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  1. AU="Toru Nabika"
  2. AU="Vojkovic, Marina"
  3. AU="Gaier, Eric D"
  4. AU="Chandler Crews"
  5. AU="Comte, Marie-Hélène"
  6. AU="Cohen, Or"
  7. AU="Abdellatifi, Mohamed"
  8. AU="Luebbe, Elizabeth"
  9. AU="Emidio, Adriana"
  10. AU=Masmejan Sophie
  11. AU="Samantha Ridley"
  12. AU="Moghaddam-Alvandi, Arash"
  13. AU="Khanolkar, Amey R."
  14. AU="Vasquez Martinez, Rodolfo"
  15. AU="Morgan, E"

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  1. Artikel ; Online: Car Driving Status and Living Arrangement Associated with Sarcopenia among Rural Japanese Older Adults

    Tsuyoshi Hamano / Takafumi Abe / Ryo Miyazaki / Kenta Okuyama / Kristina Sundquist / Toru Nabika

    International Journal of Environmental Research and Public Health, Vol 19, Iss 414, p

    A Cross-Sectional Study

    2022  Band 414

    Abstract: Ensuring mobility after driving cessation is an important public health issue to prevent functional limitations, but this issue is still not fully understood in rural settings. The aim of this study was to test the hypothesis that being a non-driver and ... ...

    Abstract Ensuring mobility after driving cessation is an important public health issue to prevent functional limitations, but this issue is still not fully understood in rural settings. The aim of this study was to test the hypothesis that being a non-driver and living alone is associated with a greater risk of sarcopenia among the community-dwelling elderly in rural Japanese areas. This study was conducted in 2018 and data from 738 participants were used. Sarcopenia was assessed by measuring walking speed, handgrip strength, and skeletal muscle mass. Car driving status and living arrangement were collected using self-reported questionnaires and face-to-face interviews. Four groups were set to determine combined conditions of car driving status and living arrangement. Logistic regression analysis was performed to estimate the odds ratio (OR) and a 95% confidence interval of sarcopenia after adjustment for confounding factors. Compared with the reference group (driver and living with others), the OR of sarcopenia was significantly higher in the non-driver and living alone group (OR = 2.21; 95% confidence interval, 1.02–4.80). Our findings suggest that the consideration of both driving status and living arrangement are important in the formulation of public health strategies to prevent sarcopenia in rural Japanese areas.
    Schlagwörter rural area ; sarcopenia ; car driving status ; living arrangement ; older adults ; Medicine ; R
    Thema/Rubrik (Code) 380
    Sprache Englisch
    Erscheinungsdatum 2022-12-01T00:00:00Z
    Verlag MDPI AG
    Dokumenttyp Artikel ; Online
    Datenquelle BASE - Bielefeld Academic Search Engine (Lebenswissenschaftliche Auswahl)

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  2. Artikel ; Online: Neighborhood Environmental Factors and Physical Activity Status among Rural Older Adults in Japan

    Kenta Okuyama / Takafumi Abe / Xinjun Li / Yuta Toyama / Kristina Sundquist / Toru Nabika

    International Journal of Environmental Research and Public Health, Vol 18, Iss 1450, p

    2021  Band 1450

    Abstract: 1) Background: Although several neighborhood environmental factors have been identified to be associated with older adults’ physical activity, little research has been done in rural areas where the population is aging. This study aimed to investigate ... ...

    Abstract (1) Background: Although several neighborhood environmental factors have been identified to be associated with older adults’ physical activity, little research has been done in rural areas where the population is aging. This study aimed to investigate neighborhood environmental factors and the longitudinal change of physical activity status among rural older adults in Japan. (2) Methods: The study included 2211 older adults, aged over 60 years, residing in three municipalities in Shimane prefecture and participating at least twice in annual health checkups between 2010 and 2019. Physical activity was identified based on self-report. Hilliness, bus stop density, intersection density, residential density, and distance to a community center were calculated for each subject. Hazard ratios for the incidence of physical inactivity were estimated using Cox proportional hazards models. (3) Results: We found that 994 (45%) of the study subjects became physically inactive during the follow-up. Those living far from a community center had a lower risk of becoming physically inactive compared to those living close to a community center. When the analysis was stratified by residential municipality, this association remained in Ohnan town. Those living in hilly areas had a higher risk of becoming physically inactive in Okinoshima town. (4) Conclusions: The impact of neighborhood environmental factors on older adults’ physical activity status might differ by region possibly due to different terrain and local lifestyles.
    Schlagwörter community center ; hilliness ; neighborhood environment ; older adults ; physical activity ; Medicine ; R
    Thema/Rubrik (Code) 910
    Sprache Englisch
    Erscheinungsdatum 2021-02-01T00:00:00Z
    Verlag MDPI AG
    Dokumenttyp Artikel ; Online
    Datenquelle BASE - Bielefeld Academic Search Engine (Lebenswissenschaftliche Auswahl)

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  3. Artikel ; Online: Associations between physical frailty and living arrangements in Japanese older adults living in a rural remote island

    Ryo Miyazaki / Takafumi Abe / Shozo Yano / Kenta Okuyama / Naoki Sakane / Hitoshi Ando / Minoru Isomura / Masayuki Yamasaki / Toru Nabika

    Journal of General and Family Medicine, Vol 23, Iss 5, Pp 310-

    The Shimane CoHRE study

    2022  Band 318

    Abstract: Abstract Background Living arrangements have been known to be associated with physical frailty. However, the prevalence of frailty and its risk factors in remote islands is not understood. We examined the association between living arrangements and ... ...

    Abstract Abstract Background Living arrangements have been known to be associated with physical frailty. However, the prevalence of frailty and its risk factors in remote islands is not understood. We examined the association between living arrangements and objectively measured frailty among older adults living in a remote island of Japan. Methods Among older people living in Okinoshima, 656 older adults (75.6 ± 6.4 years) were analyzed. Physical frailty (robust, prefrailty, or frailty) was assessed using the 5‐item frailty phenotype (unintentional weight loss, self‐reported exhaustion, weakness, slow walking speed, and low physical activity). Physical functions (muscle mass, gait speed, and grip strength) were measured objectively. Results The prevalence of frailty and prefrailty was 6.6% and 43.8%, respectively. Living with a spouse resulted in a significantly lower prevalence of frailty (p < 0.001) compared with other living arrangements. All objectively measured physical functions among those who lived with a spouse were significantly superior to those who lived with family or alone (p < 0.001). Multinomial logistic regression showed that living alone was significantly associated with frailty (odds ratio [OR] 2.36, 95% confidence interval [CI] 1.07–5.24) and prefrailty (OR 1.75, 95% CI 1.14–2.69) after adjusting for all covariates. Conclusion The prevalence of frailty on remote islands seemed similar to that in urban areas. Older people living in remote islands might be able to maintain their physical health. Furthermore, living alone may correlate with increased risks of frailty and prefrailty. Among elderly individuals on remote islands, living with a spouse might be desirable to prevent (pre)frailty.
    Schlagwörter elderly ; gait speed ; Japan ; living alone ; marital status ; Medicine (General) ; R5-920
    Thema/Rubrik (Code) 120
    Sprache Englisch
    Erscheinungsdatum 2022-09-01T00:00:00Z
    Verlag Wiley
    Dokumenttyp Artikel ; Online
    Datenquelle BASE - Bielefeld Academic Search Engine (Lebenswissenschaftliche Auswahl)

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  4. Artikel ; Online: Hilly environment and physical activity among community-dwelling older adults in Japan

    Takafumi Abe / Kenta Okuyama / Tsuyoshi Hamano / Miwako Takeda / Minoru Isomura / Toru Nabika

    BMJ Open, Vol 10, Iss

    a cross-sectional study

    2020  Band 3

    Abstract: ObjectivesWe investigated whether a moderate-to-vigorous physical activity (MVPA) level and walking time were associated with a hilly environment in rural Japanese older adults.DesignCross-sectional study.SettingUnnan city, Ohnan and Okinoshima towns in ... ...

    Abstract ObjectivesWe investigated whether a moderate-to-vigorous physical activity (MVPA) level and walking time were associated with a hilly environment in rural Japanese older adults.DesignCross-sectional study.SettingUnnan city, Ohnan and Okinoshima towns in Shimane, Japan.ParticipantsData were collected from 1115 adults from the Shimane CoHRE study, who were aged 60 years and older and living in rural Japan in 2012.MeasuresWe measured the total time spent on MVPA and walking using a Japanese short version of the International Physical Activity Questionnaire. The land slope in 400 or 800 m network buffers was assessed using the geographic information system. A multivariable Poisson regression model examined the prevalence ratios (PR) and 95% CIs of walking time or MVPA levels meeting the WHO guideline (>150 min/week) in the land slope categories (low, middle and high), adjusted for confounders.ResultsEngaging in the recommended level of MVPA was significantly associated with middle land slope (PR=1.07; p=0.03) and high land slope (PR=1.06; p=0.07) compared with low land slope in the 400 m network buffer, as well as with middle land slope (PR=1.02; p=0.48) and high land slope (PR=1.04; p=0.25) compared with the low land slope in the 800 m network buffer. Walking time was significantly associated with middle land slope (PR=1.13; p=0.04) and high land slope (PR=1.17; p=0.01) compared with low land slope in the 400 m network buffer, and with middle land slope (PR=1.09; p=0.16) and high land slope (PR=1.17; p<0.01) compared with low land slope in the 800 m network buffer. The sensitivity analysis found only a positive association between walking time and land slope in the 400 and 800 m network buffers.ConclusionsThis study showed that a hilly environment was positively associated with walking time among older adults living in rural Japan.
    Schlagwörter Medicine ; R
    Thema/Rubrik (Code) 910
    Sprache Englisch
    Erscheinungsdatum 2020-03-01T00:00:00Z
    Verlag BMJ Publishing Group
    Dokumenttyp Artikel ; Online
    Datenquelle BASE - Bielefeld Academic Search Engine (Lebenswissenschaftliche Auswahl)

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  5. Artikel ; Online: NADPH Oxidase-Related Pathophysiology in Experimental Models of Stroke

    Hiroshi Yao / Tetsuro Ago / Takanari Kitazono / Toru Nabika

    International Journal of Molecular Sciences, Vol 18, Iss 10, p

    2017  Band 2123

    Abstract: Several experimental studies have indicated that nicotinamide adenine dinucleotide phosphate (NADPH) oxidases (Nox) exert detrimental effects on ischemic brain tissue; Nox-knockout mice generally exhibit resistance to damage due to experimental stroke ... ...

    Abstract Several experimental studies have indicated that nicotinamide adenine dinucleotide phosphate (NADPH) oxidases (Nox) exert detrimental effects on ischemic brain tissue; Nox-knockout mice generally exhibit resistance to damage due to experimental stroke following middle cerebral artery occlusion (MCAO). Furthermore, our previous MCAO study indicated that infarct size and blood-brain barrier breakdown are enhanced in mice with pericyte-specific overexpression of Nox4, relative to levels observed in controls. However, it remains unclear whether Nox affects the stroke outcome directly by increasing oxidative stress at the site of ischemia, or indirectly by modifying physiological variables such as blood pressure or cerebral blood flow (CBF). Because of technical problems in the measurement of physiological variables and CBF, it is often difficult to address this issue in mouse models due to their small body size; in our previous study, we examined the effects of Nox activity on focal ischemic injury in a novel congenic rat strain: stroke-prone spontaneously hypertensive rats with loss-of-function in Nox. In this review, we summarize the current literature regarding the role of Nox in focal ischemic injury and discuss critical issues that should be considered when investigating Nox-related pathophysiology in animal models of stroke.
    Schlagwörter stroke ; reactive oxygen species ; focal ischemia ; spontaneously hypertensive rats ; pericytes ; blood-brain barrier ; ischemic penumbra ; Biology (General) ; QH301-705.5 ; Chemistry ; QD1-999
    Sprache Englisch
    Erscheinungsdatum 2017-10-01T00:00:00Z
    Verlag MDPI AG
    Dokumenttyp Artikel ; Online
    Datenquelle BASE - Bielefeld Academic Search Engine (Lebenswissenschaftliche Auswahl)

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  6. Artikel ; Online: Excess salt increases infarct size produced by photothrombotic distal middle cerebral artery occlusion in spontaneously hypertensive rats.

    Hiroshi Yao / Toru Nabika

    PLoS ONE, Vol 9, Iss 5, p e

    2014  Band 97109

    Abstract: Cerebral circulation is known to be vulnerable to high salt loading. However, no study has investigated the effects of excess salt on focal ischemic brain injury. After 14 days of salt loading (0.9% saline) or water, spontaneously hypertensive rats (SHR) ...

    Abstract Cerebral circulation is known to be vulnerable to high salt loading. However, no study has investigated the effects of excess salt on focal ischemic brain injury. After 14 days of salt loading (0.9% saline) or water, spontaneously hypertensive rats (SHR) and normotensive Wistar-Kyoto rats (WKY) were subjected to photothrombotic middle cerebral artery occlusion (MCAO), and infarct volume was determined at 48 h after MCAO: albumin and hemoglobin contents in discrete brain regions were also determined in SHR. Salt loading did not affect blood pressure levels in SHR and WKY. After MCAO, regional cerebral blood flow (CBF), determined with two ways of laser-Doppler flowmetry (one-point measurement or manual scanning), was more steeply decreased in the salt-loaded group than in the control group. In SHR/Izm, infarct volume in the salt-loaded group was 112±27 mm3, which was significantly larger than 77±12 mm3 in the control group (p = 0.002), while the extents of blood-brain barrier disruption (brain albumin and hemoglobin levels) were not affected by excess salt. In WKY, salt loading did not significantly increase infarct size. These results show the detrimental effects of salt loading on intra-ischemic CBF and subsequent brain infarction produced by phototrhombotic MCAO in hypertensive rats.
    Schlagwörter Medicine ; R ; Science ; Q
    Sprache Englisch
    Erscheinungsdatum 2014-01-01T00:00:00Z
    Verlag Public Library of Science (PLoS)
    Dokumenttyp Artikel ; Online
    Datenquelle BASE - Bielefeld Academic Search Engine (Lebenswissenschaftliche Auswahl)

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  7. Artikel: A nonsense mutation of Stim1 identified in stroke-prone spontaneously hypertensive rats decreased the store-operated calcium entry in astrocytes

    Ohara, Hiroki / Toru Nabika

    Biochemical and biophysical research communications. 2016,

    2016  

    Abstract: We previously identified a nonsense mutation in the stromal interaction molecule-1 (Stim1) resulting in expression of a truncated STIM1 in the stroke-prone spontaneously hypertensive rat (SHRSP). In this study, we evaluated activity of the store-operated ...

    Abstract We previously identified a nonsense mutation in the stromal interaction molecule-1 (Stim1) resulting in expression of a truncated STIM1 in the stroke-prone spontaneously hypertensive rat (SHRSP). In this study, we evaluated activity of the store-operated Ca2+-entry (SOCE) regulated by STIM1 to clarify putative functional abnormalities of the truncated STIM1. As a result, reduced SOCE activity resulting in suppression of cyclooxygenase-2 expression induced by SOCE was found in cultured astrocytes with the truncated STIM1 when compared with those with the wild-type. Our results indicated that the truncated STIM1 impaired Ca2+ signaling regulated by SOCE and that the impaired SOCE activity might be responsible for pathological phenotypes in SHRSP.
    Schlagwörter animal disease models ; astrocytes ; calcium ; hypertension ; nonsense mutation ; phenotype ; prostaglandin synthase ; rats ; Stromal interaction molecule-1 ; Stroke-prone spontaneously hypertensive rat ; Store-operated Ca2+-entry
    Sprache Englisch
    Umfang p. .
    Erscheinungsort Elsevier Inc.
    Dokumenttyp Artikel
    Anmerkung Pre-press version
    ZDB-ID 205723-2
    ISSN 0006-291X ; 0006-291X
    ISSN (online) 0006-291X
    ISSN 0006-291X
    DOI 10.1016/j.bbrc.2016.05.134
    Datenquelle NAL Katalog (AGRICOLA)

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  8. Artikel ; Online: Relationship Between Oral Health Status and Bone Mineral Density in Community-Dwelling Elderly Individuals

    Mayu Takeda / Yuhei Matsuda / Kumi Ikebuchi / Miwako Takeda / Takafumi Abe / Kazumichi Tominaga / Minoru Isomura / Toru Nabika / Takahiro Kanno

    Healthcare, Vol 9, Iss 432, p

    A Cross-Sectional Study

    2021  Band 432

    Abstract: The relationship between oral health status and bone mineral density has been poorly elucidated. We conducted a cross-sectional study to examine the relationship between oral health status and bone mineral density with data from healthy community- ... ...

    Abstract The relationship between oral health status and bone mineral density has been poorly elucidated. We conducted a cross-sectional study to examine the relationship between oral health status and bone mineral density with data from healthy community-dwelling elderly individuals in Ohnan-cho, Shimane Japan who were recruited in 2019 for the Shimane Center for Community-Based Health Research and Education (CoHRE) study. The study included 702 participants (306 men and 396 women). The median age, bone mineral density, and number of remaining teeth were 69.0 years, 86.2%, and 26.0, respectively. The two groups (Low teeth group and High teeth group) showed significant differences in age, hemoglobin A1c (HbA1c) level, and masticatory function in men ( p < 0.05). In women, age, number of untreated teeth, and masticatory function were significantly different ( p < 0.05). The odds ratio of propensity score analysis for the association between the number of remaining teeth and bone mineral density was 27.7 (95% confidence interval: 1.86–414.9, p < 0.05). The number of remaining teeth could be associated with bone mineral density in the healthy elderly women, and no significant association was observed in men. Number of remaining teeth and bone mineral density may be interrelated, and oral care by dentists/dental hygienists may play an important role in maintaining bone mineral density in elderly women.
    Schlagwörter number of remaining teeth ; bone mineral density ; community-dwelling elderly ; cross-sectional study ; propensity score analysis ; Medicine ; R
    Thema/Rubrik (Code) 360
    Sprache Englisch
    Erscheinungsdatum 2021-04-01T00:00:00Z
    Verlag MDPI AG
    Dokumenttyp Artikel ; Online
    Datenquelle BASE - Bielefeld Academic Search Engine (Lebenswissenschaftliche Auswahl)

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  9. Artikel ; Online: Environmental Factors Affecting Cognitive Function among Community-Dwelling Older Adults

    Atsushi Motohiro / Takafumi Abe / Kenta Okuyama / Keiichi Onoda / Tomoko Ito / Minoru Isomura / Toru Nabika / Shunichi Kumakura

    International Journal of Environmental Research and Public Health, Vol 18, Iss 8528, p

    A Longitudinal Study

    2021  Band 8528

    Abstract: Although neighborhood environmental factors have been found to be associated with cognitive decline, few longitudinal studies have focused on their effect on older adults living in rural areas. This longitudinal study aimed to investigate the role of ... ...

    Abstract Although neighborhood environmental factors have been found to be associated with cognitive decline, few longitudinal studies have focused on their effect on older adults living in rural areas. This longitudinal study aimed to investigate the role of neighborhood environmental factors in cognitive decline among rural older adults. The data of 485 older adults aged ≥60 years who were living in Unnan City in Japan and had participated in two surveys conducted between 2014 and 2018 were analyzed. Cognitive function was assessed using the Cognitive Assessment for Dementia, iPad version 2. Elevation, hilliness, residential density, and proximity to a community center were determined using geographic information system. We applied a generalized estimating equation with odds ratios (OR) and 95% confidence intervals (CIs) of cognitive decline in the quartiles of neighborhood environmental factors. A total of 56 (11.6%) participants demonstrated a decrease in cognitive function at follow up. Elevation (adjusted OR 2.58, 95% CI (1.39, 4.77) for Q4 vs. Q1) and hilliness (adjusted OR 1.93, 95% CI (1.03, 3.63) for Q4 vs. Q1) were associated with a higher likelihood of cognitive decline. The second quartiles of residential density showed significantly lower likelihoods of cognitive decline compared with the first quartiles (adjusted OR 0.36, 95% CI (0.19, 0.71) for Q2 vs. Q1). Thus, an elevated hilly environment and residential density predicted cognitive decline among rural older adults.
    Schlagwörter cognitive function ; rural mountainous area ; older adults ; Medicine ; R
    Thema/Rubrik (Code) 120
    Sprache Englisch
    Erscheinungsdatum 2021-08-01T00:00:00Z
    Verlag MDPI AG
    Dokumenttyp Artikel ; Online
    Datenquelle BASE - Bielefeld Academic Search Engine (Lebenswissenschaftliche Auswahl)

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  10. Artikel ; Online: Integrative genomic analysis of blood pressure and related phenotypes in rats

    Fumihiko Takeuchi / Yi-Qiang Liang / Masato Isono / Michiko Tajima / Zong Hu Cui / Yoko Iizuka / Takanari Gotoda / Toru Nabika / Norihiro Kato

    Disease Models & Mechanisms, Vol 14, Iss

    2021  Band 5

    Abstract: Despite remarkable progress made in human genome-wide association studies, there remains a substantial gap between statistical evidence for genetic associations and functional comprehension of the underlying mechanisms governing these associations. As a ... ...

    Abstract Despite remarkable progress made in human genome-wide association studies, there remains a substantial gap between statistical evidence for genetic associations and functional comprehension of the underlying mechanisms governing these associations. As a means of bridging this gap, we performed genomic analysis of blood pressure (BP) and related phenotypes in spontaneously hypertensive rats (SHR) and their substrain, stroke-prone SHR (SHRSP), both of which are unique genetic models of severe hypertension and cardiovascular complications. By integrating whole-genome sequencing, transcriptome profiling, genome-wide linkage scans (maximum n=1415), fine congenic mapping (maximum n=8704), pharmacological intervention and comparative analysis with transcriptome-wide association study (TWAS) datasets, we searched causal genes and causal pathways for the tested traits. The overall results validated the polygenic architecture of elevated BP compared with a non-hypertensive control strain, Wistar Kyoto rats (WKY); e.g. inter-strain BP differences between SHRSP and WKY could be largely explained by an aggregate of BP changes in seven SHRSP-derived consomic strains. We identified 26 potential target genes, including rat homologs of human TWAS loci, for the tested traits. In this study, we re-discovered 18 genes that had previously been determined to contribute to hypertension or cardiovascular phenotypes. Notably, five of these genes belong to the kallikrein–kinin/renin–angiotensin systems (KKS/RAS), in which the most prominent differential expression between hypertensive and non-hypertensive alleles could be detected in rat Klk1 paralogs. In combination with a pharmacological intervention, we provide in vivo experimental evidence supporting the presence of key disease pathways, such as KKS/RAS, in a rat polygenic hypertension model.
    Schlagwörter gene ; locus ; transcriptome ; blood pressure ; multifactorial disease ; genome-wide association studies ; Medicine ; R ; Pathology ; RB1-214
    Thema/Rubrik (Code) 610
    Sprache Englisch
    Erscheinungsdatum 2021-05-01T00:00:00Z
    Verlag The Company of Biologists
    Dokumenttyp Artikel ; Online
    Datenquelle BASE - Bielefeld Academic Search Engine (Lebenswissenschaftliche Auswahl)

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