Research, Mysore 570015, Karnataka, India; (V.R.B.); (M.G.K.); (V.G.B.); (R.K.T.)
- Center of Excellence in Molecular Biology and Regenerative Medicine (CEMR) Laboratory (DST-FIST Supported Center), JSS Medical College, JSS Academy of Higher Education & Research, Mysore 570015, Karnataka, India
| | - Vidya G. Bettada
- Department of Biochemistry (DST-FIST Supported Department), JSS Medical College, JSS Academy of Higher Education & Research, Mysore 570015, Karnataka, India; (V.R.B.); (M.G.K.); (V.G.B.); (R.K.T.)
- Center of Excellence in Molecular Biology and Regenerative Medicine (CEMR) Laboratory (DST-FIST Supported Center), JSS Medical College, JSS Academy of Higher Education & Research, Mysore 570015, Karnataka, India
| | - Jayashree Krishnamurthy
- Department of Pathology, JSS Medical College, JSS Academy of Higher Education & Research, Mysore 570015, Karnataka, India;
| | - Olga A. Sukocheva
- College of Nursing and Health Sciences, Flinders University, Bedford Park, SA 5042, Australia
| | - Rajesh K. Thimmulappa
- Department of Biochemistry (DST-FIST Supported Department), JSS Medical College, JSS Academy of Higher Education & Research, Mysore 570015, Karnataka, India; (V.R.B.); (M.G.K.); (V.G.B.); (R.K.T.)
- Center of Excellence in Molecular Biology and Regenerative Medicine (CEMR) Laboratory (DST-FIST Supported Center), JSS Medical College, JSS Academy of Higher Education & Research, Mysore 570015, Karnataka, India
| | - Nanjunda Swamy Shivananju
- Department of Biotechnology, JSS Technical Institutions Campus, JSS Science and Technology University, Mysore 570006, Karnataka, India;
| | | | - SubbaRao V. Madhunapantula
- Department of Biochemistry (DST-FIST Supported Department), JSS Medical College, JSS Academy of Higher Education & Research, Mysore 570015, Karnataka, India; (V.R.B.); (M.G.K.); (V.G.B.); (R.K.T.)
- Center of Excellence in Molecular Biology and Regenerative Medicine (CEMR) Laboratory (DST-FIST Supported Center), JSS Medical College, JSS Academy of Higher Education & Research, Mysore 570015, Karnataka, India
- Leader, Special Interest Group in Cancer Biology and Cancer Stem Cells (SIG-CBCSC), JSS Academy of Higher Education & Research, Mysore 570015, Karnataka, India
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