1
|
Yamagishi H, Kirai N, Morita A, Kashihara T, Nakahara T. Role of monocarboxylate transporters in AMPK-mediated protection against excitotoxic injury in the rat retina. Eur J Pharmacol 2024; 970:176510. [PMID: 38493917 DOI: 10.1016/j.ejphar.2024.176510] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/15/2023] [Revised: 03/04/2024] [Accepted: 03/14/2024] [Indexed: 03/19/2024]
Abstract
Activation of adenosine monophosphate (AMP)-activated protein kinase (AMPK) pathway protects against N-methyl-D-aspartic acid (NMDA)-induced excitotoxic retinal injury. AMPK activation enhances fatty acid metabolism and ketone body synthesis. Ketone bodies are transported into neurons by monocarboxylate transporters (MCTs) and exert neuroprotective effects. In this study, we examined the distribution and expression levels of MCT1 and MCT2 in the retina and analyzed the effects of pharmacological inhibition of MCTs on the protective effects of metformin and 5-aminoimidazole-4-carboxamide (AICAR), activators of AMPK, against NMDA-induced retinal injury in rats. MCT1 was expressed in the blood vessels, processes of astrocytes and Müller cells, and inner segments of photoreceptors in the rat retina, whereas MCT2 was expressed in neuronal cells in the ganglion cell layer (GCL) and in astrocyte processes. The expression levels of MCT2, but not MCT1, decreased one day after intravitreal injection of NMDA (200 nmol). Intravitreal injection of NMDA decreased the number of cells in the GCL compared to the vehicle seven days after injection. Simultaneous injection of metformin (20 nmol) or AICAR (50 nmol) with NMDA attenuated NMDA-induced cell loss in the GCL, and these protective effects were attenuated by AR-C155858 (1 pmol), an inhibitor of MCTs. AR-C155858 alone had no significant effect on the retinal structure. These results suggest that AMPK-activating compounds protect against NMDA-induced excitotoxic retinal injury via mechanisms involving MCTs in rats. NMDA-induced neurotoxicity may be associated with retinal neurodegenerative changes in glaucoma and diabetic retinopathy. Therefore, AMPK-activating compounds may be effective in managing these retinal diseases.
Collapse
Affiliation(s)
- Honoka Yamagishi
- Department of Molecular Pharmacology, Kitasato University School of Pharmaceutical Sciences, 5-9-1 Shirokane, Minato-ku, Tokyo, 108-8641, Japan
| | - Nozomu Kirai
- Department of Molecular Pharmacology, Kitasato University School of Pharmaceutical Sciences, 5-9-1 Shirokane, Minato-ku, Tokyo, 108-8641, Japan
| | - Akane Morita
- Department of Molecular Pharmacology, Kitasato University School of Pharmaceutical Sciences, 5-9-1 Shirokane, Minato-ku, Tokyo, 108-8641, Japan
| | - Toshihide Kashihara
- Department of Molecular Pharmacology, Kitasato University School of Pharmaceutical Sciences, 5-9-1 Shirokane, Minato-ku, Tokyo, 108-8641, Japan
| | - Tsutomu Nakahara
- Department of Molecular Pharmacology, Kitasato University School of Pharmaceutical Sciences, 5-9-1 Shirokane, Minato-ku, Tokyo, 108-8641, Japan.
| |
Collapse
|
2
|
Kashihara T, Sadoshima J. Regulation of myocardial glucose metabolism by YAP/TAZ signaling. J Cardiol 2024; 83:323-329. [PMID: 38266816 DOI: 10.1016/j.jjcc.2024.01.002] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 12/24/2023] [Accepted: 01/12/2024] [Indexed: 01/26/2024]
Abstract
The heart utilizes glucose and its metabolites as both energy sources and building blocks for cardiac growth and survival under both physiological and pathophysiological conditions. YAP/TAZ, transcriptional co-activators of the Hippo pathway, are key regulators of cell proliferation, survival, and metabolism in many cell types. Increasing lines of evidence suggest that the Hippo-YAP/TAZ signaling pathway is involved in the regulation of both physiological and pathophysiological processes in the heart. In particular, YAP/TAZ play a critical role in mediating aerobic glycolysis, the Warburg effect, in cardiomyocytes. Here, we summarize what is currently known about YAP/TAZ signaling in the heart by focusing on the regulation of glucose metabolism and its functional significance.
Collapse
Affiliation(s)
- Toshihide Kashihara
- Department of Molecular Pharmacology, Kitasato University School of Pharmaceutical Sciences, Tokyo, Japan
| | - Junichi Sadoshima
- Department of Cell Biology and Molecular Medicine, Rutgers New Jersey Medical School, Newark, NJ, USA.
| |
Collapse
|
3
|
Mori A, Ezawa Y, Asano D, Kanamori T, Morita A, Kashihara T, Sakamoto K, Nakahara T. Resveratrol dilates arterioles and protects against N-methyl-d-aspartic acid-induced excitotoxicity in the rat retina. Neurosci Lett 2023; 793:136999. [PMID: 36470506 DOI: 10.1016/j.neulet.2022.136999] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/15/2022] [Revised: 11/24/2022] [Accepted: 11/29/2022] [Indexed: 12/12/2022]
Abstract
Resveratrol, a natural polyphenolic compound, reportedly possesses numerous biological activities, including anti-inflammatory and antioxidant effects. In the current study, we examined (1) the dilator effects of resveratrol on retinal arterioles, (2) the protective effects of resveratrol against excitotoxic retinal injury, and (3) whether these effects are mediated by the AMP-activated kinase (AMPK)-dependent pathway in rats. Male Wistar rats (7 to 10 weeks old) were used in this study. The diameters of the retinal arterioles, mean arterial pressure, and heart rate were measured in vivo. The retinal injury was assessed by histological examination. Intravenous injection of resveratrol (3 mg/kg) increased the diameter of the retinal arterioles without affecting the mean arterial pressure and heart rate. The AMPK inhibitor, compound C (5 mg/kg, intravenously), significantly attenuated the retinal vasodilator response to resveratrol. Seven days after intravitreal injection of N-methyl-d-aspartic acid (NMDA; 25, 50, and 100 nmol/eye), the number of cells located in the ganglion cell layer (GCL) was reduced, along with thinning of the inner plexiform layer. Intravitreal resveratrol injection (100 nmol/eye) reduced the NMDA (25 and 50 nmol/eye)-induced cell loss in the GCL. The neuroprotective effect of resveratrol was significantly but not completely reversed by compound C (10 nmol/eye). These results suggest that resveratrol dilates retinal arterioles and protects against NMDA-induced retinal neurodegeneration via an AMPK-dependent pathway in rats. Resveratrol may have the potential to slow the onset and progression of diseases associated with retinal ischemia by improving impaired retinal circulation and protecting retinal neuronal cells.
Collapse
Affiliation(s)
- Asami Mori
- Department of Molecular Pharmacology, Kitasato University School of Pharmaceutical Sciences, 5-9-1 Shirokane, Minato-ku, Tokyo 108-8641, Japan
| | - Yuna Ezawa
- Department of Molecular Pharmacology, Kitasato University School of Pharmaceutical Sciences, 5-9-1 Shirokane, Minato-ku, Tokyo 108-8641, Japan
| | - Daiki Asano
- Department of Molecular Pharmacology, Kitasato University School of Pharmaceutical Sciences, 5-9-1 Shirokane, Minato-ku, Tokyo 108-8641, Japan
| | - Toshiki Kanamori
- Department of Molecular Pharmacology, Kitasato University School of Pharmaceutical Sciences, 5-9-1 Shirokane, Minato-ku, Tokyo 108-8641, Japan
| | - Akane Morita
- Department of Molecular Pharmacology, Kitasato University School of Pharmaceutical Sciences, 5-9-1 Shirokane, Minato-ku, Tokyo 108-8641, Japan
| | - Toshihide Kashihara
- Department of Molecular Pharmacology, Kitasato University School of Pharmaceutical Sciences, 5-9-1 Shirokane, Minato-ku, Tokyo 108-8641, Japan
| | - Kenji Sakamoto
- Department of Molecular Pharmacology, Kitasato University School of Pharmaceutical Sciences, 5-9-1 Shirokane, Minato-ku, Tokyo 108-8641, Japan
| | - Tsutomu Nakahara
- Department of Molecular Pharmacology, Kitasato University School of Pharmaceutical Sciences, 5-9-1 Shirokane, Minato-ku, Tokyo 108-8641, Japan.
| |
Collapse
|
4
|
Mikuni H, Watanabe G, Kumagai S, Yamamoto S, Sawada R, Yokoyama K, Honma Y, Sekine S, Kashihara T, Ishiyama K, Oguma J, Igaki H, Saruta M, Daiko H, Koyama S, Nishikawa H, Kato K. 1240P Activation status of CD8+ T and Treg cells in the tumor microenvironment potentially predicts the clinical efficacy of nivolumab in advanced esophageal squamous cell carcinoma. Ann Oncol 2022. [DOI: 10.1016/j.annonc.2022.07.1358] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022] Open
|
5
|
Kashihara T, Mukai R, Oka SI, Zhai P, Nakada Y, Yang Z, Mizushima W, Nakahara T, Warren JS, Abdellatif M, Sadoshima J. YAP mediates compensatory cardiac hypertrophy through aerobic glycolysis in response to pressure overload. J Clin Invest 2022; 132:150595. [PMID: 35133975 PMCID: PMC8920343 DOI: 10.1172/jci150595] [Citation(s) in RCA: 38] [Impact Index Per Article: 19.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/16/2021] [Accepted: 02/03/2022] [Indexed: 11/17/2022] Open
Abstract
The heart utilizes multiple adaptive mechanisms to maintain pump function. Compensatory cardiac hypertrophy reduces wall stress and oxygen consumption, thereby protecting the heart against acute blood pressure elevation. The nuclear effector of the Hippo pathway, Yes-associated protein 1 (YAP), is activated and mediates compensatory cardiac hypertrophy in response to acute pressure overload (PO). In this study, YAP promoted glycolysis by upregulating glucose transporter 1 (GLUT1), which in turn caused accumulation of intermediates and metabolites of the glycolytic, auxiliary, and anaplerotic pathways during acute PO. Cardiac hypertrophy was inhibited and heart failure was exacerbated in mice with YAP haploinsufficiency in the presence of acute PO. However, normalization of GLUT1 rescued the detrimental phenotype. PO induced the accumulation of glycolytic metabolites, including l-serine, l-aspartate, and malate, in a YAP-dependent manner, thereby promoting cardiac hypertrophy. YAP upregulated the GLUT1 gene through interaction with TEA domain family member 1 (TEAD1) and HIF-1α in cardiomyocytes. Thus, YAP induces compensatory cardiac hypertrophy through activation of the Warburg effect.
Collapse
Affiliation(s)
- Toshihide Kashihara
- Department of Cell Biology and Molecular Medicine, Rutgers New Jersey Medical School, Newark, New Jersey, USA.,Department of Molecular Pharmacology, Kitasato University School of Pharmaceutical Sciences, Tokyo, Japan
| | - Risa Mukai
- Department of Cell Biology and Molecular Medicine, Rutgers New Jersey Medical School, Newark, New Jersey, USA
| | - Shin-Ichi Oka
- Department of Cell Biology and Molecular Medicine, Rutgers New Jersey Medical School, Newark, New Jersey, USA
| | - Peiyong Zhai
- Department of Cell Biology and Molecular Medicine, Rutgers New Jersey Medical School, Newark, New Jersey, USA
| | - Yasuki Nakada
- Department of Cell Biology and Molecular Medicine, Rutgers New Jersey Medical School, Newark, New Jersey, USA
| | - Zhi Yang
- Department of Cell Biology and Molecular Medicine, Rutgers New Jersey Medical School, Newark, New Jersey, USA
| | - Wataru Mizushima
- Department of Cell Biology and Molecular Medicine, Rutgers New Jersey Medical School, Newark, New Jersey, USA
| | - Tsutomu Nakahara
- Department of Molecular Pharmacology, Kitasato University School of Pharmaceutical Sciences, Tokyo, Japan
| | - Junco S Warren
- Fralin Biomedical Research Institute, Virginia Tech Carilion, Roanoke, Virginia, USA
| | - Maha Abdellatif
- Department of Cell Biology and Molecular Medicine, Rutgers New Jersey Medical School, Newark, New Jersey, USA
| | - Junichi Sadoshima
- Department of Cell Biology and Molecular Medicine, Rutgers New Jersey Medical School, Newark, New Jersey, USA
| |
Collapse
|
6
|
Inazumi H, Kuwahara K, Nakagawa Y, Kuwabara Y, Numaga-Tomita T, Kashihara T, Nakada T, Kurebayashi N, Oya M, Nonaka M, Sugihara M, Kinoshita H, Moriuchi K, Yanagisawa H, Nishikimi T, Motoki H, Yamada M, Morimoto S, Otsu K, Mortensen RM, Nakao K, Kimura T. NRSF- GNAO1 Pathway Contributes to the Regulation of Cardiac Ca 2+ Homeostasis. Circ Res 2022; 130:234-248. [PMID: 34875852 DOI: 10.1161/circresaha.121.318898] [Citation(s) in RCA: 3] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Indexed: 12/24/2022]
Abstract
BACKGROUND During the development of heart failure, a fetal cardiac gene program is reactivated and accelerates pathological cardiac remodeling. We previously reported that a transcriptional repressor, NRSF (neuron restrictive silencer factor), suppresses the fetal cardiac gene program, thereby maintaining cardiac integrity. The underlying molecular mechanisms remain to be determined, however. METHODS We aim to elucidate molecular mechanisms by which NRSF maintains normal cardiac function. We generated cardiac-specific NRSF knockout mice and analyzed cardiac gene expression profiles in those mice and mice cardiac-specifically expressing a dominant-negative NRSF mutant. RESULTS We found that cardiac expression of Gαo, an inhibitory G protein encoded in humans by GNAO1, is transcriptionally regulated by NRSF and is increased in the ventricles of several mouse models of heart failure. Genetic knockdown of Gnao1 ameliorated the cardiac dysfunction and prolonged survival rates in these mouse heart failure models. Conversely, cardiac-specific overexpression of GNAO1 in mice was sufficient to induce cardiac dysfunction. Mechanistically, we observed that increasing Gαo expression increased surface sarcolemmal L-type Ca2+ channel activity, activated CaMKII (calcium/calmodulin-dependent kinase-II) signaling, and impaired Ca2+ handling in ventricular myocytes, which led to cardiac dysfunction. CONCLUSIONS These findings shed light on a novel function of Gαo in the regulation of cardiac Ca2+ homeostasis and systolic function and suggest Gαo may be an effective therapeutic target for the treatment of heart failure.
Collapse
Affiliation(s)
- Hideaki Inazumi
- Cardiovascular Medicine (H.I., Y.N., H.K., K.M., H.Y., T. Nishikimi, T. Kimura), Graduate School of Medicine, Kyoto University
| | - Koichiro Kuwahara
- Cardiovascular Medicine (K.K., M.O., H.M.), School of Medicine, Shinshu University, Matsumoto
| | - Yasuaki Nakagawa
- Cardiovascular Medicine (H.I., Y.N., H.K., K.M., H.Y., T. Nishikimi, T. Kimura), Graduate School of Medicine, Kyoto University
| | - Yoshihiro Kuwabara
- Center for Accessing Early Promising Treatment, Kyoto University Hospital (Y.K.)
| | - Takuro Numaga-Tomita
- Molecular Pharmacology (T.N.-T., M.Y.), School of Medicine, Shinshu University, Matsumoto
| | - Toshihide Kashihara
- Molecular Pharmacology, School of Pharmaceutical Sciences, Kitasato University, Tokyo (T. Kashihara)
| | - Tsutomu Nakada
- Research Center for Supports to Advanced Science (T. Nakada), School of Medicine, Shinshu University, Matsumoto
| | - Nagomi Kurebayashi
- Cellular and Molecular Pharmacology, School of Medicine, Juntendo University, Tokyo (N.K.)
| | - Miku Oya
- Cardiovascular Medicine (K.K., M.O., H.M.), School of Medicine, Shinshu University, Matsumoto
| | - Miki Nonaka
- Pain Control Research, The Jikei University School of Medicine (M.N.)
| | - Masami Sugihara
- Clinical Laboratory Medicine, School of Medicine, Juntendo University, Tokyo (M.S.)
| | - Hideyuki Kinoshita
- Cardiovascular Medicine (H.I., Y.N., H.K., K.M., H.Y., T. Nishikimi, T. Kimura), Graduate School of Medicine, Kyoto University
| | - Kenji Moriuchi
- Cardiovascular Medicine (H.I., Y.N., H.K., K.M., H.Y., T. Nishikimi, T. Kimura), Graduate School of Medicine, Kyoto University
| | | | - Toshio Nishikimi
- Cardiovascular Medicine (H.I., Y.N., H.K., K.M., H.Y., T. Nishikimi, T. Kimura), Graduate School of Medicine, Kyoto University
- Wakakusa Tatsuma Rehabilitation Hospital, Osaka (T. Nishikimi)
| | - Hirohiko Motoki
- Cardiovascular Medicine (K.K., M.O., H.M.), School of Medicine, Shinshu University, Matsumoto
| | - Mitsuhiko Yamada
- Molecular Pharmacology (T.N.-T., M.Y.), School of Medicine, Shinshu University, Matsumoto
| | - Sachio Morimoto
- School of Health Sciences Fukuoka, International University of Health and Welfare, Okawa (S.M.)
| | - Kinya Otsu
- The School of Cardiovascular Medicine and Sciences, King's College London British Heart Foundation Centre of Excellence, United Kingdom (K.O.)
| | | | - Kazuwa Nakao
- Medical Innovation Center (K.N.), Graduate School of Medicine, Kyoto University
| | - Takeshi Kimura
- Cardiovascular Medicine (H.I., Y.N., H.K., K.M., H.Y., T. Nishikimi, T. Kimura), Graduate School of Medicine, Kyoto University
| |
Collapse
|
7
|
Oka SI, Byun J, Huang CY, Imai N, Ralda G, Zhai P, Xu X, Kashyap S, Warren JS, Alan Maschek J, Tippetts TS, Tong M, Venkatesh S, Ikeda Y, Mizushima W, Kashihara T, Sadoshima J. Nampt Potentiates Antioxidant Defense in Diabetic Cardiomyopathy. Circ Res 2021; 129:114-130. [PMID: 33928788 PMCID: PMC8513534 DOI: 10.1161/circresaha.120.317943] [Citation(s) in RCA: 19] [Impact Index Per Article: 6.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Indexed: 11/16/2022]
Abstract
[Figure: see text].
Collapse
MESH Headings
- Animals
- Antioxidants/metabolism
- Apoptosis
- Autophagy
- Cells, Cultured
- Cytokines/genetics
- Cytokines/metabolism
- Diabetic Cardiomyopathies/enzymology
- Diabetic Cardiomyopathies/genetics
- Diabetic Cardiomyopathies/pathology
- Diet, High-Fat
- Disease Models, Animal
- Fibrosis
- Glutathione/metabolism
- Mice, Inbred C57BL
- Mice, Knockout
- Mitochondria, Heart/enzymology
- Mitochondria, Heart/genetics
- Mitochondria, Heart/pathology
- Mitophagy
- Myocytes, Cardiac/enzymology
- Myocytes, Cardiac/pathology
- NAD/metabolism
- NADP/metabolism
- Nicotinamide Phosphoribosyltransferase/genetics
- Nicotinamide Phosphoribosyltransferase/metabolism
- Oxidative Stress
- Rats, Wistar
- Sirtuins/genetics
- Sirtuins/metabolism
- Thioredoxins/metabolism
- Mice
- Rats
Collapse
Affiliation(s)
- Shin-Ichi Oka
- Department of Cell Biology and Molecular Medicine (S.-i.O., J.B., C.-y.H., N.I., G.R., P.Z., X.X., S.K., M.T., Y.I., W.M., T.K., J.S.), Rutgers New Jersey Medical School, Newark
| | - Jaemin Byun
- Department of Cell Biology and Molecular Medicine (S.-i.O., J.B., C.-y.H., N.I., G.R., P.Z., X.X., S.K., M.T., Y.I., W.M., T.K., J.S.), Rutgers New Jersey Medical School, Newark
| | - Chun-Yang Huang
- Department of Cell Biology and Molecular Medicine (S.-i.O., J.B., C.-y.H., N.I., G.R., P.Z., X.X., S.K., M.T., Y.I., W.M., T.K., J.S.), Rutgers New Jersey Medical School, Newark
- Division of Cardiovascular Surgery, Department of Surgery, Taipei Veterans General Hospital, Taiwan (C.-y.H.)
- Institute of Clinical Medicine, School of Medicine National Yang-Ming University, Taipei, Taiwan (C.-y.H.)
| | - Nobushige Imai
- Department of Cell Biology and Molecular Medicine (S.-i.O., J.B., C.-y.H., N.I., G.R., P.Z., X.X., S.K., M.T., Y.I., W.M., T.K., J.S.), Rutgers New Jersey Medical School, Newark
| | - Guersom Ralda
- Department of Cell Biology and Molecular Medicine (S.-i.O., J.B., C.-y.H., N.I., G.R., P.Z., X.X., S.K., M.T., Y.I., W.M., T.K., J.S.), Rutgers New Jersey Medical School, Newark
| | - Peiyong Zhai
- Department of Cell Biology and Molecular Medicine (S.-i.O., J.B., C.-y.H., N.I., G.R., P.Z., X.X., S.K., M.T., Y.I., W.M., T.K., J.S.), Rutgers New Jersey Medical School, Newark
| | - Xiaoyong Xu
- Department of Cell Biology and Molecular Medicine (S.-i.O., J.B., C.-y.H., N.I., G.R., P.Z., X.X., S.K., M.T., Y.I., W.M., T.K., J.S.), Rutgers New Jersey Medical School, Newark
- Department of Cardiology, Ningbo Medical Center Lihuili Hospital, Zhejiang, China (X.X.)
| | - Sanchita Kashyap
- Department of Cell Biology and Molecular Medicine (S.-i.O., J.B., C.-y.H., N.I., G.R., P.Z., X.X., S.K., M.T., Y.I., W.M., T.K., J.S.), Rutgers New Jersey Medical School, Newark
| | - Junco S Warren
- Nora Eccles Harrison Cardiovascular Research and Training Institute (J.S.W.), University of Utah, Salt Lake City
| | - John Alan Maschek
- Metabolomics, Proteomics, and Mass Spectrometry Cores (J.A.M.), University of Utah, Salt Lake City
- Department of Nutrition and Integrative Physiology (J.A.M.), University of Utah, Salt Lake City
| | - Trevor S Tippetts
- Department of Nutrition and Integrative Physiology and the Diabetes and Metabolism Research Center (T.S.T., S.V.), University of Utah, Salt Lake City
| | - Mingming Tong
- Department of Cell Biology and Molecular Medicine (S.-i.O., J.B., C.-y.H., N.I., G.R., P.Z., X.X., S.K., M.T., Y.I., W.M., T.K., J.S.), Rutgers New Jersey Medical School, Newark
| | - Sundararajan Venkatesh
- Department of Microbiology, Biochemistry, and Molecular Genetics (S.V.), Rutgers New Jersey Medical School, Newark
- Department of Nutrition and Integrative Physiology and the Diabetes and Metabolism Research Center (T.S.T., S.V.), University of Utah, Salt Lake City
| | - Yoshiyuki Ikeda
- Department of Cell Biology and Molecular Medicine (S.-i.O., J.B., C.-y.H., N.I., G.R., P.Z., X.X., S.K., M.T., Y.I., W.M., T.K., J.S.), Rutgers New Jersey Medical School, Newark
| | - Wataru Mizushima
- Department of Cell Biology and Molecular Medicine (S.-i.O., J.B., C.-y.H., N.I., G.R., P.Z., X.X., S.K., M.T., Y.I., W.M., T.K., J.S.), Rutgers New Jersey Medical School, Newark
| | - Toshihide Kashihara
- Department of Cell Biology and Molecular Medicine (S.-i.O., J.B., C.-y.H., N.I., G.R., P.Z., X.X., S.K., M.T., Y.I., W.M., T.K., J.S.), Rutgers New Jersey Medical School, Newark
| | - Junichi Sadoshima
- Department of Cell Biology and Molecular Medicine (S.-i.O., J.B., C.-y.H., N.I., G.R., P.Z., X.X., S.K., M.T., Y.I., W.M., T.K., J.S.), Rutgers New Jersey Medical School, Newark
| |
Collapse
|
8
|
Kashihara T, Kawagishi H, Nakada T, Numaga-Tomita T, Kadota S, Wolf EE, Du CK, Shiba Y, Morimoto S, Yamada M. β-Arrestin-Biased AT 1 Agonist TRV027 Causes a Neonatal-Specific Sustained Positive Inotropic Effect Without Increasing Heart Rate. JACC Basic Transl Sci 2020; 5:1057-1069. [PMID: 33294739 PMCID: PMC7691286 DOI: 10.1016/j.jacbts.2020.08.011] [Citation(s) in RCA: 9] [Impact Index Per Article: 2.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 05/28/2020] [Revised: 08/31/2020] [Accepted: 08/31/2020] [Indexed: 01/14/2023]
Abstract
The treatment of pediatric heart failure is a long-standing unmet medical need. Angiotensin II supports mammalian perinatal circulation by activating cardiac L-type Ca2+ channels through angiotensin type 1 receptor (AT1R) and β-arrestin. TRV027, a β-arrestin-biased AT1R agonist, that has been reported to be safe but not effective for adult patients with heart failure, activates the AT1R/β-arrestin pathway. We found that TRV027 evokes a long-acting positive inotropic effect specifically on immature cardiac myocytes through the AT1R/β-arrestin/L-type Ca2+ channel pathway with minimum effect on heart rate, oxygen consumption, reactive oxygen species production, and aldosterone secretion. Thus, TRV027 could be utilized as a valuable drug specific for pediatric heart failure.
Collapse
Key Words
- AT1R, angiotensin type 1 receptor
- AngII, angiotensin II
- BBA, β-arrestin–biased angiotensin type 1 receptor agonist
- ECG, electrocardiography
- GPCR, G protein–coupled receptor
- LTCC, CaV1.2 L-type Ca2+ channel
- OCR, oxygen consumption rate
- PHF, pediatric heart failure
- ROS, reactive oxygen species
- TRV027
- UCG, ultrasound cardiogram
- congenital dilated cardiomyopathy
- hiPSC-CM, human induced pluripotent stem cell–derived cardiac myocyte
- human induced pluripotent stem cell-derived cardiac myocytes
- inotropic vasodilator
- mNVCM, mouse neonatal ventricular cardiac myocyte
- neonate
- pediatric heart failure
- β-arrestin–biased AT1 angiotensin receptor agonist
Collapse
Affiliation(s)
- Toshihide Kashihara
- Department of Molecular Pharmacology, Shinshu University School of Medicine, Matsumoto, Japan
| | - Hiroyuki Kawagishi
- Department of Molecular Pharmacology, Shinshu University School of Medicine, Matsumoto, Japan.,Department of Biotechnology, Institute for Biomedical Sciences, Shinshu University, Matsumoto, Japan
| | - Tsutomu Nakada
- Department of Instrumental Analysis, Research Center for Supports to Advanced Science, Shinshu University, Matsumoto, Japan
| | - Takuro Numaga-Tomita
- Department of Molecular Pharmacology, Shinshu University School of Medicine, Matsumoto, Japan
| | - Shin Kadota
- Department of Biotechnology, Institute for Biomedical Sciences, Shinshu University, Matsumoto, Japan.,Department of Regenerative Science and Medicine, School of Medicine, Shinshu University, Matsumoto, Japan
| | - Elena E Wolf
- Division of Nephrology and Division of Vascular Endothelium and Microcirculation, Department of Internal Medicine III, University Hospital Carl Gustav Carus, Technische Universität Dresden, Dresden, Germany
| | - Cheng-Kun Du
- Department of Cardiac Physiology, National Cerebral and Cardiovascular Center Research Institute, Suita, Japan
| | - Yuji Shiba
- Department of Biotechnology, Institute for Biomedical Sciences, Shinshu University, Matsumoto, Japan.,Department of Regenerative Science and Medicine, School of Medicine, Shinshu University, Matsumoto, Japan
| | - Sachio Morimoto
- School of Health Sciences Fukuoka, International University of Health and Welfare, Okawa, Japan
| | - Mitsuhiko Yamada
- Department of Molecular Pharmacology, Shinshu University School of Medicine, Matsumoto, Japan
| |
Collapse
|
9
|
Inaba K, Okuma K, Murakami N, Kashihara T, Okamoto H, Nakamura S, Nishioka S, Takahashi A, Takahashi K, Igaki H, Nakayama Y, Itami J. The Treatment Results of Reduced Dose Radiotherapy For Gastric MALT Lymphoma. Int J Radiat Oncol Biol Phys 2020. [DOI: 10.1016/j.ijrobp.2020.07.197] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/16/2022]
|
10
|
Kashihara T, Inaba K, Okuma K, Takahashi K, Murakami N, Igaki H, Nakayama Y, Itami J. Comparative Analysis of Esophageal Stenosis After Irradiation for T1N0M0 Esophageal Cancer Using Inverse Probability Weighting Between Prophylactic Irradiation After Endoscopic Treatment and Definitive Radiotherapy. Int J Radiat Oncol Biol Phys 2020. [DOI: 10.1016/j.ijrobp.2020.07.1935] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
|
11
|
Inazumi H, Kuwahara K, Kuwabara Y, Nakagawa Y, Kinoshita H, Moriuchi K, Yanagisawa H, Nishikimi T, Oya M, Yamada M, Kashihara T, Kurebayashi N, Sugihara M, Nakao K, Kimura T. NRSF-GNAO1-CaMK2 axis exacerbates cardiac remodeling and progresses heart failure by impairing Ca2+ homeostasis. Eur Heart J 2020. [DOI: 10.1093/ehjci/ehaa946.3672] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Indexed: 11/14/2022] Open
Abstract
Abstract
Background
In the development of heart failure, pathological intracellular signaling reactivates fetal cardiac genes, which leads to maladaptive remodeling and cardiac dysfunction. We previously reported that a transcriptional repressor, neuron restrictive silencer factor (NRSF) represses fetal cardiac genes and maintains normal cardiac function under normal conditions, while hypertrophic stimuli de-repress this NRSF mediated repression via activation of CaMKII. Molecular mechanisms by which NRSF maintains cardiac systolic function remains to be determined, however.
Purpose
To elucidate how NRSF maintains normal cardiac homeostasis and identify the novel therapeutic targets for heart failure.
Methods and results
We generated cardiac-specific NRSF knockout mice (NRSF cKO), and found that these NRSF cKO showed cardiac dysfunction and premature deaths accompanied with lethal arrhythmias, as was observed in our previously reported cardiac-specific dominant-negative mutant of NRSF transgenic mice (dnNRSF-Tg).
By cDNA microarray analysis of dnNRSF-Tg and NRSF-cKO, we identified that expression of Gnao1 gene encoding Gαo, a member of inhibitory G proteins, was commonly increased in ventricles of both types of mice.
ChIP-seq analysis, reporter assay and electrophoretic mobility shift assay identified that NRSF transcriptionally regulates Gnao1 gene expression.
Genetic Knockdown of Gαo in dnNRSF-Tg and NRSF-cKO by crossing these mice with Gnao1 knockout mice ameliorated the reduced systolic function, increased arrhythmogenicity and reduced survival rates.
Transgenic mice expressing a human GNAO1 in their hearts (GNAO1-Tg) showed progressive cardiac dysfunction with cardiac dilation. Ventricles obtained from GNAO1-Tg have increased phosphorylation level of CaMKII and increased expression level of endogenous mouse Gnao1 gene. These data suggest that increased cardiac expression of Gαo is sufficient to induce pathological Ca2+-dependent signaling and cardiac dysfunction, and that Gαo forms a positive regulatory circuit with CaMKII and NRSF.
Electrophysiological analysis in ventricular myocytes of dnNRSF-Tg revealed that impaired Ca2+ handling via alterations in localized L-type calcium channel (LTCC) activities; decreased T-tubular and increased surface sarcolemmal LTCC activities, underlies Gαo-mediated cardiac dysfunction.
Furthermore, we also identified increased expression of Gαo in ventricles of two different heart failure mice models, mice with transverse aortic constriction and mice carrying a mutant cardiac troponin T, and confirmed that genetic reduction of Gαo prevented the progression of cardiac dysfunction in both types of mice.
Conclusions
Increased expression of Gαo, induced by attenuation of NRSF-mediated repression forms a pathological circuit via activation of CaMKII. This circuit exacerbates cardiac remodeling and progresses heart failure by impairing Ca2+ homeostasis. Gαo is a potential therapeutic target for heart failure.
Figure 1
Funding Acknowledgement
Type of funding source: Public grant(s) – National budget only. Main funding source(s): Grants-in –Aid for Scientific Research from the Japan Society for the Promotion of Science
Collapse
Affiliation(s)
- H Inazumi
- Kyoto University Graduate School of Medicine, Kyoto, Japan
| | - K Kuwahara
- Shinsyu University School of Medicine, matsumoto, Japan
| | - Y Kuwabara
- Kyoto University Graduate School of Medicine, Kyoto, Japan
| | - Y Nakagawa
- Kyoto University Graduate School of Medicine, Kyoto, Japan
| | - H Kinoshita
- Kyoto University Graduate School of Medicine, Kyoto, Japan
| | - K Moriuchi
- Kyoto University Graduate School of Medicine, Kyoto, Japan
| | - H Yanagisawa
- Kyoto University Graduate School of Medicine, Kyoto, Japan
| | - T Nishikimi
- Kyoto University Graduate School of Medicine, Kyoto, Japan
| | - M Oya
- Shinsyu University School of Medicine, matsumoto, Japan
| | - M Yamada
- Shinsyu University School of Medicine, matsumoto, Japan
| | - T Kashihara
- Shinsyu University School of Medicine, matsumoto, Japan
| | - N Kurebayashi
- Juntendo University Graduate School of Medicine, tokyo, Japan
| | - M Sugihara
- Juntendo University Graduate School of Medicine, tokyo, Japan
| | - K Nakao
- Kyoto University Graduate School of Medicine, Kyoto, Japan
| | - T Kimura
- Kyoto University Graduate School of Medicine, Kyoto, Japan
| |
Collapse
|
12
|
Venkatesh S, Baljinnyam E, Tong M, Kashihara T, Yan L, Liu T, Li H, Xie LH, Nakamura M, Oka SI, Suzuki CK, Fraidenraich D, Sadoshima J. Proteomic analysis of mitochondrial biogenesis in cardiomyocytes differentiated from human induced pluripotent stem cells. Am J Physiol Regul Integr Comp Physiol 2020; 320:R547-R562. [PMID: 33112656 DOI: 10.1152/ajpregu.00207.2020] [Citation(s) in RCA: 9] [Impact Index Per Article: 2.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/20/2022]
Abstract
Mitochondria play key roles in the differentiation and maturation of human cardiomyocytes (CMs). As human induced pluripotent stem cell-derived cardiomyocytes (hiPSC-CMs) hold potential in the treatment of heart diseases, we sought to identify key mitochondrial pathways and regulators, which may provide targets for improving cardiac differentiation and maturation. Proteomic analysis was performed on enriched mitochondrial protein extracts isolated from hiPSC-CMs differentiated from dermal fibroblasts (dFCM) and cardiac fibroblasts (cFCM) at time points between 12 and 115 days of differentiation, and from adult and neonatal mouse hearts. Mitochondrial proteins with a twofold change at time points up to 120 days relative to 12 days were subjected to ingenuity pathway analysis (IPA). The highest upregulation was in metabolic pathways for fatty acid oxidation (FAO), the tricarboxylic acid (TCA) cycle, oxidative phosphorylation (OXPHOS), and branched chain amino acid (BCAA) degradation. The top upstream regulators predicted to be activated were peroxisome proliferator-activated receptor γ coactivator 1 α (PGC1-α), the insulin receptor (IR), and the retinoblastoma protein (Rb1) transcriptional repressor. IPA and immunoblotting showed upregulation of the mitochondrial LonP1 protease-a regulator of mitochondrial proteostasis, energetics, and metabolism. LonP1 knockdown increased FAO in neonatal rat ventricular cardiomyocytes (nRVMs). Our results support the notion that LonP1 upregulation negatively regulates FAO in cardiomyocytes to calibrate the flux between glucose and fatty acid oxidation. We discuss potential mechanisms by which IR, Rb1, and LonP1 regulate the metabolic shift from glycolysis to OXPHOS and FAO. These newly identified factors and pathways may help in optimizing the maturation of iPSC-CMs.
Collapse
Affiliation(s)
- Sundararajan Venkatesh
- Department of Microbiology, Biochemistry and Molecular Genetics, Rutgers University-New Jersey Medical School, Newark, New Jersey
| | - Erdene Baljinnyam
- Department of Cell Biology and Molecular Medicine, Rutgers University-New Jersey Medical School, Newark, New Jersey
| | - Mingming Tong
- Department of Cell Biology and Molecular Medicine, Rutgers University-New Jersey Medical School, Newark, New Jersey
| | - Toshihide Kashihara
- Department of Cell Biology and Molecular Medicine, Rutgers University-New Jersey Medical School, Newark, New Jersey
| | - Lin Yan
- Center for Advanced Proteomics Research and Department of Microbiology, Biochemistry and Molecular Genetics, Cancer Center, Rutgers University-New Jersey Medical School, Newark, New Jersey
| | - Tong Liu
- Center for Advanced Proteomics Research and Department of Microbiology, Biochemistry and Molecular Genetics, Cancer Center, Rutgers University-New Jersey Medical School, Newark, New Jersey
| | - Hong Li
- Center for Advanced Proteomics Research and Department of Microbiology, Biochemistry and Molecular Genetics, Cancer Center, Rutgers University-New Jersey Medical School, Newark, New Jersey
| | - Lai-Hua Xie
- Department of Cell Biology and Molecular Medicine, Rutgers University-New Jersey Medical School, Newark, New Jersey
| | - Michinari Nakamura
- Department of Cell Biology and Molecular Medicine, Rutgers University-New Jersey Medical School, Newark, New Jersey
| | - Shin-Ichi Oka
- Department of Cell Biology and Molecular Medicine, Rutgers University-New Jersey Medical School, Newark, New Jersey
| | - Carolyn K Suzuki
- Department of Microbiology, Biochemistry and Molecular Genetics, Rutgers University-New Jersey Medical School, Newark, New Jersey
| | - Diego Fraidenraich
- Department of Cell Biology and Molecular Medicine, Rutgers University-New Jersey Medical School, Newark, New Jersey
| | - Junichi Sadoshima
- Department of Cell Biology and Molecular Medicine, Rutgers University-New Jersey Medical School, Newark, New Jersey
| |
Collapse
|
13
|
Oka SI, Chin A, Park JY, Ikeda S, Mizushima W, Ralda G, Zhai P, Tong M, Byun J, Tang F, Einaga Y, Huang CY, Kashihara T, Zhao M, Nah J, Tian B, Hirabayashi Y, Yodoi J, Sadoshima J. Thioredoxin-1 maintains mitochondrial function via mechanistic target of rapamycin signalling in the heart. Cardiovasc Res 2020; 116:1742-1755. [PMID: 31584633 PMCID: PMC7825501 DOI: 10.1093/cvr/cvz251] [Citation(s) in RCA: 10] [Impact Index Per Article: 2.5] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 05/08/2019] [Revised: 08/29/2019] [Accepted: 09/26/2019] [Indexed: 12/12/2022] Open
Abstract
AIMS Thioredoxin 1 (Trx1) is an evolutionarily conserved oxidoreductase that cleaves disulphide bonds in oxidized substrate proteins such as mechanistic target of rapamycin (mTOR) and maintains nuclear-encoded mitochondrial gene expression. The cardioprotective effect of Trx1 has been demonstrated via cardiac-specific overexpression of Trx1 and dominant negative Trx1. However, the pathophysiological role of endogenous Trx1 has not been defined with a loss-of-function model. To address this, we have generated cardiac-specific Trx1 knockout (Trx1cKO) mice. METHODS AND RESULTS Trx1cKO mice were viable but died with a median survival age of 25.5 days. They developed heart failure, evidenced by contractile dysfunction, hypertrophy, and increased fibrosis and apoptotic cell death. Multiple markers consistently indicated increased oxidative stress and RNA-sequencing revealed downregulation of genes involved in energy production in Trx1cKO mice. Mitochondrial morphological abnormality was evident in these mice. Although heterozygous Trx1cKO mice did not show any significant baseline phenotype, pressure-overload-induced cardiac dysfunction, and downregulation of metabolic genes were exacerbated in these mice. mTOR was more oxidized and phosphorylation of mTOR substrates such as S6K and 4EBP1 was impaired in Trx1cKO mice. In cultured cardiomyocytes, Trx1 knockdown inhibited mitochondrial respiration and metabolic gene promoter activity, suggesting that Trx1 maintains mitochondrial function in a cell autonomous manner. Importantly, mTOR-C1483F, an oxidation-resistant mutation, prevented Trx1 knockdown-induced mTOR oxidation and inhibition and attenuated suppression of metabolic gene promoter activity. CONCLUSION Endogenous Trx1 is essential for maintaining cardiac function and metabolism, partly through mTOR regulation via Cys1483.
Collapse
Affiliation(s)
- Shin-Ichi Oka
- Department of Cell Biology and Molecular Medicine, Rutgers New Jersey Medical School, Newark, NJ 07101, USA
| | - Adave Chin
- Department of Cell Biology and Molecular Medicine, Rutgers New Jersey Medical School, Newark, NJ 07101, USA
| | - Ji Yeon Park
- Seoul National University Biomedical Informatics, Division of Biomedical Informatics, Seoul National University College of Medicine, Seoul, Republic of Korea
| | - Shohei Ikeda
- Department of Cell Biology and Molecular Medicine, Rutgers New Jersey Medical School, Newark, NJ 07101, USA
| | - Wataru Mizushima
- Department of Cell Biology and Molecular Medicine, Rutgers New Jersey Medical School, Newark, NJ 07101, USA
| | - Guersom Ralda
- Department of Cell Biology and Molecular Medicine, Rutgers New Jersey Medical School, Newark, NJ 07101, USA
| | - Peiyong Zhai
- Department of Cell Biology and Molecular Medicine, Rutgers New Jersey Medical School, Newark, NJ 07101, USA
| | - Mingming Tong
- Department of Cell Biology and Molecular Medicine, Rutgers New Jersey Medical School, Newark, NJ 07101, USA
| | - Jaemin Byun
- Department of Cell Biology and Molecular Medicine, Rutgers New Jersey Medical School, Newark, NJ 07101, USA
| | - Fan Tang
- Department of Cell Biology and Molecular Medicine, Rutgers New Jersey Medical School, Newark, NJ 07101, USA
| | - Yudai Einaga
- Department of Cell Biology and Molecular Medicine, Rutgers New Jersey Medical School, Newark, NJ 07101, USA
| | - Chun-Yang Huang
- Department of Cell Biology and Molecular Medicine, Rutgers New Jersey Medical School, Newark, NJ 07101, USA
- Division of Cardiovascular Surgery, Department of Surgery, Taipei Veterans General Hospital, Taipei, Taiwan
- Institute of Clinical Medicine, School of Medicine National Yang-Ming University, Taipei, Taiwan
| | - Toshihide Kashihara
- Department of Cell Biology and Molecular Medicine, Rutgers New Jersey Medical School, Newark, NJ 07101, USA
| | - Mengyuan Zhao
- Department of Cell Biology and Molecular Medicine, Rutgers New Jersey Medical School, Newark, NJ 07101, USA
| | - Jihoon Nah
- Department of Cell Biology and Molecular Medicine, Rutgers New Jersey Medical School, Newark, NJ 07101, USA
| | - Bin Tian
- Department of Biochemistry & Molecular Biology, Rutgers New Jersey Medical School, Newark, NJ 07101, USA
| | - Yoko Hirabayashi
- Division of Cellular and Molecular Toxicology, Center for Biological Safety and Research, National Institute of Health Sciences, Tokyo 158-8501, Japan
| | - Junji Yodoi
- Department of Biological Responses, Laboratory of Infection and Prevention, Institute for Virus Research, Kyoto University, Sakyo-ku, Kyoto, 606-8397, Japan
| | - Junichi Sadoshima
- Department of Cell Biology and Molecular Medicine, Rutgers New Jersey Medical School, Newark, NJ 07101, USA
| |
Collapse
|
14
|
Oka S, Byun J, Huang CY, Imai N, Ralda G, Zhai P, Xu X, Ikeda Y, Mizushima W, Kashihara T, Sadoshima J. Abstract 394: Nicotinamide Phosphoribosyltransferase (Nampt) Potentiates Antioxidant Defense in Diastolic Heart Failure Associated With Diabetes. Circ Res 2020. [DOI: 10.1161/res.127.suppl_1.394] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Indexed: 11/16/2022]
Abstract
More than half of diabetic patients develop diastolic heart failure. Nampt is a rate-limiting enzyme for NAD synthesis. Phosphorylation of NAD by NAD kinase (NADK) generates NAD phosphate (NADP), which is in turn converted to NADPH and provides the GSH and thioredoxin (Trx) systems with a reducing power. Whether Nampt is protective against diabetic cardiomyopathy (DCM) and, if so, whether NADK mediates the salutary function of Nampt are unknown. We employed mice with cardiac-specific Nampt overexpression (Nampt-cTG) and a mouse model of DCM induced by high fat diet (HFD) consumption. HFD-induced diastolic dysfunction, indicated by an elevated end-diastolic pressure-volume relationship (EDPVR), was ameliorated in Nampt-cTG mice (EDPVR: wild-type mice (WT) Normal Diet (ND): 0.045; WT HFD (1 month): 0.136; Nampt-cTG: 0.042: Nampt-cTG HFD: 0.055*, p<0.05 vs WT HFD). The protective effect was abolished by thionicotinamide, an NADK inhibitor (EDPVR: Nampt-cKO HFD with thionicotinamide 0.12*, p<0.05 vs Nampt-cKO HFD). Nampt overexpression also attenuated HFD-induced increases in GSSG/GSH and oxidation of Trx1 substrates, including peroxiredoxin 1 (Prdx1). Nampt overexpression upregulated not only NAD(H) (1.5 fold) but also NADP(H) (1.3 fold) in the heart and in cardiomyocytes. Nampt-induced NADPH upregulation was abolished in the presence of NADK knockdown. Nampt attenuated H
2
O
2
-induced oxidation of Trx1 substrates in an NADK-dependent manner in cardiomyocytes. Nampt overexpression inhibited H
2
O
2
-induced cell death, an effect that was attenuated in the presence of NADK inhibition. Systemic Nampt heterozygous knockout promoted HFD-induced diastolic dysfunction and oxidative stress in the heart
in vivo
. These results suggest that Nampt protects the heart against diastolic dysfunction through upregulation of the reducing system, which occurs through NADK-dependent upregulation of the reducing equivalent, namely NADPH.
Collapse
|
15
|
Okuma K, Igaki H, Okamoto H, Nishioka S, Iijima K, Kashihara T, Takahashi K, Murakami N, Nakayama Y, Itami J. SP-008: Clinical experiences and Dosimetry of MR guided X-ray Therapy (MRXT). Radiother Oncol 2019. [DOI: 10.1016/s0167-8140(20)30560-0] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/23/2022]
|
16
|
Inazumi H, Kuwahara K, Kuwabara Y, Nakagawa Y, Kinoshita H, Moriuchi K, Yanagisawa H, Nishikimi T, Oya M, Yamada M, Kashihara T, Kurebayashi N, Sugihara M, Nakao K, Kimura T. 4968Increased Gao expression underlies cardiac dysfunction and lethal arrhythmias accompanied with abnormal Ca2+ handling. Eur Heart J 2019. [DOI: 10.1093/eurheartj/ehz746.0027] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Indexed: 11/14/2022] Open
Abstract
Abstract
Background
We previously demonstrated that a transcriptional repressor, neuron restrictive silencer factor (NRSF), maintains normal cardiac function and electrical stability. Transgenic mice expressing a dominant-negative mutant of NRSF in their hearts (dnNRSF-Tg) exhibit systolic dysfunction with cardiac dilation and premature death due to lethal arrhythmias like human dilated cardiomyopathy (DCM). Underlining mechanisms remain to be elucidated, however.
Purpose
We studied underling mechanisms by which NRSF maintains normal cardiac function to identify novel therapeutic targets for heart failure.
Methods and results
We generated cardiac-specific NRSF knockout mice (NRSFcKO) and confirmed that cardiac phenotypes of NRSFcKO are similar to those of dnNRSF-Tg.
cDNA microarray analysis revealed that cardiac gene expression of GNAO1 that encodes Gαo, a member of inhibitory G protein Gαi family, is increased in both dnNRSF-Tg and NRSFcKO ventricles.
We confirmed that GNAO1 is a direct target of NRSF through ChIP-seq analysis, reporter assay and electrophoretic mobility shift assay.
In dnNRSF-Tg, pharmacological inhibition of Gαo with pertussis toxin improved systolic dysfunction and knockdown of Gαo by crossing with GNAO1 knockout mice improved not only systolic function but also frequency of ventricular arrhythmias and survival rates.
Electrophysiological and biochemical analysis in ventricular myocytes obtained from dnNRSF-Tg demonstrated that genetic reduction of Gαo ameliorated abnormalities in Ca2+ handling, which include increased current density in surface sarcolemmal L-type Ca2+ channel, reduced content of sarcoplasmic reticulum Ca2+ and lowered peak of Ca2+ transient. Furthermore, genetic reduction of Gαo attenuated increased phosphorylation levels of CAMKII in dnNRSF-Tg ventricles, which presumably underlies the improvement in Ca2+ handling. In addition, we identified increased Gαo expression in ventricles of heart failure model mice induced by transverse aortic constriction and cardiac troponin T mutant DCM model mice, in both of which, genetic reduction of Gαo ameliorated cardiac dysfunction.
Figure 1
Conclusions
We found that increased expression of Gαo, induced by attenuation of NRSF-mediated repression, plays a crucial role in the progression of cardiac dysfunction and lethal arrhythmias by evoking Ca2+ handling abnormality. These data demonstrate that Gαo is a potential therapeutic target for heart failure.
Collapse
Affiliation(s)
- H Inazumi
- Kyoto University Graduate School of Medicine, Kyoto, Japan
| | - K Kuwahara
- Shinsyu University School of Medicine, matsumoto, Japan
| | | | - Y Nakagawa
- Kyoto University Graduate School of Medicine, Kyoto, Japan
| | - H Kinoshita
- Kyoto University Graduate School of Medicine, Kyoto, Japan
| | - K Moriuchi
- Kyoto University Graduate School of Medicine, Kyoto, Japan
| | - H Yanagisawa
- Kyoto University Graduate School of Medicine, Kyoto, Japan
| | - T Nishikimi
- Kyoto University Graduate School of Medicine, Kyoto, Japan
| | - M Oya
- Shinsyu University School of Medicine, matsumoto, Japan
| | - M Yamada
- Shinsyu University School of Medicine, matsumoto, Japan
| | - T Kashihara
- Shinsyu University School of Medicine, matsumoto, Japan
| | - N Kurebayashi
- Juntendo University Graduate School of Medicine, tokyo, Japan
| | - M Sugihara
- Juntendo University Graduate School of Medicine, tokyo, Japan
| | - K Nakao
- Kyoto University Graduate School of Medicine, Kyoto, Japan
| | - T Kimura
- Kyoto University Graduate School of Medicine, Kyoto, Japan
| |
Collapse
|
17
|
Affiliation(s)
- Toshihide Kashihara
- Department of Cell Biology and Molecular Medicine, Cardiovascular Research Institute, Rutgers New Jersey Medical School, Newark, NJ, USA
| | - Daniela Zablocki
- Department of Cell Biology and Molecular Medicine, Cardiovascular Research Institute, Rutgers New Jersey Medical School, Newark, NJ, USA
| | - Junichi Sadoshima
- Department of Cell Biology and Molecular Medicine, Cardiovascular Research Institute, Rutgers New Jersey Medical School, Newark, NJ, USA
| |
Collapse
|
18
|
Kashihara T, Sadoshima J. Abstract 280: The Effect of YAP/TAZ on Glycolysis and Mitochondrial Oxidative Phosphorylation in Cardiomyocytes. Circ Res 2019. [DOI: 10.1161/res.125.suppl_1.280] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Indexed: 11/16/2022]
Abstract
The heart requires a high rate of adenosine triphosphate (ATP) production to maintain healthy cardiac function and viability. Anaerobic glycolysis and mitochondrial oxidative phosphorylation (OXPHOS) are the main metabolic pathways by which ATP is generated in mammalian cells, including cardiomyocytes. Yes-associated protein 1 (YAP) and transcriptional coactivator with PDZ-binding motif (TAZ), which are major downstream effectors of the Hippo signaling pathway, play an important role in the regulation of heart size and cellular homeostasis of cardiomyocytes. However, interplay between YAP/TAZ and cardiac energy metabolism has been poorly understood. Here we examined the effect of YAP/TAZ on glycolysis and OXPHOS in isolated neonatal rat ventricular cardiomyocytes (NRVMs). Extracellular acidification rate (ECAR; an index of glycolysis) and oxygen consumption rate (OCR; an index of OXPHOS) of NRVMs transduced with adenoviruses harboring YAP, TAZ, or LacZ (control) for 6 days were assessed by Seahorse XFe96 analyzer. Both YAP and TAZ significantly increased not only the ECAR of basal glycolysis (1.5-fold and 1.3-fold, respectively, p<0.05), glycolytic maximal capacity (1.4-fold and 1.3-fold, respectively, p<0.05), and glycolytic reserve capacity (1.3-fold and 1.2-fold, respectively, P<0.05) (n=12-15) but also basal OCR (1.3-fold and 1.3-fold, respectively, p<0.05) (n=6-10) compared to control LacZ. Quantitative PCR analysis showed that mRNA levels of Pfkm, a key glycolytic enzyme, and subunits of protein complexes I though V in the electron transport chain are significantly increased (1.3-1.9-fold, n=5-6, p<0.05) by both YAP and TAZ compared with control. These results suggest that YAP/TAZ increase ATP production by accelerating glycolysis and OXPHOS in cardiomyocytes.
Collapse
|
19
|
Okuma K, Okamoto H, Iijima K, Nishioka F, Kashihara T, Shima S, Uematsu M, Igaki H, Nakayama Y, Itami J, Murakami N, Nakamura S. EP-1403 Retrospective evaluation of usefulness of MR-guided adaptive radiotherapy of gastric MALT lymphoma. Radiother Oncol 2019. [DOI: 10.1016/s0167-8140(19)31823-7] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/30/2022]
|
20
|
Guo R, Hu X, Yamada Y, Harada M, Nakajima T, Kashihara T, Yamada M, Aoyama T, Kamijo Y. Effects of hypertension and antihypertensive treatments on sulfatide levels in serum and its metabolism. Hypertens Res 2018; 42:598-609. [DOI: 10.1038/s41440-018-0160-z] [Citation(s) in RCA: 6] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/19/2018] [Revised: 10/08/2018] [Accepted: 10/11/2018] [Indexed: 11/09/2022]
|
21
|
Yamada Y, Harada M, Hashimoto K, Guo R, Nakajima T, Kashihara T, Yamada M, Aoyama T, Kamijo Y. Impact of chronic kidney dysfunction on serum Sulfatides and its metabolic pathway in mice. Glycoconj J 2018; 36:1-11. [PMID: 30536036 DOI: 10.1007/s10719-018-9850-7] [Citation(s) in RCA: 9] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/11/2018] [Revised: 11/21/2018] [Accepted: 11/29/2018] [Indexed: 02/07/2023]
Abstract
Serum sulfatides are critical glycosphingolipids that are present in lipoproteins and exert anticoagulant effects. A previous study reported decreased levels of serum sulfatides in hemodialysis patients and suggested an association with cardiovascular disease. However, the mechanism of changes in serum sulfatides in chronic kidney dysfunction has not been well investigated. The current study examined whether a chronic kidney disease (CKD) state could decrease serum sulfatide levels using 5/6 nephrectomy (5/6NCKD) mice, an established CKD murine model, and studied the mechanisms contributing to diminished sulfatides. 5/6NCKD mice and sham operation control mice were sacrificed at the 4th or 12th postoperative week (POW) for measurement of serum sulfatide levels. Hepatic sulfatide content, which is the origin of serum sulfatides, and the expression of sulfatide metabolic enzymes in liver tissue were assessed as well. The 5/6NCKD mice developed CKD and showed increased serum creatinine and indoxyl sulfate. The serum levels and hepatic amounts of sulfatides were significantly decreased in 5/6NCKD mice at both 4 and 12 POW, while the degradative enzymes of sulfatides arylsulfatase A and galactosylceramidase were significantly increased. In a Hepa1-6 murine liver cell line, indoxyl sulfate addition caused intracellular levels of sulfatides to decrease and degradative enzymes of sulfatides to increase in a manner comparable to the changes in 5/6NCKD mice liver tissue. In conclusion, chronic kidney dysfunction causes degradation of sulfatides in the liver to decrease serum sulfatide levels. One explanation of these results is that indoxyl sulfate, a uremic toxin, accelerates the degradation of sulfatides in liver tissue.
Collapse
Affiliation(s)
- Yosuke Yamada
- Department of Metabolic Regulation, Shinshu University School of Medicine, 3-1-1 Asahi, Matsumoto, Nagano, 390-8621, Japan
- Department of Nephrology, Shinshu University School of Medicine, 3-1-1 Asahi, Matsumoto, Nagano, 390-8621, Japan
| | - Makoto Harada
- Department of Nephrology, Shinshu University School of Medicine, 3-1-1 Asahi, Matsumoto, Nagano, 390-8621, Japan
| | - Koji Hashimoto
- Department of Nephrology, Shinshu University School of Medicine, 3-1-1 Asahi, Matsumoto, Nagano, 390-8621, Japan
| | - Ran Guo
- Department of Metabolic Regulation, Shinshu University School of Medicine, 3-1-1 Asahi, Matsumoto, Nagano, 390-8621, Japan
| | - Takero Nakajima
- Department of Metabolic Regulation, Shinshu University School of Medicine, 3-1-1 Asahi, Matsumoto, Nagano, 390-8621, Japan
- Research Center for Agricultural Food Industry, Shinshu University, 4-17-1 Wakasato, Nagano, Nagano, 380-8553, Japan
| | - Toshihide Kashihara
- Department of Molecular Pharmacology, Shinshu University School of Medicine, 3-1-1 Asahi, Matsumoto, Nagano, 390-8621, Japan
| | - Mitsuhiko Yamada
- Department of Molecular Pharmacology, Shinshu University School of Medicine, 3-1-1 Asahi, Matsumoto, Nagano, 390-8621, Japan
| | - Toshifumi Aoyama
- Department of Metabolic Regulation, Shinshu University School of Medicine, 3-1-1 Asahi, Matsumoto, Nagano, 390-8621, Japan
| | - Yuji Kamijo
- Department of Metabolic Regulation, Shinshu University School of Medicine, 3-1-1 Asahi, Matsumoto, Nagano, 390-8621, Japan.
- Department of Nephrology, Shinshu University School of Medicine, 3-1-1 Asahi, Matsumoto, Nagano, 390-8621, Japan.
| |
Collapse
|
22
|
Zhang H, Kashihara T, Nakada T, Tanaka S, Ishida K, Fuseya S, Kawagishi H, Kiyosawa K, Kawamata M, Yamada M. Prostanoid EP4 Receptor-Mediated Augmentation of I h Currents in A β Dorsal Root Ganglion Neurons Underlies Neuropathic Pain. J Pharmacol Exp Ther 2018; 368:50-58. [PMID: 30409832 DOI: 10.1124/jpet.118.252767] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/08/2018] [Accepted: 11/05/2018] [Indexed: 11/22/2022] Open
Abstract
An injury of the somatosensory system causes neuropathic pain, which is usually refractory to conventional analgesics, thus warranting the development of novel drugs against this kind of pain. The mechanism of neuropathic pain in rats that had undergone left L5 spinal nerve transection was analyzed. Ten days after surgery, these rats acquired neuropathic pain. The patch-clamp technique was used on the isolated bilateral L5 dorsal root ganglion neurons. The current-clamped neurons on the ipsilateral side exhibited significantly higher excitability than those on the contralateral side. However, only neurons with diameters of 40-50 μm on the ipsilateral side exhibited significantly larger voltage sags in response to hyperpolarizing current pulses than those on the contralateral side. Under the voltage clamp, only these neurons on the ipsilateral side showed a significantly larger density of an inward current at < -80 mV [hyperpolarization-activated nonselective cation (I h) current] with a rightward-shifted activation curve than that on the contralateral side. Ivabradine-an I h current inhibitor-inhibited I h currents in these neurons on both sides in a similar concentration-dependent manner, with an IC50 value of ∼3 μM. Moreover, the oral administration of ivabradine significantly alleviated the neuropathic pain on the ipsilateral side. An inhibitor of adenylyl cyclase or an antagonist of prostanoid EP4 receptors (CJ-023423) inhibited ipsilateral, but not contralateral I h, currents in these neurons. Furthermore, the intrathecal administration of CJ-023423 significantly attenuated neuropathic pain on the ipsilateral side. Thus, ivabradine and/or CJ-023423 may be a lead compound for the development of novel therapeutics against neuropathic pain.
Collapse
Affiliation(s)
- Hao Zhang
- Departments of Molecular Pharmacology (H.Z., T.K., T.N., H.K., K.K., M.Y.) and Anesthesiology and Resuscitology (H.Z., S.T., K.I., S.F., K.K., M.K.), Shinshu University School of Medicine, Matsumoto, Nagano, Japan
| | - Toshihide Kashihara
- Departments of Molecular Pharmacology (H.Z., T.K., T.N., H.K., K.K., M.Y.) and Anesthesiology and Resuscitology (H.Z., S.T., K.I., S.F., K.K., M.K.), Shinshu University School of Medicine, Matsumoto, Nagano, Japan
| | - Tsutomu Nakada
- Departments of Molecular Pharmacology (H.Z., T.K., T.N., H.K., K.K., M.Y.) and Anesthesiology and Resuscitology (H.Z., S.T., K.I., S.F., K.K., M.K.), Shinshu University School of Medicine, Matsumoto, Nagano, Japan
| | - Satoshi Tanaka
- Departments of Molecular Pharmacology (H.Z., T.K., T.N., H.K., K.K., M.Y.) and Anesthesiology and Resuscitology (H.Z., S.T., K.I., S.F., K.K., M.K.), Shinshu University School of Medicine, Matsumoto, Nagano, Japan
| | - Kumiko Ishida
- Departments of Molecular Pharmacology (H.Z., T.K., T.N., H.K., K.K., M.Y.) and Anesthesiology and Resuscitology (H.Z., S.T., K.I., S.F., K.K., M.K.), Shinshu University School of Medicine, Matsumoto, Nagano, Japan
| | - Satoshi Fuseya
- Departments of Molecular Pharmacology (H.Z., T.K., T.N., H.K., K.K., M.Y.) and Anesthesiology and Resuscitology (H.Z., S.T., K.I., S.F., K.K., M.K.), Shinshu University School of Medicine, Matsumoto, Nagano, Japan
| | - Hiroyuki Kawagishi
- Departments of Molecular Pharmacology (H.Z., T.K., T.N., H.K., K.K., M.Y.) and Anesthesiology and Resuscitology (H.Z., S.T., K.I., S.F., K.K., M.K.), Shinshu University School of Medicine, Matsumoto, Nagano, Japan
| | - Kenkichi Kiyosawa
- Departments of Molecular Pharmacology (H.Z., T.K., T.N., H.K., K.K., M.Y.) and Anesthesiology and Resuscitology (H.Z., S.T., K.I., S.F., K.K., M.K.), Shinshu University School of Medicine, Matsumoto, Nagano, Japan
| | - Mikito Kawamata
- Departments of Molecular Pharmacology (H.Z., T.K., T.N., H.K., K.K., M.Y.) and Anesthesiology and Resuscitology (H.Z., S.T., K.I., S.F., K.K., M.K.), Shinshu University School of Medicine, Matsumoto, Nagano, Japan
| | - Mitsuhiko Yamada
- Departments of Molecular Pharmacology (H.Z., T.K., T.N., H.K., K.K., M.Y.) and Anesthesiology and Resuscitology (H.Z., S.T., K.I., S.F., K.K., M.K.), Shinshu University School of Medicine, Matsumoto, Nagano, Japan
| |
Collapse
|
23
|
Guo X, Kashihara T, Nakada T, Aoyama T, Yamada M. PDGF-induced migration of synthetic vascular smooth muscle cells through c-Src-activated L-type Ca 2+ channels with full-length Ca V1.2 C-terminus. Pflugers Arch 2018; 470:909-921. [PMID: 29441404 DOI: 10.1007/s00424-018-2114-3] [Citation(s) in RCA: 5] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/06/2017] [Revised: 01/06/2018] [Accepted: 01/19/2018] [Indexed: 01/22/2023]
Abstract
In atherosclerosis, vascular smooth muscle cells (VSMC) migrate from the media toward the intima of the arteries in response to cytokines, such as platelet-derived growth factor (PDGF). However, molecular mechanism underlying the PDGF-induced migration of VSMCs remains unclear. The migration of rat aorta-derived synthetic VSMCs, A7r5, in response to PDGF was potently inhibited by a CaV1.2 channel inhibitor, nifedipine, and a Src family tyrosine kinase (SFK)/Abl inhibitor, bosutinib, in a less-than-additive manner. PDGF significantly increased CaV1.2 channel currents without altering CaV1.2 protein expression levels in A7r5 cells. This reaction was inhibited by C-terminal Src kinase, a selective inhibitor of SFKs. In contractile VSMCs, the C-terminus of CaV1.2 is proteolytically cleaved into proximal and distal C-termini (PCT and DCT, respectively). Clipped DCT is noncovalently reassociated with PCT to autoinhibit the channel activity. Conversely, in synthetic A7r5 cells, full-length CaV1.2 (CaV1.2FL) is expressed much more abundantly than truncated CaV1.2. In a heterologous expression system, c-Src activated CaV1.2 channels composed of CaV1.2FL but not truncated CaV1.2 (CaV1.2Δ1763) or CaV1.2Δ1763 plus clipped DCT. Further, c-Src enhanced the coupling efficiency between the voltage-sensing domain and activation gate of CaV1.2FL channels by phosphorylating Tyr1709 and Tyr1758 in PCT. Compared with CaV1.2Δ1763, c-Src could more efficiently bind to and phosphorylate CaV1.2FL irrespective of the presence or absence of clipped DCT. Therefore, in atherosclerotic lesions, phenotypic switching of VSMCs may facilitate pro-migratory effects of PDGF on VSMCs by suppressing posttranslational CaV1.2 modifications.
Collapse
Affiliation(s)
- Xiaoguang Guo
- Department of Molecular Pharmacology, Shinshu University School of Medicine, 3-1-1 Asahi, Matsumoto, Nagano, 390-8621, Japan.,Department of Metabolic Regulation, Institute on Aging and Adaptation, Shinshu University Graduate School of Medicine, Matsumoto, Nagano, Japan
| | - Toshihide Kashihara
- Department of Molecular Pharmacology, Shinshu University School of Medicine, 3-1-1 Asahi, Matsumoto, Nagano, 390-8621, Japan
| | - Tsutomu Nakada
- Department of Molecular Pharmacology, Shinshu University School of Medicine, 3-1-1 Asahi, Matsumoto, Nagano, 390-8621, Japan
| | - Toshifumi Aoyama
- Department of Metabolic Regulation, Institute on Aging and Adaptation, Shinshu University Graduate School of Medicine, Matsumoto, Nagano, Japan
| | - Mitsuhiko Yamada
- Department of Molecular Pharmacology, Shinshu University School of Medicine, 3-1-1 Asahi, Matsumoto, Nagano, 390-8621, Japan.
| |
Collapse
|
24
|
Kashihara T, Nakada T, Kojima K, Takeshita T, Yamada M. Angiotensin II activates Ca V 1.2 Ca 2+ channels through β-arrestin2 and casein kinase 2 in mouse immature cardiomyocytes. J Physiol 2017; 595:4207-4225. [PMID: 28295363 DOI: 10.1113/jp273883] [Citation(s) in RCA: 27] [Impact Index Per Article: 3.9] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/06/2016] [Accepted: 03/10/2017] [Indexed: 12/25/2022] Open
Abstract
KEY POINTS Angiotensin II (AngII) is crucial in cardiovascular regulation in perinatal mammalians. Here we show that AngII increases twitch Ca2+ transients of mouse immature but not mature cardiomyocytes by robustly activating CaV 1.2 L-type Ca2+ channels through a novel signalling pathway involving angiotensin type 1 (AT1 ) receptors, β-arrestin2 and casein kinase 2. A β-arrestin-biased AT1 receptor agonist, TRV027, was as effective as AngII in activating L-type Ca2+ channels. Our results help understand the molecular mechanism by which AngII regulates the perinatal circulation and also suggest that β-arrestin-biased AT1 receptor agonists may be valuable therapeutics for paediatric heart failure. ABSTRACT Angiotensin II (AngII), the main effector peptide of the renin-angiotensin system, plays important roles in cardiovascular regulation in the perinatal period. Despite the well-known stimulatory effect of AngII on vascular contraction, little is known about regulation of contraction of the immature heart by AngII. Here we found that AngII significantly increased the peak amplitude of twitch Ca2+ transients by robustly activating L-type CaV 1.2 Ca2+ (CaV 1.2) channels in mouse immature but not mature cardiomyocytes. This response to AngII was mediated by AT1 receptors and β-arrestin2. A β-arrestin-biased AT1 receptor agonist was as effective as AngII in activating CaV 1.2 channels. Src-family tyrosine kinases (SFKs) and casein kinase 2α'β (CK2α'β) were sequentially activated when AngII activated CaV 1.2 channels. A cyclin-dependent kinase inhibitor, p27Kip1 (p27), inhibited CK2α'β, and AngII removed this inhibitory effect through phosphorylating tyrosine 88 of p27 via SFKs in cardiomyocytes. In a human embryonic kidney cell line, tsA201 cells, overexpression of CK2α'β but not c-Src directly activated recombinant CaV 1.2 channels composed of C-terminally truncated α1C , the distal C-terminus of α1C , β2C and α2 δ1 subunits, by phosphorylating threonine 1704 located at the interface between the proximal and the distal C-terminus of CaV 1.2α1C subunits. Co-immunoprecipitation revealed that CaV 1.2 channels, CK2α'β and p27 formed a macromolecular complex. Therefore, stimulation of AT1 receptors by AngII activates CaV 1.2 channels through β-arrestin2 and CK2α'β, thereby probably exerting a positive inotropic effect in the immature heart. Our results also indicated that β-arrestin-biased AT1 receptor agonists may be used as valuable therapeutics for paediatric heart failure in the future.
Collapse
Affiliation(s)
- Toshihide Kashihara
- Department of Molecular Pharmacology, Shinshu University School of Medicine, Matsumoto, Nagano, Japan
| | - Tsutomu Nakada
- Department of Molecular Pharmacology, Shinshu University School of Medicine, Matsumoto, Nagano, Japan
| | - Katsuhiko Kojima
- Department of Microbiology and Immunology, Shinshu University School of Medicine, Matsumoto, Nagano, Japan
| | - Toshikazu Takeshita
- Department of Microbiology and Immunology, Shinshu University School of Medicine, Matsumoto, Nagano, Japan
| | - Mitsuhiko Yamada
- Department of Molecular Pharmacology, Shinshu University School of Medicine, Matsumoto, Nagano, Japan
| |
Collapse
|
25
|
Nakada T, Kashihara T, Yamada M. Interaction of Junctophilins and the C-Terminus of Ca v 1.1 Subunits Regulates Localization and Function of L-Type Calcium Channels in Skeletal Muscle. Biophys J 2017. [DOI: 10.1016/j.bpj.2016.11.570] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/20/2022] Open
|
26
|
Sekii S, Murakami N, Nakamura S, Kashihara T, Kobayashi K, Harada K, Kitaguchi M, Takahashi K, Inaba K, Igaki H, Ito Y, Itami J. Supplementary Bladder Reference Point of High-Dose-Rate Intracavitary Brachytherapy for Cervical Cancer: Feedback 3-Dimension to 2-Dimension. Int J Radiat Oncol Biol Phys 2016. [DOI: 10.1016/j.ijrobp.2016.06.1401] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/16/2022]
|
27
|
Ito Y, Murakami N, Inaba K, Takahashi K, Umezawa R, Igaki H, Sekii S, Harada K, Kitaguchi M, Kobayashi K, Kashihara T, Yoshimoto S, Itami J. Treatment Outcomes of Intensity Modulated Radiation Therapy for Clinical Stage I/II Hypopharyngeal Cancer. Int J Radiat Oncol Biol Phys 2015. [DOI: 10.1016/j.ijrobp.2015.07.1435] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/25/2022]
|
28
|
Gautam M, Fujita D, Kimura K, Ichikawa H, Izawa A, Hirose M, Kashihara T, Yamada M, Takahashi M, Ikeda U, Shiba Y. Transplantation of adipose tissue-derived stem cells improves cardiac contractile function and electrical stability in a rat myocardial infarction model. J Mol Cell Cardiol 2015; 81:139-49. [PMID: 25724725 DOI: 10.1016/j.yjmcc.2015.02.012] [Citation(s) in RCA: 23] [Impact Index Per Article: 2.6] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 08/31/2014] [Revised: 02/11/2015] [Accepted: 02/13/2015] [Indexed: 01/08/2023]
Abstract
The transplantation of adipose tissue-derived stem cells (ADSCs) improves cardiac contractility after myocardial infarction (MI); however, little is known about the electrophysiological consequences of transplantation. The purpose of this study was to clarify whether the transplantation of ADSCs increases or decreases the incidence of ventricular tachyarrhythmias (VT) in a rat model of MI. MI was induced experimentally by permanent occlusion of the left anterior descending artery of Lewis rats. ADSCs were harvested from GFP-transgenic rats, and were cultured until passage four. ADSCs (10×10(6)) resuspended in 100μL saline or pro-survival cocktail (PSC), which enhances cardiac graft survival, were injected directly into syngeneic rat hearts 1week after MI. The recipients of ADSCs suspended in PSC had a larger graft area compared with those receiving ASDCs suspended in saline at 1week post-transplantation (number of graft cells/section: 148.7±10.6 vs. 22.4±3.4, p<0.05, n=5/group). Thereafter, all ADSC recipients were transplanted with ASDCs in PSC. ADSCs were transplanted into infarcted hearts, and the mechanical and electrophysiological functions were assessed. Echocardiography revealed that ADSC recipients had improved contractile function compared with those receiving PSC vehicle (fractional shortening: 21.1±0.9 vs. 14.1±1.2, p<0.05, n≥12/group). Four weeks post-transplantation, VT was induced via in vivo programmed electrical stimulation. The recipients of ADSCs showed a significantly lower incidence of induced VT compared with the control (31.3% vs. 83.3%, p<0.05, n≥12/group). To understand the electrical activity following transplantation, we performed ex vivo optical mapping using a voltage sensitive dye, and found that ADSC transplantation decreased conduction velocity and its dispersion in the peri-infarct area. These results suggest that ADSC transplantation improved cardiac mechanical and electrophysiological functions in subacute MI.
Collapse
Affiliation(s)
- Milan Gautam
- Department of Cardiovascular Medicine, Shinshu University, Matsumoto, Japan
| | - Daiki Fujita
- Department of Anatomy and Organ Technology, Shinshu University, Matsumoto, Japan; Department of Biotechnology and Biomedical Engineering, Institute for Biomedical Sciences, Shinshu University, Matsumoto, Japan
| | - Kazuhiro Kimura
- Department of Cardiovascular Medicine, Shinshu University, Matsumoto, Japan
| | - Hinako Ichikawa
- Department of Cardiovascular Medicine, Shinshu University, Matsumoto, Japan
| | - Atsushi Izawa
- Department of Cardiovascular Medicine, Shinshu University, Matsumoto, Japan
| | - Masamichi Hirose
- Department of Molecular and Cellular Pharmacology, Iwate Medical University, Iwate, Japan
| | | | | | - Masafumi Takahashi
- Division of Inflammation Research, Center for Molecular Medicine, Jichi Medical University, Tochigi, Japan
| | - Uichi Ikeda
- Department of Cardiovascular Medicine, Shinshu University, Matsumoto, Japan
| | - Yuji Shiba
- Department of Cardiovascular Medicine, Shinshu University, Matsumoto, Japan; Department of Biotechnology and Biomedical Engineering, Institute for Biomedical Sciences, Shinshu University, Matsumoto, Japan.
| |
Collapse
|
29
|
Hirose M, Shibazaki T, Nakada T, Kashihara T, Yano S, Okamoto Y, Isaji M, Matsushita N, Taira E, Yamada M. Phlorizin prevents electrically-induced ventricular tachyarrhythmia during ischemia in langendorff-perfused guinea-pig hearts. Biol Pharm Bull 2015; 37:1168-76. [PMID: 24989008 DOI: 10.1248/bpb.b14-00046] [Citation(s) in RCA: 11] [Impact Index Per Article: 1.2] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/22/2022]
Abstract
Phlorizin is a type of flavonoids and has a peroxynitrite scavenging effect. This study aimed to elucidate the effects of phlorizin on ischemia-induced ventricular tachyarrhythmia (VT). Optical signals from the epicardial surface of the ventricle or left ventricular end diastolic pressure (LVEDP) were recorded during acute global ischemia in 42 Langendorff-perfused guinea pig hearts. Experiments were performed in the control condition and in the presence of phlorizin or N-2-mercaptopropionylglycine (2-MPG), a peroxynitrite scavenger, respectively. Mean action potential duration at 20 min of ischemia did not differ among the three interventions. Impulse conduction time-dependently slowed during 20 min of ischemia in the control. Phlorizin but not 2-MPG improved the ischemic conduction slowing at 15 and 20 min of ischemia. Programmed stimulation induced VT at 20 min of ischemia in the control and in the presence of 2-MPG but not in the presence of phlorizin (p<0.05). LVEDP was increased during 30 min of ischemia in the control and in the presence of 2-MPG but not in the presence of phlorizin. These results indicate that phlorizin prevents VT through the improvement of impulse conduction slowing during ischemia. Phlorizin may be more useful for ischemia-induced VT than 2-MPG.
Collapse
Affiliation(s)
- Masamichi Hirose
- Department of Molecular and Cellular Pharmacology, Iwate Medical University School of Pharmaceutical Sciences
| | | | | | | | | | | | | | | | | | | |
Collapse
|
30
|
Kashihara T, Hirose M, Shimojo H, Nakada T, Gomi S, Hongo M, Yamada M. β(2)-Adrenergic and M(2)-muscarinic receptors decrease basal t-tubular L-type Ca2+ channel activity and suppress ventricular contractility in heart failure. Eur J Pharmacol 2013; 724:122-31. [PMID: 24389135 DOI: 10.1016/j.ejphar.2013.12.037] [Citation(s) in RCA: 7] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/17/2013] [Revised: 11/29/2013] [Accepted: 12/15/2013] [Indexed: 01/01/2023]
Abstract
L-type Ca(2+) channels (LTCC) play a crucial role in cardiac excitation-contraction coupling. We previously found that in failing ventricular myocytes of mice chronically treated with isoproterenol, basal t-tubular (TT) LTCC activity was halved by activation of protein phosphatase (PP)2A whereas basal surface sarcolemmal (SS) LTCC activity was doubled by inhibition of PP1. Interestingly, chronic treatment of these mice with pertussis toxin almost completely normalized TT and SS LTCC densities and cardiac contractility. In the present study, we therefore sought to identify the Gi/o protein-coupled receptors in cardiac myocytes (i.e. β2-adrenergic, M2-muscarinic and A1-adenosine receptors) that are responsible for these abnormalities in heart failure by chronically administrating mice a selective antagonist of each receptor (ICI118,551, atropine and 8-cyclopentyl-1,3-dipropilxanthine (DPCPX), respectively) with isoproterenol. Compared with mice treated with isoproterenol alone, mice treated with isoproterenol plus ICI118,551 or atropine, but not DPCPX showed significantly lower lung weight/tibial length, higher fractional shortening, lower left ventricular end-diastolic pressure and higher dP/dtmax and dP/dtmin. In addition, ventricular myocytes of mice treated with isoproterenol plus ICI118,551 or atropine, but not DPCPX exhibited significantly higher TT and lower SS LTCC current densities than those of mice treated with isoproterenol alone due to normalization of the PP activities. These results indicate that β2-adrenergic, M2-muscarinic, but not A1-adenosine receptors contribute to reduced ventricular contractility at least partially by decreasing basal TT LTCC activity in heart failure. Therefore, antagonists of β2-adrenergic and/or M2-muscarinic receptors can be good adjuncts to β1-adrenergic receptor antagonists in the treatment of heart failure.
Collapse
Affiliation(s)
- Toshihide Kashihara
- Department of Molecular Pharmacology, Shinshu University School of Medicine, 3-1-1 Asahi, Matsumoto, Nagano 390-8621, Japan
| | - Masamichi Hirose
- Department of Molecular and Cellular Pharmacology, School of Pharmaceutical Sciences, Iwate Medical University, Morioka, Iwate, Japan
| | - Hisashi Shimojo
- Department of Pathology, Shinshu University School of Medicine, Matsumoto, Nagano, Japan
| | - Tsutomu Nakada
- Department of Molecular Pharmacology, Shinshu University School of Medicine, 3-1-1 Asahi, Matsumoto, Nagano 390-8621, Japan
| | - Simmon Gomi
- Department of Molecular Pharmacology, Shinshu University School of Medicine, 3-1-1 Asahi, Matsumoto, Nagano 390-8621, Japan; Department of Cardiovascular Medicine, Shinshu University School of Medicine, Matsumoto, Nagano, Japan
| | - Minoru Hongo
- Department of Cardiovascular Medicine, Shinshu University School of Health Science, Matsumoto, Nagano, Japan
| | - Mitsuhiko Yamada
- Department of Molecular Pharmacology, Shinshu University School of Medicine, 3-1-1 Asahi, Matsumoto, Nagano 390-8621, Japan.
| |
Collapse
|
31
|
Matsushita N, hirose M, Taeishi Y, Suzuki S, Kashihara T, Mende U, Taira E, Yamada M. Abstract 037: Transient Cardiac Expression Of Constitutively Active G alpha Q Activates Renin-angiotensin System, Leading To Progressive Heart Failure And Ventricular Arrhythmias In Transgenic Mice. Circ Res 2013. [DOI: 10.1161/res.113.suppl_1.a037] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Indexed: 11/16/2022]
Abstract
Introduction:
Transgenic mice with transient cardiac expression of constitutively active Galpha q (Gαq-TG) caused progressive heart failure and ventricular arrhythmias after the initiating stimulus becomes undetectable. However, the mechanisms are still unknown. Renin-angiotensin system plays a critical role in the development of cardiac hypertrophy and heart failure. We examined the effects of chronic administration of olmesartan on ventricular function, the number of premature ventricular contractions (PVC), and ventricular remodeling in Gαq-TG mice.
Methods and Results:
Olmesartan (1 mg/kg/day) or vehicle was chronically administered to Gαq-TG from 6 to 32 weeks of age, and all experiments were performed in mice at the age of 32 weeks. Chronic olmesartan treatment prevented the severe reduction of left ventricular fractional shortening and inhibited ventricular interstitial fibrosis and ventricular myocyte hypertrophy in Gαq-TG. Electrocardiogram demonstrated that premature ventricular contraction (PVC) was frequently (more than 20 beats/min) observed in 9 of 10 vehicle-treated Gαq-TG but in none of 10 olmesartan -treated Gαq-TG. The QT interval was significantly shorter in olmesartan-treated Gαq-TG than vehicle-treated Gαq-TG. CTGF, collagen type 1, ANP, BNP, and β-MHC gene expression was increased in vehicle-treated Gαq-TG. Olmesartan significantly decreased these gene expressions in Gαq-TG. Moreover, protein expressions of canonical transient receptor potential (TRPC) channels 3 and 6 increased in vehicle-treated Gαq-TG hearts. Olmesartan significantly decreased TRPC6 expressions in Gαq-TG. Angiotensin converting enzyme (ACE) 1 and 2 gene expressions were also increased in vehicle-treated Gαq-TG and was not decreased to the control level in olmesartan-treated Gαq-TG.
Conclusions:
These findings suggest that renin-angiotensin system has an important role in the development of cardiac hypertrophy and heart failure even if the initiating stimulus is different from the activation of renin-angiotensin system.
Collapse
|
32
|
Yoshizawa T, Sakurai T, Kamiyoshi A, Ichikawa-Shindo Y, Kawate H, Iesato Y, Koyama T, Uetake R, Yang L, Yamauchi A, Tanaka M, Toriyama Y, Igarashi K, Nakada T, Kashihara T, Yamada M, Kawakami H, Nakanishi H, Taguchi R, Nakanishi T, Akazawa H, Shindo T. Novel regulation of cardiac metabolism and homeostasis by the adrenomedullin-receptor activity-modifying protein 2 system. Hypertension 2013; 61:341-51. [PMID: 23297372 DOI: 10.1161/hypertensionaha.111.00647] [Citation(s) in RCA: 19] [Impact Index Per Article: 1.7] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/18/2022]
Abstract
Adrenomedullin (AM) was identified as a vasodilating and hypotensive peptide mainly produced by the cardiovascular system. The AM receptor calcitonin receptor-like receptor associates with receptor activity-modifying protein (RAMP), one of the subtypes of regulatory proteins. Among knockout mice ((-/-)) of RAMPs, only RAMP2(-/-) is embryonically lethal with cardiovascular abnormalities that are the same as AM(-/-). This suggests that the AM-RAMP2 system is particularly important for the cardiovascular system. Although AM and RAMP2 are highly expressed in the heart from embryo to adulthood, their analysis has been limited by the embryonic lethality of AM(-/-) and RAMP2(-/-). For this study, we generated inducible cardiac myocyte-specific RAMP2(-/-) (C-RAMP2(-/-)). C-RAMP2(-/-) exhibited dilated cardiomyopathy-like heart failure with cardiac dilatation and myofibril disruption. C-RAMP2(-/-) hearts also showed changes in mitochondrial structure and downregulation of mitochondria-related genes involved in oxidative phosphorylation, β-oxidation, and reactive oxygen species regulation. Furthermore, the heart failure was preceded by changes in peroxisome proliferator-activated receptor-γ coactivator 1α (PGC-1α), a master regulator of mitochondrial biogenesis. Metabolome and matrix-assisted laser desorption/ionization-time-of-flight mass spectrometry (MALDI-TOF-MS) imaging analyses revealed early downregulation of cardiolipin, a mitochondrial membrane-specific lipid. Furthermore, primary-cultured cardiac myocytes from C-RAMP2(-/-) showed reduced mitochondrial membrane potential and enhanced reactive oxygen species production in a RAMP2 deletion-dependent manner. C-RAMP2(-/-) showed downregulated activation of cAMP response element binding protein (CREB), one of the main regulators of mitochondria-related genes. These data demonstrate that the AM-RAMP2 system is essential for cardiac metabolism and homeostasis. The AM-RAMP2 system is a promising therapeutic target of heart failure.
Collapse
Affiliation(s)
- Takahiro Yoshizawa
- Department of Cardiovascular Research, Shinshu University Graduate School of Medicine, Asahi 3-1-1, Matsumoto, Nagano, 390-8621, Japan
| | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | |
Collapse
|
33
|
Hirose M, Takeishi Y, Nakada T, Shimojo H, Kashihara T, Nishio A, Suzuki S, Mende U, Matsumoto K, Matsushita N, Taira E, Sato F, Yamada M. Nicorandil prevents Gαq-induced progressive heart failure and ventricular arrhythmias in transgenic mice. PLoS One 2012; 7:e52667. [PMID: 23285142 PMCID: PMC3527603 DOI: 10.1371/journal.pone.0052667] [Citation(s) in RCA: 9] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/29/2011] [Accepted: 11/19/2012] [Indexed: 11/19/2022] Open
Abstract
BACKGROUND Beneficial effects of nicorandil on the treatment of hypertensive heart failure (HF) and ischemic heart disease have been suggested. However, whether nicorandil has inhibitory effects on HF and ventricular arrhythmias caused by the activation of G protein alpha q (Gα(q)) -coupled receptor (GPCR) signaling still remains unknown. We investigated these inhibitory effects of nicorandil in transgenic mice with transient cardiac expression of activated Gα(q) (Gα(q)-TG). METHODOLOGY/PRINCIPAL FINDINGS Nicorandil (6 mg/kg/day) or vehicle was chronically administered to Gα(q)-TG from 8 to 32 weeks of age, and all experiments were performed in mice at the age of 32 weeks. Chronic nicorandil administration prevented the severe reduction of left ventricular fractional shortening and inhibited ventricular interstitial fibrosis in Gα(q)-TG. SUR-2B and SERCA2 gene expression was decreased in vehicle-treated Gα(q)-TG but not in nicorandil-treated Gα(q)-TG. eNOS gene expression was also increased in nicorandil-treated Gα(q)-TG compared with vehicle-treated Gα(q)-TG. Electrocardiogram demonstrated that premature ventricular contraction (PVC) was frequently (more than 20 beats/min) observed in 7 of 10 vehicle-treated Gα(q)-TG but in none of 10 nicorandil-treated Gα(q)-TG. The QT interval was significantly shorter in nicorandil-treated Gα(q)-TG than vehicle-treated Gα(q)-TG. Acute nicorandil administration shortened ventricular monophasic action potential duration and reduced the number of PVCs in Langendorff-perfused Gα(q)-TG mouse hearts. Moreover, HMR1098, a blocker of cardiac sarcolemmal K(ATP) channels, significantly attenuated the shortening of MAP duration induced by nicorandil in the Gα(q)-TG heart. CONCLUSIONS/SIGNIFICANCE These findings suggest that nicorandil can prevent the development of HF and ventricular arrhythmia caused by the activation of GPCR signaling through the shortening of the QT interval, action potential duration, the normalization of SERCA2 gene expression. Nicorandil may also improve the impaired coronary circulation during HF.
Collapse
Affiliation(s)
- Masamichi Hirose
- Department of Molecular and Cellular Pharmacology, Iwate Medical University School of Pharmaceutical Sciences, Shiwa, Iwate, Japan.
| | | | | | | | | | | | | | | | | | | | | | | | | |
Collapse
|
34
|
Kashihara T, Nakada T, Shimojo H, Horiuchi-Hirose M, Gomi S, Shibazaki T, Sheng X, Hirose M, Hongo M, Yamada M. Chronic receptor-mediated activation of Gi/o proteins alters basal t-tubular and sarcolemmal L-type Ca2+ channel activity through phosphatases in heart failure. Am J Physiol Heart Circ Physiol 2012; 302:H1645-54. [DOI: 10.1152/ajpheart.00589.2011] [Citation(s) in RCA: 12] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Indexed: 11/22/2022]
Abstract
L-type Ca2+ channels (LTCCs) play an essential role in the excitation-contraction coupling of ventricular myocytes. We previously found that t-tubular (TT) LTCC current density was halved by the activation of protein phosphatase (PP)1 and/or PP2A, whereas surface sarcolemmal (SS) LTCC current density was increased by the inhibition of PP1 and/or PP2A activity in failing ventricular myocytes of mice chronically treated with isoproterenol (ISO mice). In the present study, we examined the possible involvement of inhibitory heterotrimeric G proteins (Gi/o) in these abnormalities by chronically administrating pertussis toxin (PTX) to ISO mice (ISO + PTX mice). Compared with ISO mice, ISO + PTX mice exhibited significantly higher fractional shortening of the left ventricle. The expression level of Gαi2 proteins was not altered by the treatment of mice with ISO and/or PTX. ISO + PTX myocytes had normal TT and SS LTCC current densities because they had higher and lower availability and/or open probability of TT and SS LTCCs than ISO myocytes, respectively. A selective PKA inhibitor, H-89, did not affect LTCC current densities in ISO + PTX myocytes. A selective PP2A inhibitor, fostriecin, did not affect SS or TT current density in control or ISO + PTX myocytes but significantly increased TT but not SS LTCC current density in ISO myocytes. These results indicate that chronic receptor-mediated activation of Gi/o in vivo decreases basal TT LTCC activity by activating PP2A and increases basal SS LTCC activity by inhibiting PP1 without modulating PKA in heart failure.
Collapse
Affiliation(s)
| | | | | | | | - Simmon Gomi
- Departments of Molecular Pharmacology,
- Cardiovascular Medicine, Shinshu University School of Medicine, Nagano
| | - Toshihide Shibazaki
- Departments of Molecular Pharmacology,
- Discovery Research Laboratory II, Research and Development, Kissei Pharmaceutical Company, Limited, Azumino, Nagano
| | - Xiaona Sheng
- Departments of Molecular Pharmacology,
- Department of Metabolic Regulation, Institute on Aging and Adaptation, Shinshu University Graduate School of Medicine, Nagano
| | - Masamichi Hirose
- Department of Molecular and Cellular Pharmacology, School of Pharmaceutical Sciences, Iwate Medical University, Iwate; and
| | - Minoru Hongo
- Department of Cardiovascular Medicine, Shinshu University School of Health Science, Nagano, Japan
| | | |
Collapse
|
35
|
Hirose M, Takeishi Y, Shimojo H, Kashihara T, Nakada T, Mende U, Yamada M. Abstract P170: Nicorandil Inhibits Gáq-Induced Chronic Heart Failure in Transgenic Mice. Circ Res 2011. [DOI: 10.1161/res.109.suppl_1.ap170] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Indexed: 11/16/2022]
Abstract
Introduction:
Beneficial effects of nicorandil on the treatment of hypertensive heart failure (HF) and ischemic heart disease have been suggested. However, whether nicorandil has inhibitory effects on HF and ventricular arrhythmias caused by the activation of G protein alpha q (Gαq) -coupled receptor (GPCR) signaling pathway still remains unknown. We examined effects of chronic and acute administration of nicorandil on the development of HF and ventricular action potential (VAP) in transgenic mice with transient cardiac expression of activated Gαq (Gαq-TG), respectively.
Method and Results:
Nicorandil (6 mg/kg/day) or vehicle was chronically administered in Gαq-TG mice for 24 weeks from 8 weeks of age, and then ventricular function, and electrical and structural changes were investigated in the hearts. Chronic nicorandil administration improved the reduction of left ventricular fractional shortening (p < 0.001) in Gαq-TG hearts. During 10 min of electrocardiogram recording, premature ventricular contractions (more than 20 beats/min) were observed in 7 of 10 vehicle-treated Gαq-TG but in none of 10 nicorandil-treated Gαq-TG hearts (p < 0.01). QT interval was significantly shorter in nicorandil-treated Gαq-TG than in vehicle-treated Gαq-TG hearts (p < 0.05). Chronic nicorandil administration improved the increased ventricular interstitial fibrosis (p < 0.05) but not cardiac hypertrophy in Gαq-TG left ventricles. Real time RT-PCR revealed that mRNA expression levels of s sulfonylurea receptor 2B (SUR-2B) were decreased in vehicle-treatd Gαq-TG but not in nicorandil-treated Gαq-TG. In addition, chronic nicorandil increased endotherial nitric oxide syntheses gene expression in Gαq-TG hearts (p < 0.05). Acute nicorandil administration (1 microM) significantly shortened the prolonged VAP duration and reduced the number of PVCs in vehicle treated Gαq-TG hearts.
Conclusions:
These findings suggest that nicorandil inhibits ventricular electrical and structural remodeling and arrhythmias through the shortening of VAP duration and the increased expression of SUR-2B and eNOS in a mouse model of HF.
Collapse
|
36
|
Hirose M, Takeishi Y, Niizeki T, Nakada T, Shimojo H, Kashihara T, Horiuchi-Hirose M, Kubota I, Mende U, Yamada M. Diacylglycerol kinase ζ inhibits ventricular tachyarrhythmias in a mouse model of heart failure. Circ J 2011; 75:2333-42. [PMID: 21778596 DOI: 10.1253/circj.cj-10-1213] [Citation(s) in RCA: 15] [Impact Index Per Article: 1.2] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Indexed: 11/09/2022]
Abstract
BACKGROUND Diacylglycerol kinase ζ (DGKζ) inhibited atrial tachyarrhythmias in a mouse model of heart failure (HF) in our study. However, whether DGKζ prevents the HF-induced ventricular tachyarrhythmia (VT) is unknown. METHODS AND RESULTS Effects of DGKζ on VT using transgenic mice with transient cardiac expression of activated G protein α(q) (Gα(q)-TG; model of HF) were elucidated and double transgenic mice with cardiac-specific overexpression of both DGKζ and the activated Gα(q) (Gα(q)/DGKζ-TG) were used. Premature ventricular contraction (PVC) and/or VT were frequently observed in Gα(q)-TG mice but not in Gα(q)/DGKζ-TG and wild-type (WT) mice (P<0.01). Protein expressions of canonical transient receptor potential (TRPC) channels 3 and 6 increased in Gα(q)-TG hearts compared with WT and Gα(q)/DGKζ-TG hearts. SK&F96365, a TRPC channel blocker, decreased the number of PVC and prevented VT in anesthetized Gα(q)-TG mice (P<0.05). 1-oleoyl-2-acyl-sn-glycerol (OAG), a diacylglycerol analogue, increased the number of PVC in isolated Gα(q)-TG hearts compared with WT hearts and induced VT in Gα(q)-TG hearts (P<0.01). SK&F96365 decreased the number of PVC and prevented VT in isolated Gα(q)-TG hearts (P<0.01) even in the presence of OAG. Early afterdepolarization (EAD)-induced triggered activity was frequently observed in single Gα(q)-TG ventricular myocytes. Moreover, SK&F96365 prevented the EAD. CONCLUSIONS These results demonstrated that DGKζ inhibited VT in a mouse model of HF and suggest that TRPC channels participate in VT induction in failing hearts.
Collapse
Affiliation(s)
- Masamichi Hirose
- Department of Molecular and Cellular Pharmacology, Iwate Medical University School of Pharmaceutical Science, Iwate, Japan.
| | | | | | | | | | | | | | | | | | | |
Collapse
|
37
|
Horiuchi-Hirose M, Kashihara T, Nakada T, Kurebayashi N, Shimojo H, Shibazaki T, Sheng X, Yano S, Hirose M, Hongo M, Sakurai T, Moriizumi T, Ueda H, Yamada M. Decrease in the density of t-tubular L-type Ca2+ channel currents in failing ventricular myocytes. Am J Physiol Heart Circ Physiol 2011; 300:H978-88. [DOI: 10.1152/ajpheart.00508.2010] [Citation(s) in RCA: 33] [Impact Index Per Article: 2.5] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Indexed: 01/08/2023]
Abstract
In some forms of cardiac hypertrophy and failure, the gain of Ca2+-induced Ca2+ release [CICR; i.e., the amount of Ca2+ released from the sarcoplasmic reticulum normalized to Ca2+ influx through L-type Ca2+ channels (LTCCs)] decreases despite the normal whole cell LTCC current density, ryanodine receptor number, and sarcoplasmic reticulum Ca2+ content. This decrease in CICR gain has been proposed to arise from a change in dyad architecture or derangement of the t-tubular (TT) structure. However, the activity of surface sarcolemmal LTCCs has been reported to increase despite the unaltered whole cell LTCC current density in failing human ventricular myocytes, indicating that the “decreased CICR gain” may reflect a decrease in the TT LTCC current density in heart failure. Thus, we analyzed LTCC currents of failing ventricular myocytes of mice chronically treated with isoproterenol (Iso). Although Iso-treated mice exhibited intact t-tubules and normal LTCC subunit expression, acute occlusion of t-tubules of isolated ventricular myocytes with osmotic shock (detubulation) revealed that the TT LTCC current density was halved in Iso-treated versus control myocytes. Pharmacological analysis indicated that kinases other than PKA or Ca2+/calmodulin-dependent protein kinase II insufficiently activated, whereas protein phosphatase 1/2A excessively suppressed, TT LTCCs in Iso-treated versus control myocytes. These results indicate that excessive β-adrenergic stimulation causes the decrease in TT LTCC current density by altering the regulation of TT LTCCs by protein kinases and phosphatases in heart failure. This phenomenon might underlie the decreased CICR gain in heart failure.
Collapse
Affiliation(s)
| | | | - Tsutomu Nakada
- Molecular Pharmacology, Shinshu University School of Medicine, Nagano
| | - Nagomi Kurebayashi
- Department of Pharmacology, Juntendo University School of Medicine, Tokyo
| | - Hisashi Shimojo
- Department of Pathology, Shinshu University School of Medicine, Nagano
| | | | - Xiaona Sheng
- Department of Metabolic Regulation, Institute on Aging and Adaptation, Shinshu University Graduate School of Medicine, Nagano; and
| | - Shiharu Yano
- Molecular Pharmacology, Shinshu University School of Medicine, Nagano
| | - Masamichi Hirose
- Molecular Pharmacology, Shinshu University School of Medicine, Nagano
| | | | - Takashi Sakurai
- Department of Pharmacology, Juntendo University School of Medicine, Tokyo
| | | | - Hideho Ueda
- Anatomy and Cell Biology, Shinshu University School of Health Science, Nagano, Japan
| | - Mitsuhiko Yamada
- Molecular Pharmacology, Shinshu University School of Medicine, Nagano
| |
Collapse
|
38
|
Hashizume H, Sato K, Takagi H, Kanda D, Kashihara T, Kiso S, Mori M. Werner syndrome as a possible cause of non-alcoholic steatohepatitis. J Clin Pathol 2009; 62:1043-5. [PMID: 19720629 DOI: 10.1136/jcp.2009.070680] [Citation(s) in RCA: 10] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/03/2022]
Abstract
Non-alcoholic steatohepatitis (NASH) is characterised by steatosis, liver cell injuries, the presence of a mixed inflammatory lobular infiltrate, and variable degrees of fibrosis. Werner syndrome (WS) is a rare autosomal recessive disease characterised by the premature onset of multiple age-related disorders. Central obesity and insulin resistance are common symptoms of both NASH and WS. Three cases were studied to evaluate the association between WS and NASH. NASH was diagnosed by liver biopsies and imaging studies following the exclusion of alcohol consumption, viral disease or autoimmune liver disease. Liver histology was compatible with NASH in all cases. Liver dysfunction, hyperlipidaemia, insulin resistance and regional increase of intra-abdominal fat even though the body mass indices were all normal or low, were observed. Metabolic disorders due to WS may complicate and cause NASH. Hence, the observed clinical association between WS and NASH suggests that patients with WS should also be screened for NASH.
Collapse
Affiliation(s)
- H Hashizume
- Department of Medicine and Molecular Science, Gunma University Graduate School of Medicine, Japan
| | | | | | | | | | | | | |
Collapse
|
39
|
Kashihara T, Nakayama K, Matsuda T, Baba A, Ishikawa T. Role of Na+/Ca2+ Exchanger–Mediated Ca2+ Entry in Pressure-Induced Myogenic Constriction in Rat Posterior Cerebral Arteries. J Pharmacol Sci 2009; 110:218-22. [DOI: 10.1254/jphs.09054sc] [Citation(s) in RCA: 7] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/20/2022] Open
|
40
|
Kashihara T, Goto K, Sahara Y, Nakayama K, Ishikawa T. Differential involvement of .ALPHA.1-adrenoceptors in vasoconstrictor responses to cooling in mouse plantar arteries in vitro and in vivo. J Smooth Muscle Res 2009; 45:87-95. [DOI: 10.1540/jsmr.45.87] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/13/2022] Open
Affiliation(s)
- Toshihide Kashihara
- Department of Pharmacology, Graduate School of Pharmaceutical Sciences, University of Shizuoka
| | - Kazunori Goto
- Department of Pharmacology, Graduate School of Pharmaceutical Sciences, University of Shizuoka
| | - Yoshiki Sahara
- Department of Pharmacology, Graduate School of Pharmaceutical Sciences, University of Shizuoka
| | - Koichi Nakayama
- Department of Molecular and Cellular Pharmacology, Faculty of Pharmaceutical Sciences, Iwate Medical University
| | - Tomohisa Ishikawa
- Department of Pharmacology, Graduate School of Pharmaceutical Sciences, University of Shizuoka
| |
Collapse
|
41
|
Kashihara T, Nakayama K, Ishikawa T. Distinct Roles of Protein Kinase C Isoforms in Myogenic Constriction of Rat Posterior Cerebral Arteries. J Pharmacol Sci 2008; 108:446-54. [DOI: 10.1254/jphs.08184fp] [Citation(s) in RCA: 7] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/21/2022] Open
|
42
|
Koike M, Kondo Y, Kita K, Takegawa N, Nishi N, Kashihara T, Kawakami S, Kudoh S, Blake D, Shirai T, Liley B, Ko M, Miyazaki Y, Kawasaki Z, Ogawa T. Measurements of reactive nitrogen produced by tropical thunderstorms during BIBLE-C. ACTA ACUST UNITED AC 2007. [DOI: 10.1029/2006jd008193] [Citation(s) in RCA: 20] [Impact Index Per Article: 1.2] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/09/2022]
|
43
|
Okamoto Y, Kashihara T, Nonogaki A, Obara K, Nakayama K. Differential interplay between protein kinase C and Rho-kinase in the endothelin-1-induced and pressure-induced contractions of rat posterior cerebral artery. J Cardiovasc Pharmacol 2005; 44 Suppl 1:S265-7. [PMID: 15838296 DOI: 10.1097/01.fjc.0000166281.62915.2c] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Indexed: 11/25/2022]
Abstract
To clarify the involvement of protein kinase C and Rho-kinase in the contractile activation of cerebral artery in response to endothelin-1 and pressurization, rat posterior cerebral artery (outer diameter, 100-200 microm) was mounted in arteriograph, and the changes in cytosolic Ca2+ and vessel diameter were measured by video-microscopy in connection with an Argus 50 system. Endothelin-1 (10 nM) induced a tonic contraction with a slight increase in cytosolic Ca2+, which was mostly dependent on protein kinase C (chelerythrine sensitive). Intraluminal pressurization (60 mmHg) also produced contraction with a low cytosolic Ca2+, which was myogenic in nature and dependent on both protein kinase C and Rho-kinase (Y-27632 sensitive). The results suggest differential interplay between protein kinase C and Rho-kinase in the endothelin-1-induced and pressure-induced tonic phase of contractions in the rat posterior cerebral artery.
Collapse
Affiliation(s)
- Yoshiaki Okamoto
- Department of Pharmacology, Faculty of Pharmaceutical Sciences, University of Shizuoka, Shizuoka City, Japan
| | | | | | | | | |
Collapse
|
44
|
Asakawa H, Kashihara T, Fukuda H, Yamamoto M. A patient with thymoma and four different organ-specific autoimmune diseases. Neth J Med 2002; 60:292-5. [PMID: 12430577] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 02/27/2023]
Abstract
This is the first report of a patient with four organ-specific autoimmune diseases; myasthenia gravis, type 1 diabetes mellitus, autoimmune hepatitis and Hashimoto's thyroiditis. The clinical history suggests a relationship with a non-removed thymoma. Not only the thymoma seems to have triggered these four diseases, the dramatic progressive course with an active autoimmune hepatitis and high concentrations of multiple autoantibodies was probably also associated with non-removal of the thymoma. Thymectomy should be performed in myasthenia gravis patients with thymoma and associated autoimmune diseases.
Collapse
Affiliation(s)
- H Asakawa
- Suita Municipal Hospital, Department of Internal Medicine Osaka, Japan.
| | | | | | | |
Collapse
|
45
|
Asakawa H, Tsuji M, Tokumine Y, Kashihara T, Okuno M, Takenaka R, Kawakami F. Gastric T-cell lymphoma presenting with epithelioid granulomas mimicking tuberculosis in regional lymph nodes. J Gastroenterol 2001; 36:190-4. [PMID: 11291883 DOI: 10.1007/s005350170128] [Citation(s) in RCA: 16] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Indexed: 02/04/2023]
Abstract
In patients with malignant lymphomas, a sarcoid reaction is occasionally observed. However, lymphoma-related granulomas with caseous necrosis are rare. We describe such a case of T-cell gastric lymphoma that was difficult to diagnose. A 50-year-old man was referred to our hospital because of abnormal gastric endoscopic findings: hypertrophic folds with narrowing of the gastric lumen and multiple ulcers in the body. Gastric biopsy specimens showed non-specific inflammation. An open biopsy of the enlarged gastric regional lymph nodes was performed. The sections revealed effacement of the normal architecture and replacement by numerous epithelioid granulomas accompanied by Langhan's type giant cells with or without central caseous necrosis, strongly suggesting tuberculosis. However, mycobacteria and other causative organisms were not detected, and an anti-tuberculous regimen was ineffective. Repeat gastric biopsies were performed and, finally, atypical lymphocytes were observed infiltrating the mucosa. The patient was diagnosed with gastric T-cell lymphoma based on the results of immunohistochemical stainings. After chemotherapy, a total gastrectomy was performed. The diagnosis of gastric T-cell lymphoma with a sarcoid reaction was confirmed by histological findings of the sections. Namely, the gastric wall was replaced by atypical lymphocytes showing the phenotype of helper T cells, admixed with epithelioid granulomas with Langhan's type giant cells. Thus, this case suggests that regional lymph nodes in gastric lymphomas may be present as epithelioid granulomas with caseous necrosis, mimicking tuberculosis.
Collapse
MESH Headings
- Antitubercular Agents/therapeutic use
- Biopsy
- Chemotherapy, Adjuvant
- Combined Modality Therapy/methods
- Diagnosis, Differential
- Gastrectomy
- Giant Cells, Langhans
- Granuloma, Giant Cell/etiology
- Granuloma, Giant Cell/pathology
- Humans
- Lymphoma, T-Cell/complications
- Lymphoma, T-Cell/diagnosis
- Lymphoma, T-Cell/therapy
- Male
- Middle Aged
- Stomach Neoplasms/complications
- Stomach Neoplasms/diagnosis
- Stomach Neoplasms/therapy
- Tuberculosis, Lymph Node/diagnosis
- Tuberculosis, Lymph Node/drug therapy
Collapse
Affiliation(s)
- H Asakawa
- Department of Internal Medicine, Itami City Hospital, Itami, Japan
| | | | | | | | | | | | | |
Collapse
|
46
|
Sawada-Hase N, Kiyohara T, Miyagawa J, Ueyama H, Nishibayashi H, Murayama Y, Kashihara T, Nakahara M, Miyazaki Y, Kanayama S, Nezu R, Shinomura Y, Matsuzawa Y. An increased number of CD40-high monocytes in patients with Crohn's disease. Am J Gastroenterol 2000; 95:1516-23. [PMID: 10894589 DOI: 10.1111/j.1572-0241.2000.01938.x] [Citation(s) in RCA: 18] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Indexed: 12/11/2022]
Abstract
OBJECTIVE CD40-CD40 ligand (CD40L) interaction is essential for the T-lymphocyte-dependent immune response. This interaction may be operational in the pathogenesis of inflammatory bowel diseases (IBD). The present study examined the expression of CD40 in peripheral blood mononuclear cells (PBMNCs) and tissue specimens, and CD40-stimulated interleukin (IL)-12 release from PBMNCs in IBD. METHODS The expression of CD40 in PBMNCs and tissue inflammatory cells was examined by flowcytometry and immunohistochemistry, respectively. IL-12 release was measured in cultured media of PBMNCs by an enzyme-linked immunosorbent assay. RESULTS Most peripheral blood B-lymphocytes expressed CD40 in all subjects. However, in ulcerative colitis (UC) patients, a significantly increased mean fluorescence intensity (MFI) of CD40 on B-lymphocytes was detected, compared with control subjects and patients with Crohn's disease (CD). In contrast, both the percentage positivity and MFI of CD40 on monocytes of active CD subjects were significantly increased, compared with the other groups. In active CD patients, a high level of IL-12 release from PBMNCs was observed by CD40 stimulation, compared with those of the other groups. When primed with IFN-gamma, PBMNCs from inactive CD patients released a significantly high level of IL-12, probably via stimulation by the CD40 monoclonal antibody. In the affected mucosa of CD, numerous CD40-positive cells were demonstrated, and they were also CD68-positive, suggesting these double CD40/ CD68-positive cells are tissue macrophages. CONCLUSIONS These results suggest that the examination of CD40 expression in PBMNCs might enable the differentiation of CD from UC. CD40-high monocytes in CD patients may play a role in the pathogenesis of CD.
Collapse
Affiliation(s)
- N Sawada-Hase
- Department of Internal Medicine and Molecular Science, Graduate School of Medicine, Osaka University, Japan
| | | | | | | | | | | | | | | | | | | | | | | | | |
Collapse
|
47
|
Fukuzaki T, Kawata S, Imai Y, Tamura S, Inada M, Maeda H, Shirai Y, Maeda Y, Yabuuchi I, Kiriyama K, Himeno S, Toyoshima H, Nishikawa M, Kashihara T, Minami Y, Nishiuchi M, Seki K, Matsuzawa Y. Changes in serum hepatic fibrosis markers in biochemical responders to interferon therapy for chronic hepatitis C. Hepatol Res 2000; 17:156-166. [PMID: 10707009 DOI: 10.1016/s1386-6346(99)00073-x] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Indexed: 02/08/2023]
Abstract
Serum hepatic fibrosis markers (7s domain of type IV collagen, N-terminal peptide of type III procollagen, and hyaluronate) were determined during and after a 6-month interferon treatment of patients with chronic hepatitis C. Changes in these markers were compared among the patients who showed a sustained normalization of serum alanine transaminase (ALT) levels with and without eradication of serum hepatitis C virus RNA (complete responders and biochemical responders) and nonresponders. In the case of complete responders, the serum 7s domain of type IV collagen and the N-terminal peptide of type III procollagen levels decreased at the end and 24 weeks after the end of the treatment. Hyaluronate levels were significantly decreased 24 weeks after the end of the treatment, as compared with those prior to the treatment. During and after interferon treatment, changes in these markers in the case of biochemical responders were nearly the same as those in the complete responders. These results suggest that serum hepatic fibrosis markers decrease in patients with chronic hepatitis C who show a sustained normalization of ALT after interferon treatment, even if serum hepatitis C virus RNA fails to be eradicated.
Collapse
Affiliation(s)
- T Fukuzaki
- Department of Internal Medicine and Molecular Science, Osaka University Medical School, 2-2 Yamadaoka, Suita, Osaka, Japan
| | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | |
Collapse
|
48
|
Abstract
We describe an autopsy case of primary hepatic leiomyosarcoma in a 68-year-old man with hepatitis C virus-related liver cirrhosis. The patient, who had a history of acute hepatitis 20 years previously, died of a ruptured hepatic tumor. At autopsy, a well-circumscribed 14 x 16 x 15 cm tumor replaced the medial site of the right hepatic lobe with multiple intrahepatic and distant metastases. Histologically the tumor, which had extensive central necrosis, consisted predominantly of well or moderately differentiated spindle-shaped cells, which were positive for smooth muscle actin and vimentin on immunohistochemical staining. In addition, clusters of markedly atypical cells and myxoid change of the matrix were discretely found in the focal and small areas of the tumor. These findings indicated that many sections were necessary for the histologically accurate estimation of primary hepatic smooth muscle tumor. The histological examination of a non-tumorous lesion showed liver cirrhosis. Hepatitis C virus was detected in the cytoplasm of cirrhotic hepatocytes by immunohistochemistry and reverse transcriptase-polymerase chain reaction, but not in the tumor cells. This suggested that the virus was not directly involved in the development of primary hepatic leiomyosarcoma.
Collapse
Affiliation(s)
- M Tsuji
- Division of Pathology, Department of Laboratory Medicine, Osaka Medical College Hospital, Takatsuki, Osaka, Japan.
| | | | | | | | | | | |
Collapse
|
49
|
Tsuji M, Kashihara T, Terada N, Mori H. An immunohistochemical study of hepatic atypical adenomatous hyperplasia, hepatocellular carcinoma, and cholangiocarcinoma with alpha-fetoprotein, carcinoembryonic antigen, CA19-9, epithelial membrane antigen, and cytokeratins 18 and 19. Pathol Int 1999; 49:310-7. [PMID: 10365850 DOI: 10.1046/j.1440-1827.1999.00865.x] [Citation(s) in RCA: 54] [Impact Index Per Article: 2.2] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/13/2022]
Abstract
Eight hepatic atypical adenomatous hyperplasias (AH), 30 hepatocellular carcinomas (HCC) consisting of 11 well-, 13 moderately and six poorly differentiated HCC, and 10 intrahepatic cholangiocarcinomas (CC) were investigated immunohistochemically with anti-alpha-fetoprotein (AFP), carcinoembryonic antigen (CEA), CA19-9, epithelial membrane antigen (EMA), and cytokeratins (CK) 18 and 19 antibodies. Immunostaining was regarded as positive when more than 5% of cells were stained. Alpha-fetoprotein was positive, although focally, in five (17%) of 30 HCC but negative in all AH and CC. Carcinoembryonic antigen (polyclonal antibody) did not stain the cytoplasm of all AH and HCC, but stained two (25%) of eight AH and 10 (33%) of 30 HCC in a bile canalicular staining manner. Carcinoembryonic antigen showed intracytoplasmic or luminal border staining in six (60%) of 10 CC. CA19-9 was negative in all AH and HCC, while six (60%) of 10 CC were positive for CA19-9. Epithelial membrane antigen was positive in one (13%) of eight AH, seven (23%) of 30 HCC and in all 10 cases of CC. Cytokeratin 18 was positive in all AH, HCC and CC. Cytokeratin 19 was negative in both AH and HCC, whereas it stained the cytoplasm of tumor cells in all CC diffusely and intensely. These results suggest that immunostaining of AFP, CEA, CA19-9, EMA, CK18 and CK19 are not useful in the differential diagnosis between AH and well-differentiated HCC, and that CK19 is the most suitable reagent for the differential diagnosis between HCC and CC.
Collapse
Affiliation(s)
- M Tsuji
- Department of Pathology, Itami City Hospital, Itami, Hyogo, Japan
| | | | | | | |
Collapse
|
50
|
Kashihara T, Ohki A, Kobayashi T, Sato T, Nishizawa H, Ogawa K, Tako H, Kawakami F, Tsuji M, Tamaoka K. Intrahepatic cholangiocarcinoma with increased serum CYFRA 21-1 level. J Gastroenterol 1998; 33:447-53. [PMID: 9658330 DOI: 10.1007/s005350050112] [Citation(s) in RCA: 18] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Indexed: 02/08/2023]
Abstract
CYFRA 21-1 is a fragment of cytokeratin 19 (CK 19). Four patients with large intrahepatic (or peripheral) cholangiocarcinoma (CC) and high serum levels of CYFRA 21-1 (normal, < or = 2 ng/ml) are reported. CYFRA 21-1 levels exceeded 9 ng/ml in all 4 patients. Carcinoembryonic antigen (CEA), was high in 1 (CEA; normal range, < or = 5.0 ng/ml) and carbohydrate antigen 19-9 (CA 19-9) was high in 3 (CA19-9; normal range, < or = 36 U/ml). We also measured serum levels of CYFRA 21-1 in 13 patients with hepatocellular carcinoma (HCC) more than 5 cm in diameter. Levels of CYFRA 21-1 exceeded 2 ng/ml in 9 of the HCC patients and were higher than 9 ng/ml in 2 of the HCC patients. Levels of alpha fetoprotein (AFP) and/or protein induced by vitamin K absence or antagonist II (PIVKA II) were elevated in all HCC patients (AFP, PIVKA II, respectively; normal range, < or = 10.0 ng/ml and < or = 0.1 AU/ml) CYFRA 21-1 levels were measured twice or three times during the clinical course in 2 CC patients and in 6 HCC patients, and increased gradually with tumor growth in the 2 CC patients and in 3 of the 6 HCC patients. Marked increases in serum CYFRA 21-1 levels in patients with large liver cancers, particularly in those with normal levels of AFP and PIVKA II, would suggest the existence of intrahepatic CC rather than HCC.
Collapse
Affiliation(s)
- T Kashihara
- Department of Internal Medicine, Itami City Hospital, Japan
| | | | | | | | | | | | | | | | | | | |
Collapse
|