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Tan XF, Qin T, Li N, Yang YG, Zheng JH, Xie L, Chen MH. High-potassium preconditioning enhances tolerance to focal cerebral ischemia-reperfusion injury through anti-apoptotic effects in male rats. J Neurosci Res 2019; 97:1253-1265. [PMID: 31240758 DOI: 10.1002/jnr.24483] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/26/2019] [Revised: 05/16/2019] [Accepted: 05/30/2019] [Indexed: 11/07/2022]
Abstract
Imbalances between cellular K+ efflux and influx are considered to be involved in cerebral ischemia-reperfusion (I/R) injury. High-potassium pretreatment alleviates this injury, but the underlying molecular mechanism is unclear. In this study, we sought to investigate whether high-potassium preconditioning enhances cerebral tolerance to I/R injury through an anti-apoptotic mechanism. Adult male Sprague-Dawley rats were randomly divided into four groups (n = 40/group): a sham-operated group, normal saline group (3.2 ml/kg saline, intravenous (IV)), and low-dose and high-dose potassium chloride (KCl) groups (40 and 80 mg/kg KCl solution, IV, respectively). Subsequently, the rats underwent 90 min of middle cerebral artery occlusion (MCAO) followed by 24 hr of reperfusion (MCAO/R). Neurological deficit scores, 2,3,5-triphenyltetrazolium chloride (TTC) staining, hematoxylin and eosin staining, and TUNEL assay were used to assess neural injury. The expression of apoptotic proteins, brain potassium levels, mitochondrial function and oxidative stress were detected to explore the potential mechanism. After 24 hr of reperfusion, in both KCl treatment groups, neurological deficits and the cerebral infarct volume were reduced, and the apoptosis index of neurons was decreased. Furthermore, high-potassium preconditioning increased brain K+ , adenosine triphosphate (ATP), cytochrome c oxidase (COX) levels, reduced malondialdehyde level, improved Na+ /K+ -ATPase, succinic dehydrogenase and superoxide dismutase activities, upregulated anti-apoptotic protein expression, and downregulated pro-apoptotic protein expression. This study suggests that high-potassium preconditioning enhanced cerebral tolerance to I/R injury in a rat MCAO/R model. The protective mechanism may involve apoptosis inhibition via preservation of intracellular K+ and improvement of mitochondrial function.
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Affiliation(s)
- Xiao-Feng Tan
- The Intensive Care Unit, the Second Affiliated Hospital of Guangxi Medical University, Nanning, China
| | - Tao Qin
- The Intensive Care Unit, the Second Affiliated Hospital of Guangxi Medical University, Nanning, China
| | - Nuo Li
- The Intensive Care Unit, the Second Affiliated Hospital of Guangxi Medical University, Nanning, China
| | - Ye-Gui Yang
- The Intensive Care Unit, the Second Affiliated Hospital of Guangxi Medical University, Nanning, China
| | - Jun-Hui Zheng
- The Intensive Care Unit, the Second Affiliated Hospital of Guangxi Medical University, Nanning, China
| | - Lu Xie
- The Department of Physiology, School of Pre-Clinical Science, Guangxi Medical University, Nanning, China
| | - Meng-Hua Chen
- The Intensive Care Unit, the Second Affiliated Hospital of Guangxi Medical University, Nanning, China
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Chhabra A, Mishra S, Kumar G, Gupta A, Keshri GK, Bharti B, Meena RN, Prabhakar AK, Singh DK, Bhargava K, Sharma M. Glucose-6-phosphate dehydrogenase is critical for suppression of cardiac hypertrophy by H 2S. Cell Death Discov 2018; 4:6. [PMID: 29531803 PMCID: PMC5841415 DOI: 10.1038/s41420-017-0010-9] [Citation(s) in RCA: 12] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/10/2017] [Accepted: 11/16/2017] [Indexed: 12/11/2022] Open
Abstract
Hydrogen Sulfide (H2S), recently identified as the third endogenously produced gaseous messenger, is a promising therapeutic prospect for multiple cardio-pathological states, including myocardial hypertrophy. The molecular niche of H2S in normal or diseased cardiac cells is, however, sparsely understood. Here, we show that β-adrenergic receptor (β-AR) overstimulation, known to produce hypertrophic effects in cardiomyocytes, rapidly decreased endogenous H2S levels. The preservation of intracellular H2S levels under these conditions strongly suppressed hypertrophic responses to adrenergic overstimulation, thus suggesting its intrinsic role in this process. Interestingly, unbiased global transcriptome sequencing analysis revealed an integrated metabolic circuitry, centrally linked by NADPH homeostasis, as the direct target of intracellular H2S augmentation. Within these gene networks, glucose-6-phosphate dehydrogenase (G6PD), the first and rate-limiting enzyme (producing NADPH) in pentose phosphate pathway, emerged as the critical node regulating cellular effects of H2S. Utilizing both cellular and animal model systems, we show that H2S-induced elevated G6PD activity is critical for the suppression of cardiac hypertrophy in response to adrenergic overstimulation. We also describe experimental evidences suggesting multiple processes/pathways involved in regulation of G6PD activity, sustained over extended duration of time, in response to endogenous H2S augmentation. Our data, thus, revealed H2S as a critical endogenous regulator of cardiac metabolic circuitry, and also mechanistic basis for its anti-hypertrophic effects.
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Affiliation(s)
- Aastha Chhabra
- Peptide and Proteomics Division, Defence Institute of Physiology and Allied Sciences (DIPAS), Delhi, India
| | - Shalini Mishra
- Peptide and Proteomics Division, Defence Institute of Physiology and Allied Sciences (DIPAS), Delhi, India
| | - Gaurav Kumar
- Peptide and Proteomics Division, Defence Institute of Physiology and Allied Sciences (DIPAS), Delhi, India
| | - Asheesh Gupta
- Biochemical Pharmacology Division, Defence Institute of Physiology and Allied Sciences (DIPAS), DRDO, Delhi, India
| | - Gaurav Kumar Keshri
- Biochemical Pharmacology Division, Defence Institute of Physiology and Allied Sciences (DIPAS), DRDO, Delhi, India
| | - Brij Bharti
- Peptide and Proteomics Division, Defence Institute of Physiology and Allied Sciences (DIPAS), Delhi, India
| | - Ram Niwas Meena
- Peptide and Proteomics Division, Defence Institute of Physiology and Allied Sciences (DIPAS), Delhi, India
| | - Amit Kumar Prabhakar
- Peptide and Proteomics Division, Defence Institute of Physiology and Allied Sciences (DIPAS), Delhi, India
| | | | - Kalpana Bhargava
- Peptide and Proteomics Division, Defence Institute of Physiology and Allied Sciences (DIPAS), Delhi, India
| | - Manish Sharma
- Peptide and Proteomics Division, Defence Institute of Physiology and Allied Sciences (DIPAS), Delhi, India
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Xu L, Li X, Cai M, Chen J, Li X, Wu WKK, Kang W, Tong J, To KF, Guan XY, Sung JJY, Chan FKL, Yu J. Increased expression of Solute carrier family 12 member 5 via gene amplification contributes to tumour progression and metastasis and associates with poor survival in colorectal cancer. Gut 2016; 65:635-46. [PMID: 25947013 PMCID: PMC4819609 DOI: 10.1136/gutjnl-2014-308257] [Citation(s) in RCA: 36] [Impact Index Per Article: 4.5] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 08/14/2014] [Accepted: 01/12/2015] [Indexed: 12/31/2022]
Abstract
OBJECTIVE Using whole genome sequencing, we identified gene amplification of solute carrier family 12 member 5 (SLC12A5) located at 20q13.12 in colorectal cancer (CRC). We analysed its amplification, overexpression, biological effects and prognostic significance in CRC. DESIGN SLC12A5 amplification status was evaluated by fluorescence in situ hybridisation (FISH). The effects of SLC12A5 re-expression or knockdown were determined in proliferation, apoptosis, invasion and metastasis assays. SLC12A5 target genes and related pathways were identified by reporter activity and cDNA microarray analyses. Clinical impact of SLC12A5 overexpression was assessed in 195 patients with CRC. RESULTS Amplification of SLC12A5 was verified in 78 out of 191 (40.8%) patients with primary CRC by FISH, which was positively correlated with its protein overexpression (p<0.001). Biofunctional investigation of SLC12A5 revealed that SLC12A5 significantly increased cell proliferation, G1-S cell cycle transition, invasion/migration abilities, but suppressed apoptosis in vitro and promoted xenograft tumour growth as well as lung metastasis in vivo. The antiapoptosis effect by SLC12A5 was mediated through inhibiting apoptosis-inducing factor and endonuclease G-dependent apoptotic signalling pathway; and the pro-metastasis role was by regulating key elements of the matrix architecture, including matrix metallopeptidase and fibronectin. After a median follow-up of 50.16 months, multivariate analysis revealed that patients with SLC12A5 protein overexpression had a significant decrease in overall survival. Kaplan-Meier survival curves showed that SLC12A5 overexpression was significantly associated with shortened survival in patients with CRC. CONCLUSIONS SLC12A5 plays a pivotal oncogenic role in colorectal carcinogenesis; its overexpression is an independent prognostic factor of patients with CRC.
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Affiliation(s)
- Lixia Xu
- Department of Medicine and Therapeutics, State Key Laboratory of Digestive Disease, Institute of Digestive Disease, Li Ka Shing Institute of Health Sciences, CUHK Shenzhen Research Institute, The Chinese University of Hong Kong, Hong Kong, Hong Kong,Department of Gastroenterology, The First Affiliated Hospital, Sun Yat-sen University, Guangzhou, China
| | - Xiaoxing Li
- Department of Medicine and Therapeutics, State Key Laboratory of Digestive Disease, Institute of Digestive Disease, Li Ka Shing Institute of Health Sciences, CUHK Shenzhen Research Institute, The Chinese University of Hong Kong, Hong Kong, Hong Kong,State Key Laboratory of Oncology in South China, Collaborative Innovation Center for Cancer Medicine, Sun Yat-sen University Cancer Center, Guangzhou, China
| | - Muyan Cai
- State Key Laboratory of Oncology in South China, Collaborative Innovation Center for Cancer Medicine, Sun Yat-sen University Cancer Center, Guangzhou, China
| | - Jinna Chen
- Department of Clinical Oncology, The University of Hong Kong, Hong Kong, Hong Kong
| | - Xiangchun Li
- Department of Medicine and Therapeutics, State Key Laboratory of Digestive Disease, Institute of Digestive Disease, Li Ka Shing Institute of Health Sciences, CUHK Shenzhen Research Institute, The Chinese University of Hong Kong, Hong Kong, Hong Kong
| | - William K K Wu
- Department of Medicine and Therapeutics, State Key Laboratory of Digestive Disease, Institute of Digestive Disease, Li Ka Shing Institute of Health Sciences, CUHK Shenzhen Research Institute, The Chinese University of Hong Kong, Hong Kong, Hong Kong
| | - Wei Kang
- Department of Anatomical and Cellular Pathology, The Chinese University of Hong Kong, Hong Kong, Hong Kong
| | - Joanna Tong
- Department of Anatomical and Cellular Pathology, The Chinese University of Hong Kong, Hong Kong, Hong Kong
| | - Ka-Fai To
- Department of Anatomical and Cellular Pathology, The Chinese University of Hong Kong, Hong Kong, Hong Kong
| | - Xin-Yuan Guan
- Department of Clinical Oncology, The University of Hong Kong, Hong Kong, Hong Kong
| | - Joseph J Y Sung
- Department of Medicine and Therapeutics, State Key Laboratory of Digestive Disease, Institute of Digestive Disease, Li Ka Shing Institute of Health Sciences, CUHK Shenzhen Research Institute, The Chinese University of Hong Kong, Hong Kong, Hong Kong
| | - Francis K L Chan
- Department of Medicine and Therapeutics, State Key Laboratory of Digestive Disease, Institute of Digestive Disease, Li Ka Shing Institute of Health Sciences, CUHK Shenzhen Research Institute, The Chinese University of Hong Kong, Hong Kong, Hong Kong
| | - Jun Yu
- Department of Medicine and Therapeutics, State Key Laboratory of Digestive Disease, Institute of Digestive Disease, Li Ka Shing Institute of Health Sciences, CUHK Shenzhen Research Institute, The Chinese University of Hong Kong, Hong Kong, Hong Kong
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He SL, Tan WH, Zhang ZT, Zhang F, Qu CJ, Lei YX, Zhu YH, Yu HJ, Xiang YZ, Guo X. Mitochondrial-related gene expression profiles suggest an important role of PGC-1alpha in the compensatory mechanism of endemic dilated cardiomyopathy. Exp Cell Res 2013; 319:2604-16. [PMID: 23954821 DOI: 10.1016/j.yexcr.2013.07.018] [Citation(s) in RCA: 9] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/05/2013] [Revised: 07/16/2013] [Accepted: 07/18/2013] [Indexed: 11/25/2022]
Abstract
Keshan disease (KD) is an endemic dilated cardiomyopathy with unclear etiology. In this study, we compared mitochondrial-related gene expression profiles of peripheral blood mononuclear cells (PBMCs) derived from 16 KD patients and 16 normal controls in KD areas. Total RNA was isolated, amplified, labeled and hybridized to Agilent human 4 × 44k whole genome microarrays. Mitochondrial-related genes were screened out by the Third-Generation Human Mitochondria-Focused cDNA Microarray (hMitChip3). Quantitative real-time PCR, immunohistochemical and biochemical parameters related mitochondrial metabolism were conducted to validate our microarray results. In KD samples, 34 up-regulated genes (ratios ≥ 2.0) were detected by significance analysis of microarrays and ingenuity systems pathway analysis (IPA). The highest ranked molecular and cellular functions of the differentially regulated genes were closely related to amino acid metabolism, free radical scavenging, carbohydrate metabolism, and energy production. Using IPA, 40 significant pathways and four significant networks, involved mainly in apoptosis, mitochondrion dysfunction, and nuclear receptor signaling were identified. Based on our results, we suggest that PGC-1alpha regulated energy metabolism and anti-apoptosis might play an important role in the compensatory mechanism of KD. Our results may lead to the identification of potential diagnostic biomarkers for KD in PBMCs, and may help to understand the pathogenesis of KD.
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Affiliation(s)
- Shu-Lan He
- Key Laboratory of Environment and Gene Related Diseases, Xi'an Jiaotong University, Ministry Education, No. 76 Yanta West Road, Xi'an, Shaanxi 710061, PR China; Key Laboratory of Trace Elements and Endemic Diseases, Xi'an Jiaotong University, Ministry of Health, No. 76 Yanta West Road, Xi'an, Shaanxi 710061, PR China
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