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Takamatsu Y, Inoue T, Nishio T, Soma K, Kondo Y, Mishima T, Takamura H, Okamura M, Maejima H. Potential effect of physical exercise on the downregulation of BDNF mRNA expression in rat hippocampus following intracerebral hemorrhage. Neurosci Lett 2024; 824:137670. [PMID: 38342427 DOI: 10.1016/j.neulet.2024.137670] [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] [Subscribe] [Scholar Register] [Received: 11/10/2023] [Revised: 01/24/2024] [Accepted: 02/05/2024] [Indexed: 02/13/2024]
Abstract
OBJECTIVES Physical exercise is known to induce expression of the neuroprotective brain derived neurotrophic factor (BDNF) in the hippocampus. This study examined the effects of physical exercise on hippocampal BDNF expression and the potential benefits for preventing remote secondary hippocampal damage and neurological impairment following intracerebral hemorrhage (ICH). MATERIALS AND METHODS Wistar rats were randomly assigned to sham-operated, ICH, and ICH followed by exercise (ICH/Ex) groups. The two ICH groups were injected with type IV collagenase into the left basal ganglia, while sham animals were injected with equal-volume saline. The ICH/Ex group rats ran on a treadmill at 11 m/min for 30 min/day from day 3 to 16 post-ICH. All animals were examined for neurological function on day 2 pretreatment and from day 3 to 15 posttreatment, for spontaneous motor activity in the open field on day 15, and for cognitive ability using the object location test on day 16. Animals were then euthanized and bilateral hippocampi collected for gene expression analyses. RESULTS Experimental ICH induced neurological deficits that were not reversed by exercise. In contrast, ICH did not alter spontaneous activity or object location ability. Expression of BDNF mRNA of the ICH group was significantly downregulated in the ipsilateral hippocampus compared to the SHAM group, but this downregulation was not shown in the ICH/Ex group. The ICH/Ex group showed the downregulation of caspase-3 mRNA expression in the contralateral hippocampus compared to the SHAM group, while neither ICH nor exercise influenced toll-like receptor 4 mRNA expression. CONCLUSIONS ICH induced the secondary BDNF downregulation in the hippocampus remote from the lesion, whereas physical exercise might partially mitigate the downregulation.
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Affiliation(s)
- Yasuyuki Takamatsu
- Department of Rehabilitation Science, Faculty of Health Sciences, Hokkaido University, Kita 12 Nishi 5, Kita-ku, Sapporo 060-0812, Japan; Department of Physical Therapy, College of Life and Health Sciences, Chubu University, 1200 Matsumoto-cho, Kasugai 487-8501, Japan.
| | - Takahiro Inoue
- Graduate School of Health Sciences, Hokkaido University, Kita 12 Nishi 5, Kita-ku, Sapporo, 060-0812, Japan; Department of System Pathology for Neurological Disorders, Brain Research Institute, Niigata University, 1-757 Asahimachidori, Chuo-ku, Niigata 951-8585, Japan
| | - Taichi Nishio
- Graduate School of Health Sciences, Hokkaido University, Kita 12 Nishi 5, Kita-ku, Sapporo, 060-0812, Japan
| | - Kiho Soma
- Department of Health Sciences, School of Medicine, Hokkaido University, Kita 12 Nishi 5, Kita-ku, Sapporo 060-0812, Japan
| | - Yuki Kondo
- Department of Health Sciences, School of Medicine, Hokkaido University, Kita 12 Nishi 5, Kita-ku, Sapporo 060-0812, Japan
| | - Taiga Mishima
- Department of Health Sciences, School of Medicine, Hokkaido University, Kita 12 Nishi 5, Kita-ku, Sapporo 060-0812, Japan
| | - Hana Takamura
- Department of Health Sciences, School of Medicine, Hokkaido University, Kita 12 Nishi 5, Kita-ku, Sapporo 060-0812, Japan
| | - Misato Okamura
- Graduate School of Health Sciences, Hokkaido University, Kita 12 Nishi 5, Kita-ku, Sapporo, 060-0812, Japan
| | - Hiroshi Maejima
- Department of Rehabilitation Science, Faculty of Health Sciences, Hokkaido University, Kita 12 Nishi 5, Kita-ku, Sapporo 060-0812, Japan
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Nishio T, Inoue T, Takamatsu Y, Mishima T, Takamura H, Soma K, Kondo Y, Okamura M, Ikegami R, Maejima H. Epigenetic modification of histone acetylation in the sensorimotor cortex after intracerebral hemorrhage. Biomed Res 2024; 45:1-11. [PMID: 38325841 DOI: 10.2220/biomedres.45.1] [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] [Subscribe] [Scholar Register] [Indexed: 02/09/2024]
Abstract
Epigenetic regulation is involved in post-stroke neuroplasticity. We investigated the effects of intracerebral hemorrhage (ICH) on histone acetylation and gene expression related to neuronal plasticity in the bilateral sensorimotor cortices, which may affect post-stroke sensorimotor function. Wistar rats were randomly divided into the SHAM and ICH groups. We performed ICH surgery stereotaxically based on the microinjection of a collagenase solution in the ICH group. Foot fault and cylinder tests were performed to evaluate motor functions at 4-time points, including pre-ICH surgery. The amount of acetyl histones and the mRNA expression of neurotrophic factors crucial to neuroplasticity in the bilateral sensorimotor cortices were analyzed approximately 2 weeks after ICH surgery. Sensorimotor functions of the ICH group were inferior to those of the SHAM group during 2 weeks post-ICH. ICH increased the acetylation of histone H3 and H4 over the sham level in the ipsilateral and contralateral cortices. ICH increased the mRNA expression of IGF-1, but decreased the expression of BDNF compared with the sham level in the ipsilateral cortex. The present study suggests that histone acetylation levels are enhanced in bilateral sensorimotor cortices after ICH, presenting an altered epigenetic platform for gene expressions related to neuronal plasticity.
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Affiliation(s)
- Taichi Nishio
- Graduate School of Health Sciences, Hokkaido University, Kita 12 Nishi 5, Kita-ku, Sapporo, 060-0812, Japan
| | - Takahiro Inoue
- Graduate School of Health Sciences, Hokkaido University, Kita 12 Nishi 5, Kita-ku, Sapporo, 060-0812, Japan
| | - Yasuyuki Takamatsu
- Department of Rehabilitation Science, Faculty of Health Sciences, Hokkaido University, Kita 12 Nishi 5, Kita-ku, Sapporo, 060-0812, Japan
| | - Taiga Mishima
- Department of Health Sciences, School of Medicine, Hokkaido University, Kita 12 Nishi 5, Kita-ku, Sapporo 060-0812, Japan
| | - Hana Takamura
- Department of Health Sciences, School of Medicine, Hokkaido University, Kita 12 Nishi 5, Kita-ku, Sapporo 060-0812, Japan
| | - Kiho Soma
- Department of Health Sciences, School of Medicine, Hokkaido University, Kita 12 Nishi 5, Kita-ku, Sapporo 060-0812, Japan
| | - Yuki Kondo
- Department of Health Sciences, School of Medicine, Hokkaido University, Kita 12 Nishi 5, Kita-ku, Sapporo 060-0812, Japan
| | - Misato Okamura
- Graduate School of Health Sciences, Hokkaido University, Kita 12 Nishi 5, Kita-ku, Sapporo, 060-0812, Japan
| | - Ryo Ikegami
- Graduate School of Health Sciences, Hokkaido University, Kita 12 Nishi 5, Kita-ku, Sapporo, 060-0812, Japan
| | - Hiroshi Maejima
- Department of Rehabilitation Science, Faculty of Health Sciences, Hokkaido University, Kita 12 Nishi 5, Kita-ku, Sapporo, 060-0812, Japan
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Okamura M, Inoue T, Takamatsu Y, Maejima H. Pharmacological inhibition of histone deacetylases ameliorates cognitive impairment after intracerebral hemorrhage with epigenetic alteration in the hippocampus. J Stroke Cerebrovasc Dis 2023; 32:107275. [PMID: 37523880 DOI: 10.1016/j.jstrokecerebrovasdis.2023.107275] [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: 01/24/2023] [Revised: 07/15/2023] [Accepted: 07/20/2023] [Indexed: 08/02/2023] Open
Abstract
OBJECTIVES Post-stroke cognitive impairment (PSCI) interferes with neurorehabilitation in patients with stroke. Epigenetic regulation of the hippocampus has been targeted to ameliorate cognitive function. In particular, the acetylation level of histones is modulated by exercise, a potent therapy for patients with stroke. MATERIALS AND METHODS We examined the effects of exercise and pharmacological inhibition of histone deacetylase (HDAC) using sodium butyrate (NaB) on cognitive function and epigenetic factors in the hippocampus after intracerebral hemorrhage (ICH) to seek beneficial neuronal conditioning against PSCI. Forty rats were randomly assigned to five groups: sham, control, NaB, exercise, and NaB plus exercise groups (n=8 in each group). Except for those in the sham group, all rats underwent stereotaxic ICH surgery with a microinjection of collagenase solution. Intraperitoneal administration of NaB (300 mg/kg) and treadmill exercise (11 m/min for 30 min) were conducted for approximately 4 weeks starting 3 days post-surgery. RESULTS ICH reduced cognitive function, as detected by the object location test, accompanied by enhanced activity of HDACs. Although exercise did not modulate HDAC activity or cognitive function, repetitive NaB administration increased HDAC activity and ameliorated cognitive impairment induced by ICH. CONCLUSIONS This study suggests that pharmacological treatment with an HDAC inhibitor could potentially present an enriched epigenetic platform in the hippocampus and ameliorate PSCI for neurorehabilitation following ICH.
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Affiliation(s)
- Misato Okamura
- Graduate School of Health Sciences, Hokkaido University, Kita 12 Nishi 5, Kita-ku, Sapporo, 060-0812, Japan
| | - Takahiro Inoue
- Graduate School of Health Sciences, Hokkaido University, Kita 12 Nishi 5, Kita-ku, Sapporo, 060-0812, Japan
| | - Yasuyuki Takamatsu
- Department of Rehabilitation Science, Faculty of Health Sciences, Hokkaido University, Kita 12 Nishi 5, Kita-ku, Sapporo, 060-0812, Japan
| | - Hiroshi Maejima
- Department of Rehabilitation Science, Faculty of Health Sciences, Hokkaido University, Kita 12 Nishi 5, Kita-ku, Sapporo, 060-0812, Japan.
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Maejima H, Okamura M, Inoue T, Takamatsu Y, Nishio T, Liu Y. Epigenetic modifications in the motor cortex caused by exercise or pharmacological inhibition of histone deacetylases (HDACs) after intracerebral hemorrhage (ICH). Brain Res 2023; 1806:148286. [PMID: 36801267 DOI: 10.1016/j.brainres.2023.148286] [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] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/10/2022] [Revised: 01/30/2023] [Accepted: 02/14/2023] [Indexed: 02/18/2023]
Abstract
Epigenetic regulation is expected to provide an enriched platform for neurorehabilitation of post-stroke patients. Acetylation of specific lysine residues in histones is a potent epigenetic target essential for transcriptional regulation. Exercise modulates histone acetylation and gene expression in neuroplasticity in the brain. This study sought to examine the effect of epigenetic treatment using a histone deacetylase (HDAC) inhibitor, sodium butyrate (NaB), and exercise on epigenetic markers in the bilateral motor cortex after intracerebral hemorrhage (ICH) to identify a more enriched neuronal condition for neurorehabilitation. Forty-one male Wistar rats were randomly divided into five groups: sham (n = 8), control (n = 9), NaB, exercise (n = 8), and NaB and exercise (n = 8). Intraperitoneal administration of an HDAC inhibitor (300 mg/kg NaB) and treadmill exercise (11 m/min for 30 min) was conducted five days a week for approximately-four weeks. ICH specifically decreased the acetylation level of histone H4 in the ipsilateral cortex, and HDAC inhibition with NaB increased the acetylation level of histone H4 over the sham level, accompanied by an improvement in motor function as assessed by the cylinder test. Exercise increased the acetylation levels of histones (H3 and H4) in the bilateral cortex. Synergistic effects of exercise and NaB were not observed during histone acetylation. Pharmacological treatment with a HDAC inhibitor and exercise can provide an enriched epigenetic platform for neurorehabilitation in an individual manner.
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Affiliation(s)
- Hiroshi Maejima
- Department of Rehabilitation Science, Faculty of Health Sciences, Hokkaido University, Kita 12 Nishi 5, Kita-ku, Sapporo 060-0812, Japan.
| | - Misato Okamura
- Graduate School of Health Sciences, Hokkaido University, Kita 12 Nishi 5, Kita-ku, Sapporo 060-0812, Japan
| | - Takahiro Inoue
- Graduate School of Health Sciences, Hokkaido University, Kita 12 Nishi 5, Kita-ku, Sapporo 060-0812, Japan
| | - Yasuyuki Takamatsu
- Department of Rehabilitation Science, Faculty of Health Sciences, Hokkaido University, Kita 12 Nishi 5, Kita-ku, Sapporo 060-0812, Japan
| | - Taichi Nishio
- Graduate School of Health Sciences, Hokkaido University, Kita 12 Nishi 5, Kita-ku, Sapporo 060-0812, Japan
| | - Yushan Liu
- Graduate School of Health Sciences, Hokkaido University, Kita 12 Nishi 5, Kita-ku, Sapporo 060-0812, Japan
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Inoue T, Ikegami R, Takamatsu Y, Fukuchi M, Haga S, Ozaki M, Maejima H. Temporal dynamics of brain BDNF expression following a single bout of exercise: A bioluminescence imaging study. Neurosci Lett 2023; 799:137120. [PMID: 36764480 DOI: 10.1016/j.neulet.2023.137120] [Citation(s) in RCA: 1] [Impact Index Per Article: 1.0] [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: 11/10/2022] [Revised: 01/21/2023] [Accepted: 02/06/2023] [Indexed: 02/11/2023]
Abstract
Physical exercise increases brain-derived neurotrophic factor (BDNF) expression in the brain. However, the absence of non-invasive and repetitive monitoring of BDNF expression in the brains of living animals has limited the understanding of how BDNF expression changes after exercise. This study aimed to elucidate the temporal dynamics of BDNF expression in the brain after a single bout of exercise, using in vivo bioluminescence imaging. This study included Bdnf-Luc mice with a firefly Luciferase gene inserted at the translation start site of the mouse Bdnf gene. BDNF expression was evaluated based on the luminescence signal of the luciferase substrate administered to mice. Bioluminescence imaging was performed at 0, 1, 3, 6, 12, and 24 h after treadmill exercise (15 m/min for 1 h). Compared to the sedentary condition of each mouse, the luminescence signal increased by approximately 60 % between 1 and 3 h after exercise. The luminescence signal remained slightly increased by approximately 20 % even 6-24 h after exercise. This study is the first to demonstrate exercise-enhanced BDNF expression in the brains of living animals. These results provide evidence that a single bout of exercise transiently increases BDNF expression in the brain within a limited time window.
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Affiliation(s)
- Takahiro Inoue
- Graduate School of Health Sciences, Hokkaido University, Kita 12 Nishi 5, Kita-ku, Sapporo 060-0812, Japan; Department of System Pathology for Neurological Disorders, Brain Research Institute, Niigata University, 1-757 Asahimachidori, Chuo-ku, Niigata 951-8585, Japan
| | - Ryo Ikegami
- Graduate School of Health Sciences, Hokkaido University, Kita 12 Nishi 5, Kita-ku, Sapporo 060-0812, Japan
| | - Yasuyuki Takamatsu
- Department of Rehabilitation Science, Faculty of Health Sciences, Hokkaido University, Kita 12 Nishi 5, Kita-ku, Sapporo 060-0812, Japan
| | - Mamoru Fukuchi
- Laboratory of Molecular Neuroscience, Faculty of Pharmacy, Takasaki University of Health and Welfare, 60 Nakaorui-machi, Takasaki, Gunma 370-0033, Japan
| | - Sanae Haga
- Department of Biological Response and Regulation, Faculty of Health Sciences, Hokkaido University, Kita 12 Nishi 5, Kita-ku, Sapporo 060-0812, Japan
| | - Michitaka Ozaki
- Department of Biological Response and Regulation, Faculty of Health Sciences, Hokkaido University, Kita 12 Nishi 5, Kita-ku, Sapporo 060-0812, Japan
| | - Hiroshi Maejima
- Department of Rehabilitation Science, Faculty of Health Sciences, Hokkaido University, Kita 12 Nishi 5, Kita-ku, Sapporo 060-0812, Japan.
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Kondo H, Maejima H, Maruyama K, Fujita M, Ohki T. First Report of Chinese Wheat Mosaic Virus that Infects Barley in Japan. Plant Dis 2022; 106:PDIS12212803PDN. [PMID: 35084947 DOI: 10.1094/pdis-12-21-2803-pdn] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/14/2023]
Affiliation(s)
- H Kondo
- Institute of Plant Science and Resources (IPSR), Okayama University, Kurashiki, 710-0046, Japan
| | - H Maejima
- Nagano Prefecture Agricultural Experiment Station, Suzaka, Nagano, 382-0051, Japan
| | - K Maruyama
- Institute of Plant Science and Resources (IPSR), Okayama University, Kurashiki, 710-0046, Japan
| | - M Fujita
- Institute of Plant Science and Resources (IPSR), Okayama University, Kurashiki, 710-0046, Japan
| | - T Ohki
- NARO Hokkaido Agricultural Research Center, Sapporo, Hokkaido, 062-8555, Japan
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Inoue T, Takamatsu Y, Nishio T, Soma K, Okamura M, Tohyama H, Maejima H. Combined treatment with exercise and α5GABA AR inhibitor promotes motor function recovery after intracerebral hemorrhage. Neurosci Lett 2022; 766:136344. [PMID: 34785309 DOI: 10.1016/j.neulet.2021.136344] [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] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/29/2021] [Revised: 11/07/2021] [Accepted: 11/09/2021] [Indexed: 11/17/2022]
Abstract
The present study aimed to examine the synergistic effects of exercise and pharmacological inhibition of the α5 subunit-containing gamma-aminobutyric acid (GABA)A receptors (α5GABAAR) on motor function recovery after intracerebral hemorrhage (ICH). Wistar rats were divided into five groups (n = 8 per group): SHAM, ICH, ICH + exercise (ICH + EX), ICH + L-655,708 (ICH + L6), and ICH + L-655,708 and exercise (ICH + L6EX) groups. ICH was induced by microinjection of a collagenase solution. The ICH + EX and ICH + L6EX groups exercised on a treadmill (12 m/min for 30 min/day). L-655,708 (0.5 mg/kg), a negative allosteric modulator of α5GABAAR, was administered intraperitoneally to the ICH + L6 and ICH + L6EX groups. Each intervention was initiated 1 week after the ICH surgery and was performed for 3 weeks, followed by tissue collection, including the motor cortex and spinal cord. At 4 weeks after ICH, significant motor recovery was found in the ICH + L6EX group compared to the ICH group. L-655,708 administration increased brain-derived neurotrophic factor (BDNF) expression in the cortex. Regarding neuroplastic changes in the spinal cord, rats in the ICH + L6EX group showed a significant increase in several neuroplastic markers: 1) BDNF, 2) growth-associated protein 43 as an axonal sprouting marker, 3) synaptophysin as a synaptic marker, and 4) Nogo-A as an axonal growth inhibitor. This study is the first to demonstrate that combined treatment with exercise and α5GABAAR inhibitor effectively promoted motor function recovery after ICH. Regarding the underlying mechanism of post-ICH recovery with the combined treatment, the present study highlights the importance of both growth and inhibitory modification of axonal sprouting in the spinal cord.
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Affiliation(s)
- Takahiro Inoue
- Graduate School of Health Sciences, Hokkaido University, Kita 12 Nishi 5, Kita-ku, Sapporo 060-0812, Japan; Research Fellow of Japan Society for the Promotion of Science, 5-3-1 Kojimachi, Chiyoda-ku, Tokyo 102-0083, Japan
| | - Yasuyuki Takamatsu
- Department of Rehabilitation Science, Faculty of Health Sciences, Hokkaido University, Kita 12 Nishi 5, Kita-ku, Sapporo 060-0812, Japan
| | - Taichi Nishio
- Graduate School of Health Sciences, Hokkaido University, Kita 12 Nishi 5, Kita-ku, Sapporo 060-0812, Japan
| | - Kiho Soma
- Graduate School of Health Sciences, Hokkaido University, Kita 12 Nishi 5, Kita-ku, Sapporo 060-0812, Japan
| | - Misato Okamura
- Graduate School of Health Sciences, Hokkaido University, Kita 12 Nishi 5, Kita-ku, Sapporo 060-0812, Japan
| | - Harukazu Tohyama
- Department of Rehabilitation Science, Faculty of Health Sciences, Hokkaido University, Kita 12 Nishi 5, Kita-ku, Sapporo 060-0812, Japan
| | - Hiroshi Maejima
- Department of Rehabilitation Science, Faculty of Health Sciences, Hokkaido University, Kita 12 Nishi 5, Kita-ku, Sapporo 060-0812, Japan.
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Otsuka S, Sakakima H, Tani A, Nakanishi K, Takada S, Norimatsu K, Maejima H, Maruyama I. Effects of detraining on preconditioning exercise-induced neuroprotective potential after ischemic stroke in rats. Brain Struct Funct 2021; 226:2169-2180. [PMID: 34114048 DOI: 10.1007/s00429-021-02317-5] [Citation(s) in RCA: 3] [Impact Index Per Article: 1.0] [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: 02/13/2021] [Accepted: 06/07/2021] [Indexed: 11/24/2022]
Abstract
Preconditioning exercise prior to stroke exerts neuroprotection, which is an endogenous strategy that leads the brain cells to express several intrinsic factors and inhibits their apoptosis. However, it is unclear how long these benefits last after exercise cessation. The aim of this study was to investigate the effects of detraining on preconditioning exercise-induced neuroprotective potential after stroke. Rats were trained using a treadmill for aerobic exercise 5 days each week for 3 weeks, and their neuroprotective effects were examined until 3 weeks after exercise cessation. Stroke was induced by 60 min of left middle cerebral artery occlusion at 3 days, 1, 2, and 3 weeks after exercise cessation. Infarct volume, neurological deficits, sensorimotor function, expression levels of brain-derived neurotrophic factor (BDNF), hypoxia-induced factor-1α (HIF-1α), glial fibrillary acidic protein (GFAP), and P2X7 receptors, and apoptosis activity were examined using immunohistochemical and western blot analyses. Preconditioning exercise significantly reduced infarct volume and ameliorated sensorimotor function after stroke, and its beneficial effects were observed until 2 weeks after exercise cessation. The expression level of BDNF in the ischemic brain was significantly upregulated at 3 days after exercise cessation; however, the expression levels of HIF-1α, GFAP, and P2X7 receptor were significantly increased until 2 weeks after exercise cessation; thereby, significant anti-apoptotic effects were lost at 3 weeks of detraining. Our findings suggest that preconditioning exercise-induced neuroprotective potential may be lost shortly after exercise cessation. Neuroprotection through intrinsic protective factors, such as BDNF and HIF-1α, may provide different neuroprotective mechanisms in a time-dependent manner during detraining.
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Affiliation(s)
- Shotaro Otsuka
- Department of Systems Biology in Thromboregulation, Kagoshima University Graduate School of Medical and Dental Science, Kagoshima, Japan
| | - Harutoshi Sakakima
- Department of Physical Therapy, School of Health Sciences, Faculty of Medicine, Kagoshima University, 8-35-1, Sakuragaoka, Kagoshima, 890-8544, Japan.
| | - Akira Tani
- Department of Physical Therapy, School of Health Sciences, Faculty of Medicine, Kagoshima University, 8-35-1, Sakuragaoka, Kagoshima, 890-8544, Japan
| | - Kazuki Nakanishi
- Department of Physical Therapy, School of Health Sciences, Faculty of Medicine, Kagoshima University, 8-35-1, Sakuragaoka, Kagoshima, 890-8544, Japan
| | - Seiya Takada
- Department of Systems Biology in Thromboregulation, Kagoshima University Graduate School of Medical and Dental Science, Kagoshima, Japan
| | - Kosuke Norimatsu
- Department of Physical Therapy, School of Health Sciences, Faculty of Medicine, Kagoshima University, 8-35-1, Sakuragaoka, Kagoshima, 890-8544, Japan
| | - Hiroshi Maejima
- Department of Rehabilitation Science, Faculty of Health Sciences, Hokkaido University, Sapporo, Japan
| | - Ikuro Maruyama
- Department of Systems Biology in Thromboregulation, Kagoshima University Graduate School of Medical and Dental Science, Kagoshima, Japan
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Inoue T, Takamatsu Y, Okamura M, Mani H, Hasegawa N, Maejima H. Specific inhibition of α5 subunit-containing GABA A receptors enhances locomotor activity and neuronal activity in the motor cortex. Biomed Res 2021; 42:103-108. [PMID: 34092751 DOI: 10.2220/biomedres.42.103] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/23/2022]
Abstract
Gamma-aminobutyric acid (GABA) is a major inhibitory neurotransmitter in the central nervous system (CNS). This study examined the effect of specific inhibition of α5 subunit-containing GABAA receptors (α5GABAAR) on the behavioral profile and neuronal activity of the CNS using a compound called L-655,708, which is a selective negative allosteric modulator of α5GABAAR. L-655,708 administration significantly increased locomotor activity without anxiety-related behavior. Furthermore, L-655,708 administration significantly increased c-Fos mRNA expression (a neuronal activity marker) in motor area of the cerebral cortex, whereas it hardly altered c-Fos mRNA expression in the sensory cortex, hippocampus, and spinal cord. This study revealed for the first time that alteration of neuronal activity with specific inhibition of α5GABAAR differs depending on each CNS region. α5GABAAR could be a potential target for modulating CNS excitability and behavioral activity.
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Affiliation(s)
- Takahiro Inoue
- Graduate School of Health Sciences, Hokkaido University.,Research Fellow of Japan Society for the Promotion of Science
| | - Yasuyuki Takamatsu
- Department of Rehabilitation Science, Faculty of Health Sciences, Hokkaido University
| | | | - Hiroki Mani
- Department of Rehabilitation Science, Faculty of Health Sciences, Hokkaido University
| | - Naoya Hasegawa
- Department of Rehabilitation Science, Faculty of Health Sciences, Hokkaido University
| | - Hiroshi Maejima
- Department of Rehabilitation Science, Faculty of Health Sciences, Hokkaido University
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Inoue T, Takamatsu Y, Okamura M, Maejima H. Ipsilateral BDNF mRNA expression in the motor cortex positively correlates with motor function of the affected forelimb after intracerebral hemorrhage. Brain Res 2021; 1767:147536. [PMID: 34052261 DOI: 10.1016/j.brainres.2021.147536] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.7] [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: 01/04/2021] [Revised: 04/27/2021] [Accepted: 05/20/2021] [Indexed: 01/01/2023]
Abstract
Intracerebral hemorrhage (ICH) is a subtype of stroke that causes major motor impairments. Brain-derived neurotrophic factor (BDNF) is known to have important roles in neuroplasticity and beneficially contributes to stroke recovery. This study aimed to characterize BDNF expression in the motor cortex after ICH and investigate the relationship between cortical BDNF expression and behavioral outcomes using an ICH rat model. Wistar rats were divided into two groups: a SHAM group (n = 7) and an ICH group (n = 8). ICH was induced by the injection of collagenase into the left striatum near the internal capsule. For behavioral assessments, the cylinder test and open field test were performed before surgery and 3 days, 1 week, 2 weeks, and 4 weeks after surgery. Following the behavioral assessments at 4 weeks, BDNF expression in the ipsilateral and contralateral motor cortex was assayed using RT-PCR and ELISA methods. There was no significant difference in either cortical BDNF mRNA or protein expression levels between the SHAM and ICH groups. However, the asymmetry index of BDNF mRNA expression between the ipsilateral and contralateral hemispheres shifted to the ipsilateral hemisphere after ICH. Furthermore, the ipsilateral cortical BDNF mRNA expression level positively correlated with motor function in the affected forelimb after ICH. This study describes for the first time that cortical BDNF mRNA expression is related to post-ICH motor impairment. These results highlight the importance of assessing the interhemispheric laterality of BDNF expression and could help develop novel treatment strategies for BDNF-dependent recovery after ICH.
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Affiliation(s)
- Takahiro Inoue
- Graduate School of Health Sciences, Hokkaido University, Kita 12 Nishi 5, Kita-ku, Sapporo 060-0812, Japan; Research Fellow of Japan Society for the Promotion of Science, 5-3-1 Kojimachi, Chiyoda-ku, Tokyo 102-0083, Japan
| | - Yasuyuki Takamatsu
- Department of Rehabilitation Science, Faculty of Health Sciences, Hokkaido University, Kita 12 Nishi 5, Kita-ku, Sapporo 060-0812, Japan
| | - Misato Okamura
- Graduate School of Health Sciences, Hokkaido University, Kita 12 Nishi 5, Kita-ku, Sapporo 060-0812, Japan
| | - Hiroshi Maejima
- Department of Rehabilitation Science, Faculty of Health Sciences, Hokkaido University, Kita 12 Nishi 5, Kita-ku, Sapporo 060-0812, Japan.
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Takamatsu Y, Inoue T, Okamura M, Ikegami R, Maejima H. In vivo local transcranial static magnetic field stimulation alters motor behavior in normal rats. Neurosci Lett 2021; 753:135864. [PMID: 33812926 DOI: 10.1016/j.neulet.2021.135864] [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: 11/02/2020] [Revised: 03/25/2021] [Accepted: 03/25/2021] [Indexed: 11/18/2022]
Abstract
Transcranial static magnetic field stimulation (tSMS) has inhibitory neuromodulatory effects on the human brain. Most of the studies on static magnetic fields have been performed in vitro. To further understand the biological mechanisms of tSMS, we investigated the effects of in vivo tSMS on motor behavior in normal awake rats. The skull of a male Wistar rat was exposed and a polyethylene tube was attached to the skull using dental cement at the center of the motor cortex (n = 7) or the other cortex (n = 6). By attaching a cylindrical NdFeB neodymium magnet into the tube, in vivo tSMS (REAL) was performed. For SHAM, we applied a similar size non-magnetic stainless-steel cylinder. All rats received twice each SHAM and REAL stimulation every two days using a crossover design, and motor function was measured during the stimulation. Activity level and asymmetry of forelimb use were not affected, but less accurate movements in the horizontal ladder test were found in REAL stimulation of the motor cortex. This study shows that in vivo tSMS has inhibitory neuromodulatory effects on motor behavior depending on the stimulated region on the rat cortex.
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Affiliation(s)
- Yasuyuki Takamatsu
- Department of Rehabilitation Science, Faculty of Health Sciences, Hokkaido University, Kita 12 Nishi 5, Kita-ku, Sapporo 060-0812, Japan.
| | - Takahiro Inoue
- Research Fellow of Japan Society for the Promotion of Science, 5-3-1 Kojimachi, Chiyoda-ku, Tokyo 102-0083, Japan; Graduate School of Health Sciences, Hokkaido University, Kita 12 Nishi 5, Kita-ku, Sapporo 060-0812, Japan
| | - Misato Okamura
- Graduate School of Health Sciences, Hokkaido University, Kita 12 Nishi 5, Kita-ku, Sapporo 060-0812, Japan
| | - Ryo Ikegami
- Graduate School of Health Sciences, Hokkaido University, Kita 12 Nishi 5, Kita-ku, Sapporo 060-0812, Japan
| | - Hiroshi Maejima
- Department of Rehabilitation Science, Faculty of Health Sciences, Hokkaido University, Kita 12 Nishi 5, Kita-ku, Sapporo 060-0812, Japan
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Kitahara M, Inoue T, Mani H, Takamatsu Y, Ikegami R, Tohyama H, Maejima H. Exercise and pharmacological inhibition of histone deacetylase improves cognitive function accompanied by an increase of gene expressions crucial for neuronal plasticity in the hippocampus. Neurosci Lett 2021; 749:135749. [PMID: 33610667 DOI: 10.1016/j.neulet.2021.135749] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.7] [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: 01/08/2021] [Revised: 02/09/2021] [Accepted: 02/13/2021] [Indexed: 02/08/2023]
Abstract
Exercise is recognized to increase the expression of neurotrophic genes in the hippocampus and prevent cognitive impairment. Histone deacetylase (HDAC) inhibitor acetylate histones and enhance gene transcription in epigenetic regulation. HDAC inhibitors are expected to be an efficacious pharmacological treatment for cognitive function. This study aimed to examine the effect of HDAC inhibitors and exercise on epigenetic markers and neurotrophic gene expression in the hippocampus to find a more enriched brain conditioning for cognitive function based on the synergic effects of pharmacological treatment and behavioral therapy. Thirteen-week-old male mice were divided into four groups. Intraperitoneal administration of an HDAC inhibitor (1.2 g/kg sodium butyrate, NaB) and treadmill exercise (approximately 10 m/min for 60 min) were performed 5 days a week for 4 weeks. NaB administration increased the expression of an immediate-early gene, a neurotrophin, and a neurotrophin receptor in the hippocampus. These results indicate that HDAC inhibition could present an enriched platform for neuronal plasticity in the hippocampus and cognitive function. The novel object recognition test showed that NaB administration increased the score. Notably, the step-through passive avoidance test showed improved learning and memory in the presence of exercise and exercise, indicating that the mice acquired fear memory, specifically in the presence of NaB administration plus exercise. This study found that repetitive administration of HDAC inhibitors improved cognitive function and HDAC inhibitor administration plus exercise has a synergic effect on learning and memory, accompanying the enhancement of crucial gene transcriptions for neuronal plasticity in the hippocampus.
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Affiliation(s)
- Mika Kitahara
- Graduate School of Health Sciences, Hokkaido University, Kita 12 Nishi 5, Kita-ku, Sapporo, 060-0812, Japan
| | - Takahiro Inoue
- Graduate School of Health Sciences, Hokkaido University, Kita 12 Nishi 5, Kita-ku, Sapporo, 060-0812, Japan; Research Fellow of Japan Society for the Promotion of Science, 5-3-1 Kojimachi, Chiyoda-ku, Tokyo, 102-0083, Japan
| | - Hiroki Mani
- Department of Rehabilitation Science, Faculty of Health Sciences, Hokkaido University, Kita 12 Nishi 5, Kita-ku, Sapporo, 060-0812, Japan
| | - Yasuyuki Takamatsu
- Department of Rehabilitation Science, Faculty of Health Sciences, Hokkaido University, Kita 12 Nishi 5, Kita-ku, Sapporo, 060-0812, Japan
| | - Ryo Ikegami
- Graduate School of Health Sciences, Hokkaido University, Kita 12 Nishi 5, Kita-ku, Sapporo, 060-0812, Japan
| | - Harukazu Tohyama
- Department of Rehabilitation Science, Faculty of Health Sciences, Hokkaido University, Kita 12 Nishi 5, Kita-ku, Sapporo, 060-0812, Japan
| | - Hiroshi Maejima
- Department of Rehabilitation Science, Faculty of Health Sciences, Hokkaido University, Kita 12 Nishi 5, Kita-ku, Sapporo, 060-0812, Japan.
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Maejima H, Kitahara M, Takamatsu Y, Mani H, Inoue T. Effects of exercise and pharmacological inhibition of histone deacetylases (HDACs) on epigenetic regulations and gene expressions crucial for neuronal plasticity in the motor cortex. Brain Res 2020; 1751:147191. [PMID: 33152341 DOI: 10.1016/j.brainres.2020.147191] [Citation(s) in RCA: 4] [Impact Index Per Article: 1.0] [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: 07/27/2020] [Revised: 10/21/2020] [Accepted: 10/28/2020] [Indexed: 01/12/2023]
Abstract
The objective of this study was to examine the effect of epigenetic treatment using an histone deacetylases (HDAC) inhibitor in addition to aerobic exercise on the epigenetic markers and neurotrophic gene expressions in the motor cortex, to find a more enriched brain pre-conditioning for motor learning in neurorehabilitation. ICR mice were divided into four groups based on two factors: HDAC inhibition and exercise. Intraperitoneal administration of an HDAC inhibitor (1.2 g/kg sodium butyrate, NaB) and treadmill exercise (approximately at 10 m/min for 60 min) were conducted five days a week for four weeks. NaB administration inhibited total HDAC activity and enhanced acetylation level of histones specifically in histone H4, accompanying the increase of transcription levels of immediate-early genes (IEGs) (c-fos and Arc) and neurotrophins (BDNF and NT-4) crucial for neuroplasticity in the motor cortex. However, exercise enhanced HDAC activity and acetylation level of histone H4 and H3 without the modification of transcription levels. In addition, there were no synergic effects between HDAC inhibition and the exercise regime on the gene expressions. This study showed that HDAC inhibition could present more enriched condition for neuroplasticity to the motor cortex. However, exercise-induced neurotrophic gene expressions could depend on exercise regimen based on the intensity, the term etc. Therefore, this study has a novelty suggesting that pharmacological HDAC inhibition could be an alternative potent approach to present a neuronal platform with enriched neuroplasticity for motor learning and motor recovery, however, an appropriate exercise regimen is expected in this approach.
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Affiliation(s)
- Hiroshi Maejima
- Department of Rehabilitation Science, Faculty of Health Sciences, Hokkaido University, Kita 12 Nishi 5, Kita-ku, Sapporo 060-0812, Japan.
| | - Mika Kitahara
- Graduate School of Health Sciences, Hokkaido University, Kita 12 Nishi 5, Kita-ku, Sapporo 060-0812, Japan
| | - Yasuyuki Takamatsu
- Department of Rehabilitation Science, Faculty of Health Sciences, Hokkaido University, Kita 12 Nishi 5, Kita-ku, Sapporo 060-0812, Japan
| | - Hiroki Mani
- Department of Rehabilitation Science, Faculty of Health Sciences, Hokkaido University, Kita 12 Nishi 5, Kita-ku, Sapporo 060-0812, Japan
| | - Takahiro Inoue
- Graduate School of Health Sciences, Hokkaido University, Kita 12 Nishi 5, Kita-ku, Sapporo 060-0812, Japan; Research Fellow of Japan Society for the Promotion of Science, 5-3-1 Kojimachi, Chiyoda-ku, Tokyo 102-0083, Japan
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Li X, Inoue T, Hayashi M, Maejima H. Exercise enhances the expression of brain-derived neurotrophic factor in the hippocampus accompanied by epigenetic alterations in senescence-accelerated mice prone 8. Neurosci Lett 2019; 706:176-181. [DOI: 10.1016/j.neulet.2019.05.031] [Citation(s) in RCA: 5] [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: 02/11/2019] [Revised: 04/26/2019] [Accepted: 05/16/2019] [Indexed: 02/05/2023]
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Maejima H, Inoue T, Takamatsu Y. Therapeutic exercise accompanied by neuronal modulation to enhance neurotrophic factors in the brain with central nervous system disorders. Phys Ther Res 2019; 22:38-43. [PMID: 31289711 DOI: 10.1298/ptr.r0004] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.4] [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: 12/13/2018] [Accepted: 03/05/2019] [Indexed: 12/13/2022]
Abstract
Exercise is a primary therapeutic regimen in physical therapy to rehabilitate the motor function of patients with central nervous system (CNS) disorders such as cerebrovascular accident (CVA). Furthermore, exercise positively contributes to cognitive function related to neuroplasticity and neuroprotection in the hippocampus. Neurotrophins play a crucial role in neuroplasticity, neurogenesis, and neuroprotection in the CNS. Exercise enhances the expression of neurotrophins in the brain. Thus, novel regimens for kinesiotherapy in CNS disorders to further enhance exercise-induced expression are expected. In this review, we described three novel regimens for kinesiotherapy in CNS disorders based on the interaction between exercise and pharmacological treatment with the idea of "inhibition of inhibition" in the CNS.
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Affiliation(s)
- Hiroshi Maejima
- Department of Rehabilitation Science, Faculty of Health Sciences, Hokkaido University
| | | | - Yasuyuki Takamatsu
- Department of Rehabilitation Science, Faculty of Health Sciences, Hokkaido University
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Maejima H, Ninuma S, Okuda A, Inoue T, Hayashi M. Exercise and low-level GABAA receptor inhibition modulate locomotor activity and the expression of BDNF accompanied by changes in epigenetic regulation in the hippocampus. Neurosci Lett 2018; 685:18-23. [DOI: 10.1016/j.neulet.2018.07.009] [Citation(s) in RCA: 15] [Impact Index Per Article: 2.5] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/08/2018] [Revised: 06/11/2018] [Accepted: 07/05/2018] [Indexed: 11/24/2022]
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Maejima H, Kanemura N, Kokubun T, Murata K, Takayanagi K. Exercise enhances cognitive function and neurotrophin expression in the hippocampus accompanied by changes in epigenetic programming in senescence-accelerated mice. Neurosci Lett 2017; 665:67-73. [PMID: 29129676 DOI: 10.1016/j.neulet.2017.11.023] [Citation(s) in RCA: 35] [Impact Index Per Article: 5.0] [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: 06/23/2017] [Revised: 11/07/2017] [Accepted: 11/08/2017] [Indexed: 10/18/2022]
Abstract
Aerobic exercise is known to increase expression of neurotrophins, particularly brain-derived neurotrophic factor (BDNF), in the hippocampus and to improve cognitive function. Exercise exerts neuroprotective effects in the hippocampus by inducing epigenetic changes, which play crucial roles in aging and neurodegenerative diseases. Specifically, the activity levels of histone acetyltransferases (HATs) and histone deacetylases (HDACs) regulate histone acetylation and modulate gene transcription. The objective of the present study was to assess the interactive effects of exercise and aging on cognitive function, expression of neurotrophins (BDNF and neurotrophin-4) and their receptors (tyrosine receptor kinase B and p75), and epigenetic regulations, including the activity of HATs and HADCs in the hippocampus. We used the senescence-accelerated mouse (SAM) model, specifically 13-month-old SAM resistant 1(SAMR1) and SAM prone 1 (SAMP1) lines. Mice were distributed into four groups based on accelerated senescence and exercise status. Mice in the exercise groups exercised on a treadmill for approximately 60min a day, 5days a week. Aerobic exercise for 4 weeks improved cognitive function, accompanied by an increase in BDNF expression and a decrease in p75 transcription in both SAMR1 and SAMP1. In addition, the exercise regimen activated both HAT and HDAC in the hippocampus. Therefore, the present study reveals that despite accelerated senescence, long-term exercise improved cognitive function, upregulated the expression of BDNF, and downregulated p75, a receptor involved in apoptotic signaling. Furthermore, long-term exercise enhanced activity of both HAT and HDAC, which may contribute to the transcriptional regulation underlying the improvement of cognitive function.
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Affiliation(s)
- Hiroshi Maejima
- Department of Rehabilitation Science, Faculty of Health Sciences, Hokkaido University, Kita 12 Nishi 5, Kita-ku, Sapporo, 060-0812, Japan.
| | - Naohiko Kanemura
- Department of Physical Therapy, Faculty of Health and Social Services, Saitama Prefectural University, Sannomiya 820, Koshigaya, 343-8540, Japan
| | - Takanori Kokubun
- Department of Physical Therapy, Faculty of Health and Social Services, Saitama Prefectural University, Sannomiya 820, Koshigaya, 343-8540, Japan
| | - Kenji Murata
- Department of Physical Therapy, Faculty of Health and Social Services, Saitama Prefectural University, Sannomiya 820, Koshigaya, 343-8540, Japan
| | - Kiyomi Takayanagi
- Department of Physical Therapy, Faculty of Health and Social Services, Saitama Prefectural University, Sannomiya 820, Koshigaya, 343-8540, Japan
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Inoue T, Ninuma S, Hayashi M, Okuda A, Asaka T, Maejima H. Effects of long-term exercise and low-level inhibition of GABAergic synapses on motor control and the expression of BDNF in the motor related cortex. Neurol Res 2017; 40:18-25. [DOI: 10.1080/01616412.2017.1382801] [Citation(s) in RCA: 14] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/18/2022]
Affiliation(s)
- Takahiro Inoue
- Graduate School of Health Sciences, Hokkaido University, Sapporo, Japan
| | - Shuta Ninuma
- Department of Health Sciences, School of Medicine, Hokkaido University, Sapporo, Japan
| | - Masataka Hayashi
- Graduate School of Health Sciences, Hokkaido University, Sapporo, Japan
| | - Akane Okuda
- Department of Health Sciences, School of Medicine, Hokkaido University, Sapporo, Japan
| | - Tadayoshi Asaka
- Department of Rehabilitation Science, Faculty of Health Sciences, Hokkaido University, Sapporo, Japan
| | - Hiroshi Maejima
- Department of Rehabilitation Science, Faculty of Health Sciences, Hokkaido University, Sapporo, Japan
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Hasegawa N, Takeda K, Sakuma M, Mani H, Maejima H, Asaka T. Learning effects of dynamic postural control by auditory biofeedback versus visual biofeedback training. Gait Posture 2017; 58:188-193. [PMID: 28800501 DOI: 10.1016/j.gaitpost.2017.08.001] [Citation(s) in RCA: 12] [Impact Index Per Article: 1.7] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 03/03/2017] [Revised: 07/31/2017] [Accepted: 08/01/2017] [Indexed: 02/02/2023]
Abstract
Augmented sensory biofeedback (BF) for postural control is widely used to improve postural stability. However, the effective sensory information in BF systems of motor learning for postural control is still unknown. The purpose of this study was to investigate the learning effects of visual versus auditory BF training in dynamic postural control. Eighteen healthy young adults were randomly divided into two groups (visual BF and auditory BF). In test sessions, participants were asked to bring the real-time center of pressure (COP) in line with a hidden target by body sway in the sagittal plane. The target moved in seven cycles of sine curves at 0.23Hz in the vertical direction on a monitor. In training sessions, the visual and auditory BF groups were required to change the magnitude of a visual circle and a sound, respectively, according to the distance between the COP and target in order to reach the target. The perceptual magnitudes of visual and auditory BF were equalized according to Stevens' power law. At the retention test, the auditory but not visual BF group demonstrated decreased postural performance errors in both the spatial and temporal parameters under the no-feedback condition. These findings suggest that visual BF increases the dependence on visual information to control postural performance, while auditory BF may enhance the integration of the proprioceptive sensory system, which contributes to motor learning without BF. These results suggest that auditory BF training improves motor learning of dynamic postural control.
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Affiliation(s)
- Naoya Hasegawa
- Graduate School of Health Sciences, Hokkaido University, N12-W5, Kita-ku, Sapporo, Hokkaido 060-0812, Japan; Sapporo Yamanoue Hospital, Yamanote 6-9, Nishi-ku, Sapporo, Hokkaido 063-0006, Japan
| | - Kenta Takeda
- Graduate School of Health Sciences, Hokkaido University, N12-W5, Kita-ku, Sapporo, Hokkaido 060-0812, Japan
| | - Moe Sakuma
- Graduate School of Health Sciences, Hokkaido University, N12-W5, Kita-ku, Sapporo, Hokkaido 060-0812, Japan
| | - Hiroki Mani
- Department of Rehabilitation Science, Faculty of Health Sciences, Hokkaido University, N12-W5, Kita-ku, Sapporo, Hokkaido 060-0812, Japan
| | - Hiroshi Maejima
- Department of Rehabilitation Science, Faculty of Health Sciences, Hokkaido University, N12-W5, Kita-ku, Sapporo, Hokkaido 060-0812, Japan
| | - Tadayoshi Asaka
- Department of Rehabilitation Science, Faculty of Health Sciences, Hokkaido University, N12-W5, Kita-ku, Sapporo, Hokkaido 060-0812, Japan.
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Takeda K, Mani H, Hasegawa N, Sato Y, Tanaka S, Maejima H, Asaka T. Adaptation effects in static postural control by providing simultaneous visual feedback of center of pressure and center of gravity. J Physiol Anthropol 2017; 36:31. [PMID: 28724444 PMCID: PMC5518099 DOI: 10.1186/s40101-017-0147-5] [Citation(s) in RCA: 13] [Impact Index Per Article: 1.9] [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: 12/20/2016] [Accepted: 07/04/2017] [Indexed: 11/10/2022] Open
Abstract
Background The benefit of visual feedback of the center of pressure (COP) on quiet standing is still debatable. This study aimed to investigate the adaptation effects of visual feedback training using both the COP and center of gravity (COG) during quiet standing. Methods Thirty-four healthy young adults were divided into three groups randomly (COP + COG, COP, and control groups). A force plate was used to calculate the coordinates of the COP in the anteroposterior (COPAP) and mediolateral (COPML) directions. A motion analysis system was used to calculate the coordinates of the center of mass (COM) in both directions (COMAP and COMML). The coordinates of the COG in the AP direction (COGAP) were obtained from the force plate signals. Augmented visual feedback was presented on a screen in the form of fluctuation circles in the vertical direction that moved upward as the COPAP and/or COGAP moved forward and vice versa. The COP + COG group received the real-time COPAP and COGAP feedback simultaneously, whereas the COP group received the real-time COPAP feedback only. The control group received no visual feedback. In the training session, the COP + COG group was required to maintain an even distance between the COPAP and COGAP and reduce the COGAP fluctuation, whereas the COP group was required to reduce the COPAP fluctuation while standing on a foam pad. In test sessions, participants were instructed to keep their standing posture as quiet as possible on the foam pad before (pre-session) and after (post-session) the training sessions. Results In the post-session, the velocity and root mean square of COMAP in the COP + COG group were lower than those in the control group. In addition, the absolute value of the sum of the COP − COM distances in the COP + COG group was lower than that in the COP group. Furthermore, positive correlations were found between the COMAP velocity and COP − COM parameters. Conclusions The results suggest that the novel visual feedback training that incorporates the COPAP–COGAP interaction reduces postural sway better than the training using the COPAP alone during quiet standing. That is, even COPAP fluctuation around the COGAP would be effective in reducing the COMAP velocity.
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Affiliation(s)
- Kenta Takeda
- Graduate School of Health Sciences, Hokkaido University, N12-W5, Kita-ku, Sapporo, Hokkaido, 060-0812, Japan
| | - Hiroki Mani
- Department of Rehabilitation Science, Faculty of Health Sciences, Hokkaido University, N12-W5, Kita-ku, Sapporo, Hokkaido, 060-0812, Japan
| | - Naoya Hasegawa
- Graduate School of Health Sciences, Hokkaido University, N12-W5, Kita-ku, Sapporo, Hokkaido, 060-0812, Japan
| | - Yuki Sato
- Graduate School of Health Sciences, Hokkaido University, N12-W5, Kita-ku, Sapporo, Hokkaido, 060-0812, Japan
| | - Shintaro Tanaka
- Graduate School of Health Sciences, Hokkaido University, N12-W5, Kita-ku, Sapporo, Hokkaido, 060-0812, Japan
| | - Hiroshi Maejima
- Department of Rehabilitation Science, Faculty of Health Sciences, Hokkaido University, N12-W5, Kita-ku, Sapporo, Hokkaido, 060-0812, Japan
| | - Tadayoshi Asaka
- Department of Rehabilitation Science, Faculty of Health Sciences, Hokkaido University, N12-W5, Kita-ku, Sapporo, Hokkaido, 060-0812, Japan.
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Abstract
The authors aimed to characterize age-related changes in the performance of maximum reach and identify kinematic parameters that explain the age-related discrepancy between perceived and actual maximum reach distance. Maximum reach was evaluated in 22 younger women (21.3 years old) and 20 older women (81.2 years old). Both the perceived and actual maximum forward reach and forward excursion of the center of pressure was shorter in older women. Older women also overestimated their maximum reach distance to a greater extent. Decline of movement at the hip joint specifically correlated with both the maximum distance and the overestimation. Based on these results, decline of hip control may be a primary factor for the age-related retardation of perceived and actual maximum reach.
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Affiliation(s)
- Atsushi Okimoto
- a Graduate School of Health Sciences , Hiroshima University , Hiroshima , Japan.,b Department of Rehabilitation , Kure Nakadori Hospital , Kure , Japan
| | - Minoru Toriyama
- a Graduate School of Health Sciences , Hiroshima University , Hiroshima , Japan.,c Department of Tokyo Physical Therapy , Teikyo University of Science , Tokyo , Japan
| | - Masataka Deie
- a Graduate School of Health Sciences , Hiroshima University , Hiroshima , Japan.,d Department of Orthopedic Surgery , Aichi Medical University , Japan
| | - Hiroshi Maejima
- a Graduate School of Health Sciences , Hiroshima University , Hiroshima , Japan.,e Department of Rehabilitation Science , Faculty of Health Sciences, Hokkaido University , Sapporo , Japan
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Takahashi K, Maejima H, Ikuta G, Mani H, Asaka T. Exercise combined with low-level GABAA receptor inhibition up-regulates the expression of neurotrophins in the motor cortex. Neurosci Lett 2017; 636:101-107. [DOI: 10.1016/j.neulet.2016.10.052] [Citation(s) in RCA: 13] [Impact Index Per Article: 1.9] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/03/2016] [Revised: 10/17/2016] [Accepted: 10/26/2016] [Indexed: 12/11/2022]
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Maejima H, Kanemura N, Kokubun T, Murata K, Takayanagi K. Effects of Aging and Treadmill Exercise on the Expression of Neurotrophin and Glutamate Receptors in the Hippocampus. FASEB J 2015. [DOI: 10.1096/fasebj.29.1_supplement.1055.6] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/11/2022]
Affiliation(s)
- Hiroshi Maejima
- Fuculty of Health Sciences, Department of Rehabilitation ScienceHokkaido UniversitySapproHokkaidoJapan
| | - Naohiko Kanemura
- Department of Physical TherapySaitama Prefectural UniversityKoshigayaSaitamaJapan
| | - Takanori Kokubun
- Department of Physical TherapySaitama Prefectural UniversityKoshigayaSaitamaJapan
| | - Kenji Murata
- Department of Physical TherapySaitama Prefectural UniversityKoshigayaSaitamaJapan
| | - Kiyomi Takayanagi
- Department of Physical TherapySaitama Prefectural UniversityKoshigayaSaitamaJapan
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Maejima H, Kanetada Y, Sunahori H, Murase A, Otani T, Sakamoto N, Yoshimura O, Tobimatsu Y. The effects of comprehensive exercise program on the adjustments of standing balance in community-dwelling elderly persons. J Jpn Phys Ther Assoc 2015; 11:7-13. [PMID: 25792884 DOI: 10.1298/jjpta.11.7] [Citation(s) in RCA: 6] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Received: 09/05/2005] [Accepted: 10/12/2007] [Indexed: 11/23/2022]
Abstract
The objective of this study was to assess the effect of comprehensive exercise program widely accepted as a community-based physical intervention for the prevention of falling in the elderly persons on their controlling standing balance. Twenty-six community-dwelling elderly persons (13 males and females; 69.8 ± 2.8 years old) participated in this study. Daily exercise was comprised of walking for more than 30 min, stretching, muscle strengthening and balance exercise without exercise equipments. The intervention was continued for three months. Indicators of standing balance related to static balance, dynamic balance and postural response were measured before and after the intervention. As an effect of the intervention on static balance, the sway of center of pressure (COP) in the static stance significantly increased. In the dynamic balance, significant improvements were observed in one leg standing time, the 10-m gait time, functional reach. Additionally, the maximal movable length of COP which subjects can move voluntarily to right and left significantly increased. In the postural response, the integrated electromyography (IEMG) induced by postural response for sudden postural perturbation significantly decreased in the lower leg muscles. Since less muscular activities were sufficient to maintain posture, it was suggested that postural response was elicited more efficiently following the intervention. This study suggested that the comprehensive exercise program, which has been widely introduced as community-based interventions for the prevention of falling, have extensive effects on the control of standing balance covering static balance, dynamic balance and postural response in the elderly persons.
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Affiliation(s)
- Hiroshi Maejima
- Division of Physical Therapy and Occupational Therapy Sciences, Graduate School of Health Sciences, Hiroshima University, Hiroshima 734-8551, Japan
| | - Yuji Kanetada
- Hatsudai Rehabilitation Hospital, Tokyo 151-0071, Japan
| | - Hitoshi Sunahori
- Hiroshima City General Rehabilitation Center, Hiroshima 731-3168, Japan
| | | | - Takuya Otani
- Division of Physical Therapy and Occupational Therapy Sciences, Graduate School of Health Sciences, Hiroshima University, Hiroshima 734-8551, Japan
| | - Nozomi Sakamoto
- Hiroshima City General Rehabilitation Center, Hiroshima 731-3168, Japan
| | - Osamu Yoshimura
- Hiroshima City General Rehabilitation Center, Hiroshima 731-3168, Japan
| | - Yoshiko Tobimatsu
- Division of Physical Therapy and Occupational Therapy Sciences, Graduate School of Health Sciences, Hiroshima University, Hiroshima 734-8551, Japan
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Maejima H, Kanemura N, Kokubun T, Murata K, Takayanagi K. Effects of aging and low‐load balance exercise on the expression of neurotrophins and glutamate receptors in the mouse brain. FASEB J 2013. [DOI: 10.1096/fasebj.27.1_supplement.1132.3] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/11/2022]
Affiliation(s)
- Hiroshi Maejima
- Faculty of Medical SciencesTeikyo University of ScienceTokyoJapan
| | - Naohiko Kanemura
- Department of Physical TherapySaitama Prefectural UniversitySaitamaJapan
| | - Takanori Kokubun
- Department of Physical TherapySaitama Prefectural UniversitySaitamaJapan
| | - Kenji Murata
- Department of Physical TherapySaitama Prefectural UniversitySaitamaJapan
| | - Kiyomi Takayanagi
- Department of Physical TherapySaitama Prefectural UniversitySaitamaJapan
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Takayanagi K, Kanemura N, Kokubun T, Maejima H, Nishikawa Y, Ihara H. Possibility of natural healing to anterior cruciate ligament tear. FASEB J 2013. [DOI: 10.1096/fasebj.27.1_supplement.749.11] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/11/2022]
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27
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Kokubun T, Kanemura N, Maejima H, Fujino T, Morita S, Takayanagi K. Early protective joint motion influences gene expression in a rat model of anterior cruciate complete rupture. FASEB J 2013. [DOI: 10.1096/fasebj.27.1_supplement.685.1] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/11/2022]
Affiliation(s)
| | | | | | | | - Sadao Morita
- Rehabilitation MedichineTokyo Medical and Dental UniversityTokyoJapan
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28
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Kanemura N, Imagita H, Maejima H, Kokubun T, Murata K, Takayanagi K. Exercise on a moving platform elicits different gene expression of neurotrophins and receptors in the spinal cord of aged rats. FASEB J 2013. [DOI: 10.1096/fasebj.27.1_supplement.833.4] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/11/2022]
Affiliation(s)
- Naohiko Kanemura
- School of Health and Social ServicesSaitama Prefectural UniversityKoshigaya‐CityJapan
| | | | | | - Takanori Kokubun
- School of Health and Social ServicesSaitama Prefectural UniversityKoshigaya‐CityJapan
| | - Kenji Murata
- School of Health and Social ServicesSaitama Prefectural UniversityKoshigaya‐CityJapan
| | - Kiyomi Takayanagi
- School of Health and Social ServicesSaitama Prefectural UniversityKoshigaya‐CityJapan
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Hayami H, Mizutani K, Shioda M, Takaki S, Maejima H, Ueno K, Yamaguchi Y, Kariya T, Gotoh T. Use of high-flow nasal canulae: effect on alveolar pressure and its limitation. Crit Care 2013. [PMCID: PMC3643167 DOI: 10.1186/cc12029] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Download PDF] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/04/2022] Open
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30
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Toriyama M, Deie M, Shimada N, Otani T, Shidahara H, Maejima H, Moriyama H, Shibuya H, Okuhara A, Ochi M. Effects of unloading bracing on knee and hip joints for patients with medial compartment knee osteoarthritis. Clin Biomech (Bristol, Avon) 2011; 26:497-503. [PMID: 21324572 DOI: 10.1016/j.clinbiomech.2011.01.003] [Citation(s) in RCA: 23] [Impact Index Per Article: 1.8] [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] [Received: 05/31/2010] [Revised: 01/13/2011] [Accepted: 01/13/2011] [Indexed: 02/07/2023]
Abstract
BACKGROUND Osteoarthritis affects the whole body, thus biomechanical effects on other joints should be considered. Unloading knee braces could be effective for knee osteoarthritis, but their effects on the contralateral knee and bilateral hip joints remain unknown. This study investigated the effects of bracing on the kinematics and kinetics of involved and contralateral joints during gait. METHODS Nineteen patients with medial compartment knee osteoarthritis were analysed. Kinematics and kinetics of the knee and hip joints in frontal and sagittal planes were measured during walking without and with bracing on the more symptomatic knee. FINDINGS The ipsilateral hip in the braced condition showed a lower adduction angle by an average of 2.58° (range, 1.05°-4.16°) during 1%-49% of the stance phase, and a lower abduction moment at the second peak during the stance phase than the hip in the unbraced condition (P<0.05 and P<0.005, respectively). With bracing, the contralateral hip showed a more marked peak extension moment and lower abduction moment at the first peak (P<0.05), and the contralateral knee adduction angle increased by an average of 0.32° (range, 0.21°-0.45°) during 46%-55% of the stance phase (P<0.05), compared to no bracing. INTERPRETATION Unloading bracing modified the contralateral knee adduction angle pattern at a specific time point during gait. It also affected the frontal plane on the ipsilateral hip and the frontal and sagittal planes on the contralateral hip joint. Consideration should be provided to other joints when treating knee osteoarthritis.
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Affiliation(s)
- Minoru Toriyama
- Graduate School of Health Sciences, Hiroshima University, 1-2-3 Kasumi, Minami-ku, Hiroshima, Japan
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31
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Otani T, Maejima H, Tobimatsu Y, Shimada N, Toriyama M, Deie M. Synaptogenesis in the Contralateral Primary Motor Area after Focal Brain Infarction in Rats. J Phys Ther Sci 2010. [DOI: 10.1589/jpts.22.69] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/24/2022] Open
Affiliation(s)
- Takuya Otani
- Graduate School of Health Sciences, Hiroshima University
| | | | | | - Noboru Shimada
- Graduate School of Health Sciences, Hiroshima University
| | | | - Masataka Deie
- Graduate School of Health Sciences, Hiroshima University
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32
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Maejima H, Sunahori H, Kanetada Y, Murase A, Tobimatsu Y, Otani T, Yoshimura O. The neural adjustment of postural response through community-based daily exercises in elderly persons. Clin Biomech (Bristol, Avon) 2009; 24:499-503. [PMID: 19364622 DOI: 10.1016/j.clinbiomech.2009.03.007] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.2] [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] [Received: 04/13/2008] [Revised: 03/13/2009] [Accepted: 03/13/2009] [Indexed: 02/07/2023]
Abstract
BACKGROUND Reflecting the rapidly aging population, community-based interventions in the form of physical exercise have been introduced to promote the health of elderly persons and prevent falls. Postural response is the critical neural response for preventing falls. The objective of this study was to assess the effect of long-term daily exercise on neural adjustment in postural response elucidated by sudden postural perturbation. METHODS Twenty-six community-based elderly persons (13 men and women; 69.8+/-0.5 years old) participated in this study. Daily exercise was composed of walking for longer than 30 min, stretching, muscle strengthening and balance exercise, and was continued for 3 months. Postural responses were induced by fore or aft horizontal displacement of a platform with a force plate. Center of pressure on the force plate and electromyography of the rectus femoris, tibia anterior, biceps femoris and gastrocnemius were measured in postural response. FINDINGS Following the 3 months of physical intervention, the amplitude and timing of the center of pressure excursion did not change, whereas the amplitude of muscular activities of the lower leg muscles required for the response significantly decreased. Furthermore, the onset of muscular activation of the lower leg muscles was significantly shortened following the intervention. INTERPRETATION In conclusion, we showed that a program composed of 3 months of comprehensive exercise modulated the output of the postural response through a neural adjustment in the timing and amplitude of the muscular activation.
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Affiliation(s)
- Hiroshi Maejima
- Graduate School of Health Sciences Hiroshima University, 1-2-3 Kasumi Minami-ku, Hiroshima 734-8551, Japan.
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33
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Maejima H, Sunahori H, Otani T, Sakamoto N, Yoshimura O, Tobimatsu Y. Effect of long-term, community-based daily exercise on the ability to control the dynamic standing balance of Japanese elderly persons in relation to falls. Nurs Health Sci 2009; 11:128-34. [DOI: 10.1111/j.1442-2018.2009.00453.x] [Citation(s) in RCA: 5] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/30/2022]
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34
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Hadoush H, Tobimatsu Y, Nagatomi A, Kimura H, Ito Y, Maejima H. Monopolar surface electromyography: a better tool to assess motoneuron excitability upon passive muscle stretching. J Physiol Sci 2009; 59:243-7. [PMID: 19340538 PMCID: PMC10717350 DOI: 10.1007/s12576-009-0027-9] [Citation(s) in RCA: 9] [Impact Index Per Article: 0.6] [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: 11/30/2008] [Accepted: 02/01/2009] [Indexed: 10/20/2022]
Abstract
Bipolar and monopolar surface electromyography (sEMG) are known procedures to measure the H-reflex. However, signal cancellation is a potential experimental problem of bipolar sEMG. The results of our study show that monopolar sEMG was the more sensitive procedure to differentiate motoneuron excitability at different passive muscle stretching speeds as it overcame signal cancellation.
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Affiliation(s)
- Hikmat Hadoush
- Graduate School of Health Sciences, Hiroshima University, 1-2-3 Kasumi, Minami-ku, Hiroshima, 734-8551 Japan
| | - Yoshiko Tobimatsu
- Graduate School of Health Sciences, Hiroshima University, 1-2-3 Kasumi, Minami-ku, Hiroshima, 734-8551 Japan
| | - Akiyoshi Nagatomi
- Department of Physical Medicine and Rehabilitation, Hiroshima University Hospital, Hiroshima, Japan
| | - Hiroaki Kimura
- Department of Physical Medicine and Rehabilitation, Hiroshima University Hospital, Hiroshima, Japan
| | - Yoshihiro Ito
- Department of Physical Medicine and Rehabilitation, Hiroshima University Hospital, Hiroshima, Japan
| | - Hiroshi Maejima
- Graduate School of Health Sciences, Hiroshima University, 1-2-3 Kasumi, Minami-ku, Hiroshima, 734-8551 Japan
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35
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Nakao Y, Narazaki G, Hoshino T, Maeda S, Yoshida M, Maejima H, Yamashita JK. Evaluation of antiangiogenic activity of azumamides by the in vitro vascular organization model using mouse induced pluripotent stem (iPS) cells. Bioorg Med Chem Lett 2008; 18:2982-4. [PMID: 18397826 DOI: 10.1016/j.bmcl.2008.03.053] [Citation(s) in RCA: 15] [Impact Index Per Article: 0.9] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/12/2008] [Revised: 03/03/2008] [Accepted: 03/18/2008] [Indexed: 10/22/2022]
Abstract
Evaluation of antiangiogenic activity of marine sponge derived azumamides by the in vitro vascular organization model using mouse induced pluripotent stem (iPS) cells was carried out. Azumamide E (5) strongly inhibited in vitro angiogenesis from iPS cells at 1.9microM while azumamide A (1) showed only weak inhibition at 19microM. These results were well correlated with HDAC inhibitory activity of these compounds, revealing the prospect of azumamides as the probe molecules useful for stem cell chemical biology.
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Affiliation(s)
- Yoichi Nakao
- Department of Chemistry and Biochemistry, Waseda University, 3-4-1 Okubo, Shinjuku-ku, Tokyo 169-8555, Japan.
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36
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Saka Y, Yoshimura O, Tahara H, Takeda Y, Moriyama H, Maejima H, Tobimatsu Y. The mRNA expression of neurotrophins in different skeletal muscles of young rats. Hiroshima J Med Sci 2007; 56:23-28. [PMID: 18516930] [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] [Subscribe] [Scholar Register] [Indexed: 05/26/2023]
Abstract
Skeletal muscles are a target for motoneurons and synthesize neurotrophins, including nerve growth factor (NGF), brain-derived neurotrophic factor (BDNF), neurotrophin-3 (NT-3), and neurotrophin-4/5 (NT-4/5). Both at the embryonic stage and the adult stage, the mRNA expression of neurotrophins in skeletal muscles of rats has been reported. However, little was known about the mRNA expression patterns of neurotrophins in skeletal muscles of rats at the young developmental stage. In this study, we investigated the mRNA expressions of BDNF and NT-3 in three different skeletal muscles in 4- to 8- week-old rats using the reverse transcriptional polymerase chain reaction (RT-PCR) method. The expression of BDNF mRNA in the soleus muscle gradually became higher with age from 5 to 8 weeks. But BDNF mRNA in the tibialis anterior and extensor digitorum longus muscles did not change with growth. The expression of NT-3 mRNA did not show a specific tendency during this period. The differences of muscle fiber types, recruitment patterns of the muscles, and roles of neurotrophins may cause these mRNA expression patterns. Neurotrophins are target-derived, activity-dependent neurotrophic factors and are transported retrogradely. There is a possibility that the different expression patterns of neurotrophins in muscles may be involved in the maturation of neuromuscular function in different muscles during the young developmental period.
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Affiliation(s)
- Yukari Saka
- Graduate School of Health Sciences, Hiroshima University, Hiroshima 734-8551, Japan.
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37
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Maejima H, Murase A, Sunahori H, Kanetada Y, Otani T, Yoshimura O, Tobimatsu Y. Neural Adjustment in the Activation of the Lower Leg Muscles through Daily Physical Exercises in Community-Based Elderly Persons. TOHOKU J EXP MED 2007; 211:141-9. [PMID: 17287598 DOI: 10.1620/tjem.211.141] [Citation(s) in RCA: 6] [Impact Index Per Article: 0.4] [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: 11/18/2022]
Abstract
Reflecting the rapidly aging population, community-based interventions in the form of physical exercise have been introduced to promote the health of elderly persons. Many investigation studies have focused on muscle strength in the lower leg as a potent indicator of the effect of physical exercises. The objective of this study was to assess the effect of long-term daily exercises on neural command in lower leg muscle activations. Twenty-six community-based elderly persons (13 men and 13 women; 69.8 +/- 0.5 years old) participated in this study. Daily exercise was comprised of walking for more than 30 min, stretching, muscle strengthening and balance exercise, and was continued for three months. Muscle strength and surface electromyography of the tibia anterior, rectus femoris, and biceps femoris were measured in maximum isometric voluntary contraction both before and after the intervention. The mean frequency of the firing of motor units was calculated based on fast Fourier transformation of the electromyography. As the results of the intervention, muscle strength increased significantly only in biceps femoris, whereas the mean frequency of motor units decreased significantly in every muscle, indicating that motor unit firing in lower frequency efficiently induces the same or greater strength compared with before the intervention. Thus, synchronization of motor units compensates for the lower frequency of motor unit firing to maintain muscular strength. In conclusion, long-term physical exercises in the elderly can modulate the neural adjustment of lower leg muscles to promote efficient output of muscle strength.
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Affiliation(s)
- Hiroshi Maejima
- Division of Physical Therapy and Occupational Therapy Sciences, Graduate School of Health Sciences, Hiroshima University, Japan.
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38
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Moriguchi S, Shioda N, Maejima H, Zhao X, Marszalec W, Yeh JZ, Fukunaga K, Narahashi T. Nefiracetam potentiates N-methyl-D-aspartate (NMDA) receptor function via protein kinase C activation and reduces magnesium block of NMDA receptor. Mol Pharmacol 2006; 71:580-7. [PMID: 17095583 DOI: 10.1124/mol.106.027607] [Citation(s) in RCA: 28] [Impact Index Per Article: 1.6] [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: 11/22/2022] Open
Abstract
Nicotinic acetylcholine receptors and N-methyl-D-aspartate (NMDA) receptors are known to be down-regulated in the brain of Alzheimer's disease patients. We have previously demonstrated that the nootropic drug nefiracetam potentiates the activity of both nicotinic acetylcholine and NMDA receptors and that nefiracetam modulates the glycine binding site of the NMDA receptor. Because the NMDA receptor is also modulated by Mg2+ and protein kinases, we studied their roles in nefiracetam action on the NMDA receptor by the whole-cell patch-clamp technique and immunoblotting analysis using rat cortical or hippocampal neurons in primary culture. The nefiracetam potentiation of NMDA currents was inhibited by the protein kinase C (PKC) inhibitor chelerythrine, but not by the protein kinase A (PKA) inhibitor N-[2-(4-bromocinnamylamino)ethyl]-5-isoquinoline (H89). In immunoblotting analysis, nefiracetam treatment increased the PKCalpha activity with a bell-shaped dose-response relationship peaking at 10 nM, thereby increasing phosphorylation of PKC substrate and NMDA receptor. Such an increase in PKCalpha-mediated phosphorylation was prevented by chelerythine. Nefiracetam treatment did not affect the PKA activity. Analysis of the current-voltage relationships revealed that nefiracetam at 10 nM largely eliminated voltage-dependent Mg2+ block and that this action of nefiracetam was sensitive to PKC inhibition. It was concluded that nefiracetam potentiated NMDA currents not by acting as a partial agonist but by interacting with PKC, allosterically enhancing glycine binding, and attenuating voltage-dependent Mg2+ block.
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Affiliation(s)
- Shigeki Moriguchi
- Department of Molecular Pharmacology and Biological Chemistry, Northwestern University Medical School, 303 E. Chicago Ave., Chicago, IL 60611-3008, USA
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Moriyama H, Yoshimura O, Sunahori H, Nitta H, Imakita H, Saka Y, Maejima H, Tobimatsu Y. Progression and Direction of Contractures of Knee Joints Following Spinal Cord Injury in the Rat. TOHOKU J EXP MED 2004; 204:37-44. [PMID: 15329461 DOI: 10.1620/tjem.204.37] [Citation(s) in RCA: 15] [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] [Subscribe] [Scholar Register] [Indexed: 11/18/2022]
Abstract
Joint contractures following central nervous system injuries remain a prevalent and significant complication, but no reports are available on evidence of contracture formation over time. The objective of this study was to determine the rate of contracture progression and the direction of loss in joint movement following spinal cord injuries (SCI). Forty-eight female Wistar rats were used. Twenty-four experimental rats underwent a spinal cord transection at the level of T8 and 24 control rats underwent a sham-operation. The animals were studied at each of 5 time points: 2, 4, 8, 12, 16, and 24 weeks after surgical intervention. The degree of contractures was assessed by measuring the femorotibial angle on both hindlimbs with the use of a goniometer. Knee joint motion was measured for flexion and extension direction. Knee flexion contractures developed in all experimental rats. The restriction in motion progressed during the first 12 weeks and plateaued thereafter. The contractures were produced almost exclusively by a loss in the extension range of motion. This study defined the time course that contracture progression was more rapid in the early stage after SCI and stabilized in the later stage of injury. Contractures following SCI occurred in flexion at the knees and resulted from a loss of extension. These findings should help guide timely treatment and provide a better understanding of contracture development.
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Affiliation(s)
- Hideki Moriyama
- Graduate School of Health Science, Hiroshima University, Japan.
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40
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Maejima H, Takeishi K, Sunahori H, Yamawaki A, Nakajima K, Yoshimura O. The Relationship between Postural Deformation and Standing Balance in Elderly Person. J Jpn Phys Ther Assoc 2004; 7:7-14. [PMID: 25792932 PMCID: PMC4316517 DOI: 10.1298/jjpta.7.7] [Citation(s) in RCA: 7] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Received: 12/02/2002] [Accepted: 05/09/2003] [Indexed: 11/23/2022]
Abstract
Falling due to unstable standing balance is considered to be the main cause of bone fractures, which lead elderly persons to becoming bedridden. Thus, the standing balance of elderly persons is being given increasingly greater attention. On the other hand, postural deformation caused by deformation in the spine and lower leg joints is considered to have an effect on standing balance. The objective of this study is to clarify the effect of postural deformation on the following three categories of standing balance; 1) the ability to immobilize Center of Gravity (COG) in standing statically, 2) the ability to control COG during movement and 3) the postural response induced by postural sway. Fifty elderly persons (age:77.7 ± 6.4 years old, fifty females) participated in this study. Postural deformation was measured using a Spinal Mouse, a device for non-invasive measurement of spinal curvature and photographic image in sagittal plane. In line with to Nakata's classification of postural deformation, subjects were classified by extension type, S-character deformation type, flexion type, hands on the knee type and normal group. In order to assess the ability to immobilize COG in static standing, Center of Pressure (COP) in static standing was measured for 30 sec. In order to assess the ability to control COG during movement, functional reach, maximal length of stride and the period of 10 m gait were measured. Postural response was induced by fore-aft perturbation of the platform on which the subjects stood. Postural responses were assessed by measuring both COP, and electromyography (EMG) of muscles in the lower legs. There was little significant difference among the five groups concerning postural deformation in every measured item, neither in the ability to immobilize COP in static standing, nor in the postural response induced by postural sway. However, the results of measured items concerning the ability to control COG during movement were significantly worse in flexion type and hands on the knee type compared with the normal group. It was suggested that postural deformation in elderly persons effects exclusively on the ability to control COG during movement in standing balance.
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Affiliation(s)
- Hiroshi Maejima
- Institute of Health Sciences, Hiroshima University School of Medicine, Hiroshima 734-8551, Japan
| | | | - Hitoshi Sunahori
- Institute of Health Sciences, Hiroshima University School of Medicine, Hiroshima 734-8551, Japan
| | - Akiko Yamawaki
- Center for Total Health and Warfare, Saijyo City, Hiroshima 729-5742, Japan
| | - Kiyomi Nakajima
- Division of Rehabilitation, Saijyo City Hospital, Hiroshima 729-5742, Japan
| | - Osamu Yoshimura
- Institute of Health Sciences, Hiroshima University School of Medicine, Hiroshima 734-8551, Japan
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Minematsu A, Yoshimura O, Maejima H, Miyamoto T. Change of bone mechanical strength in rats after spinal cord injury over a short term. Hiroshima J Med Sci 2003; 52:21-5. [PMID: 12971626] [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] [Subscribe] [Scholar Register] [Indexed: 03/04/2023]
Abstract
This study investigated the time-course of changes in bone mechanical strength in rats with spinal cord injury (SCI). Sixty-four male Wistar rats underwent spinal cord transection at the thoracic nerve. Control rats underwent a sham procedure (SHAM). Animals were sacrificed at day 1, 4, 7 and 14 after operation. The mechanical strength of the left femur and tibia was measured by the three-point bending strength test. The bones were dried, weighed and burned to ash. A specimen of right tibia was prepared and examined under a microscope. Bone mechanical strength, dry bone weight, and ash content of the femur and tibia in SCI rats were significantly lower than those in SHAM animals. Dry bone weight and ash content began to decrease from the 4th day after SCI and reached their lowest at day 7 after operation. Bone mechanical strength had reduced significantly by the 14th day. Gaps and spaces were observed in the trabecular area at the same time. After SCI, calcified cartilage decreased and the reduction of bone mass occurred rapidly. Moreover, a decline of bone mechanical strength is caused within 2 weeks. Thus, SCI led to the atrophy of bone and caused the reduction of mechanical strength at an early stage. It is thus necessary to prevent bone loss after SCI immediately.
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Affiliation(s)
- Akira Minematsu
- Department of Physical Therapy, Faculty of Health Science, Kio University, Kitakatsuragi-gun, Nara, Japan.
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42
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Maejima H, Kinoshita E, Seyama I, Yamaoka K. Distinct sites regulating grayanotoxin binding and unbinding to D4S6 of Na(v)1.4 sodium channel as revealed by improved estimation of toxin sensitivity. J Biol Chem 2003; 278:9464-71. [PMID: 12524436 DOI: 10.1074/jbc.m212133200] [Citation(s) in RCA: 50] [Impact Index Per Article: 2.4] [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: 11/06/2022] Open
Abstract
Grayanotoxin (GTX) exerts selective effects on voltage-dependent sodium channels by eliminating fast sodium inactivation and causing a hyperpolarizing shift in voltage dependence of channel activation. In this study, we adopted a newly developed protocol that provides independent estimates of the binding and unbinding rate constants of GTX (k(on) and k(off)) to GTX sites on the sodium channel protein, important in the molecular analysis of channel modification. Novel GTX sites were determined in D2S6 (Asn-784) and D3S6 (Ser-1276) by means of site-directed mutagenesis; the results suggested that the GTX receptor consists of the S6 transmembrane segments of four homologous domains facing the ion-conducting pore. We systematically introduced at two sites in D4S6 (Na(v)1.4-Phe-1579 and Na(v)1.4-Tyr-1586) amino acid substituents with residues containing hydrophobic, aromatic, charged, or polar groups. Generally, substitutions at Phe-1579 increased both k(on) and k(off), resulting in no prominent change in dissociation constant (K(d)). It seems that the smaller the molecular size of the residue at Na(v)1.4-Phe-1579, the larger the rates of k(on) and k(off), indicating that this site acts as a gate regulating access of toxin molecules to a receptor site. Substitutions at Tyr-1586 selectively increased k(off) but had virtually no effect on k(on), thus causing a drastic increase in K(d). At position Tyr-1586, a hydrophobic or aromatic amino acid side chain was required to maintain normal sensitivity to GTX. These results suggest that the residue at position Tyr-1586 has a more critical role in mediating GTX binding than the one at position Phe-1579. Here, we propose that the affinity of GTX to Na(v)1.4 sodium channels might be regulated by two residues (Phe and Tyr) at positions Phe-1579 and Tyr-1586, which, respectively, control access and binding of GTX to its receptor.
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Affiliation(s)
- Hiroshi Maejima
- Institute of Health Sciences and the Department of Physiology, School of Medicine, Hiroshima University, Kasumi 1-2-3, Minami-ku, Hiroshima 734-8551, Japan
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Maejima H, Kinoshita E, Yuki T, Yakehiro M, Seyama I, Yamaoka K. Structural determinants for the action of grayanotoxin in D1 S4-S5 and D4 S4-S5 intracellular linkers of sodium channel alpha-subunits. Biochem Biophys Res Commun 2002; 295:452-7. [PMID: 12150970 DOI: 10.1016/s0006-291x(02)00702-7] [Citation(s) in RCA: 10] [Impact Index Per Article: 0.5] [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: 11/20/2022]
Abstract
We located a novel binding site for grayanotoxin on the cytoplasmic linkers of voltage-dependent cardiac (rH1) or skeletal-muscle (mu 1) Na(+) channel isoforms (segments S4-S5 in domains D1 and D4), using the alanine scanning substitution method. GTX-modification of Na(+) channels, transiently expressed in HEK 293 cells, was evaluated under whole-cell voltage clamp, from the ratio of maximum chord conductance for modified and unmodified Na(+) channels. In mu 1, mutations K237A, L243A, S246A, K248A, K249A, L250A, S251A, or T1463A, caused a moderate, but statistically significant decrease in this ratio. On making corresponding mutations in rH1, only L244A dramatically reduced the ratio. Because in mu 1, the serine at position 251 is the only heterologous residue with respect to rH1 (Ala-252), we made a double mutant L243A&S251A to match the sequence of mu 1 and rH1 in S4-S5 linkers of both domains. This double mutation resulted in a significant decrease in the ratio, to the same extent as L244A substitution in rH1 did, indicating that the site at Leu-244 in rH1 or at Leu-243 in mu 1 is a novel one, exhibiting a synergistic effect of grayanotoxin.
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Affiliation(s)
- Hiroshi Maejima
- Institute of Health Sciences, School of Medicine, Hiroshima University, Hiroshima, Kasumi 1-2-3, Hiroshima 734-8551, Japan
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Kawagoe H, Yamaoka K, Kinoshita E, Fujimoto Y, Maejima H, Yuki T, Seyama I. Molecular basis for exaggerated sensitivity to mexiletine in the cardiac isoform of the fast Na channel. FEBS Lett 2002; 513:235-41. [PMID: 11904157 DOI: 10.1016/s0014-5793(02)02320-7] [Citation(s) in RCA: 6] [Impact Index Per Article: 0.3] [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: 11/17/2022]
Abstract
Cardiac sodium channels have been shown to have a higher sensitivity to local anesthetic agents, such as lidocaine, than the sodium channels of other tissues. To examine if this is also true for mexiletine, we have systematically measured mexiletine sensitivity of the Na channel isoforms, rH1, (mu)1, and rBII, which were transiently expressed in human embryonic kidney (HEK) 293 cells. We confirmed that the cardiac isoform rH1 exhibited the highest sensitivity among the three tested channel isoforms. In rH1, (mu)1, and rBII, the respective IC(50) values were 62, 294, and 308 microM mexiletine, in regard to tonic block, and 18, 54, and 268 microM mexiletine, in relation to use (8 Hz)-dependent block. The relatively high drug sensitivity of rH1 was an invariant finding, irrespective of channel state or whether channels were subjected to infrequent or frequent depolarizing stimuli. Mutating specific amino acids in the skeletal muscle isoform (mu)1 (namely, (mu)1-I433V and (mu)1-S251A) to those of the cardiac isoform at putative binding sites for local anesthetic agents revealed that only one of the point mutations ((mu)1-S251A) has relevance to the high cardiac drug sensitivity, because mexiletine produced significantly more use-dependent and tonic block in (mu)1-S251A than wild-type (mu)1.
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Affiliation(s)
- Hiroyuki Kawagoe
- Department of Physiology, School of Medicine, Hiroshima University, Kasumi 1-2-3, Minami-ku, 734-8551, Hiroshima, Japan
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Kanemura N, Kobayashi R, Kajihara H, Minematu A, Sasaki H, Tanaka S, Shirahama K, Miyamoto H, Watanabe M, Yata K, Moriyama H, Maejima H, Yoshimura O. Changes of Mechanoreceptor in Anterior Cruciate Ligament with Hindlimb Suspension Rats. J Phys Ther Sci 2002. [DOI: 10.1589/jpts.14.27] [Citation(s) in RCA: 7] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/24/2022] Open
Affiliation(s)
- Naohiko Kanemura
- Graduate school of Medical Sciences, Health Sciences Major, Hiroshima University School of Medicine
| | - Ryuji Kobayashi
- Faculty of Rehabilitation, School of Allied Health Sciences, Kitasato University
| | - Hiroki Kajihara
- Institute of Health Sciences, Hiroshima University School of Medicine
| | | | - Hisato Sasaki
- Graduate school of Medical Sciences, Health Sciences Major, Hiroshima University School of Medicine
| | - Sachiko Tanaka
- Graduate school of Medical Sciences, Health Sciences Major, Hiroshima University School of Medicine
| | - Kunji Shirahama
- Graduate school of Medical Sciences, Health Sciences Major, Hiroshima University School of Medicine
| | - Hidetaka Miyamoto
- Graduate school of Medical Sciences, Health Sciences Major, Hiroshima University School of Medicine
| | - Makoto Watanabe
- Graduate school of Medical Sciences, Health Sciences Major, Hiroshima University School of Medicine
| | - Kaori Yata
- Graduate school of Medical Sciences, Health Sciences Major, Hiroshima University School of Medicine
| | - Hideki Moriyama
- Graduate school of Medical Sciences, Health Sciences Major, Hiroshima University School of Medicine
| | - Hiroshi Maejima
- Institute of Health Sciences, Hiroshima University School of Medicine
| | - Osamu Yoshimura
- Institute of Health Sciences, Hiroshima University School of Medicine
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Kimura T, Yamaoka K, Kinoshita E, Maejima H, Yuki T, Yakehiro M, Seyama I. Novel site on sodium channel alpha-subunit responsible for the differential sensitivity of grayanotoxin in skeletal and cardiac muscle. Mol Pharmacol 2001; 60:865-72. [PMID: 11562450] [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: 02/21/2023] Open
Abstract
We searched for sites on the alpha-subunit of the fast Na(+) channel responsible for the difference in GTX (grayanotoxin) sensitivity of the skeletal- and cardiac-muscle Na(+) current. cDNA clones, encoding the skeletal or cardiac isoforms of the alpha-subunit, were inserted into a mammalian expression vector and transiently transfected into human embryonic kidney cells. The expressed channels were measured using whole-cell patch-clamp techniques and examined for GTX sensitivity. As a measure of GTX sensitivity, we used relative chord conductance (ratio of maximum chord conductance of noninactivating GTX-modified Na(+) currents to that of unmodified peak currents). Wild-type channels from skeletal muscle (mu 1) were more sensitive to GTX modification than wild-type cardiac channels (rH1) by a factor of 1.6. To facilitate exploration of alpha-subunit sites determining GTX sensitivity, we used SHHH, a chimera of skeletal muscle (S) domain D1 and heart muscle (H) domains D2D3D4 with supernormal sensitivity to GTX I (1.5-fold of wild-type mu 1). Successive replacement of Ser-251 (D1S4-S5 intracellular loop) and Ile-433 (D1S6 transmembrane segment), with corresponding rH1 residues Ala and Val, reduced, in a stepwise manner, the GTX sensitivity of the chimera and related mutants to that of wild-type rHl. We concluded that, in addition to Ile-433, known as the GTX-binding site, Ser-251 represents a novel site for GTX modification.
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Affiliation(s)
- T Kimura
- Department of Physiology, School of Medicine, Hiroshima University, Kasumi, Hiroshima, Japan
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Kinoshita E, Maejima H, Yamaoka K, Konno K, Kawai N, Shimizu E, Yokote S, Nakayama H, Seyama I. Novel Wasp Toxin Discriminates between Neuronal and Cardiac Sodium Channels. Mol Pharmacol 2001. [DOI: 10.1124/mol.59.6.1457] [Citation(s) in RCA: 33] [Impact Index Per Article: 1.4] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/22/2022] Open
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Kinoshita E, Maejima H, Yamaoka K, Konno K, Kawai N, Shimizu E, Yokote S, Nakayama H, Seyama I. Novel wasp toxin discriminates between neuronal and cardiac sodium channels. Mol Pharmacol 2001; 59:1457-63. [PMID: 11353806] [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: 04/16/2023] Open
Abstract
Pompilidotoxins (PMTXs), derived from the venom of solitary wasp has been known to facilitate synaptic transmission in the lobster neuromuscular junction, and a recent further study from rat trigeminal neurons revealed that the toxin slows Na+ channel inactivation without modifying activation process. Here we report that beta-PMTX modifies rat brain type II Na+ channel alpha-subunit (rBII) expressed in human embryonic kidney cells but fails to act on the rat heart alpha-subunit (rH1) at similar concentrations. We constructed a series of chimeric mutants of rBII and rH1 Na+ channels and compared modification of the steady-state Na+ currents by beta-PMTX. We found that a difference in a single amino acid between Glu-1616 in rBII and Gln-1615 in rH1 at the extracellular loop of D4S3-S4 is crucial for the action of beta-PMTX. PMTXs, which are small peptides with 13 amino acids, would be a potential tool for exploring a new functional moiety of Na+ channels.
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Affiliation(s)
- E Kinoshita
- Department of Physiology, School of Medicine, Hiroshima University, Kasumi 1-2-3, Hiroshima 734-8551, Japan
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Yoshimura O, Maejima H, Sasaki H, Tanaka S, Kanemura N, Shirahama K, Kato H, Kawamoto I, Miyamoto H, Yata K, Watanabe M, Moriyama H, Shinkoda K, Kobayashi R, Minematsu A, Takayanagi K. Bowel Dysfunction and Disturbance of Physical Condition after Evacuation in Patients with Chronic Cervical Spinal Cord Injuries. J Phys Ther Sci 2001. [DOI: 10.1589/jpts.13.145] [Citation(s) in RCA: 3] [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: 11/24/2022] Open
Affiliation(s)
- Osamu Yoshimura
- Institute of Health Sciences, Faculty of Medicine, Hiroshima University
| | - Hiroshi Maejima
- Institute of Health Sciences, Faculty of Medicine, Hiroshima University
| | - Hisato Sasaki
- Institute of Health Sciences, Faculty of Medicine, Hiroshima University
| | - Sachiko Tanaka
- Institute of Health Sciences, Faculty of Medicine, Hiroshima University
| | - Naohiko Kanemura
- Institute of Health Sciences, Faculty of Medicine, Hiroshima University
| | - Kunji Shirahama
- Institute of Health Sciences, Faculty of Medicine, Hiroshima University
| | - Hiroshi Kato
- Institute of Health Sciences, Faculty of Medicine, Hiroshima University
| | - Iwao Kawamoto
- Institute of Health Sciences, Faculty of Medicine, Hiroshima University
| | - Hidetaka Miyamoto
- Institute of Health Sciences, Faculty of Medicine, Hiroshima University
| | - Kaori Yata
- Institute of Health Sciences, Faculty of Medicine, Hiroshima University
| | - Makoto Watanabe
- Institute of Health Sciences, Faculty of Medicine, Hiroshima University
| | - Hideki Moriyama
- Institute of Health Sciences, Faculty of Medicine, Hiroshima University
| | - Kouichi Shinkoda
- Institute of Health Sciences, Faculty of Medicine, Hiroshima University
| | - Ryuji Kobayashi
- Institute of Health Sciences, Faculty of Medicine, Hiroshima University
| | - Akira Minematsu
- Institute of Health Sciences, Faculty of Medicine, Hiroshima University
| | - Kiyomi Takayanagi
- Department of Physical Therapy, School of Health Sciences, Sapporo Medical University
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Maejima H, Kamoda C, Ueda T, Sasaki H, Tanaka S, Kanemura N, Minematu A, Yoshimura O. The Effect of Adaptation and Expectation on Initial Stances Prior to Automatic Postural Responses. J Phys Ther Sci 2001. [DOI: 10.1589/jpts.13.93] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/24/2022] Open
Affiliation(s)
- Hiroshi Maejima
- Institute of Health Sciences, Hiroshima University School of Medicine
| | - Chie Kamoda
- Institute of Health Sciences, Hiroshima University School of Medicine
| | - Tatehito Ueda
- Institute of Health Sciences, Hiroshima University School of Medicine
| | - Hisato Sasaki
- Institute of Health Sciences, Hiroshima University School of Medicine
| | - Sachiko Tanaka
- Institute of Health Sciences, Hiroshima University School of Medicine
| | - Naohiko Kanemura
- Institute of Health Sciences, Hiroshima University School of Medicine
| | - Akira Minematu
- Institute of Health Sciences, Hiroshima University School of Medicine
| | - Osamu Yoshimura
- Institute of Health Sciences, Hiroshima University School of Medicine
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