1
|
Kong Q, Yan X, Cheng M, Jiang X, Xu L, Shen L, Yu H, Sun L. p62 Promotes the Mitochondrial Localization of p53 through Its UBA Domain and Participates in Regulating the Sensitivity of Ovarian Cancer Cells to Cisplatin. Int J Mol Sci 2022; 23:ijms23063290. [PMID: 35328718 PMCID: PMC8949157 DOI: 10.3390/ijms23063290] [Citation(s) in RCA: 5] [Impact Index Per Article: 2.5] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/11/2022] [Revised: 03/05/2022] [Accepted: 03/16/2022] [Indexed: 02/06/2023] Open
Abstract
Chemotherapeutic drug-induced p53-dependent crosstalk among tumor cells affects the sensitivity of tumor cells to chemotherapeutic drugs, contributing to chemoresistance. Therefore, pharmacological targeting of p53 may contribute to overcoming drug resistance. The localization of p53 is closely related to its function. Thus, we assessed the effect of p62 on the coordination of p53 mitochondrial localization under chemotherapeutic drug treatment in ovarian cancer cells. We found that the combined use of the proteasome inhibitor epoxomicin and cisplatin led to the accumulation of p53 and sequestosome1(p62) in the mitochondria, downregulated mitochondrial DNA (mtDNA) transcription, inhibited mitochondrial functions, and ultimately promoted apoptosis by enhancing cisplatin sensitivity in ovarian cancer cells. Moreover, the ubiquitin-associated (UBA) domain of p62 was involved in regulating the mitochondrial localization of p53. Our findings suggest that the interaction between p62 and p53 may be a mechanism that determines the fate of tumor cells. In conclusion, p62 coordinated the mitochondrial localization of p53 through its UBA domain, inhibited mtDNA transcription, downregulated mitochondrial function, and promoted ovarian cancer cell death. Our study demonstrates the important role of p53 localization in tumor cell survival and apoptosis, and provides new insights into understanding the anti-tumor mechanism of targeting the ubiquitin–proteasome system in tumor cells.
Collapse
Affiliation(s)
- Qinghuan Kong
- Department of Pathophysiology, College of Basic Medical Sciences, Jilin University, Changchun 130021, China; (Q.K.); (X.Y.); (M.C.); (L.X.); (L.S.)
| | - Xiaoyu Yan
- Department of Pathophysiology, College of Basic Medical Sciences, Jilin University, Changchun 130021, China; (Q.K.); (X.Y.); (M.C.); (L.X.); (L.S.)
| | - Meiyu Cheng
- Department of Pathophysiology, College of Basic Medical Sciences, Jilin University, Changchun 130021, China; (Q.K.); (X.Y.); (M.C.); (L.X.); (L.S.)
| | - Xin Jiang
- Department of Biochemistry, College of Basic Medical Sciences, Jilin University, Changchun 130021, China;
| | - Long Xu
- Department of Pathophysiology, College of Basic Medical Sciences, Jilin University, Changchun 130021, China; (Q.K.); (X.Y.); (M.C.); (L.X.); (L.S.)
| | - Luyan Shen
- Department of Pathophysiology, College of Basic Medical Sciences, Jilin University, Changchun 130021, China; (Q.K.); (X.Y.); (M.C.); (L.X.); (L.S.)
| | - Huimei Yu
- Department of Pathophysiology, College of Basic Medical Sciences, Jilin University, Changchun 130021, China; (Q.K.); (X.Y.); (M.C.); (L.X.); (L.S.)
- Correspondence: (H.Y.); (L.S.); Tel.: +86-0-431-8561-9485 or +86-0-431-8561-9110 (H.Y. & L.S.)
| | - Liankun Sun
- Department of Pathophysiology, College of Basic Medical Sciences, Jilin University, Changchun 130021, China; (Q.K.); (X.Y.); (M.C.); (L.X.); (L.S.)
- Correspondence: (H.Y.); (L.S.); Tel.: +86-0-431-8561-9485 or +86-0-431-8561-9110 (H.Y. & L.S.)
| |
Collapse
|
2
|
Ćoćić D, Jovanović-Stević S, Jelić R, Matić S, Popović S, Djurdjević P, Baskić D, Petrović B. Homo- and hetero-dinuclear Pt(II)/Pd(II) complexes: studies of hydrolysis, nucleophilic substitution reactions, DNA/BSA interactions, DFT calculations, molecular docking and cytotoxic activity. Dalton Trans 2021; 49:14411-14431. [PMID: 33043330 DOI: 10.1039/d0dt02906h] [Citation(s) in RCA: 13] [Impact Index Per Article: 4.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/11/2022]
Abstract
Three dinuclear complexes [Pd2(tpbd)Cl2]Cl2 (PP1), [Pt2(tpbd)Cl2]Cl2 (PP2) and [PdPt(tpbd)Cl2]Cl2 (PP3) (tpbd = N,N,N',N'-tetrakis(2-pyridylmethyl)benzene-1,4-diamine) have been synthesized and characterized and the protonation constants of their corresponding diaqua analogues have been determined. Also, in water solution, the aqua analogues of these complexes exist as mono-hydroxo, di-hydroxo and dimer μ-hydroxo complexes in the pH between 3.0 and 11.0. Substitution reactions with sulfur- and nitrogen-donor nucleophiles, such as thiourea (Tu), l-methionine (l-Met), glutathione (GSH) and guanosine-5'-monophosphate (5'-GMP), were studied at pH 7.2 by conventional and stopped-flow UV-Vis spectrophotometry and the observed reactivity follows the order: Tu > l-Met > GSH > 5'-GMP. Also, the interactions with calf thymus DNA (CT-DNA) and bovine serum albumin (BSA) were investigated. Competitive studies with DNA were performed in the presence of ethidium bromide and Hoechst dye 33258 as well. The complexes possess the strong ability to react with CT-DNA exhibiting intercalation and more preferable minor groove binding. Nevertheless, all complexes showed a good binding affinity toward BSA with relatively high binding constants. The nature of the binding forces between complexes and biomolecules has been identified as hydrophobic. Experimental results were compared with the molecular docking results, while the relative stability and thermodynamic properties of dinuclear complexes were compared with their mononuclear units by DFT calculations. Among three tested complexes, PP2 showed the most powerful cytotoxic effect on HTB140 and H460 cancer cell lines after 48 h of treatment and exerted a strong long-term influence on the proliferation potential of both tested cell lines. PP2 induced the inhibition of autophagy, G2/M cell cycle arrest and mitotic catastrophe.
Collapse
Affiliation(s)
- Dušan Ćoćić
- University of Kragujevac, Faculty of Science, Radoja Domanovića 12, 34000 Kragujevac, Serbia.
| | - SneŽana Jovanović-Stević
- University of Kragujevac, Institute of Information Technologies, Jovana Cvijića bb, 34000 Kragujevac, Serbia
| | - Ratomir Jelić
- University of Kragujevac, Faculty of Medical Sciences, Department of Pharmacy, Svetozara Markovića 69, 34000 Kragujevac, Serbia
| | - Sanja Matić
- University of Kragujevac, Faculty of Medical Sciences, Department of Pharmacy, Svetozara Markovića 69, 34000 Kragujevac, Serbia
| | - Suzana Popović
- University of Kragujevac, Faculty of Medical Sciences, Centre for Molecular Medicine and Stem Cell Research, Svetozara Markovića 69, 34000 Kragujevac, Serbia
| | - Predrag Djurdjević
- University of Kragujevac, Faculty of Medical Sciences, Department of Internal medicine, Svetozara Markovića 69, 34000 Kragujevac, Serbia and Clinic for Haematology, Clinical Centre Kragujevac, Zmaj Jovina 30, 34000 Kragujevac, Serbia
| | - Dejan Baskić
- University of Kragujevac, Faculty of Medical Sciences, Centre for Molecular Medicine and Stem Cell Research, Svetozara Markovića 69, 34000 Kragujevac, Serbia and Public Health Institute, Nikole Pašića 1, 34000 Kragujevac, Serbia
| | - Biljana Petrović
- University of Kragujevac, Faculty of Science, Radoja Domanovića 12, 34000 Kragujevac, Serbia.
| |
Collapse
|
3
|
Sun Q, Ye Z, Qin Y, Fan G, Ji S, Zhuo Q, Xu W, Liu W, Hu Q, Liu M, Zhang Z, Xu X, Yu X. Oncogenic function of TRIM2 in pancreatic cancer by activating ROS-related NRF2/ITGB7/FAK axis. Oncogene 2020; 39:6572-6588. [PMID: 32929153 DOI: 10.1038/s41388-020-01452-3] [Citation(s) in RCA: 22] [Impact Index Per Article: 5.5] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/02/2020] [Revised: 07/29/2020] [Accepted: 09/02/2020] [Indexed: 02/06/2023]
Abstract
Evidence suggests that tripartite motif-containing 2 (TRIM2) is associated with carcinogenic effects in several malignancies. However, the expression patterns and roles of TRIM2 in pancreatic cancer are rarely studied. Our study demonstrated that TRIM2 was expressed in a high percentage of pancreatic tumors. High TRIM2 expression was negatively correlated with the outcome of pancreatic cancer. TRIM2 silencing significantly inhibited the proliferation, migration, invasion, and in vivo tumorigenicity of pancreatic cancer cells. Regarding the mechanism involved, TRIM2 activated ROS-related E2-related factor 2 (NRF2)/antioxidant response element (ARE) signaling and the integrin/focal adhesion kinase (FAK) pathway. Treatment of pancreatic cancer cells with the antioxidant N-acetyl-L-cysteine decreased ROS activity and expression level of NRF2 and ITGB7. Increased translocation of NRF2 protein into nucleus further rescued the inhibited ITGB7 transcription. Moreover, NRF2 bound to the potential ARE on the promoter region and enhanced the transcriptional activity of ITGB7, indicating the bridging effect of NRF2 between the two signaling pathways. In summary, our study provides evidence that upregulated TRIM2 in pancreatic cancer predicts short survival for pancreatic cancer patients. TRIM2 accelerates pancreatic cancer progression via the ROS-related NRF2/ITGB7/FAK axis.
Collapse
Affiliation(s)
- Qiqing Sun
- Department of Pancreatic Surgery, Fudan University Shanghai Cancer Center, 200032, Shanghai, China.,Department of Oncology, Shanghai Medical College, Fudan University, 200032, Shanghai, China.,Pancreatic Cancer Institute, Fudan University, 200032, Shanghai, China.,Shanghai Pancreatic Cancer Institute, 200032, Shanghai, China
| | - Zeng Ye
- Department of Pancreatic Surgery, Fudan University Shanghai Cancer Center, 200032, Shanghai, China.,Department of Oncology, Shanghai Medical College, Fudan University, 200032, Shanghai, China.,Pancreatic Cancer Institute, Fudan University, 200032, Shanghai, China.,Shanghai Pancreatic Cancer Institute, 200032, Shanghai, China
| | - Yi Qin
- Department of Pancreatic Surgery, Fudan University Shanghai Cancer Center, 200032, Shanghai, China.,Department of Oncology, Shanghai Medical College, Fudan University, 200032, Shanghai, China.,Pancreatic Cancer Institute, Fudan University, 200032, Shanghai, China.,Shanghai Pancreatic Cancer Institute, 200032, Shanghai, China
| | - Guixiong Fan
- Department of Pancreatic Surgery, Fudan University Shanghai Cancer Center, 200032, Shanghai, China.,Department of Oncology, Shanghai Medical College, Fudan University, 200032, Shanghai, China.,Pancreatic Cancer Institute, Fudan University, 200032, Shanghai, China.,Shanghai Pancreatic Cancer Institute, 200032, Shanghai, China
| | - Shunrong Ji
- Department of Pancreatic Surgery, Fudan University Shanghai Cancer Center, 200032, Shanghai, China.,Department of Oncology, Shanghai Medical College, Fudan University, 200032, Shanghai, China.,Pancreatic Cancer Institute, Fudan University, 200032, Shanghai, China.,Shanghai Pancreatic Cancer Institute, 200032, Shanghai, China
| | - Qifeng Zhuo
- Department of Pancreatic Surgery, Fudan University Shanghai Cancer Center, 200032, Shanghai, China.,Department of Oncology, Shanghai Medical College, Fudan University, 200032, Shanghai, China.,Pancreatic Cancer Institute, Fudan University, 200032, Shanghai, China.,Shanghai Pancreatic Cancer Institute, 200032, Shanghai, China
| | - Wenyan Xu
- Department of Pancreatic Surgery, Fudan University Shanghai Cancer Center, 200032, Shanghai, China.,Department of Oncology, Shanghai Medical College, Fudan University, 200032, Shanghai, China.,Pancreatic Cancer Institute, Fudan University, 200032, Shanghai, China.,Shanghai Pancreatic Cancer Institute, 200032, Shanghai, China
| | - Wensheng Liu
- Department of Pancreatic Surgery, Fudan University Shanghai Cancer Center, 200032, Shanghai, China.,Department of Oncology, Shanghai Medical College, Fudan University, 200032, Shanghai, China.,Pancreatic Cancer Institute, Fudan University, 200032, Shanghai, China.,Shanghai Pancreatic Cancer Institute, 200032, Shanghai, China
| | - Qiangsheng Hu
- Department of Pancreatic Surgery, Fudan University Shanghai Cancer Center, 200032, Shanghai, China.,Department of Oncology, Shanghai Medical College, Fudan University, 200032, Shanghai, China.,Pancreatic Cancer Institute, Fudan University, 200032, Shanghai, China.,Shanghai Pancreatic Cancer Institute, 200032, Shanghai, China
| | - Mengqi Liu
- Department of Pancreatic Surgery, Fudan University Shanghai Cancer Center, 200032, Shanghai, China.,Department of Oncology, Shanghai Medical College, Fudan University, 200032, Shanghai, China.,Pancreatic Cancer Institute, Fudan University, 200032, Shanghai, China.,Shanghai Pancreatic Cancer Institute, 200032, Shanghai, China
| | - Zheng Zhang
- Department of Pancreatic Surgery, Fudan University Shanghai Cancer Center, 200032, Shanghai, China.,Department of Oncology, Shanghai Medical College, Fudan University, 200032, Shanghai, China.,Pancreatic Cancer Institute, Fudan University, 200032, Shanghai, China.,Shanghai Pancreatic Cancer Institute, 200032, Shanghai, China
| | - Xiaowu Xu
- Department of Pancreatic Surgery, Fudan University Shanghai Cancer Center, 200032, Shanghai, China. .,Department of Oncology, Shanghai Medical College, Fudan University, 200032, Shanghai, China. .,Pancreatic Cancer Institute, Fudan University, 200032, Shanghai, China. .,Shanghai Pancreatic Cancer Institute, 200032, Shanghai, China.
| | - Xianjun Yu
- Department of Pancreatic Surgery, Fudan University Shanghai Cancer Center, 200032, Shanghai, China. .,Department of Oncology, Shanghai Medical College, Fudan University, 200032, Shanghai, China. .,Pancreatic Cancer Institute, Fudan University, 200032, Shanghai, China. .,Shanghai Pancreatic Cancer Institute, 200032, Shanghai, China.
| |
Collapse
|
4
|
Belanova AA, Smirnov DS, Makarenko MS, Belousova MM, Mashkina EV, Aleksandrova AA, Soldatov AV, Zolotukhin PV. Individual expression features of GPX2, NQO1 and SQSTM1 transcript variants induced by hydrogen peroxide treatment in HeLa cells. Genet Mol Biol 2017; 40:515-524. [PMID: 28558074 PMCID: PMC5488449 DOI: 10.1590/1678-4685-gmb-2016-0005] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/19/2016] [Accepted: 11/22/2016] [Indexed: 12/24/2022] Open
Abstract
Pathway activity assessment-based approaches are becoming highly influential in various fields of biology and medicine. However, these approaches mostly rely on analysis of mRNA expression, and total mRNA from a given locus is measured in the majority of cases. Notably, a significant portion of protein-coding genes produces more than one transcript. This biological fact is responsible for significant noise when changes in total mRNA transcription of a single gene are analyzed. The NFE2L2/AP-1 pathway is an attractive target for biomedical applications. To date, there is a lack of data regarding the agreement in expression of even classical target genes of this pathway. In the present paper we analyzed whether transcript variants of GPX2, NQO1 and SQSTM1 were characterized by individual features of expression when HeLa cells were exposed to pro-oxidative stimulation with hydrogen peroxide. We found that all the transcripts (10 in total) appeared to be significantly individually regulated under the conditions tested. We conclude that individual transcripts, rather than total mRNA, are best markers of pathway activation. We also discuss here some biological roles of individual transcript regulation.
Collapse
Affiliation(s)
- Anna A Belanova
- Evolution Corporate Group, Cell Physiology Laboratory, Southern Federal University, Rostov-on-Don, Russia
| | - Dmitry S Smirnov
- Evolution Corporate Group, Cell Physiology Laboratory, Southern Federal University, Rostov-on-Don, Russia
| | - Maxim S Makarenko
- Academy of Biology and Biotechnology, Southern Federal University, Rostov-on-Don, Russia
| | - Mariya M Belousova
- Department of English Language for Natural Sciences Faculties, Southern Federal University, Rostov-on-Don, Russia
| | - Elena V Mashkina
- Academy of Biology and Biotechnology, Southern Federal University, Rostov-on-Don, Russia
| | - Anzhela A Aleksandrova
- Academy of Biology and Biotechnology, Southern Federal University, Rostov-on-Don, Russia
| | - Alexander V Soldatov
- Department of Nanosystems Physics and Spectroscopy, Southern Federal University, Rostov-on-Don, Russia
| | - Peter V Zolotukhin
- Evolution Corporate Group, Cell Physiology Laboratory, Southern Federal University, Rostov-on-Don, Russia
| |
Collapse
|
5
|
Ma R, Li H, Zhang Y, Lin Y, Qiu X, Xie M, Yao B. The toxic effects and possible mechanisms of Brusatol on mouse oocytes. PLoS One 2017; 12:e0177844. [PMID: 28542354 PMCID: PMC5436816 DOI: 10.1371/journal.pone.0177844] [Citation(s) in RCA: 8] [Impact Index Per Article: 1.1] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/24/2016] [Accepted: 05/04/2017] [Indexed: 11/25/2022] Open
Abstract
Brusatol is a natural quassinoid that shows a potential therapeutic use in cancer models by the inhibition of Nuclear factor erythroid 2-related factor 2 (Nrf2) and is capable of inducing a variety of biological effects. The effects of Brusatol on oocyte meiosis has not been addressed. In this study, we investigated the impact of Brusatol treatment on mouse oocyte maturation and its possible mechanism. Our data demonstrated that Brusatol treatment disrupted oocyte maturation and spindle/chromosome organization by modulating Nrf2-Cyclin B1 pathway, as the influence of Brusatol was compensated by the addition of Nrf2 activation plasmid, and the mRNA and protein levels of Cyclin B1 were severely reduced in oocytes following Nrf2 decline. In summary, our data support a model that Brusatol, through the inhibition of Nrf2, modulate Cyclin B1 levels, consequently disturbing proper spindle assembly and chromosome condensation in meiotic oocytes.
Collapse
Affiliation(s)
- Rujun Ma
- Center for Reproductive Medicine, Jinling Hospital, Clinical School of Medical College, Nanjing University, Jiangsu, People's Republic of China
| | - Hongru Li
- Center for Reproductive Medicine, Jinling Hospital, Clinical School of Medical College, Nanjing University, Jiangsu, People's Republic of China
| | - Yu Zhang
- College of Animal Sciences and Technology, Nanjing Agricultural University, Jiangsu, People's Republic of China
| | - Ying Lin
- Center for Reproductive Medicine, Jinling Hospital, Clinical School of Medical College, Nanjing University, Jiangsu, People's Republic of China
- College of Life Science, Nanjing Normal University, Jiangsu, People's Republic of China
| | - Xuhua Qiu
- Center for Reproductive Medicine, Jinling Hospital, Clinical School of Medical College, Nanjing University, Jiangsu, People's Republic of China
| | - Min Xie
- Center for Reproductive Medicine, Jinling Hospital, Clinical School of Medical College, Nanjing University, Jiangsu, People's Republic of China
| | - Bing Yao
- Center for Reproductive Medicine, Jinling Hospital, Clinical School of Medical College, Nanjing University, Jiangsu, People's Republic of China
- * E-mail:
| |
Collapse
|
6
|
Lu C, Xu W, Zhang F, Shao J, Zheng S. Nrf2 Knockdown Disrupts the Protective Effect of Curcumin on Alcohol-Induced Hepatocyte Necroptosis. Mol Pharm 2016; 13:4043-4053. [PMID: 27764939 DOI: 10.1021/acs.molpharmaceut.6b00562] [Citation(s) in RCA: 70] [Impact Index Per Article: 8.8] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/14/2022]
Abstract
It has emerged that hepatocyte necroptosis plays a critical role in chronic alcoholic liver disease (ALD). Our previous study has identified that the beneficial therapeutic effect of curcumin on alcohol-caused liver injury might be attributed to activation of nuclear factor (erythroid-derived 2)-like 2 (Nrf2), whereas the role of curcumin in regulating necroptosis and the underlying mechanism remain to be determined. We first found that chronic alcohol consumption triggered obvious hepatocyte necroptosis, leading to increased expression of receptor-interacting protein 1, receptor-interacting protein 3, high-mobility group box 1, and phosphorylated mixed lineage kinase domain-like in murine livers. Curcumin dose-dependently ameliorated hepatocyte necroptosis and alleviated alcohol-caused decrease in hepatic Nrf2 expression in alcoholic mice. Then Nrf2 shRNA lentivirus was introduced to generate Nrf2-knockdown mice. Our results indicated that Nrf2 knockdown aggravated the effects of alcohol on liver injury and necroptosis and even abrogated the inhibitory effect of curcumin on necroptosis. Further, activated Nrf2 by curcumin inhibited p53 expression in both livers and cultured hepatocytes under alcohol stimulation. The next in vitro experiments, similar to in vivo ones, revealed that although Nrf2 knockdown abolished the suppression of curcumin on necroptosis of hepatocytes exposed to ethanol, p53 siRNA could clearly rescued the relative effect of curcumin. In summary, for the first time, we concluded that curcumin attenuated alcohol-induced hepatocyte necroptosis in a Nrf2/p53-dependent mechanism. These findings make curcumin an excellent candidate for ALD treatment and advance the understanding of ALD mechanisms associated with hepatocyte necroptosis.
Collapse
Affiliation(s)
- Chunfeng Lu
- Department of Pharmacology, School of Pharmacy, Nanjing University of Chinese Medicine , Nanjing, Jiangsu, China
| | - Wenxuan Xu
- Department of Pharmacology, School of Pharmacy, Nanjing University of Chinese Medicine , Nanjing, Jiangsu, China
| | - Feng Zhang
- Department of Pharmacology, School of Pharmacy, Nanjing University of Chinese Medicine , Nanjing, Jiangsu, China.,Jiangsu Key Laboratory for Pharmacology and Safety Evaluation of Chinese Materia Medica, Nanjing University of Chinese Medicine , Nanjing, Jiangsu, China
| | - Jiangjuan Shao
- Department of Pharmacology, School of Pharmacy, Nanjing University of Chinese Medicine , Nanjing, Jiangsu, China
| | - Shizhong Zheng
- Department of Pharmacology, School of Pharmacy, Nanjing University of Chinese Medicine , Nanjing, Jiangsu, China.,Jiangsu Key Laboratory for Pharmacology and Safety Evaluation of Chinese Materia Medica, Nanjing University of Chinese Medicine , Nanjing, Jiangsu, China
| |
Collapse
|
7
|
Inui T, Chano T, Takikita-Suzuki M, Nishikawa M, Yamamoto G, Okabe H. Association of p62/SQSTM1 excess and oral carcinogenesis. PLoS One 2013; 8:e74398. [PMID: 24086340 PMCID: PMC3782476 DOI: 10.1371/journal.pone.0074398] [Citation(s) in RCA: 30] [Impact Index Per Article: 2.7] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/06/2013] [Accepted: 08/01/2013] [Indexed: 12/20/2022] Open
Abstract
p62/SQSTM1 (sequestosome1) has never been evaluated in oral epithelium. In order to clarify the role of p62/SQSTM1 in carcinogenesis in oral epithelium, both p62/SQSTM1 and Nrf2 were immunohistochemically evaluated in 54 carcinomas and 14 low grade dysplasias. p62/SQSTM1 knockdowns were also designed in oral cancer cells, and we analyzed the Nrf2 pathway, GSH contents and ROS accumulation. The association between p62/SQSTM1 excess and prognosis was addressed in a clinical cohort of oral carcinoma cases. p62/SQSTM1 excess was more obvious in carcinomas, but Nrf2 was abundant in almost all samples of the oral epithelium. In oral carcinoma cells, p62/SQSTM1 knockdown did not affect the Nrf2-Keap1 pathway but did significantly reduce GSH content with subsequent ROS accumulation, and caused cell growth inhibition in the irradiated condition. Finally, p62/SQSTM1 excess was associated with poor prognosis in a clinical cohort. In oral epithelial carcinogenesis, p62/SQSTM1 excess played a role in GSH induction rather than Nrf2 accumulation, and may cause resistance to cytotoxic stresses such as radiation or chemotherapy. Immunohistochemical evaluation of p62/SQSTM1 may be a potential significant marker to identify early carcinogenesis, chemo-radiotherapeutic resistance or poor prognosis of oral squamous cell carcinomas.
Collapse
Affiliation(s)
- Takuma Inui
- Department of Clinical Laboratory Medicine, Shiga University of Medical Science, Otsu, Shiga, Japan
- Department of Oral and Maxillofacial Surgery, Shiga University of Medical Science, Otsu, Shiga, Japan
| | - Tokuhiro Chano
- Department of Clinical Laboratory Medicine, Shiga University of Medical Science, Otsu, Shiga, Japan
- * E-mail:
| | - Mikiko Takikita-Suzuki
- Department of Clinical Laboratory Medicine, Shiga University of Medical Science, Otsu, Shiga, Japan
| | - Masanori Nishikawa
- Department of Oral and Maxillofacial Surgery, Shiga University of Medical Science, Otsu, Shiga, Japan
| | - Gaku Yamamoto
- Department of Oral and Maxillofacial Surgery, Shiga University of Medical Science, Otsu, Shiga, Japan
| | - Hidetoshi Okabe
- Department of Clinical Laboratory Medicine, Shiga University of Medical Science, Otsu, Shiga, Japan
| |
Collapse
|
8
|
Siegel D, Kepa JK, Ross D. NAD(P)H:quinone oxidoreductase 1 (NQO1) localizes to the mitotic spindle in human cells. PLoS One 2012; 7:e44861. [PMID: 22984577 PMCID: PMC3439439 DOI: 10.1371/journal.pone.0044861] [Citation(s) in RCA: 35] [Impact Index Per Article: 2.9] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/12/2012] [Accepted: 08/08/2012] [Indexed: 01/18/2023] Open
Abstract
NAD(P)H:quinone oxidoreductase 1 (NQO1) is an FAD containing quinone reductase that catalyzes the 2-electron reduction of a broad range of quinones. The 2-electron reduction of quinones to hydroquinones by NQO1 is believed to be a detoxification process since this reaction bypasses the formation of the highly reactive semiquinone. NQO1 is expressed at high levels in normal epithelium, endothelium and adipocytes as well as in many human solid tumors. In addition to its function as a quinone reductase NQO1 has been shown to reduce superoxide and regulate the 20 S proteasomal degradation of proteins including p53. Biochemical studies have indicated that NQO1 is primarily located in the cytosol, however, lower levels of NQO1 have also been found in the nucleus. In these studies we demonstrate using immunocytochemistry and confocal imaging that NQO1 was found associated with mitotic spindles in cells undergoing division. The association of NQO1 with the mitotic spindles was observed in many different human cell lines including nontransformed cells (astrocytes, HUVEC) immortalized cell lines (HBMEC, 16HBE) and cancer (pancreatic adenocarcinoma, BXPC3). Confocal analysis of double-labeling experiments demonstrated co-localization of NQO1with alpha-tubulin in mitotic spindles. In studies with BxPc-3 human pancreatic cancer cells the association of NQO1 with mitotic spindles appeared to be unchanged in the presence of NQO1 inhibitors ES936 or dicoumarol suggesting that NQO1 can associate with the mitotic spindle and still retain catalytic activity. Analysis of archival human squamous lung carcinoma tissue immunostained for NQO1 demonstrated positive staining for NQO1 in the spindles of mitotic cells. The purpose of this study is to demonstrate for the first time the association of the quinone reductase NQO1 with the mitotic spindle in human cells.
Collapse
Affiliation(s)
- David Siegel
- Department of Pharmaceutical Sciences, Skaggs School of Pharmacy and Pharmaceutical Sciences, University of Colorado Anschutz Medical Campus, Aurora, Colorado, United States of America.
| | | | | |
Collapse
|
9
|
Abstract
Many studies of chemopreventive drugs have suggested that their beneficial effects on suppression of carcinogenesis and many other chronic diseases are mediated through activation of the transcription factor NFE2-related factor 2 (NRF2). More recently, genetic analyses of human tumours have indicated that NRF2 may conversely be oncogenic and cause resistance to chemotherapy. It is therefore controversial whether the activation, or alternatively the inhibition, of NRF2 is a useful strategy for the prevention or treatment of cancer. This Opinion article aims to rationalize these conflicting perspectives by critiquing the context dependence of NRF2 functions and the experimental methods behind these conflicting data.
Collapse
Affiliation(s)
- Michael B Sporn
- Department of Pharmacology, Dartmouth Medical School, Hanover, New Hampshire 03755, USA.
| | | |
Collapse
|
10
|
Nitazoxanide stimulates autophagy and inhibits mTORC1 signaling and intracellular proliferation of Mycobacterium tuberculosis. PLoS Pathog 2012; 8:e1002691. [PMID: 22589723 PMCID: PMC3349752 DOI: 10.1371/journal.ppat.1002691] [Citation(s) in RCA: 112] [Impact Index Per Article: 9.3] [Reference Citation Analysis] [Abstract] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/25/2011] [Accepted: 03/27/2012] [Indexed: 12/19/2022] Open
Abstract
Tuberculosis, caused by Mycobacterium tuberculosis infection, is a major cause of morbidity and mortality in the world today. M. tuberculosis hijacks the phagosome-lysosome trafficking pathway to escape clearance from infected macrophages. There is increasing evidence that manipulation of autophagy, a regulated catabolic trafficking pathway, can enhance killing of M. tuberculosis. Therefore, pharmacological agents that induce autophagy could be important in combating tuberculosis. We report that the antiprotozoal drug nitazoxanide and its active metabolite tizoxanide strongly stimulate autophagy and inhibit signaling by mTORC1, a major negative regulator of autophagy. Analysis of 16 nitazoxanide analogues reveals similar strict structural requirements for activity in autophagosome induction, EGFP-LC3 processing and mTORC1 inhibition. Nitazoxanide can inhibit M. tuberculosis proliferation in vitro. Here we show that it inhibits M. tuberculosis proliferation more potently in infected human THP-1 cells and peripheral monocytes. We identify the human quinone oxidoreductase NQO1 as a nitazoxanide target and propose, based on experiments with cells expressing NQO1 or not, that NQO1 inhibition is partly responsible for mTORC1 inhibition and enhanced autophagy. The dual action of nitazoxanide on both the bacterium and the host cell response to infection may lead to improved tuberculosis treatment. Tuberculosis is responsible for approximately 2 million deaths worldwide each year. Current treatment regimens require administration of multiple drugs over several months and resistance to these drugs is on the rise. Mycobacterium tuberculosis, the causative agent of the disease, can proliferate within host cells. It has been recently observed that autophagy (cellular self-eating) can kill intracellular M. tuberculosis. We report that the antiprotozoal drug nitazoxanide and its metabolite tizoxanide induce autophagy, inhibit signaling by mTORC1, a major negative regulator of autophagy, and prevent M. tuberculosis proliferation in infected macrophages. We show that nitazoxanide exerts at least some of its pharmacological effects by targeting the quinone reductase NQO1. Our results uncover a novel mechanism of action for the drug nitazoxanide, and show that pharmacological modulation of autophagy can suppress intracellular M. tuberculosis proliferation.
Collapse
|
11
|
Copple IM. The Keap1-Nrf2 cell defense pathway--a promising therapeutic target? ADVANCES IN PHARMACOLOGY (SAN DIEGO, CALIF.) 2012; 63:43-79. [PMID: 22776639 DOI: 10.1016/b978-0-12-398339-8.00002-1] [Citation(s) in RCA: 126] [Impact Index Per Article: 10.5] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 12/19/2022]
Abstract
By regulating the basal and inducible expression of an abundance of detoxification enzymes, antioxidant proteins, xenobiotic transporters and other stress response proteins, the Keap1-Nrf2 pathway plays a crucial role in determining the sensitivity of mammalian cells to chemical and oxidative insults that have the capacity to provoke cellular harm. This review highlights historical and recent advances in our understanding of the molecular mechanisms that regulate the activity of the Keap1-Nrf2 pathway. The important role of Nrf2 in protecting against the onset of specific diseases and drug-induced toxicities is also examined, alongside the emerging role of Nrf2 in promoting oncogenesis and chemotherapeutic drug resistance. A particular emphasis is placed on the potential for translation of this mechanistic understanding into clinical strategies that can improve human health, with consideration of the potential applications of targeting Nrf2 therapeutically.
Collapse
Affiliation(s)
- Ian M Copple
- The University of Liverpool, MRC Centre for Drug Safety Science, Department of Molecular & Clinical Pharmacology, Liverpool, United Kingdom
| |
Collapse
|