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Sun Y, Teng Z, Sun X, Zhang L, Chen J, Wang B, Lu F, Liu N, Yu M, Peng S, Wang Y, Zhao D, Zhao Y, Ren H, Cheng Z, Dong S, Lu F, Zhang W. Exogenous H 2S reduces the acetylation levels of mitochondrial respiratory enzymes via regulating the NAD +-SIRT3 pathway in cardiac tissues of db/db mice. Am J Physiol Endocrinol Metab 2019; 317:E284-E297. [PMID: 31184932 PMCID: PMC6732472 DOI: 10.1152/ajpendo.00326.2018] [Citation(s) in RCA: 30] [Impact Index Per Article: 6.0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Indexed: 01/22/2023]
Abstract
Hydrogen sulfide (H2S), a gaseous molecule, is involved in modulating multiple physiological functions, such as antioxidant, antihypertension, and the production of polysulfide cysteine. H2S may inhibit reactive oxygen species generation and ATP production through modulating respiratory chain enzyme activities; however, the mechanism of this effect remains unclear. In this study, db/db mice, neonatal rat cardiomyocytes, and H9c2 cells treated with high glucose, oleate, and palmitate were used as animal and cellular models of type 2 diabetes. The mitochondrial respiratory rate, respiratory chain complex activities, and ATP production were decreased in db/db mice compared with those in db/db mice treated with exogenous H2S. Liquid chromatography with tandem mass spectrometry analysis showed that the acetylation level of proteins involved in the mitochondrial respiratory chain were increased in the db/db mice hearts compared with those with sodium hydrosulfide (NaHS) treatment. Exogenous H2S restored the ratio of NAD+/NADH, enhanced the expression and activity of sirtuin 3 (SIRT3) and decreased mitochondrial acetylation level in cardiomyocytes under hyperglycemia and hyperlipidemia. As a result of SIRT3 activation, acetylation of the respiratory complexe enzymes NADH dehydrogenase 1 (ND1), ubiquinol cytochrome c reductase core protein 1, and ATP synthase mitochondrial F1 complex assembly factor 1 was reduced, which enhanced the activities of the mitochondrial respiratory chain activity and ATP production. We conclude that exogenous H2S plays a critical role in improving cardiac mitochondrial function in diabetes by upregulating SIRT3.
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MESH Headings
- Acetylation/drug effects
- Animals
- Animals, Newborn
- Cell Respiration/drug effects
- Cells, Cultured
- Diabetes Mellitus, Experimental/metabolism
- Diabetes Mellitus, Experimental/pathology
- Diabetes Mellitus, Type 2/metabolism
- Diabetes Mellitus, Type 2/pathology
- Electron Transport Complex I/drug effects
- Electron Transport Complex I/metabolism
- Electron Transport Complex II/drug effects
- Electron Transport Complex II/metabolism
- Energy Metabolism/drug effects
- Female
- Hydrogen Sulfide/pharmacology
- Male
- Mice
- Mice, Inbred C57BL
- Mice, Transgenic
- Mitochondria/drug effects
- Mitochondria/metabolism
- Mitochondrial Proton-Translocating ATPases/drug effects
- Mitochondrial Proton-Translocating ATPases/metabolism
- Myocytes, Cardiac/drug effects
- Myocytes, Cardiac/metabolism
- NAD/metabolism
- Protein Processing, Post-Translational/drug effects
- Rats
- Rats, Wistar
- Signal Transduction/drug effects
- Sirtuin 3/metabolism
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Affiliation(s)
- Yu Sun
- Department of Pathophysiology, Harbin Medical University , Harbin , China
| | - Zongyan Teng
- Department of Geriatrics, Second Affiliated Hospital of Harbin Medical University , Harbin , China
| | - Xiaojiao Sun
- Department of Pathophysiology, Harbin Medical University , Harbin , China
| | - Linxue Zhang
- Department of Pathophysiology, Harbin Medical University , Harbin , China
| | - Jian Chen
- Department of Pathophysiology, Harbin Medical University , Harbin , China
| | - Bingzhu Wang
- Department of Pathophysiology, Harbin Medical University , Harbin , China
| | - Fangping Lu
- Department of Pathophysiology, Harbin Medical University , Harbin , China
| | - Ning Liu
- Department of Pathophysiology, Harbin Medical University , Harbin , China
| | - Miao Yu
- Department of Pathophysiology, Harbin Medical University , Harbin , China
| | - Shuo Peng
- Department of Pathophysiology, Harbin Medical University , Harbin , China
| | - Yan Wang
- Department of Urologic Surgery, First Affiliated Hospital of Harbin Medical University , Harbin , China
| | - Dechao Zhao
- Department of Cardiology, First affiliated hospital of Harbin Medical University , Harbin , China
| | - Yajun Zhao
- Department of Pathophysiology, Harbin Medical University , Harbin , China
| | - Huan Ren
- Department of Immunology, Harbin Medical University , Harbin , China
| | - Zhongyi Cheng
- Jingjie PTM BioLab, Co., Ltd. (Hangzhou) , Hangzhou , China
| | - Shiyun Dong
- Department of Pathophysiology, Harbin Medical University , Harbin , China
| | - Fanghao Lu
- Department of Pathophysiology, Harbin Medical University , Harbin , China
| | - Weihua Zhang
- Department of Pathophysiology, Harbin Medical University , Harbin , China
- Key Laboratory of Cardiovascular Medicine Research (Harbin Medical University), Ministry of Education , Harbin , China
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Lin Y, Zhai H, Ouyang Y, Lu Z, Chu C, He Q, Cao X. Knockdown of PKM2 enhances radiosensitivity of cervical cancer cells. Cancer Cell Int 2019; 19:129. [PMID: 31114449 PMCID: PMC6518815 DOI: 10.1186/s12935-019-0845-7] [Citation(s) in RCA: 30] [Impact Index Per Article: 6.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/20/2019] [Accepted: 04/30/2019] [Indexed: 12/11/2022] Open
Abstract
Background Pyruvate kinase isozyme type M2 (PKM2) catalyzes the final step in glycolysis and has been found to be up-regulated in multiple human malignancies. However, whether PKM2 regulates the radiosensitivity of human cervical cancer (CC) remains unknown. Methods The expression of PKM2 in 94 patients with CC in the complete response (CR) and noncomplete response (nCR) groups, was evaluated by immunohistochemistry. The effect of PKM2 inhibition on radiosensitivity, the cell cycle, DNA damage, and apoptosis was evaluated by immunofluorescence analysis, colony formation assay, flow cytometry analysis and Western blotting. Results PKM2 expression was more highly expressed in the nCR group than that in CR group and PKM2 expression was enhanced in CC cells after ionizing radiation (IR). In addition, knockdown of PKM2 combined with IR significantly reduced cell growth, promoted apoptosis, and enhanced radiosensitivity. Additionally, knockdown of PKM2 with IR resulted in increased phosphorylation of DNA repair checkpoint proteins (ATM) and phosphorylated-H2AX. Moreover, knockdown of PKM2 combined with IR significantly increased the expression of cleaved caspase 3 and caspase 9, whereas Bcl2 expression was suppressed. Furthermore, knockdown of PKM2 combined with IR markedly reduced the expression of several cancer stem cell biomarkers in vitro, including NANOG, OCT4, SOX2, and Bmi1. Conclusions The results of our study suggests that PKM2 might be involved in mediating CC radiosensitivity and is identified as a potentially important target to enhance radiosensitivity in patients with CC.
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Affiliation(s)
- Yanzhu Lin
- Department of Radiation Oncology, Sun Yat-sen University Cancer Center, State Key Laboratory of Oncology in South China, Collaborative Innovation Center for Cancer Medicine, Guangzhou, China
| | - Hui Zhai
- Gynecology Department, Jinan Maternity and Child Care Hospital, Jinan, China
| | - Yi Ouyang
- Department of Radiation Oncology, Sun Yat-sen University Cancer Center, State Key Laboratory of Oncology in South China, Collaborative Innovation Center for Cancer Medicine, Guangzhou, China
| | - Zhiyuan Lu
- 3Department of Oral and Maxillofacial Surgery, The First Affiliated Hospital, Sun Yat-Sen University, Guangzhou, China
| | - Chengbiao Chu
- Department of Pathology, Sun Yat-sen University Cancer Center, State Key Laboratory of Oncology in South China, Collaborative Innovation Center for Cancer Medicine, Guangzhou, China
| | - Qianting He
- 3Department of Oral and Maxillofacial Surgery, The First Affiliated Hospital, Sun Yat-Sen University, Guangzhou, China
| | - Xinping Cao
- Department of Radiation Oncology, Sun Yat-sen University Cancer Center, State Key Laboratory of Oncology in South China, Collaborative Innovation Center for Cancer Medicine, Guangzhou, China
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Zhu C, Martin HL, Crouch BT, Martinez AF, Li M, Palmer GM, Dewhirst MW, Ramanujam N. Near-simultaneous quantification of glucose uptake, mitochondrial membrane potential, and vascular parameters in murine flank tumors using quantitative diffuse reflectance and fluorescence spectroscopy. BIOMEDICAL OPTICS EXPRESS 2018; 9:3399-3412. [PMID: 29984105 PMCID: PMC6033552 DOI: 10.1364/boe.9.003399] [Citation(s) in RCA: 7] [Impact Index Per Article: 1.2] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Received: 04/20/2018] [Revised: 06/14/2018] [Accepted: 06/18/2018] [Indexed: 05/24/2023]
Abstract
The shifting metabolic landscape of aggressive tumors, with fluctuating oxygenation conditions and temporal changes in glycolysis and mitochondrial metabolism, is a critical phenomenon to study in order to understand negative treatment outcomes. Recently, we have demonstrated near-simultaneous optical imaging of mitochondrial membrane potential (MMP) and glucose uptake in non-tumor window chambers, using the fluorescent probes tetramethylrhodamine ethyl ester (TMRE) and 2-N-(7-nitrobenz-2-oxa-1,3-diazol-4-yl)amino)-2-deoxyglucose (2-NBDG). Here, we demonstrate a complementary technique to perform near-simultaneous in vivo optical spectroscopy of tissue vascular parameters, glucose uptake, and MMP in a solid tumor model that is most often used for therapeutic studies. Our study demonstrates the potential of optical spectroscopy as an effective tool to quantify the vascular and metabolic characteristics of a tumor, which is an important step towards understanding the mechanisms underlying cancer progression, metastasis, and resistance to therapies.
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Affiliation(s)
- Caigang Zhu
- Department of Biomedical Engineering, Duke University, Durham, NC 27708, USA
| | - Hannah L. Martin
- Department of Biomedical Engineering, Duke University, Durham, NC 27708, USA
| | - Brian T. Crouch
- Department of Biomedical Engineering, Duke University, Durham, NC 27708, USA
| | - Amy F. Martinez
- Currently with Office of Research, Vanderbilt University Medical Center, Nashville, TN 37232, USA
| | - Martin Li
- Department of Biomedical Engineering, Duke University, Durham, NC 27708, USA
| | - Gregory M. Palmer
- Department of Radiation Oncology, Duke University, Durham, NC 27710, USA
| | - Mark W. Dewhirst
- Department of Radiation Oncology, Duke University, Durham, NC 27710, USA
| | - Nimmi Ramanujam
- Department of Biomedical Engineering, Duke University, Durham, NC 27708, USA
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Wahba A, Rath BH, Bisht K, Camphausen K, Tofilon PJ. Polysome Profiling Links Translational Control to the Radioresponse of Glioblastoma Stem-like Cells. Cancer Res 2016; 76:3078-87. [PMID: 27005284 DOI: 10.1158/0008-5472.can-15-3050] [Citation(s) in RCA: 23] [Impact Index Per Article: 2.9] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/04/2015] [Accepted: 03/09/2016] [Indexed: 12/14/2022]
Abstract
Changes in polysome-bound mRNA (translatome) are correlated closely with changes in the proteome in cells. Therefore, to better understand the processes mediating the response of glioblastoma to ionizing radiation (IR), we used polysome profiling to define the IR-induced translatomes of a set of human glioblastoma stem-like cell (GSC) lines. Although cell line specificity accounted for the largest proportion of genes within each translatome, there were also genes that were common to the GSC lines. In particular, analyses of the IR-induced common translatome identified components of the DNA damage response, consistent with a role for the translational control of gene expression in cellular radioresponse. Moreover, translatome analyses suggested that IR enhanced cap-dependent translation processes, an effect corroborated by the finding of increased eIF4F-cap complex formation detected after irradiation in all GSC lines. Translatome analyses also predicted that Golgi function was affected by IR. Accordingly, Golgi dispersal was detected after irradiation of each of the GSC lines. In addition to the common responses seen, translatome analyses predicted cell line-specific changes in mitochondria, as substantiated by changes in mitochondrial mass and DNA content. Together, these results suggest that analysis of radiation-induced translatomes can provide new molecular insights concerning the radiation response of cancer cells. More specifically, they suggest that the translational control of gene expression may provide a source of molecular targets for glioblastoma radiosensitization. Cancer Res; 76(10); 3078-87. ©2016 AACR.
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Affiliation(s)
- Amy Wahba
- Radiation Oncology Branch, National Cancer Institute, Bethesda, Maryland
| | - Barbara H Rath
- Radiation Oncology Branch, National Cancer Institute, Bethesda, Maryland
| | - Kheem Bisht
- Radiation Oncology Branch, National Cancer Institute, Bethesda, Maryland
| | - Kevin Camphausen
- Radiation Oncology Branch, National Cancer Institute, Bethesda, Maryland
| | - Philip J Tofilon
- Radiation Oncology Branch, National Cancer Institute, Bethesda, Maryland.
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Inhibition of endogenous hydrogen sulfide production in clear-cell renal cell carcinoma cell lines and xenografts restricts their growth, survival and angiogenic potential. Nitric Oxide 2015; 49:26-39. [PMID: 26068241 DOI: 10.1016/j.niox.2015.06.001] [Citation(s) in RCA: 25] [Impact Index Per Article: 2.8] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/30/2014] [Revised: 05/20/2015] [Accepted: 06/01/2015] [Indexed: 11/21/2022]
Abstract
Clear cell renal cell carcinoma (ccRCC) is characterized by Von Hippel-Lindau (VHL)-deficiency, resulting in pseudohypoxic, angiogenic and glycolytic tumours. Hydrogen sulfide (H2S) is an endogenously-produced gasotransmitter that accumulates under hypoxia and has been shown to be pro-angiogenic and cytoprotective in cancer. It was hypothesized that H2S levels are elevated in VHL-deficient ccRCC, contributing to survival, metabolism and angiogenesis. Using the H2S-specific probe MeRhoAz, it was found that H2S levels were higher in VHL-deficient ccRCC cell lines compared to cells with wild-type VHL. Inhibition of H2S-producing enzymes could reduce the proliferation, metabolism and survival of ccRCC cell lines, as determined by live-cell imaging, XTT/ATP assay, and flow cytometry respectively. Using the chorioallantoic membrane angiogenesis model, it was found that systemic inhibition of endogenous H2S production was able to decrease vascularization of VHL-deficient ccRCC xenografts. Endogenous H2S production is an attractive new target in ccRCC due to its involvement in multiple aspects of disease.
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6
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Mitochondrial biology, targets, and drug delivery. J Control Release 2015; 207:40-58. [PMID: 25841699 DOI: 10.1016/j.jconrel.2015.03.036] [Citation(s) in RCA: 100] [Impact Index Per Article: 11.1] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/16/2015] [Revised: 03/30/2015] [Accepted: 03/31/2015] [Indexed: 02/07/2023]
Abstract
In recent years, mitochondrial medicine has emerged as a new discipline resting at the intersection of mitochondrial biology, pathology, and pharmaceutics. The central role of mitochondria in critical cellular processes such as metabolism and apoptosis has placed mitochondria at the forefront of cell science. Advances in mitochondrial biology have revealed that these organelles continually undergo fusion and fission while functioning independently and in complex cellular networks, establishing direct membrane contacts with each other and with other organelles. Understanding the diverse cellular functions of mitochondria has contributed to understanding mitochondrial dysfunction in disease states. Polyplasmy and heteroplasmy contribute to mitochondrial phenotypes and associated dysfunction. Residing at the center of cell biology, cellular functions, and disease pathology and being laden with receptors and targets, mitochondria are beacons for pharmaceutical modification. This review presents the current state of mitochondrial medicine with a focus on mitochondrial function, dysfunction, and common disease; mitochondrial receptors, targets, and substrates; and mitochondrial drug design and drug delivery with a focus on the application of nanotechnology to mitochondrial medicine. Mitochondrial medicine is at the precipice of clinical translation; the objective of this review is to aid in the advancement of mitochondrial medicine from infancy to application.
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Ostrakhovitch EA, Akakura S, Sanokawa-Akakura R, Goodwin S, Tabibzadeh S. Dedifferentiation of cancer cells following recovery from a potentially lethal damage is mediated by H2S-Nampt. Exp Cell Res 2014; 330:135-50. [PMID: 25278485 DOI: 10.1016/j.yexcr.2014.09.027] [Citation(s) in RCA: 41] [Impact Index Per Article: 4.1] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/01/2014] [Revised: 09/18/2014] [Accepted: 09/20/2014] [Indexed: 12/29/2022]
Abstract
Recently, we reported that cancer cells that recover from a potentially lethal damage gain new phenotypic features comprised of mitochondrial structural remodeling associated with increased glycolytic dependency and drug resistance. Here, we demonstrate that a subset of cancer cells, upon recovery from a potentially lethal damage, undergo dedifferentiation and express genes, which are characteristic of undifferentiated stem cells. While these cells are competent in maintaining differentiated progeny of tumor, they also exhibit transdifferentiation potential. Dedifferentiation is characterized by accumulation of hydrogen sulfide (H2S), which triggers up-regulation of nicotinamide phosphoribosyltransferase (Nampt) accompanied by changes in the redox state. The molecular events triggered by Nampt include elevated production of NAD(+) and up-regulation of H2S producing enzymes, cystathionine beta synthase (CBS) and cystathionase (CTH) with 3-mercaptopyruvate sulfurtransferase (MST) being detectable only in 3D spheroids. Suppression of Nampt, or inactivation of H2S producing enzymes, all reduce H2S production and reverse the ability of cells to dedifferentiate. Moreover, H2S induced stem cell markers in parental cancer cells in a manner similar to that observed in damage recovered cells. These data suggest of existence of a positive feedback loop between H2S and Nampt that controls dedifferentiation in cancer cells that recover from a potentially lethal damage.
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Affiliation(s)
- Elena A Ostrakhovitch
- Frontiers in Bioscience Research Institute in Aging and Cancer, Irvine, CA 92618, USA
| | - Shin Akakura
- Frontiers in Bioscience Research Institute in Aging and Cancer, Irvine, CA 92618, USA
| | | | - Scott Goodwin
- Department of Radiological Sciences, University of California, Irvine, CA 92868, USA
| | - Siamak Tabibzadeh
- Frontiers in Bioscience Research Institute in Aging and Cancer, Irvine, CA 92618, USA; Department of Radiological Sciences, University of California, Irvine, CA 92868, USA.
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Sanokawa-Akakura R, Ostrakhovitch EA, Akakura S, Goodwin S, Tabibzadeh S. A H2S-Nampt dependent energetic circuit is critical to survival and cytoprotection from damage in cancer cells. PLoS One 2014; 9:e108537. [PMID: 25248148 PMCID: PMC4172766 DOI: 10.1371/journal.pone.0108537] [Citation(s) in RCA: 29] [Impact Index Per Article: 2.9] [Reference Citation Analysis] [Abstract] [MESH Headings] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/29/2014] [Accepted: 08/27/2014] [Indexed: 11/18/2022] Open
Abstract
We recently demonstrated that cancer cells that recover from damage exhibit increased aerobic glycolysis, however, the molecular mechanism by which cancer cells survive the damage and show increased aerobic glycolysis remains unknown. Here, we demonstrate that diverse cancer cells that survive hypoxic or oxidative damage show rapid cell proliferation, and develop tolerance to damage associated with increased production of hydrogen sulfide (H2S) which drives up-regulation of nicotinamide phosphoribosyltransferase (Nampt). Consistent with existence of a H2S-Nampt energetic circuit, in damage recovered cancer cells, H2S, Nampt and ATP production exhibit a significant correlation. Moreover, the treatment of cancer cells with H2S donor, NaHS, coordinately increases Nampt and ATP levels, and protects cells from drug induced damage. Inhibition of cystathionine beta synthase (CBS) or cystathionase (CTH), enzymes which drive generation of H2S, decreases Nampt production while suppression of Nampt pathway by FK866, decreases H2S and ATP levels. Damage recovered cells isolated from tumors grown subcutaneously in athymic mice also show increased production of H2S, Nampt and ATP levels, associated with increased glycolysis and rapid proliferation. Together, these data show that upon recovery from potential lethal damage, H2S-Nampt directs energy expenditure and aerobic glycolysis in cancer cells, leads to their exponential growth, and causes a high degree of tolerance to damage. Identification of H2S-Nampt as a pathway responsible for induction of damage tolerance in cancer cells may underlie resistance to therapy and offers the opportunity to target this pathway as a means in treatment of cancer.
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Affiliation(s)
- Reiko Sanokawa-Akakura
- Frontiers in Bioscience Research Institute in Aging and Cancer, Irvine, California, United States of America
| | - Elena A. Ostrakhovitch
- Frontiers in Bioscience Research Institute in Aging and Cancer, Irvine, California, United States of America
| | - Shin Akakura
- Frontiers in Bioscience Research Institute in Aging and Cancer, Irvine, California, United States of America
| | - Scott Goodwin
- Dept of Radiological Sciences, University of California Irvine, Irvine, California, United States of America
| | - Siamak Tabibzadeh
- Frontiers in Bioscience Research Institute in Aging and Cancer, Irvine, California, United States of America
- Dept of Radiological Sciences, University of California Irvine, Irvine, California, United States of America
- * E-mail:
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