1
|
Distinct Roles of Nrf1 and Nrf2 in Monitoring the Reductive Stress Response to Dithiothreitol (DTT). Antioxidants (Basel) 2022; 11:antiox11081535. [PMID: 36009254 PMCID: PMC9405177 DOI: 10.3390/antiox11081535] [Citation(s) in RCA: 6] [Impact Index Per Article: 3.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/09/2022] [Revised: 07/29/2022] [Accepted: 08/02/2022] [Indexed: 11/17/2022] Open
Abstract
Transcription factor Nrf2 (nuclear factor, erythroid 2-like 2, encoded by Nfe2l2) has been accepted as a key player in redox regulatory responses to oxidative or reductive stresses. However, relatively little is known about the potential role of Nrf1 (nuclear factor, erythroid 2-like 1, encoded by Nfe2l1) in the redox responses, particularly to reductive stress, although this ‘fossil-like’ factor is indispensable for cell homeostasis and organ integrity during the life process. Herein, we examine distinct roles of Nrf1 and Nrf2 in monitoring the defense response to 1,4–dithiothreitol (DTT, serving as a reductive stressor), concomitantly with unfolded protein response being induced by this chemical (also defined as an endoplasmic reticulum stressor). The results revealed that intracellular reactive oxygen species (ROS) were modestly increased in DTT-treated wild-type (WT) and Nrf1α−/− cell lines, but almost unaltered in Nrf2−/−ΔTA or caNrf2ΔN cell lines (with a genetic loss of transactivation or N-terminal Keap1-binding domains, respectively). This chemical treatment also enabled the rate of oxidized to reduced glutathione (i.e., GSSG to GSH) to be amplified in WT and Nrf2−/−ΔTA cells, but diminished in Nrf1α−/− cells, along with no changes in caNrf2ΔN cells. Consequently, Nrf1α−/−, but not Nrf2−/−ΔTA or caNrf2ΔN, cell viability was reinforced by DTT against its cytotoxicity, as accompanied by decreased apoptosis. Further experiments unraveled that Nrf1 and Nrf2 differentially, and also synergistically, regulated DTT-inducible expression of critical genes for defending against redox stress and endoplasmic reticulum stress. In addition, we also identified that Cys342 and Cys640 of Nrf1 (as redox-sensing sites within its N-glycodomain and DNA-binding domain, respectively) are required for its protein stability and transcription activity.
Collapse
|
2
|
Kumar RA, Thome T, Sharaf OM, Ryan TE, Arnaoutakis GJ, Jeng EI, Ferreira LF. Reversible Thiol Oxidation Increases Mitochondrial Electron Transport Complex Enzyme Activity but Not Respiration in Cardiomyocytes from Patients with End-Stage Heart Failure. Cells 2022; 11:cells11152292. [PMID: 35892589 PMCID: PMC9330889 DOI: 10.3390/cells11152292] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/30/2022] [Revised: 07/19/2022] [Accepted: 07/21/2022] [Indexed: 12/10/2022] Open
Abstract
Cardiomyocyte dysfunction in patients with end-stage heart failure with reduced ejection fraction (HFrEF) stems from mitochondrial dysfunction, which contributes to an energetic crisis. Mitochondrial dysfunction reportedly relates to increased markers of oxidative stress, but the impact of reversible thiol oxidation on myocardial mitochondrial function in patients with HFrEF has not been investigated. In the present study, we assessed mitochondrial function in ventricular biopsies from patients with end-stage HFrEF in the presence and absence of the thiol-reducing agent dithiothreitol (DTT). Isolated mitochondria exposed to DTT had increased enzyme activity of complexes I (p = 0.009) and III (p = 0.018) of the electron transport system, while complexes II (p = 0.630) and IV (p = 0.926) showed no changes. However, increased enzyme activity did not carry over to measurements of mitochondrial respiration in permeabilized bundles. Oxidative phosphorylation conductance (p = 0.439), maximal respiration (p = 0.312), and ADP sensitivity (p = 0.514) were unchanged by 5 mM DTT treatment. These results indicate that mitochondrial function can be modulated through reversible thiol oxidation, but other components of mitochondrial energy transfer are rate limiting in end-stage HFrEF. Optimal therapies to normalize cardiac mitochondrial respiration in patients with end-stage HFrEF may benefit from interventions to reverse thiol oxidation, which limits complex I and III activities.
Collapse
Affiliation(s)
- Ravi A. Kumar
- Department of Applied Physiology and Kinesiology, University of Florida, Gainesville, FL 32611, USA; (R.A.K.); (T.T.); (T.E.R.)
| | - Trace Thome
- Department of Applied Physiology and Kinesiology, University of Florida, Gainesville, FL 32611, USA; (R.A.K.); (T.T.); (T.E.R.)
| | - Omar M. Sharaf
- College of Medicine, University of Florida, Gainesville, FL 32611, USA;
| | - Terence E. Ryan
- Department of Applied Physiology and Kinesiology, University of Florida, Gainesville, FL 32611, USA; (R.A.K.); (T.T.); (T.E.R.)
| | - George J. Arnaoutakis
- Department of Surgery, Division of Thoracic and Cardiovascular Surgery, University of Florida, Gainesville, FL 32611, USA; (G.J.A.); (E.I.J.)
| | - Eric I. Jeng
- Department of Surgery, Division of Thoracic and Cardiovascular Surgery, University of Florida, Gainesville, FL 32611, USA; (G.J.A.); (E.I.J.)
| | - Leonardo F. Ferreira
- Department of Applied Physiology and Kinesiology, University of Florida, Gainesville, FL 32611, USA; (R.A.K.); (T.T.); (T.E.R.)
- Department of Physiology, Amsterdam UMC, 1081 HZ Amsterdam, The Netherlands
- Correspondence: ; Tel.: +1-352-294-1724
| |
Collapse
|
3
|
Ommati MM, Farshad O, Niknahad H, Mousavi K, Moein M, Azarpira N, Mohammadi H, Jamshidzadeh A, Heidari R. Oral administration of thiol-reducing agents mitigates gut barrier disintegrity and bacterial lipopolysaccharide translocation in a rat model of biliary obstruction. CURRENT RESEARCH IN PHARMACOLOGY AND DRUG DISCOVERY 2020; 1:10-18. [PMID: 34909638 PMCID: PMC8663936 DOI: 10.1016/j.crphar.2020.06.001] [Citation(s) in RCA: 13] [Impact Index Per Article: 3.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/30/2020] [Revised: 05/28/2020] [Accepted: 06/10/2020] [Indexed: 12/15/2022] Open
Abstract
It has been well documented that cirrhosis is associated with the intestinal injury. Intestinal injury in cirrhosis could lead to bacterial lipopolysaccharide (LPS) translocation to the systemic circulation. It has been found that high plasma LPS is connected with higher morbidity and mortality in cirrhotic patients. Therefore, finding therapeutic approaches to mitigate this complication has great clinical value. Several investigations mentioned the pivotal role of oxidative stress in cirrhosis-associated intestinal injury. It has been well-known that the redox balance of enterocytes is disturbed in cirrhotic patients. In the current study, the effects of thiol-reducing agents N-acetylcysteine (NAC) (0.5 and 1% w: v) and dithiothreitol (DTT) (0.5 and 1% w: v) on biomarkers of oxidative stress, tissue histopathological alterations, and LPS translocation is investigated in a rat model of cirrhosis. Bile duct ligation (BDL) surgery was used to induce cirrhosis in male Sprague-Dawley rats. Animals (n = 48; 8 animals/group) were supplemented with NAC and DTT for 28 consecutive days. Significant changes in ileum and colon markers of oxidative stress were evident in BDL rats as judged by increased reactive oxygen species (ROS), lipid peroxidation, oxidized glutathione (GSSG), and protein carbonylation along with decreased antioxidant capacity and glutathione (GSH) content. Blunted villus, decreased villus number, and inflammation was also detected in the intestine of BDL animals. Moreover, serum LPS level was also significantly higher in BDL rats. NAC and DTT administration (0.5 and 1% w: v, gavage) significantly decreased biomarkers of oxidative stress, mitigated intestinal histopathological alterations, and restored tissue antioxidant capacity. Moreover, NAC and/or DTT significantly suppressed LPS translocation to the systemic circulation. The protective effects of thiol reducing agents in the intestine of cirrhotic rats could be attributed to the effect of these chemicals on the cellular redox environment and biomarkers of oxidative stress. Gut permeability is a clinical complication in cholestasis/cirrhosis Intestinal injury leads to lipopolysaccharide (LPS) translocation to the bloodstream LPS translocation to the systemic circulation could cause systemic inflammation Oxidative stress is involved in the mechanisms of cirrhosis-induced gut permeability Oral administration of thiol-reducing agents mitigated intestinal tissue oxidative stress Serum LPS levels were lower in thiol reducing agents-treated animals
Collapse
Affiliation(s)
- Mohammad Mehdi Ommati
- College of Life Sciences, Shanxi Agricultural University, Taigu, Shanxi 030801, PR China
| | - Omid Farshad
- Pharmaceutical Sciences Research Center, Shiraz University of Medical Sciences, Shiraz, Iran
| | - Hossein Niknahad
- Pharmaceutical Sciences Research Center, Shiraz University of Medical Sciences, Shiraz, Iran
- Department of Pharmacology and Toxicology, School of Pharmacy, Shiraz University of Medical Sciences, Shiraz, Iran
| | - Khadijeh Mousavi
- Department of Pharmacology and Toxicology, School of Pharmacy, Shiraz University of Medical Sciences, Shiraz, Iran
| | - Marjan Moein
- Department of Pharmacology and Toxicology, School of Pharmacy, Shiraz University of Medical Sciences, Shiraz, Iran
| | - Negar Azarpira
- Transplant Research Center, Shiraz University of Medical Sciences, Shiraz, Iran
| | - Hamidreza Mohammadi
- Department of Pharmacology and Toxicology, School of Pharmacy, Shiraz University of Medical Sciences, Shiraz, Iran
| | - Akram Jamshidzadeh
- Pharmaceutical Sciences Research Center, Shiraz University of Medical Sciences, Shiraz, Iran
- Department of Pharmacology and Toxicology, School of Pharmacy, Shiraz University of Medical Sciences, Shiraz, Iran
- Corresponding author. Pharmaceutical Sciences Research Center, Shiraz University of Medical Sciences, Shiraz, Iran. Fax: +987132424127.
| | - Reza Heidari
- Pharmaceutical Sciences Research Center, Shiraz University of Medical Sciences, Shiraz, Iran
- Corresponding author. Pharmaceutical Sciences Research Center, Shiraz University of Medical Sciences, Shiraz, Iran. Fax: +987132424127.
| |
Collapse
|
4
|
Ma WX, Li CY, Tao R, Wang XP, Yan LJ. Reductive Stress-Induced Mitochondrial Dysfunction and Cardiomyopathy. OXIDATIVE MEDICINE AND CELLULAR LONGEVITY 2020; 2020:5136957. [PMID: 32566086 PMCID: PMC7277050 DOI: 10.1155/2020/5136957] [Citation(s) in RCA: 20] [Impact Index Per Article: 5.0] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Download PDF] [Figures] [Subscribe] [Scholar Register] [Received: 12/12/2019] [Revised: 04/26/2020] [Accepted: 05/12/2020] [Indexed: 02/05/2023]
Abstract
The goal of this review was to summarize reported studies focusing on cellular reductive stress-induced mitochondrial dysfunction, cardiomyopathy, dithiothreitol- (DTT-) induced reductive stress, and reductive stress-related free radical reactions published in the past five years. Reductive stress is considered to be a double-edged sword in terms of antioxidation and disease induction. As many underlying mechanisms are still unclear, further investigations are obviously warranted. Nonetheless, reductive stress is thought to be caused by elevated levels of cellular reducing power such as NADH, glutathione, and NADPH; and this area of research has attracted increasing attention lately. Albeit, we think there is a need to conduct further studies in identifying more indicators of the risk assessment and prevention of developing heart damage as well as exploring more targets for cardiomyopathy treatment. Hence, it is expected that further investigation of underlying mechanisms of reductive stress-induced mitochondrial dysfunction will provide novel insights into therapeutic approaches for ameliorating reductive stress-induced cardiomyopathy.
Collapse
Affiliation(s)
- Wei-Xing Ma
- Department of Pharmaceutical Sciences, UNT System College of Pharmacy, University of North Texas Health Science Center (UNTHSC), Fort Worth, Texas 76107, USA
- Qingdao University of Science and Technology, 266042 Qingdao, Shandong, China
| | - Chun-Yan Li
- Department of Pharmaceutical Sciences, UNT System College of Pharmacy, University of North Texas Health Science Center (UNTHSC), Fort Worth, Texas 76107, USA
- Shantou University Medical College, 515041 Shantou, Guangdong, China
| | - Ran Tao
- Qingdao Municipal Center for Disease Control & Prevention, 266034 Qingdao, Shandong, China
| | - Xin-Ping Wang
- Qingdao University of Science and Technology, 266042 Qingdao, Shandong, China
| | - Liang-Jun Yan
- Department of Pharmaceutical Sciences, UNT System College of Pharmacy, University of North Texas Health Science Center (UNTHSC), Fort Worth, Texas 76107, USA
| |
Collapse
|
5
|
Li K, Zhang J, Cao J, Li X, Tian H. 1,4-Dithiothreitol treatment ameliorates hematopoietic and intestinal injury in irradiated mice: Potential application of a treatment for acute radiation syndrome. Int Immunopharmacol 2019; 76:105913. [PMID: 31627170 DOI: 10.1016/j.intimp.2019.105913] [Citation(s) in RCA: 12] [Impact Index Per Article: 2.4] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/19/2019] [Revised: 08/29/2019] [Accepted: 09/12/2019] [Indexed: 01/07/2023]
Abstract
Radiation exposure poses a significant threat to public health, which can lead to acute hematopoietic system and intestinal system injuries due to their higher radiation sensitivity. Hence, antioxidants and thiol-reducing agents could have a potential protective effect against this complication. The dithiol compound 1,4-dithiothreitol (DTT) has been used in biochemistry, peptide/protein chemistry and clinical medicine. However, the effect of DTT on ionizing radiation (IR)-induced hematopoietic injury and intestinal injury are unknown. The current investigation was designed to evaluate the effect of DTT as a safe and clinically applicable thiol-radioprotector in irradiated mice. DTT treatment improved the survival of irradiated mice and ameliorated whole body irradiation (WBI)-induced hematopoietic injury by attenuating myelosuppression and myeloid skewing, increasing self-renewal and differentiation of hematopoietic progenitor cells/hematopoietic stem cells (HPCs/HSCs). In addition, DTT treatment protected mice from abdominal irradiation (ABI)-induced changes in crypt-villus structures and function. Furthermore, treatment with DTT significantly enhanced the ABI-induced reduction in Olfm4 positive cells and offspring cells of Lgr5+ stem cells, including lysozyme+ Paneth cells and Ki67+ cells. Moreover, IR-induced DNA strand break damage, and the expression of proapoptotic-p53, Bax, Bak protein and antiapoptotic-Bcl-2 protein were reversed in DTT treated mice, and DTT also promoted small intestine repair after radiation exposure via the p53 intrinsic apoptotic pathway. In general, these results demonstrated the potential of DTT for protection against hematopoietic injury and intestinal injury after radiation exposure, suggesting DTT as a novel effective agent for radioprotection.
Collapse
Affiliation(s)
- Kui Li
- Tianjin Key Laboratory of Radiation Medicine and Molecular Nuclear Medicine, Institute of Radiation Medicine, Chinese Academy of Medical Science & Peking Union Medical College, Tianjin 300192, China
| | - Junling Zhang
- Tianjin Key Laboratory of Radiation Medicine and Molecular Nuclear Medicine, Institute of Radiation Medicine, Chinese Academy of Medical Science & Peking Union Medical College, Tianjin 300192, China
| | - Jian Cao
- Tianjin Key Laboratory of Radiation Medicine and Molecular Nuclear Medicine, Institute of Radiation Medicine, Chinese Academy of Medical Science & Peking Union Medical College, Tianjin 300192, China
| | - Xuejiao Li
- Tianjin Key Laboratory of Radiation Medicine and Molecular Nuclear Medicine, Institute of Radiation Medicine, Chinese Academy of Medical Science & Peking Union Medical College, Tianjin 300192, China
| | - Hongqi Tian
- Tianjin Key Laboratory of Radiation Medicine and Molecular Nuclear Medicine, Institute of Radiation Medicine, Chinese Academy of Medical Science & Peking Union Medical College, Tianjin 300192, China.
| |
Collapse
|
6
|
Heidari R, Ghanbarinejad V, Mohammadi H, Ahmadi A, Esfandiari A, Azarpira N, Niknahad H. Dithiothreitol supplementation mitigates hepatic and renal injury in bile duct ligated mice: Potential application in the treatment of cholestasis-associated complications. Biomed Pharmacother 2018; 99:1022-1032. [DOI: 10.1016/j.biopha.2018.01.018] [Citation(s) in RCA: 28] [Impact Index Per Article: 4.7] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/07/2017] [Revised: 12/29/2017] [Accepted: 01/03/2018] [Indexed: 01/18/2023] Open
|