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Saito T, Tsuchishima M, Tsutsumi M, George J. Molecular pathogenesis of metabolic dysfunction-associated steatotic liver disease, steatohepatitis, hepatic fibrosis and liver cirrhosis. J Cell Mol Med 2024; 28:e18491. [PMID: 38894579 PMCID: PMC11187936 DOI: 10.1111/jcmm.18491] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/15/2024] [Revised: 05/24/2024] [Accepted: 05/30/2024] [Indexed: 06/21/2024] Open
Abstract
Metabolic dysfunction-associated steatotic liver disease (MASLD) is characterized by intense deposition of fat globules in the hepatic parenchyma that could potentially progress to liver cirrhosis and hepatocellular carcinoma. Here, we evaluated a rat model to study the molecular pathogenesis of the spectrum of MASLD and to screen therapeutic agents. SHRSP5/Dmcr rats were fed a high-fat and cholesterol (HFC) diet for a period of 12 weeks and evaluated for the development of steatosis (MASLD), steatohepatitis, fibrosis and cirrhosis. A group of animals were sacrificed at the end of the 4th, 6th, 8th and 12th weeks from the beginning of the experiment, along with the control rats that received normal diet. Blood and liver samples were collected for biochemical and histopathological evaluations. Immunohistochemical staining was performed for α-SMA and Collagen Type I. Histopathological examinations demonstrated steatosis at the 4th week, steatohepatitis with progressive fibrosis at the 6th week, advanced fibrosis with bridging at the 8th week and cirrhosis at the 12th week. Biochemical markers and staining for α-SMA and Collagen Type I demonstrated the progression of steatosis to steatohepatitis, hepatic fibrosis and liver cirrhosis in a stepwise manner. Control animals fed a normal diet did not show any biochemical or histopathological alterations. The results of the present study clearly demonstrated that the HFC diet-induced model of steatosis, steatohepatitis, hepatic fibrosis and cirrhosis is a feasible, quick and appropriate animal model to study the molecular pathogenesis of the spectrum of MASLD and to screen potent therapeutic agents.
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Affiliation(s)
- Takashi Saito
- Department of HepatologyKanazawa Medical UniversityUchinadaIshikawaJapan
| | | | - Mikihiro Tsutsumi
- Department of HepatologyKanazawa Medical UniversityUchinadaIshikawaJapan
- Center for Regenerative MedicineKanazawa Medical University HospitalUchinadaIshikawaJapan
| | - Joseph George
- Department of HepatologyKanazawa Medical UniversityUchinadaIshikawaJapan
- Center for Regenerative MedicineKanazawa Medical University HospitalUchinadaIshikawaJapan
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Yamagata M, Tsuchishima M, Saito T, Tsutsumi M, George J. Therapeutic implication of human placental extract to prevent liver cirrhosis in rats with metabolic dysfunction-associated steatohepatitis. Clin Sci (Lond) 2024; 138:327-349. [PMID: 38381799 DOI: 10.1042/cs20230533] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/19/2023] [Revised: 02/14/2024] [Accepted: 02/21/2024] [Indexed: 02/23/2024]
Abstract
Metabolic dysfunction-associated steatohepatitis (MASH) is always accompanied with hepatic fibrosis that could potentially progress to liver cirrhosis and hepatocellular carcinoma. Employing a rat model, we evaluated the role of human placental extract (HPE) to arrest the progression of hepatic fibrosis to cirrhosis in patients with MASH. SHRSP5/Dmcr rats were fed with a high-fat and high-cholesterol diet for 4 weeks and evaluated for the development of steatosis. The animals were divided into control and treated groups and received either saline or HPE (3.6 ml/kg body weight) subcutaneously thrice a week. A set of animals were killed at the end of 6th, 8th, and 12th weeks from the beginning of the experiment. Serum aspartate aminotransferase (AST), alanine aminotransferase (ALT), hepatic malondialdehyde (MDA), and glutathione content were measured. Immunohistochemical staining was performed for α-smooth muscle actin (α-SMA), 4-hydroxy-2-nonenal (4-HNE), collagen type I, and type III. Control rats depicted progression of liver fibrosis at 6 weeks, advanced fibrosis and bridging at 8 weeks, and cirrhosis at 12 weeks, which were significantly decreased in HPE-treated animals. Treatment with HPE maintained normal levels of MDA and glutathione in the liver. There was marked decrease in the staining intensity of α-SMA, 4-HNE, and collagen type I and type III in HPE treated rats compared with control animals. The results of the present study indicated that HPE treatment mediates immunotropic, anti-inflammatory, and antioxidant responses and attenuates hepatic fibrosis and early cirrhosis. HPE depicts therapeutic potential to arrest the progression of MASH towards cirrhosis.
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Affiliation(s)
- Mitsuyoshi Yamagata
- Department of Hepatology, Kanazawa Medical University, Uchinada, Ishikawa 920-0293, Japan
| | - Mutsumi Tsuchishima
- Department of Hepatology, Kanazawa Medical University, Uchinada, Ishikawa 920-0293, Japan
| | - Takashi Saito
- Department of Hepatology, Kanazawa Medical University, Uchinada, Ishikawa 920-0293, Japan
| | - Mikihiro Tsutsumi
- Department of Hepatology, Kanazawa Medical University, Uchinada, Ishikawa 920-0293, Japan
- Center for Regenerative Medicine, Kanazawa Medical University Hospital, Uchinada, Ishikawa 920-0293, Japan
| | - Joseph George
- Department of Hepatology, Kanazawa Medical University, Uchinada, Ishikawa 920-0293, Japan
- Center for Regenerative Medicine, Kanazawa Medical University Hospital, Uchinada, Ishikawa 920-0293, Japan
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Yamamoto S, Sato I, Fujii M, Kakimoto M, Honma K, Kirihara S, Nakayama H, Fukuoka T, Tamura S, Ueda M, Hirohata S, Watanabe S. Therapeutic effect of ouabagenin, a novel liver X receptor agonist, on atherosclerosis in nonalcoholic steatohepatitis in SHRSP5/Dmcr rat model. Can J Physiol Pharmacol 2023; 101:455-465. [PMID: 37224568 DOI: 10.1139/cjpp-2022-0532] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 05/26/2023]
Abstract
The liver X receptor (LXR) can enhance cholesterol transporters, which could remove excess cholesterol from foam cells in atheromas. LXR has two subtypes: LXRα, which aggravates hepatic lipid accumulation, and LXRβ, which does not. In 2018, ouabagenin (OBG) was reported as a potential LXRβ-specific agonist. We aimed to examine whether OBG specifically affects LXRβ in nonalcoholic steatohepatitis (NASH); it did not aggravate hepatic steatosis and can suppress the development of atherosclerosis. SHRSP5/Dmcr rats fed a high-fat and high-cholesterol diet were divided into four groups as follows: (I) L-NAME group, (II) L-NAME/OBG group, (III) OBG (-) group, and (IV) OBG (+) group. All groups' rats were intraperitoneally administered L-NAME. The L-NAME/OBG group's rats were intraperitoneally administered OBG and L-NAME simultaneously. After L-NAME administration, the OBG (+) group's rats were administered OBG, while the OBG (-) group's rats were not. Although all rats developed NASH, OBG did not exacerbate steatosis (L-NAME/OBG and OBG (+) groups). In addition, endothelial cells were protected in the L-NAME/OBG group and foam cells in the atheroma were reduced in the OBG (+) group. OBG is an LXRβ-specific agonist and has a potential therapeutic effect on atherosclerosis without developing lipid accumulation in the liver.
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Affiliation(s)
- Shusei Yamamoto
- Faculty of Health Sciences, Okayama University, 2-5-1 Shikata-cho, Kita-ku, Okayama-shi, Okayama 700-8558, Japan
- Department of Medical Technology, Graduate School of Health Sciences, Okayama University, 2-5-1 Shikata-cho, Kita-ku, Okayama-shi, Okayama 700-8558, Japan
| | - Ikumi Sato
- Faculty of Health Sciences, Okayama University, 2-5-1 Shikata-cho, Kita-ku, Okayama-shi, Okayama 700-8558, Japan
- Department of Medical Technology, Graduate School of Health Sciences, Okayama University, 2-5-1 Shikata-cho, Kita-ku, Okayama-shi, Okayama 700-8558, Japan
| | - Moe Fujii
- Department of Medical Technology, Graduate School of Health Sciences, Okayama University, 2-5-1 Shikata-cho, Kita-ku, Okayama-shi, Okayama 700-8558, Japan
- Department of Medical Technology, Ehime Prefectural University of Health Sciences, 543 Takoda, Tobe-cho, Iyo-gun, Ehime 791-2101, Japan
| | - Mai Kakimoto
- Department of Medical Technology, Graduate School of Health Sciences, Okayama University, 2-5-1 Shikata-cho, Kita-ku, Okayama-shi, Okayama 700-8558, Japan
| | - Koki Honma
- Department of Medical Technology, Graduate School of Health Sciences, Okayama University, 2-5-1 Shikata-cho, Kita-ku, Okayama-shi, Okayama 700-8558, Japan
| | - Sora Kirihara
- Department of Medical Technology, Graduate School of Health Sciences, Okayama University, 2-5-1 Shikata-cho, Kita-ku, Okayama-shi, Okayama 700-8558, Japan
| | - Hinako Nakayama
- Department of Medical Technology, Graduate School of Health Sciences, Okayama University, 2-5-1 Shikata-cho, Kita-ku, Okayama-shi, Okayama 700-8558, Japan
| | - Taketo Fukuoka
- Department of Medical Technology, Faculty of Health Sciences, Okayama University, 2-5-1 Shikata-cho, Kita-ku, Okayama-shi, Okayama 700-8558, Japan
| | - Satoru Tamura
- School of Pharmaceutical Sciences, Wakayama Medical University, 25-1 Shichibancho, Wakayama-shi, Wakayama 640-8156, Japan
| | - Minoru Ueda
- Department of Chemistry, Graduate School of Life Science, Tohoku University, 6-3 Aoba, Aramaki, Aoba-ku, Sendai-shi, Miyagi 980-8578, Japan
| | - Satoshi Hirohata
- Faculty of Health Sciences, Okayama University, 2-5-1 Shikata-cho, Kita-ku, Okayama-shi, Okayama 700-8558, Japan
| | - Shogo Watanabe
- Faculty of Health Sciences, Okayama University, 2-5-1 Shikata-cho, Kita-ku, Okayama-shi, Okayama 700-8558, Japan
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Honma K, Kirihara S, Nakayama H, Fukuoka T, Ohara T, Kitamori K, Sato I, Hirohata S, Fujii M, Yamamoto S, Ran S, Watanabe S. Selective autophagy associated with iron overload aggravates non-alcoholic steatohepatitis via ferroptosis. Exp Biol Med (Maywood) 2023; 248:1112-1123. [PMID: 37646078 PMCID: PMC10583757 DOI: 10.1177/15353702231191197] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/01/2023] [Accepted: 05/18/2023] [Indexed: 09/01/2023] Open
Abstract
Non-alcoholic steatohepatitis (NASH) is a progressive form of non-alcoholic fatty liver disease (NAFLD) that causes cirrhosis and hepatocellular carcinoma. Iron is an essential trace element in the body; however, excess iron can cause tissue damage and dysfunction. Iron overload is often observed in patients with NASH, and the amount of iron accumulated in the liver positively correlates with the histological severity of NASH. Ferroptosis, a novel form of iron-dependent cell death, is caused by the accumulation of lipid peroxidation and oxidative stress and is related to NASH. In addition, ferroptosis is closely related to autophagy, an intracellular self-degradation process. Although autophagy has many beneficial effects, it may also be harmful to the organism, for example, inducing ferroptosis. It is unclear whether iron overload aggravates NASH via autophagy. The aim of this research is to determine the mechanism by which iron overload induces ferroptosis via autophagy and aggravates NASH. Stroke-prone spontaneously hypertensive rats (SHRSP5/Dmcr) were divided into two groups and fed a high-fat and high-cholesterol (HFC) diet for eight weeks. Iron dextran was administered to the Fe group in addition to the HFC diet. Blood analysis, histological staining, calcineurin activity assay, quantitative reverse transcription polymerase chain reaction (RT-PCR), immunofluorescence staining, and electron microscopy were performed. The results showed that iron overload promoted autophagy via nuclear translocation of transcription factor EB (TFEB) and induced ferritinophagy, which is the autophagic degradation of ferritin. In addition, the HFC diet induced lipophagy, the autophagic degradation of lipid droplets. The Fe group also exhibited promoted ferroptosis and aggravated hepatic inflammation and fibrosis. In conclusion, iron overload accelerates ferritinophagy and lipophagy, aggravating NASH pathology via ferroptosis. These findings indicate the therapeutic potential of inhibiting autophagy and ferroptosis for treating NASH.
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Affiliation(s)
- Koki Honma
- Department of Medical Technology, Graduate School of Health Sciences, Okayama University, Okayama 700-8558, Japan
| | - Sora Kirihara
- Department of Medical Technology, Graduate School of Health Sciences, Okayama University, Okayama 700-8558, Japan
| | - Hinako Nakayama
- Department of Medical Technology, Graduate School of Health Sciences, Okayama University, Okayama 700-8558, Japan
| | - Taketo Fukuoka
- Department of Medical Technology, Graduate School of Health Sciences, Okayama University, Okayama 700-8558, Japan
| | - Toshiaki Ohara
- Department of Pathology and Experimental Medicine, Graduate School of Medicine, Dentistry and Pharmaceutical Science, Okayama University, Okayama 700-8558, Japan
| | - Kazuya Kitamori
- College of Human Life and Environment, Kinjo Gakuin University, Nagoya 463-8521, Japan
| | - Ikumi Sato
- Academic Field of Health Science, Okayama University, Okayama 700-8558, Japan
| | - Satoshi Hirohata
- Academic Field of Health Science, Okayama University, Okayama 700-8558, Japan
| | - Moe Fujii
- Department of Medical Technology, Ehime Prefectural University of Health Sciences, Ehime 791-2101, Japan
| | - Shusei Yamamoto
- Department of Medical Technology, Graduate School of Health Sciences, Okayama University, Okayama 700-8558, Japan
- Academic Field of Health Science, Okayama University, Okayama 700-8558, Japan
| | - Shang Ran
- HeiLongjiang Provincial Center for disease control and prevention, Harbin 150030, China
| | - Shogo Watanabe
- Academic Field of Health Science, Okayama University, Okayama 700-8558, Japan
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Liu SY, Huang CC, Yang YY, Huang SF, Lee TY, Li TH, Hou MC, Lin HC. Obeticholic acid treatment ameliorates the cardiac dysfunction in NASH mice. PLoS One 2022; 17:e0276717. [PMID: 36490253 PMCID: PMC9733885 DOI: 10.1371/journal.pone.0276717] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/13/2022] [Accepted: 10/11/2022] [Indexed: 12/13/2022] Open
Abstract
BACKGROUND Suppression of cardiac iinflammasome, which can be inhibited by Farnesoid X receptor (FXR) agonist, can ameliorate cardiac inflammation and fibrosis. Increased cardiac inflammasome decrease the abundance of regulatory T (Treg) cells and exacerbate cardiac dysfunction. Interaction between cardiomyocytes and Treg cells is involved in the development of nonalcoholic steatohepatitis (NASH)-related cardiac dysfunction. AIMS This study evaluates whether the FXR agonist obeticholic acid (OCA) treatment improves NASH-associated cardiac dysfunction. METHODS The in vivo and in vitro mechanisms and effects of two weeks of OCA treatment on inflammasome and Treg dysregulation-related cardiac dysfunction in NASH mice (NASH-OCA) at systemic, tissue and cellular levels were investigated. RESULTS The OCA treatment suppressed the serum and cardiac inflammasome levels, reduced the cardiac infiltrated CD3+ T cells, increased the cardiac Treg-represented anti-inflammatory cytokines (IL-10/IL-10R) and improved cardiac inflammation, fibrosis and function [decreased left ventricle (LV) mass and increased fractional shortening (FS)] in NASH-OCA mice. The percentages of OCA-decreased cardiac fibrosis and OCA-increased FS were positively correlated with the percentage of OCA-increased levels of cardiac FXR and IL-10/IL-10R. In the Treg cells from NASH-OCA mice spleen, in comparison with the Treg cells of the NASH group, higher intracellular FXR but lower inflammasome levels, and more proliferative/active and less apoptotic cells were observed. Incubation of H9c2 cardiomyoblasts with Treg-NASHcm [supernatant of Treg from NASH mice as condition medium (cm)], increased inflammasome levels, decreased the proliferative/active cells, suppressed the intracellular FXR, and downregulated differentiation/contraction marker. The Treg-NASHcm-induced hypocontractility of H9c2 can be attenuated by co-incubation with OCA, and the OCA-related effects were abolished by siIL-10R pretreatment. CONCLUSIONS Chronic FXR activation with OCA is a potential strategy for activating IL-10/IL-10R signalling, reversing cardiac regulatory T cell dysfunction, and improving inflammasome-mediated NASH-related cardiac dysfunction.
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Affiliation(s)
- Szu-Yu Liu
- Department of Medical Education, Clinical Innovation Center, Medical Innovation and Research Office, Taipei Veterans General Hospital, Taipei, Taiwan,Faculty of Medicine, School of Medicine, National Yang-Ming Chiao Tung University, Taipei, Taiwan
| | - Chia-Chang Huang
- Faculty of Medicine, School of Medicine, National Yang-Ming Chiao Tung University, Taipei, Taiwan,Faculty of Medicine, Institute of Clinical Medicine, School of Medicine, National Yang-Ming Chiao Tung University, Taipei, Taiwan
| | - Ying-Ying Yang
- Department of Medical Education, Clinical Innovation Center, Medical Innovation and Research Office, Taipei Veterans General Hospital, Taipei, Taiwan,Faculty of Medicine, School of Medicine, National Yang-Ming Chiao Tung University, Taipei, Taiwan,* E-mail: (Y-YY); (H-CL)
| | - Shiang-Fen Huang
- Faculty of Medicine, School of Medicine, National Yang-Ming Chiao Tung University, Taipei, Taiwan,Taipei Veterans General Hospital, Taipei, Taiwan
| | - Tzung-Yan Lee
- Graduate Institute of Traditional Chinese Medicine, Chang Guang Memorial Hospital, Linkou, Taiwan
| | - Tzu-Hao Li
- Faculty of Medicine, School of Medicine, National Yang-Ming Chiao Tung University, Taipei, Taiwan,Faculty of Medicine, Institute of Clinical Medicine, School of Medicine, National Yang-Ming Chiao Tung University, Taipei, Taiwan,Division of Allergy, Immunology, and Rheumatology, Department of Internal Medicine, Shin Kong Wu Ho-Su Memorial Foundation, Taipei, Taiwan
| | - Ming-Chih Hou
- Faculty of Medicine, School of Medicine, National Yang-Ming Chiao Tung University, Taipei, Taiwan,Taipei Veterans General Hospital, Taipei, Taiwan
| | - Han-Chieh Lin
- Taipei Veterans General Hospital, Taipei, Taiwan,* E-mail: (Y-YY); (H-CL)
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Sato I, Yamamoto S, Kakimoto M, Fujii M, Honma K, Kumazaki S, Matsui M, Nakayama H, Kirihara S, Ran S, Usui S, Shinohata R, Kitamori K, Hirohata S, Watanabe S. Suppression of nitric oxide synthase aggravates non-alcoholic steatohepatitis and atherosclerosis in SHRSP5/Dmcr rat via acceleration of abnormal lipid metabolism. Pharmacol Rep 2022; 74:669-683. [PMID: 35819592 DOI: 10.1007/s43440-022-00380-1] [Citation(s) in RCA: 3] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/12/2022] [Revised: 05/20/2022] [Accepted: 06/09/2022] [Indexed: 02/05/2023]
Abstract
BACKGROUND Non-alcoholic steatohepatitis (NASH) is a progressive subtype of non-alcoholic fatty liver disease (NAFLD) that is closely related to cardiovascular disease (CVD). Nitric oxide (NO) plays a critical role in the control of various biological processes. Dysfunction of the NO signaling pathway is associated with various diseases such as atherosclerosis, vascular inflammatory disease, and diabetes. Recently, it has been reported that NO is related to lipid and cholesterol metabolism. Chronic NO synthase (NOS) inhibition accelerates NAFLD by increasing hepatic lipid deposition. However, the detailed relationship between NO and abnormal lipid and cholesterol metabolism in NAFLD/NASH has not been completely explained. We aimed to determine the effects of NOS inhibition by N omega-nitro-L-arginine methyl ester hydrochloride (L-NAME), a NOS inhibitor, on NASH and CVD via lipid and cholesterol metabolism. METHODS Stroke-prone spontaneously hypertensive rats were fed a high-fat and high-cholesterol diet for 8 weeks and administered L-NAME for the last 2 weeks. Following blood and tissue sampling, biochemical analysis, histopathological staining, quantitative RT-PCR analysis, and western blotting were performed. RESULTS L-NAME markedly increased hepatic triglyceride (TG) and cholesterol levels by promoting TG synthesis and cholesterol absorption from the diet. L-NAME increased the mRNA levels of inflammatory markers and fibrotic areas in the liver. Cholesterol secretion from the liver was promoted in rats administered L-NAME, which increased serum cholesterol. L-NAME significantly increased the level of oxidative stress marker and lipid deposition in the arteries. CONCLUSIONS NOS inhibition simultaneously aggravates NASH and atherosclerosis via hepatic lipid and cholesterol metabolism.
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Affiliation(s)
- Ikumi Sato
- Department of Medical Technology, Graduate School of Health Sciences, Okayama University, 2-5-1, Shikata-cho, Kita-ku, Okayama-shi, Okayama, 700-8558, Japan
| | - Shusei Yamamoto
- Department of Medical Technology, Graduate School of Health Sciences, Okayama University, 2-5-1, Shikata-cho, Kita-ku, Okayama-shi, Okayama, 700-8558, Japan
- Academic Field of Health Science, Okayama University, 2-5-1, Shikata-cho, Kita-ku, Okayama-shi, Okayama, 700-8558, Japan
| | - Mai Kakimoto
- Department of Medical Technology, Graduate School of Health Sciences, Okayama University, 2-5-1, Shikata-cho, Kita-ku, Okayama-shi, Okayama, 700-8558, Japan
| | - Moe Fujii
- Department of Medical Technology, Graduate School of Health Sciences, Okayama University, 2-5-1, Shikata-cho, Kita-ku, Okayama-shi, Okayama, 700-8558, Japan
| | - Koki Honma
- Department of Medical Technology, Graduate School of Health Sciences, Okayama University, 2-5-1, Shikata-cho, Kita-ku, Okayama-shi, Okayama, 700-8558, Japan
| | - Shota Kumazaki
- Department of Medical Technology, Graduate School of Health Sciences, Okayama University, 2-5-1, Shikata-cho, Kita-ku, Okayama-shi, Okayama, 700-8558, Japan
| | - Mami Matsui
- Department of Medical Technology, Faculty of Health Sciences, Okayama University, 2-5-1, Shikata-cho, Kita-ku, Okayama-shi, Okayama, 700-8558, Japan
| | - Hinako Nakayama
- Department of Medical Technology, Graduate School of Health Sciences, Okayama University, 2-5-1, Shikata-cho, Kita-ku, Okayama-shi, Okayama, 700-8558, Japan
| | - Sora Kirihara
- Department of Medical Technology, Graduate School of Health Sciences, Okayama University, 2-5-1, Shikata-cho, Kita-ku, Okayama-shi, Okayama, 700-8558, Japan
| | - Shang Ran
- Department of Medical Technology, Graduate School of Health Sciences, Okayama University, 2-5-1, Shikata-cho, Kita-ku, Okayama-shi, Okayama, 700-8558, Japan
| | - Shinichi Usui
- Department of Pathobiological Science and Technology, School of Health Science, Faculty of Medicine, Tottori University, 86, Nishi-machi, Yonago-shi, Tottori, 683-8503, Japan
| | - Ryoko Shinohata
- Academic Field of Health Science, Okayama University, 2-5-1, Shikata-cho, Kita-ku, Okayama-shi, Okayama, 700-8558, Japan
| | - Kazuya Kitamori
- Collage of Human Life and Environment, Kinjo Gakuin University, 2-1723, Omori, Moriyama-ku, Nagoya-shi, Aichi, 463-8521, Japan
| | - Satoshi Hirohata
- Academic Field of Health Science, Okayama University, 2-5-1, Shikata-cho, Kita-ku, Okayama-shi, Okayama, 700-8558, Japan
| | - Shogo Watanabe
- Academic Field of Health Science, Okayama University, 2-5-1, Shikata-cho, Kita-ku, Okayama-shi, Okayama, 700-8558, Japan.
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Beneficial Effects of Dietary Nitrite on a Model of Nonalcoholic Steatohepatitis Induced by High-Fat/High-Cholesterol Diets in SHRSP5/Dmcr Rats: A Preliminary Study. Int J Mol Sci 2022; 23:ijms23062931. [PMID: 35328352 PMCID: PMC8951310 DOI: 10.3390/ijms23062931] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/05/2022] [Revised: 03/06/2022] [Accepted: 03/07/2022] [Indexed: 12/10/2022] Open
Abstract
Nonalcoholic steatohepatitis (NASH) is a chronic liver disease that leads to liver cirrhosis and hepatocellular carcinoma. Endothelial dysfunction caused by hepatic lipotoxicity is an underlying NASH pathology observed in the liver and the cardiovascular system. Here, we evaluated the effect of dietary nitrite on a rat NASH model. Stroke-prone, spontaneously hypertensive 5/Dmcr rats were fed a high-fat/high-cholesterol diet to develop the NASH model, with nitrite or captopril (100 mg/L, each) supplementation in drinking water for 8 weeks. The effects of nitrite and captopril were evaluated using immunohistochemical analyses of the liver and heart tissues. Dietary nitrite suppressed liver fibrosis in the rats by reducing oxidative stress, as measured using the protein levels of nicotinamide adenine dinucleotide phosphate oxidase components and inflammatory cell accumulation in the liver. Nitrite lowered the blood pressure in hypertensive NASH rats and suppressed left ventricular chamber enlargement. Similar therapeutic effects were observed in a captopril-treated rat NASH model, suggesting the possibility of a common signaling pathway through which nitrite and captopril improve NASH pathology. In conclusion, dietary nitrite attenuates the development of NASH with cardiovascular involvement in rats and provides an alternative NASH therapeutic strategy.
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Kozawa J, Shimomura I. Ectopic Fat Accumulation in Pancreas and Heart. J Clin Med 2021; 10:1326. [PMID: 33806978 PMCID: PMC8004936 DOI: 10.3390/jcm10061326] [Citation(s) in RCA: 13] [Impact Index Per Article: 4.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/09/2021] [Revised: 03/14/2021] [Accepted: 03/22/2021] [Indexed: 12/15/2022] Open
Abstract
Ectopic fat is found in liver, muscle, and kidney and is known to accumulate as visceral fat. In recent years, ectopic fat has also been observed in the pancreas, and it has been said that pancreatic fat accumulation is related to the pathophysiology of diabetes and the onset of diabetes, but the relationship has not yet been determined. In the heart, epicardium fat is another ectopic fat, which is associated with the development of coronary artery disease. Ectopic fat is also observed in the myocardium, and diabetic patients have more fat accumulation in this tissue than nondiabetic patients. Myocardium fat is reported to be related to diastolic cardiac dysfunction, which is one of the characteristics of the complications observed in diabetic patients. We recently reported that ectopic fat accumulation was observed in coronary arteries of a type 2 diabetic patient with intractable coronary artery disease, and coronary artery is attracting attention as a new tissue of ectopic fat accumulation. Here, we summarize the latest findings focusing on the relationship between ectopic fat accumulation in these organs and diabetic pathophysiology and complications, then describe the possibility of future treatments targeting these ectopic fat accumulations.
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Affiliation(s)
- Junji Kozawa
- Department of Metabolic Medicine, Graduate School of Medicine, Osaka University, Suita 565-0871, Japan;
- Department of Diabetes Care Medicine, Graduate School of Medicine, Osaka University, Suita 565-0871, Japan
| | - Iichiro Shimomura
- Department of Metabolic Medicine, Graduate School of Medicine, Osaka University, Suita 565-0871, Japan;
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Yamamoto S, Sato I, Fukuhama N, Akiyama N, Sakai M, Kumazaki S, Ran S, Hirohata S, Kitamori K, Yamori Y, Watanabe S. Bile acids aggravate nonalcoholic steatohepatitis and cardiovascular disease in SHRSP5/Dmcr rat model. Exp Mol Pathol 2020; 114:104437. [PMID: 32246926 DOI: 10.1016/j.yexmp.2020.104437] [Citation(s) in RCA: 6] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/06/2020] [Revised: 03/27/2020] [Accepted: 03/31/2020] [Indexed: 02/06/2023]
Abstract
BACKGROUND AND AIMS Nonalcoholic steatohepatitis (NASH) is linked to an increased risk of cardiovascular disease, regardless of the risk factors in metabolic syndrome. However, the intermediary factors between NASH and cardiovascular disease are still unknown. A previous study revealed that serum and hepatic bile acid (BA) levels are increased in some NASH patients. We aimed to examine whether NASH and cardiovascular disease were aggravated by BA using an animal model. METHOD AND RESULTS From 10 to 18 weeks of age, SHRSP5/Dmcr rats divided into 3 groups were fed 3 types of high-fat and high-cholesterol (HFC) diets which were changed in the cholic acid (CA) concentration (0%, 2%, or 4%). The nitro oxide synthase inhibition (L-NAME) was administered intraperitoneally from 16 to 18 weeks of age. The 4% CA groups showed the worst LV dysfunction and myocardial fibrosis, and demonstrated severe hepatic fibrosis and lipid depositions. In addition, a large amount of lipid accumulation was observed in the aortas of the 4% CA group, and NFκB and VCAM-1 gene expression levels were increased. These findings were not seen in the 0% CA group. CONCLUSION In the SHRSP5/Dmcr rat model, NASH and cardiovascular disease were aggravated with increasing BAs concentrations in an HFC diet.
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Affiliation(s)
- Shusei Yamamoto
- Department of Medical Technology, Graduate School of Health Sciences, Okayama University, 2-5-1, Shikata-cho, Kita-ku, Okayama-shi, Okayama 700-8558, Japan
| | - Ikumi Sato
- Department of Medical Technology, Graduate School of Health Sciences, Okayama University, 2-5-1, Shikata-cho, Kita-ku, Okayama-shi, Okayama 700-8558, Japan
| | - Natsuki Fukuhama
- Department of Medical Technology, Faculty of Health Sciences, Okayama University, 2-5-1, Shikata-cho, Kita-ku, Okayama-shi, Okayama 700-8558, Japan
| | - Natsumi Akiyama
- Department of Medical Technology, Faculty of Health Sciences, Okayama University, 2-5-1, Shikata-cho, Kita-ku, Okayama-shi, Okayama 700-8558, Japan
| | - Miku Sakai
- Department of Medical Technology, Faculty of Health Sciences, Okayama University, 2-5-1, Shikata-cho, Kita-ku, Okayama-shi, Okayama 700-8558, Japan
| | - Shota Kumazaki
- Department of Medical Technology, Graduate School of Health Sciences, Okayama University, 2-5-1, Shikata-cho, Kita-ku, Okayama-shi, Okayama 700-8558, Japan
| | - Shang Ran
- Advanced Institute for Medical Sciences, Dalian Medical University, No.9 West Section Lvshun South Road, Dalian, Liaoning Province 116-044, China
| | - Satoshi Hirohata
- Department of Medical Technology, Graduate School of Health Sciences, Okayama University, 2-5-1, Shikata-cho, Kita-ku, Okayama-shi, Okayama 700-8558, Japan
| | - Kazuya Kitamori
- College of Human Life and Environment, Kinjo Gakuin University, 2-1723, Omori, Moriyama-ku, Nagoya-shi, Aichi 463-8521, Japan
| | - Yukio Yamori
- Institute for World Health Development, Mukogawa Women's University, 4-16, Edagawa-cho, Nishinomiya-shi, Hyogo 663-8143, Japan
| | - Shogo Watanabe
- Department of Medical Technology, Graduate School of Health Sciences, Okayama University, 2-5-1, Shikata-cho, Kita-ku, Okayama-shi, Okayama 700-8558, Japan.
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Bashkatova V, Philippu A. Role of nitric oxide in psychostimulant-induced neurotoxicity. AIMS Neurosci 2019; 6:191-203. [PMID: 32341976 PMCID: PMC7179361 DOI: 10.3934/neuroscience.2019.3.191] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/21/2019] [Accepted: 08/27/2019] [Indexed: 12/28/2022] Open
Abstract
In recent decades, consumption of psychostimulants has been significantly increased all over the world, while exact mechanisms of neurochemical effects of psychomotor stimulants remained unclear. It is assumed that the neuronal messenger nitric oxide (NO) may be involved in mechanisms of neurotoxicity evoked by psychomotor stimulants. However, possible participation of NO in various pathological states is supported mainly by indirect evidence because of its short half-life in tissues. Aim of this review is to describe the involvement of NO and the contribution of lipid peroxidation (LPO) and acetylcholine (ACH) release in neurotoxic effects of psychostimulant drugs. NO was directly determined in brain structures by electron paramagnetic resonance (EPR). Both NO generation and LPO products as well as release of ACH were increased in brain structures following four injections of amphetamine (AMPH). Pretreatment of rats with the non-selective inhibitor of NO-synthase (NOS) N-nitro-L-arginine or the neuronal NOS inhibitor 7-nitroindazole significantly reduced increase of NO generation as well as the rise of ACH release induced by AMPH. Both NOS inhibitors injected prior to AMPH had no effect on enhanced levels of LPO products. Administration of the noncompetitive NMDA receptor antagonist dizocilpine abolished increase of both NO content and concentration of LPO products induced by of the psychostimulant drug. Dizocilpine also eliminated the influence of AMPH on the ACH release. Moreover, the neurochemical and neurotoxic effects of the psychostimulant drug sydnocarb were compared with those of AMPH. Single injection of AMPH showed a more pronounced increase in NO and TBARS levels than after an equimolar concentration of sydnocarb. The findings demonstrate the crucial role of NO in the development of neurotoxicity elicited by psychostimulants and underline the key role of NOS in AMPH-induced neurotoxicity.
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Affiliation(s)
- Valentina Bashkatova
- Laboratory of physiology of reinforcement, P.K. Anokhin Institute of Normal Physiology, Moscow, Russia
| | - Athineos Philippu
- Department of Pharmacology and Toxicology, University of Innsbruck, Austria
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11
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Ohtsuki T, Shinaoka A, Kumagishi-Shinaoka K, Asano K, Hatipoglu OF, Inagaki J, Takahashi K, Oohashi T, Nishida K, Naruse K, Hirohata S. Mechanical strain attenuates cytokine-induced ADAMTS9 expression via transient receptor potential vanilloid type 1. Exp Cell Res 2019; 383:111556. [PMID: 31415758 DOI: 10.1016/j.yexcr.2019.111556] [Citation(s) in RCA: 13] [Impact Index Per Article: 2.6] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/17/2019] [Revised: 08/07/2019] [Accepted: 08/10/2019] [Indexed: 12/27/2022]
Abstract
The synovial fluids of patients with osteoarthritis (OA) contain elevated levels of inflammatory cytokines, which induce the expression of a disintegrin and metalloproteinase with thrombospondin motifs (ADAMTS) and of the matrix metalloproteinase (MMP) in chondrocytes. Mechanical strain has varying effects on organisms depending on the strength, cycle, and duration of the stressor; however, it is unclear under inflammatory stimulation how mechanical strain act on. Here, we show that mechanical strain attenuates inflammatory cytokine-induced expression of matrix-degrading enzymes. Cyclic tensile strain (CTS), as a mechanical stressor, attenuated interleukin (IL)-1β and tumor necrosis factor (TNF)-α-induced mRNA expression of ADAMTS4, ADAMTS9, and MMP-13 in normal chondrocytes (NHAC-kn) and in a chondrocytic cell line (OUMS-27). This effect was abolished by treating cells with mechano-gated channel inhibitors, such as gadolinium, transient receptor potential (TRP) family inhibitor, ruthenium red, and with pharmacological and small interfering RNA-mediated TRPV1 inhibition. Furthermore, nuclear factor κB (NF-κB) translocation from the cytoplasm to the nucleus resulting from cytokine stimulation was also abolished by CTS. These findings suggest that mechanosensors such as the TRPV protein are potential therapeutic targets in treating OA.
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Affiliation(s)
- Takashi Ohtsuki
- Department of Medical Technology, Graduate School of Health Sciences, Japan
| | | | | | - Keiichi Asano
- Department of Molecular Biology and Biochemistry, Japan
| | | | | | | | | | - Keiichiro Nishida
- Department of Orthopaedic Surgery, Okayama University Graduate School of Medicine, Dentistry and Pharmaceutical Sciences, 2-5-1, Shikata-cho, Okayama, Japan
| | | | - Satoshi Hirohata
- Department of Medical Technology, Graduate School of Health Sciences, Japan.
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12
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Watanabe S, Kumazaki S, Yamamoto S, Sato I, Kitamori K, Mori M, Yamori Y, Hirohata S. Non-alcoholic steatohepatitis aggravates nitric oxide synthase inhibition-induced arteriosclerosis in SHRSP5/Dmcr rat model. Int J Exp Pathol 2019; 99:282-294. [PMID: 30680827 DOI: 10.1111/iep.12301] [Citation(s) in RCA: 7] [Impact Index Per Article: 1.4] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/15/2018] [Revised: 11/29/2018] [Accepted: 12/09/2018] [Indexed: 12/19/2022] Open
Abstract
Non-alcoholic steatohepatitis (NASH) is linked to increased cardiovascular risk, independent of the broad spectrum of metabolic syndrome risk factors. Stroke-prone (SP) spontaneously hypertensive rats (SHRSP5/Dmcr) fed a high-fat and high-cholesterol (HFC) diet developed hepatic lesions similar to those in human NASH pathology. These rats simultaneously developed lipid deposits in the mesenteric arteries, cardiac fibrosis, endothelial dysfunction and left ventricle (LV) diastolic dysfunction. However, the intermediary factors between NASH and cardiovascular disease are still unknown. We investigated whether NASH aggravates nitric oxide (NO) synthase inhibition-induced arteriosclerosis in SHRSP5/Dmcr rats. Wistar Kyoto and SHRSP5/Dmcr rats were divided into 4 groups of 5 and fed the stroke-prone (SP) or HFC diets for 8 weeks. To induce NO synthase inhibition, Nω -nitro-L-arginine methyl ester hydrochloride (L-NAME) mixed with drinking water was administered in the final 2 weeks. The NASH+L-NAME group demonstrated the following characteristics related to arteriosclerosis and myocardial ischaemia: (a) LV systolic dysfunction with asynergy, (b) replacement fibrosis caused by the shedding of cardiomyocytes and (c) arterial lipid deposition and coronary occlusion secondary to endothelial dysfunction. These characteristics were not observed in the NASH or non-NASH+L-NAME groups. The SHRSP5/Dmcr rat model demonstrates that NASH significantly aggravates cardiovascular risk.
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Affiliation(s)
- Shogo Watanabe
- Department of Medical Technology, Graduate School of Health Sciences, Okayama University, Okayama, Japan
| | - Shota Kumazaki
- Department of Medical Technology, Graduate School of Health Sciences, Okayama University, Okayama, Japan
| | - Shusei Yamamoto
- Department of Medical Technology, Graduate School of Health Sciences, Okayama University, Okayama, Japan
| | - Ikumi Sato
- Department of Medical Technology, Graduate School of Health Sciences, Okayama University, Okayama, Japan
| | - Kazuya Kitamori
- College of Human Life and Environment, Kinjo Gakuin University, Nagoya, Japan
| | - Mari Mori
- Department of Health Management, School of Health Studies, Tokai University, Kanagawa, Japan
| | - Yukio Yamori
- Institute for World Health Development, Mukogawa Women's University, Hyogo, Japan
| | - Satoshi Hirohata
- Department of Medical Technology, Graduate School of Health Sciences, Okayama University, Okayama, Japan
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