151
|
Hattori Y, Okamoto Y, Maki T, Yamamoto Y, Oishi N, Yamahara K, Nagatsuka K, Takahashi R, Kalaria RN, Fukuyama H, Kinoshita M, Ihara M. Silent information regulator 2 homolog 1 counters cerebral hypoperfusion injury by deacetylating endothelial nitric oxide synthase. Stroke 2014; 45:3403-11. [PMID: 25213338 DOI: 10.1161/strokeaha.114.006265] [Citation(s) in RCA: 56] [Impact Index Per Article: 5.6] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/16/2022]
Abstract
BACKGROUND AND PURPOSE Silent information regulator 2 homolog 1 (SIRT1) is a protein deacetylase that has been reported to suppress neurodegenerative and cardiovascular diseases in model organisms. We hypothesized that neurovascular protection is one of the diverse actions of SIRT1. This study was designed to determine whether SIRT1 protects against the consequences of cerebral hypoperfusion in vivo. METHODS Sirt1-overexpressing (Sirt1-Tg) mice driven by a prion promoter and their wild-type littermates were subjected to bilateral common carotid artery stenosis using external microcoils. Using Sirt1-Tg mice, we assessed the effect of SIRT1 on cerebral blood flow, cerebral angioarchitecture, histological and ultrastructural changes, and spatial working memory at several time points. We also evaluated the effects of preadministration of SIRT1 inhibitors or endothelial nitric oxide synthase inhibitors on cerebral blood flow after bilateral common carotid artery stenosis in Sirt1-Tg mice. Levels of acetylated and nonacetylated endothelial nitric oxide synthase were measured semiquantitatively with immunoblotting. RESULTS Cerebral hypoperfusion induced by bilateral common carotid artery stenosis caused memory impairment and histological changes in wild-type littermates. However, these phenotypes were rescued in Sirt1-Tg mice, where cerebral blood flow was maintained even poststenosis. Electron microscopic analyses showed irregularities in the vascular endothelia, such as tight junction openings in wild-type mice, which were absent in Sirt1-Tg littermates. Brain endothelial nitric oxide synthase was acetylated after cerebral hypoperfusion in wild-type littermates but remained unacetylated in Sirt1-Tg mice. Moreover, treatment with SIRT1 inhibitors and endothelial nitric oxide synthase inhibitors abolished the vasculoprotective effects of SIRT1. CONCLUSIONS Our results indicate that neurovascular endothelial SIRT1 potentiation upregulates the nitric oxide system and counters cerebral hypoperfusion injury. This novel cerebral blood flow-preserving mechanism offers potential molecular targets for future therapeutic intervention.
Collapse
Affiliation(s)
- Yorito Hattori
- From the Department of Neurology (Y.H., R.T.) and Human Brain Research Center (N.O., H.F.), Kyoto University Graduate School of Medicine, Kyoto, Japan; Departments of Regenerative Medicine and Tissue Engineering (Y.H., Y.Y., K.Y., M.I.), Pathology (Y.O.), and Stroke and Cerebrovascular Diseases (K.N., M.I.), National Cerebral and Cardiovascular Center, Osaka, Japan; Departments of Radiology and Neurology, Massachusetts General Hospital and Harvard Medical School, Boston (T.M.); CREST, Japan Science Technology Corporation, Saitama, Japan (R.T., M.K.); Institute for Ageing and Health, Newcastle University, Campus for Ageing and Vitality, Newcastle Upon Tyne, United Kingdom (R.N.K.); and Division of Biological Science, Nagoya University Graduate School of Science, Nagoya, Japan (M.K.)
| | - Yoko Okamoto
- From the Department of Neurology (Y.H., R.T.) and Human Brain Research Center (N.O., H.F.), Kyoto University Graduate School of Medicine, Kyoto, Japan; Departments of Regenerative Medicine and Tissue Engineering (Y.H., Y.Y., K.Y., M.I.), Pathology (Y.O.), and Stroke and Cerebrovascular Diseases (K.N., M.I.), National Cerebral and Cardiovascular Center, Osaka, Japan; Departments of Radiology and Neurology, Massachusetts General Hospital and Harvard Medical School, Boston (T.M.); CREST, Japan Science Technology Corporation, Saitama, Japan (R.T., M.K.); Institute for Ageing and Health, Newcastle University, Campus for Ageing and Vitality, Newcastle Upon Tyne, United Kingdom (R.N.K.); and Division of Biological Science, Nagoya University Graduate School of Science, Nagoya, Japan (M.K.)
| | - Takakuni Maki
- From the Department of Neurology (Y.H., R.T.) and Human Brain Research Center (N.O., H.F.), Kyoto University Graduate School of Medicine, Kyoto, Japan; Departments of Regenerative Medicine and Tissue Engineering (Y.H., Y.Y., K.Y., M.I.), Pathology (Y.O.), and Stroke and Cerebrovascular Diseases (K.N., M.I.), National Cerebral and Cardiovascular Center, Osaka, Japan; Departments of Radiology and Neurology, Massachusetts General Hospital and Harvard Medical School, Boston (T.M.); CREST, Japan Science Technology Corporation, Saitama, Japan (R.T., M.K.); Institute for Ageing and Health, Newcastle University, Campus for Ageing and Vitality, Newcastle Upon Tyne, United Kingdom (R.N.K.); and Division of Biological Science, Nagoya University Graduate School of Science, Nagoya, Japan (M.K.)
| | - Yumi Yamamoto
- From the Department of Neurology (Y.H., R.T.) and Human Brain Research Center (N.O., H.F.), Kyoto University Graduate School of Medicine, Kyoto, Japan; Departments of Regenerative Medicine and Tissue Engineering (Y.H., Y.Y., K.Y., M.I.), Pathology (Y.O.), and Stroke and Cerebrovascular Diseases (K.N., M.I.), National Cerebral and Cardiovascular Center, Osaka, Japan; Departments of Radiology and Neurology, Massachusetts General Hospital and Harvard Medical School, Boston (T.M.); CREST, Japan Science Technology Corporation, Saitama, Japan (R.T., M.K.); Institute for Ageing and Health, Newcastle University, Campus for Ageing and Vitality, Newcastle Upon Tyne, United Kingdom (R.N.K.); and Division of Biological Science, Nagoya University Graduate School of Science, Nagoya, Japan (M.K.)
| | - Naoya Oishi
- From the Department of Neurology (Y.H., R.T.) and Human Brain Research Center (N.O., H.F.), Kyoto University Graduate School of Medicine, Kyoto, Japan; Departments of Regenerative Medicine and Tissue Engineering (Y.H., Y.Y., K.Y., M.I.), Pathology (Y.O.), and Stroke and Cerebrovascular Diseases (K.N., M.I.), National Cerebral and Cardiovascular Center, Osaka, Japan; Departments of Radiology and Neurology, Massachusetts General Hospital and Harvard Medical School, Boston (T.M.); CREST, Japan Science Technology Corporation, Saitama, Japan (R.T., M.K.); Institute for Ageing and Health, Newcastle University, Campus for Ageing and Vitality, Newcastle Upon Tyne, United Kingdom (R.N.K.); and Division of Biological Science, Nagoya University Graduate School of Science, Nagoya, Japan (M.K.)
| | - Kenichi Yamahara
- From the Department of Neurology (Y.H., R.T.) and Human Brain Research Center (N.O., H.F.), Kyoto University Graduate School of Medicine, Kyoto, Japan; Departments of Regenerative Medicine and Tissue Engineering (Y.H., Y.Y., K.Y., M.I.), Pathology (Y.O.), and Stroke and Cerebrovascular Diseases (K.N., M.I.), National Cerebral and Cardiovascular Center, Osaka, Japan; Departments of Radiology and Neurology, Massachusetts General Hospital and Harvard Medical School, Boston (T.M.); CREST, Japan Science Technology Corporation, Saitama, Japan (R.T., M.K.); Institute for Ageing and Health, Newcastle University, Campus for Ageing and Vitality, Newcastle Upon Tyne, United Kingdom (R.N.K.); and Division of Biological Science, Nagoya University Graduate School of Science, Nagoya, Japan (M.K.)
| | - Kazuyuki Nagatsuka
- From the Department of Neurology (Y.H., R.T.) and Human Brain Research Center (N.O., H.F.), Kyoto University Graduate School of Medicine, Kyoto, Japan; Departments of Regenerative Medicine and Tissue Engineering (Y.H., Y.Y., K.Y., M.I.), Pathology (Y.O.), and Stroke and Cerebrovascular Diseases (K.N., M.I.), National Cerebral and Cardiovascular Center, Osaka, Japan; Departments of Radiology and Neurology, Massachusetts General Hospital and Harvard Medical School, Boston (T.M.); CREST, Japan Science Technology Corporation, Saitama, Japan (R.T., M.K.); Institute for Ageing and Health, Newcastle University, Campus for Ageing and Vitality, Newcastle Upon Tyne, United Kingdom (R.N.K.); and Division of Biological Science, Nagoya University Graduate School of Science, Nagoya, Japan (M.K.)
| | - Ryosuke Takahashi
- From the Department of Neurology (Y.H., R.T.) and Human Brain Research Center (N.O., H.F.), Kyoto University Graduate School of Medicine, Kyoto, Japan; Departments of Regenerative Medicine and Tissue Engineering (Y.H., Y.Y., K.Y., M.I.), Pathology (Y.O.), and Stroke and Cerebrovascular Diseases (K.N., M.I.), National Cerebral and Cardiovascular Center, Osaka, Japan; Departments of Radiology and Neurology, Massachusetts General Hospital and Harvard Medical School, Boston (T.M.); CREST, Japan Science Technology Corporation, Saitama, Japan (R.T., M.K.); Institute for Ageing and Health, Newcastle University, Campus for Ageing and Vitality, Newcastle Upon Tyne, United Kingdom (R.N.K.); and Division of Biological Science, Nagoya University Graduate School of Science, Nagoya, Japan (M.K.)
| | - Raj N Kalaria
- From the Department of Neurology (Y.H., R.T.) and Human Brain Research Center (N.O., H.F.), Kyoto University Graduate School of Medicine, Kyoto, Japan; Departments of Regenerative Medicine and Tissue Engineering (Y.H., Y.Y., K.Y., M.I.), Pathology (Y.O.), and Stroke and Cerebrovascular Diseases (K.N., M.I.), National Cerebral and Cardiovascular Center, Osaka, Japan; Departments of Radiology and Neurology, Massachusetts General Hospital and Harvard Medical School, Boston (T.M.); CREST, Japan Science Technology Corporation, Saitama, Japan (R.T., M.K.); Institute for Ageing and Health, Newcastle University, Campus for Ageing and Vitality, Newcastle Upon Tyne, United Kingdom (R.N.K.); and Division of Biological Science, Nagoya University Graduate School of Science, Nagoya, Japan (M.K.)
| | - Hidenao Fukuyama
- From the Department of Neurology (Y.H., R.T.) and Human Brain Research Center (N.O., H.F.), Kyoto University Graduate School of Medicine, Kyoto, Japan; Departments of Regenerative Medicine and Tissue Engineering (Y.H., Y.Y., K.Y., M.I.), Pathology (Y.O.), and Stroke and Cerebrovascular Diseases (K.N., M.I.), National Cerebral and Cardiovascular Center, Osaka, Japan; Departments of Radiology and Neurology, Massachusetts General Hospital and Harvard Medical School, Boston (T.M.); CREST, Japan Science Technology Corporation, Saitama, Japan (R.T., M.K.); Institute for Ageing and Health, Newcastle University, Campus for Ageing and Vitality, Newcastle Upon Tyne, United Kingdom (R.N.K.); and Division of Biological Science, Nagoya University Graduate School of Science, Nagoya, Japan (M.K.)
| | - Makoto Kinoshita
- From the Department of Neurology (Y.H., R.T.) and Human Brain Research Center (N.O., H.F.), Kyoto University Graduate School of Medicine, Kyoto, Japan; Departments of Regenerative Medicine and Tissue Engineering (Y.H., Y.Y., K.Y., M.I.), Pathology (Y.O.), and Stroke and Cerebrovascular Diseases (K.N., M.I.), National Cerebral and Cardiovascular Center, Osaka, Japan; Departments of Radiology and Neurology, Massachusetts General Hospital and Harvard Medical School, Boston (T.M.); CREST, Japan Science Technology Corporation, Saitama, Japan (R.T., M.K.); Institute for Ageing and Health, Newcastle University, Campus for Ageing and Vitality, Newcastle Upon Tyne, United Kingdom (R.N.K.); and Division of Biological Science, Nagoya University Graduate School of Science, Nagoya, Japan (M.K.)
| | - Masafumi Ihara
- From the Department of Neurology (Y.H., R.T.) and Human Brain Research Center (N.O., H.F.), Kyoto University Graduate School of Medicine, Kyoto, Japan; Departments of Regenerative Medicine and Tissue Engineering (Y.H., Y.Y., K.Y., M.I.), Pathology (Y.O.), and Stroke and Cerebrovascular Diseases (K.N., M.I.), National Cerebral and Cardiovascular Center, Osaka, Japan; Departments of Radiology and Neurology, Massachusetts General Hospital and Harvard Medical School, Boston (T.M.); CREST, Japan Science Technology Corporation, Saitama, Japan (R.T., M.K.); Institute for Ageing and Health, Newcastle University, Campus for Ageing and Vitality, Newcastle Upon Tyne, United Kingdom (R.N.K.); and Division of Biological Science, Nagoya University Graduate School of Science, Nagoya, Japan (M.K.).
| |
Collapse
|
153
|
Guo P, Pi H, Xu S, Zhang L, Li Y, Li M, Cao Z, Tian L, Xie J, Li R, He M, Lu Y, Liu C, Duan W, Yu Z, Zhou Z. Melatonin Improves mitochondrial function by promoting MT1/SIRT1/PGC-1 alpha-dependent mitochondrial biogenesis in cadmium-induced hepatotoxicity in vitro. Toxicol Sci 2014; 142:182-95. [PMID: 25159133 PMCID: PMC4226765 DOI: 10.1093/toxsci/kfu164] [Citation(s) in RCA: 103] [Impact Index Per Article: 10.3] [Reference Citation Analysis] [Abstract] [Key Words] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/15/2023] Open
Abstract
Melatonin is an indolamine synthesized in the pineal gland that has a wide range of physiological functions, and it has been under clinical investigation for expanded applications. Increasing evidence demonstrates that melatonin can ameliorate cadmium-induced hepatotoxicity. However, the potentially protective effects of melatonin against cadmium-induced hepatotoxicity and the underlying mechanisms of this protection remain unclear. This study investigates the protective effects of melatonin pretreatment on cadmium-induced hepatotoxicity and elucidates the potential mechanism of melatonin-mediated protection. We exposed HepG2 cells to different concentrations of cadmium chloride (2.5, 5, and 10μM) for 12 h. We found that Cd stimulated cytotoxicity, disrupted the mitochondrial membrane potential, increased reactive oxygen species production, and decreased mitochondrial mass and mitochondrial DNA content. Consistent with this finding, Cd exposure was associated with decreased Sirtuin 1 (SIRT1) protein expression and activity, thus promoted acetylation of PGC-1 alpha, a key enzyme involved in mitochondrial biogenesis and function, although Cd did not disrupt the interaction between SIRT1 and PGC-1 alpha. However, all cadmium-induced mitochondrial oxidative injuries were efficiently attenuated by melatonin pretreatment. Moreover, Sirtinol and SIRT1 siRNA each blocked the melatonin-mediated elevation in mitochondrial function by inhibiting SIRT1/ PGC-1 alpha signaling. Luzindole, a melatonin receptor antagonist, was found to partially block the ability of melatonin to promote SIRT1/ PGC-1 alpha signaling. In summary, our results indicate that SIRT1 plays an essential role in the ability of moderate melatonin to stimulate PGC-1 alpha and improve mitochondrial biogenesis and function at least partially through melatonin receptors in cadmium-induced hepatotoxicity.
Collapse
Affiliation(s)
- Pan Guo
- Department of occupational health, Third Military Medical University, Chongqing 400038, People's Republic of China
| | - Huifeng Pi
- Department of occupational health, Third Military Medical University, Chongqing 400038, People's Republic of China
| | - Shangcheng Xu
- Department of occupational health, Third Military Medical University, Chongqing 400038, People's Republic of China
| | - Lei Zhang
- Department of occupational health, Third Military Medical University, Chongqing 400038, People's Republic of China
| | - Yuming Li
- Institute of Hepatobiliary Surgery, XinQiao Hospital, Third Military Medical University, Chongqing 400037, People's Republic of China
| | - Min Li
- Department of occupational health, Third Military Medical University, Chongqing 400038, People's Republic of China
| | - Zhengwang Cao
- Department of occupational health, Third Military Medical University, Chongqing 400038, People's Republic of China
| | - Li Tian
- Department of occupational health, Third Military Medical University, Chongqing 400038, People's Republic of China
| | - Jia Xie
- Department of occupational health, Third Military Medical University, Chongqing 400038, People's Republic of China
| | - Renyan Li
- Department of occupational health, Third Military Medical University, Chongqing 400038, People's Republic of China
| | - Mindi He
- Department of occupational health, Third Military Medical University, Chongqing 400038, People's Republic of China
| | - Yonghui Lu
- Department of occupational health, Third Military Medical University, Chongqing 400038, People's Republic of China
| | - Chuan Liu
- Department of occupational health, Third Military Medical University, Chongqing 400038, People's Republic of China
| | - Weixia Duan
- Department of occupational health, Third Military Medical University, Chongqing 400038, People's Republic of China
| | - Zhengping Yu
- Department of occupational health, Third Military Medical University, Chongqing 400038, People's Republic of China
| | - Zhou Zhou
- Department of occupational health, Third Military Medical University, Chongqing 400038, People's Republic of China
| |
Collapse
|
154
|
Choi J, Chandrasekaran K, Demarest TG, Kristian T, Xu S, Vijaykumar K, Dsouza KG, Qi NR, Yarowsky PJ, Gallipoli R, Koch LG, Fiskum GM, Britton SL, Russell JW. Brain diabetic neurodegeneration segregates with low intrinsic aerobic capacity. Ann Clin Transl Neurol 2014; 1:589-604. [PMID: 25356430 PMCID: PMC4184561 DOI: 10.1002/acn3.86] [Citation(s) in RCA: 34] [Impact Index Per Article: 3.4] [Reference Citation Analysis] [Abstract] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/02/2013] [Revised: 06/16/2014] [Accepted: 06/20/2014] [Indexed: 12/28/2022] Open
Abstract
OBJECTIVES Diabetes leads to cognitive impairment and is associated with age-related neurodegenerative diseases including Alzheimer's disease (AD). Thus, understanding diabetes-induced alterations in brain function is important for developing early interventions for neurodegeneration. Low-capacity runner (LCR) rats are obese and manifest metabolic risk factors resembling human "impaired glucose tolerance" or metabolic syndrome. We examined hippocampal function in aged LCR rats compared to their high-capacity runner (HCR) rat counterparts. METHODS Hippocampal function was examined using proton magnetic resonance spectroscopy and imaging, unbiased stereology analysis, and a Y maze. Changes in the mitochondrial respiratory chain function and levels of hyperphosphorylated tau and mitochondrial transcriptional regulators were examined. RESULTS The levels of glutamate, myo-inositol, taurine, and choline-containing compounds were significantly increased in the aged LCR rats. We observed a significant loss of hippocampal neurons and impaired cognitive function in aged LCR rats. Respiratory chain function and activity were significantly decreased in the aged LCR rats. Hyperphosphorylated tau was accumulated within mitochondria and peroxisome proliferator-activated receptor-gamma coactivator 1α, the NAD(+)-dependent protein deacetylase sirtuin 1, and mitochondrial transcription factor A were downregulated in the aged LCR rat hippocampus. INTERPRETATION These data provide evidence of a neurodegenerative process in the hippocampus of aged LCR rats, consistent with those seen in aged-related dementing illnesses such as AD in humans. The metabolic and mitochondrial abnormalities observed in LCR rat hippocampus are similar to well-described mechanisms that lead to diabetic neuropathy and may provide an important link between cognitive and metabolic dysfunction.
Collapse
Affiliation(s)
- Joungil Choi
- Department of Neurology, University of MarylandBaltimore, Maryland, 21201
- Veterans Affairs Medical CenterBaltimore, Maryland, 21201
| | - Krish Chandrasekaran
- Department of Neurology, University of MarylandBaltimore, Maryland, 21201
- Veterans Affairs Medical CenterBaltimore, Maryland, 21201
| | - Tyler G Demarest
- Department of Anesthesiology, University of MarylandBaltimore, Maryland, 21201
| | - Tibor Kristian
- Veterans Affairs Medical CenterBaltimore, Maryland, 21201
- Department of Anesthesiology, University of MarylandBaltimore, Maryland, 21201
| | - Su Xu
- Department of Radiology, University of MarylandBaltimore, Maryland, 21201
| | - Kadambari Vijaykumar
- Department of Neurology, University of MarylandBaltimore, Maryland, 21201
- Veterans Affairs Medical CenterBaltimore, Maryland, 21201
| | - Kevin Geoffrey Dsouza
- Department of Neurology, University of MarylandBaltimore, Maryland, 21201
- Veterans Affairs Medical CenterBaltimore, Maryland, 21201
| | - Nathan R Qi
- Department of Internal Medicine, University of MichiganAnn Arbor, Michigan, 48109
| | - Paul J Yarowsky
- Department of Pharmacology, University of MarylandBaltimore, Maryland, 21201
| | - Rao Gallipoli
- Department of Radiology, University of MarylandBaltimore, Maryland, 21201
| | - Lauren G Koch
- Department of Anesthesiology, University of MichiganAnn Arbor, Michigan, 48109
| | - Gary M Fiskum
- Department of Anesthesiology, University of MarylandBaltimore, Maryland, 21201
| | - Steven L Britton
- Department of Anesthesiology, University of MichiganAnn Arbor, Michigan, 48109
| | - James W Russell
- Department of Neurology, University of MarylandBaltimore, Maryland, 21201
- Veterans Affairs Medical CenterBaltimore, Maryland, 21201
| |
Collapse
|