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Ojima A, Matsui T, Nakamura N, Higashimoto Y, Ueda S, Fukami K, Okuda S, Yamagishi S. DNA aptamer raised against advanced glycation end products (AGEs) improves glycemic control and decreases adipocyte size in fructose-fed rats by suppressing AGE-RAGE axis. Horm Metab Res 2015; 47:253-8. [PMID: 25105541 DOI: 10.1055/s-0034-1385904] [Citation(s) in RCA: 8] [Impact Index Per Article: 0.9] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Indexed: 10/24/2022]
Abstract
Advanced glycation end products (AGEs) decrease adiponectin expression and suppress insulin signaling in cultured adipocytes through the interaction with a receptor for AGEs (RAGE) via oxidative stress generation. We have recently found that high-affinity DNA aptamer directed against AGE (AGE-aptamer) prevents the progression of experimental diabetic nephropathy by blocking the harmful actions of AGEs in the kidney. This study examined the effects of AGE-aptamer on adipocyte remodeling, AGE-RAGE-oxidative stress axis, and adiponectin expression in fructose-fed rats. Although AGE-aptamer treatment by an osmotic mini pump for 8 weeks did not affect serum insulin levels, it significantly decreased average fasting blood glucose and had a tendency to inhibit body weight gain in fructose-fed rats. Furthermore, AGE-aptamer significantly suppressed the increase in adipocyte size and prevented the elevation in AGEs, RAGE, and an oxidative stress marker, 8-hydroxydeoxyguanosine (8-OHdG), levels in adipose tissues of fructose-fed rats at 14-week-old, while it restored the decrease in adiponectin mRNA levels. Our present study suggests that AGE-aptamer could improve glycemic control and prevent adipocyte remodeling in fructose-fed rats partly by suppressing the AGE-RAGE-mediated oxidative stress generation. AGE-aptamer might be a novel therapeutic strategy for fructose-induced metabolic derangements.
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Kato K, Karube K, Nakamura N, Ito K. The effect of ring size on the mechanical relaxation dynamics of polyrotaxane gels. Polym Chem 2015. [DOI: 10.1039/c4py01644k] [Citation(s) in RCA: 17] [Impact Index Per Article: 1.9] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
Abstract
A simple molecular design based on the size of the cyclic components of polyrotaxanes achieved a significant variation of mechanical relaxation dynamics of polyrotaxane gels.
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Nakamura N, Kurota M, Watanabe T, Onodera Y, Suzuki H, Nakane M, Kawamae K. 0232. Evaluation of HFNC'S wash out effect; a comparison of open- and closed-mouth models. Intensive Care Med Exp 2014. [PMCID: PMC4796102 DOI: 10.1186/2197-425x-2-s1-p16] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/15/2022] Open
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79
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Shimomura K, Kanamoto T, Kita K, Akamine Y, Nakamura N, Mae T, Yoshikawa H, Nakata K. Cyclic compressive loading on 3D tissue of human synovial fibroblasts upregulates prostaglandin E2 via COX-2 production without IL-1β and TNF-α. Bone Joint Res 2014; 3:280-8. [PMID: 25237168 PMCID: PMC4178306 DOI: 10.1302/2046-3758.39.2000287] [Citation(s) in RCA: 22] [Impact Index Per Article: 2.2] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Indexed: 11/14/2022] Open
Abstract
Objective Excessive mechanical stress on synovial joints causes osteoarthritis
(OA) and results in the production of prostaglandin E2 (PGE2), a
key molecule in arthritis, by synovial fibroblasts. However, the
relationship between arthritis-related molecules and mechanical
stress is still unclear. The purpose of this study was to examine
the synovial fibroblast response to cyclic mechanical stress using
an in vitro osteoarthritis model. Method Human synovial fibroblasts were cultured on collagen scaffolds
to produce three-dimensional constructs. A cyclic compressive loading
of 40 kPa at 0.5 Hz was applied to the constructs, with or without
the administration of a cyclooxygenase-2 (COX-2) selective inhibitor
or dexamethasone, and then the concentrations of PGE2, interleukin-1β (IL-1β),
tumour necrosis factor-α (TNF-α), IL-6, IL-8 and COX-2 were measured. Results The concentrations of PGE2, IL-6 and IL-8 in the loaded samples
were significantly higher than those of unloaded samples; however,
the concentrations of IL-1β and TNF-α were the same as the unloaded
samples. After the administration of a COX-2 selective inhibitor,
the increased concentration of PGE2 by cyclic compressive loading
was impeded, but the concentrations of IL-6 and IL-8 remained high.
With dexamethasone, upregulation of PGE2, IL-6 and IL-8 was suppressed. Conclusion These results could be useful in revealing the molecular mechanism
of mechanical stress in vivo for a better understanding
of the pathology and therapy of OA. Cite this article: Bone Joint Res 2014;3:280–8.
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Nakamura N, Nozoe E, Okawachi T, Ishihata K, Shimomatsu K, Nishihara K, Matsumoto K. Three-dimensional Morphological Analysis of the Upper Lip Configuration during Facial Expressions. J Oral Maxillofac Surg 2014. [DOI: 10.1016/j.joms.2014.06.096] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
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81
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Nakamura N, Takahashi O, Ogita M, Kawamori J, Sekiguti K. Neuropathic Pain Features in Patients With Bone Metastases. Int J Radiat Oncol Biol Phys 2014. [DOI: 10.1016/j.ijrobp.2014.05.2032] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
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82
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Kibe T, Oyama K, Fuchigami T, Yoshimura T, Matsunaga K, Nishihara K, Taguchi T, Nakamura N. Examination of the process underlying healing of epithelial defects by using different wound dressings. J Oral Maxillofac Surg 2014. [DOI: 10.1016/j.joms.2014.06.359] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/24/2022]
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83
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Ohyagi Y, Nakamura N, Yanagihara Y, Iinuma K, Kira J. P2‐043: APOMORPHINE THERAPY FOR NEURONAL INSULIN RESISTANCE IN ALZHEIMER'S MICE. Alzheimers Dement 2014. [DOI: 10.1016/j.jalz.2014.05.716] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/24/2022]
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84
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Sanada Y, Asai S, Ikemoto A, Moriwaki T, Nakamura N, Miyaji M, Zhang-Akiyama QM. Oxidation resistance 1 is essential for protection against oxidative stress and participates in the regulation of aging in Caenorhabditis elegans. Free Radic Res 2014; 48:919-28. [PMID: 24865925 DOI: 10.3109/10715762.2014.927063] [Citation(s) in RCA: 30] [Impact Index Per Article: 3.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/13/2022]
Abstract
Human oxidation resistance 1 (OXR1) functions in protection against oxidative damage and its homologs are highly conserved in eukaryotes examined so far, but its function still remains uncertain. In this study, we identified a homolog (LMD-3) of human OXR1 in the nematode Caenorhabditis elegans (C. elegans). The expressed LMD-3 was able to suppress the mutator phenotypes of E. coli mutMmutY and mutT mutants. Purified LMD-3 did not have enzymatic activity against 8-oxoG, superoxide dismutase (SOD), or catalase activities. Interestingly, the expression of LMD-3 was able to suppress the methyl viologen or menadione sodium bisulfite-induced expression of soxS and sodA genes in E. coli. The sensitivity of the C. elegans lmd-3 mutant to oxidative and heat stress was markedly higher than that of the wild-type strain N2. These results suggest that LMD-3 protects cells against oxidative stress. Furthermore, we found that the lifespan of the C. elegans lmd-3 mutant was significantly reduced compared with that of the N2, which was resulted from the acceleration of aging. We further examined the effects of deletions in other oxidative defense genes on the properties of the lmd-3 mutant. The deletion of sod-2 and sod-3, which are mitochondrial SODs, extended the lifespan of the lmd-3 mutant. These results indicate that, in cooperation with mitochondrial SODs, LMD-3 contributes to the protection against oxidative stress and aging in C. elegans.
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Miyakubo K, Nakamura N. Temperature Dependence of 2H Nuclear Quadrupole Interaction in Very Short Hydrogen Bonds in Some Organic Acidic Salt Crystals. ACTA ACUST UNITED AC 2014. [DOI: 10.1515/zna-2002-6-709] [Citation(s) in RCA: 7] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/15/2022]
Abstract
The 2H nuclear quadrupole interaction parameters, e2Qq/h and η, are closely related to the shape of the potential energy surface at hydrogen bonds and depend sensitively on their geometry. We measured the temperature dependence of the 2H NMR spectra of the crystalline acidic salts KDCO3, KD cetylenedicarboxylate, RbD acetylenedicarboxylate, and KD maleate, which contain very short O-D···O type hydrogen bonds. The temperature coefficient decreases with increase in the O···O distance in the hydrogen bond. Ab inito molecular orbital calculations of the electric field gradient tensor based on the temperature dependent structure of each crystal indicate that thermal expansion of the hydrogen bond geometry is not responsible for this tendency. Ab initio calculations also predict that a fictitious off center shift of the hydrogen position in a symmetric hydrogen bond causes very high e2 Qq/h values. This suggests that low energy vibrational excitation may be responsible for large positive d (e2 Qq/h)/dT values in symmetric hydrogen bonds.
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Terajima M, Kaneko-Kobayashi Y, Mizuhara H, Ishikawa T, Imamura E, Hattori K, Nakamura N, Yuri M, Higashi Y, Seki N. THU0541 Anti-Inflammatory Activity of A Novel Small Molecule Inhibitor of Pikfvye, A Class III PI Kinase. Ann Rheum Dis 2014. [DOI: 10.1136/annrheumdis-2014-eular.1310] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/04/2022]
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Fukui M, Tanaka M, Toda H, Asano M, Yamazaki M, Hasegawa G, Nakamura N. Low serum potassium concentration is a predictor of chronic kidney disease. Int J Clin Pract 2014; 68:700-4. [PMID: 24905447 DOI: 10.1111/ijcp.12367] [Citation(s) in RCA: 7] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Indexed: 11/28/2022] Open
Abstract
AIMS The aim of this study was to examine whether low serum potassium concentration could be a predictor of chronic kidney disease (CKD) in a community-based cohort. MATERIALS AND METHODS We enrolled 1001 subjects, median period of 5.7 years, and evaluated the risk factors for CKD, defined as estimated glomerular filtration rate (eGFR) < 60 ml/min/1.73 m(2), and assessed whether low serum potassium concentration could predict CKD. RESULTS Compared with the subjects without development of CKD, age, body mass index, fasting plasma glucose, uric acid (UA), creatinine and serum sodium concentration were higher, and serum potassium concentration was lower in subjects with development of CKD. Univariate Cox regression analyses demonstrated that age, body mass index, fasting plasma glucose, UA, creatinine, serum sodium concentration and serum potassium concentration were associated with progression of CKD. Multiple Cox regression analysis revealed that age, gender, creatinine and serum potassium concentration were independent predictors of CKD after adjustment for covariates. When serum potassium concentration was below 4.0 mmol/l at baseline, hazard ratio (95% confidence interval) of developing CKD was 2.65 (2.04-3.44; p < 0.0001). CONCLUSIONS Serum potassium concentration could be a clinically relevant risk factor for the progression of CKD, defined as eGFR < 60 ml/min/1.73 m(2) , in healthy subjects.
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Yamasaki T, Horie S, Tanaka E, Nakamura N, Ohyagi Y, Kanba S, Kira JI, Tobimatsu S. P61: Higher level but not lower level parallel visual pathways are functionally altered in patients with mild cognitive impairment. Clin Neurophysiol 2014. [DOI: 10.1016/s1388-2457(14)50221-0] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/17/2022]
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89
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Sakai T, Koyanagi M, Nakae N, Kimura Y, Sanada Y, Nakamura N, Nakata K. EVALUATION OF A NEW QUADRICEPS STRENGTHENING EXERCISE FOR THE PREVENTION OF SECONDARY CARTILAGE INJURY IN PATIENTS WITH PCL INSUFFICIENCY: COMPARISON OF TIBIAL MOVEMENT IN PRONE AND SITTING POSITIONS DURING THE EXERCISE. Br J Sports Med 2014. [DOI: 10.1136/bjsports-2014-093494.257] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/03/2022]
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90
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Nakamura N, Katoh H, Teramoto Y. Mathematical approach for the dynamic testing technique. ACTA ACUST UNITED AC 2014. [DOI: 10.1007/bf02546895] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/24/2022]
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91
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Ochiai T, Shioya A, Honma H, Saitoh Y, Matsumura S, Ban D, Irie T, Kudo A, Nakamura N, Fujikawa T, Itai A, Tanaka S, Arii S, Yamaoka S, Tanabe M. Combination Treatment of IκB Kinase β Inhibitor IMD-0354 and Gemcitabine Suppresses Oncogenic Proliferation of Pancreatic Cancer Cells. J Surg Res 2014. [DOI: 10.1016/j.jss.2013.11.157] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/25/2022]
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92
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Nakamura N, Tsurumi H, Shibata Y, Mabuchi R, Kitagawa J, Suetsugu A, Kanemura N, Goto N, Hara T, Moriwaki H. Garenoxacin Prophylaxis for Febrile Neutropenia After Chemotherapy in Hematological Malignancies. Ann Oncol 2013. [DOI: 10.1093/annonc/mdt459.17] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/13/2022] Open
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93
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Nakamura N, Matsubara K, Sanoh S, Ohta S, Uramaru N, Kitamura S, Yamaguchi M, Sugihara K, Fujimoto N. Cell type-dependent agonist/antagonist activities of polybrominated diphenyl ethers. Toxicol Lett 2013; 223:192-7. [DOI: 10.1016/j.toxlet.2013.09.007] [Citation(s) in RCA: 11] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/20/2013] [Revised: 09/09/2013] [Accepted: 09/11/2013] [Indexed: 11/15/2022]
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94
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Nakamura N, Ito R, Takahashi O, Haga C, Shikama N, Akahane K, Ogita M, Mizuno N, Tamaki S, Sekiguchi K. Fatigue During Breast Radiation Therapy and its Predictive Factors. Int J Radiat Oncol Biol Phys 2013. [DOI: 10.1016/j.ijrobp.2013.06.529] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/25/2022]
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95
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Soejima N, Ohyagi Y, Nakamura N, Himeno E, M. Iinuma K, Sakae N, Yamasaki R, Tabira T, Murakami K, Irie K, Kinoshita N, M. LaFerla F, Kiyohara Y, Iwaki T, Kira JI. Intracellular Accumulation of Toxic Turn Amyloid-β is Associated with Endoplasmic Reticulum Stress in Alzheimer's Disease. Curr Alzheimer Res 2013. [DOI: 10.2174/156720513804871372] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/22/2022]
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96
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Soejima N, Ohyagi Y, Nakamura N, Himeno E, M. Iinuma K, Sakae N, Yamasaki R, Tabira T, Murakami K, Irie K, Kinoshita N, M. LaFerla F, Kiyohara Y, Iwaki T, Kira JI. Intracellular Accumulation of Toxic Turn Amyloid-β is Associated with Endoplasmic Reticulum Stress in Alzheimer’s Disease. Curr Alzheimer Res 2013. [DOI: 10.2174/1567205011310010003] [Citation(s) in RCA: 7] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/22/2022]
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97
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Soejima N, Ohyagi Y, Nakamura N, Himeno E, Iinuma KM, Sakae N, Yamasaki R, Tabira T, Murakami K, Irie K, Kinoshita N, LaFerla FM, Kiyohara Y, Iwaki T, Kira JI. Intracellular accumulation of toxic turn amyloid-β is associated with endoplasmic reticulum stress in Alzheimer's disease. Curr Alzheimer Res 2013; 10:11-20. [PMID: 22950910] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [MESH Headings] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/20/2012] [Revised: 08/02/2012] [Accepted: 08/13/2012] [Indexed: 06/01/2023]
Abstract
Amyloid-β protein (Aβ) accumulates in the neurons of Alzheimer's disease (AD) patients at an early stage of the disease. Recently, we found that Aβ with a toxic turn at positions 22 and 23 accumulates in neurons in AD brain. Here, we studied the accumulation of Aβ, toxic turn Aβ and high-molecular-weight Aβ oligomers in presenilin 1 (PS1) gene-transfected SH-SY5Y cells as well as in the brains of 3xTg-AD mice and AD patients. Immunostaining revealed that accumulation of toxic turn Aβ was promoted in G384A- and I143T-mutant PS1-transfected cells and further enhanced by co-transfection of cells with the Aβ-precursor protein (AβPP) gene. In contrast, accumulation of high-molecular-weight Aβ oligomers was promoted in mutant PS1 cells but attenuated by co-transfection of cells with the AβPP gene. Toxic turn Aβ was detected in the neurons of 3xTg-AD mice aged 2 months, when the mice were cognitively unimpaired. In contrast, high-molecular-weight Aβ oligomers were detected in the neurons of 7-month-old mice, when memory dysfunction is apparent. Furthermore, immunostaining and western blotting for Rab4, Rab6 and GRP78 revealed increased levels of these proteins in mutant PS1 cells and their accumulation in the neurons of 3xTg-AD mice. Remarkably, GRP78 immunoreactivity was increased at 2 months of age. Double-label immunostaining of AD brain revealed an apparent association between toxic turn Aβ and GRP78, an endoplasmic reticulum (ER) stress marker. Intraneuronal accumulation of toxic turn Aβ may be associated with ER stress in the brains of AD model mice and AD patients at an early stage.
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Kato T, Nakamura N, Masuda Y, Yoshida A, Morimoto T, Yamamura K, Yamashita S, Sato F. Phasic bursts of the antagonistic jaw muscles during REM sleep mimic a coordinated motor pattern during mastication. J Appl Physiol (1985) 2012. [PMID: 23195628 DOI: 10.1152/japplphysiol.00895.2012] [Citation(s) in RCA: 14] [Impact Index Per Article: 1.2] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/30/2023] Open
Abstract
Sleep-related movement disorders are characterized by the specific phenotypes of muscle activities and movements during sleep. However, the state-specific characteristics of muscle bursts and movement during sleep are poorly understood. In this study, jaw-closing and -opening muscle electromyographic (EMG) activities and jaw movements were quantified to characterize phenotypes of motor patterns during sleep in freely moving and head-restrained guinea pigs. During non-rapid eye movement (NREM) sleep, both muscles were irregularly activated in terms of duration, activity, and intervals. During rapid eye movement (REM) sleep, clusters of phasic bursts occurred in the two muscles. Compared with NREM sleep, burst duration, activity, and intervals were less variable during REM sleep for both muscles. Although burst activity was lower during the two sleep states than during chewing, burst duration and intervals during REM sleep were distributed within a similar range to those during chewing. A trigger-averaged analysis of muscle bursts revealed that the temporal association between the bursts of the jaw-closing and -opening muscles during REM sleep was analogous to the temporal association during natural chewing. The burst characteristics of the two muscles reflected irregular patterns of jaw movements during NREM sleep and repetitive alternating bilateral movements during REM sleep. The distinct patterns of jaw muscle bursts and movements reflect state-specific regulations of the jaw motor system during sleep states. Phasic activations in the antagonistic jaw muscles during REM sleep are regulated, at least in part, by the neural networks involving masticatory pattern generation, demonstrating that waking jaw motor patterns are replayed during sleep periods.
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Dan S, Isoyama S, Nishimura Y, Kajiwara G, Nakamura N, Yamori T. 370 Identification of IGF1R as a Predictive Biomarker for Intrinsic Resistance to PI3K Inhibitors and a Therapeutic Target for Improving the Drug Efficacy. Eur J Cancer 2012. [DOI: 10.1016/s0959-8049(12)72168-8] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/27/2022]
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100
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Isoyama S, Dan S, Nishimura Y, Kajiwara G, Nakamura N, Irimura T, Yamori T. 148 Establishment of PI3K Inhibitor-resistant Cancer Cell Lines and the Therapeutic Strategies for Overcoming the Acquired Resistance. Eur J Cancer 2012. [DOI: 10.1016/s0959-8049(12)71946-9] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/27/2022]
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