Control system for the new RIKEN 28-GHz superconducting electron cyclotron resonance ion source for SRILAC

A new RIKEN 28-GHz superconducting electron cyclotron resonance ion source (SC-ECRIS) has been installed for the superconducting RIKEN linear accelerator (SRILAC). The new SC-ECRIS control system mainly consists of programmable logic controllers (PLCs) embedded with the Experimental Physics and Industrial Control System. To improve the reliability as compared with previous control systems, two types of PLC central processing units, sequential and Linux, have been installed in the same unit. Past experience has shown that new types of designs that can rapidly respond to system scalability are key. By connecting PLC stations using star-topology field buses, their rapid and cost-effective response to system changes is realized for the new devices. Furthermore, a unique data acquisition system employing a 920-MHz-band radio was developed to measure analog data such as the temperature at the high-voltage stage.

High intensity vanadium beam for synthesis of new superheavy elements with well-controlled emittance by using "slit triplet"

To provide a very powerful vanadium (V) beam with an intensity of at least 6 particle μA for synthesizing a new superheavy element (SHE) with atomic number Z = 119, we have developed a high-temperature oven (HTO) system to evaporate the metallic V powder inside the new superconducting (SC) electron cyclotron ion source. We successfully extracted a V¹³⁺ beam with a maximum beam intensity of 600 eμA with 2.8-kW microwave power and 900-W heating power of the HTO. Furthermore, from a systematic study of the dependence of the beam intensity on the microwave power and the HTO power, we successfully produced a V¹³⁺ beam of 300 eμA at a consumption rate of 3 mg/h, allowing a one-month duration continuous beam to carry out the SHE synthesis. In addition, to avoid serious damage to newly introduced SC acceleration cavities by beam losses, the beam should be transported with a well-controlled emittance. To efficiently limit the beam emittance, we employed a slit triplet consisting of three pairs of slits installed around the focus point of the low-energy beam transport. The first result of the emittance reduction was observed by a pepper-pot type emittance meter as a function of the acceptance of the slit triplet.

High-Fructose Diet-Induced Hypertriglyceridemia Is Associated With Enhanced Hepatic Expression of ACAT2 in Rats

High levels of fructose induce hypertriglyceridemia, characterized by excessive levels of triglyceride-rich lipoproteins such as very low-density lipoprotein (VLDL); however, the underlying mechanisms are poorly understood. The aim of this short communication was to examine hepatic changes in the expression of genes related to cholesterol metabolism in rats with hypertriglyceridemia induced by high-fructose or high-glucose diets. Rats were fed a 65 % (w/w) glucose diet or a 65 % (w/w) fructose diet for 12 days. Serum levels of triglycerides, total cholesterol, and VLDL+LDL-cholesterol, hepatic levels of triglycerides and cholesterol, and ACAT2 expression at the gene and protein levels were significantly higher in the fructose diet group compared to the glucose diet group. The hepatic levels of Abcg5/8 were lower in the fructose group than in the glucose group. Serum high-density lipoprotein (HDL)-cholesterol and hepatic expression levels of Hmgcr, Ldlr, Acat1, Mttp, Apob, and Cyp7a1 did not differ significantly between groups. These findings suggest that high-fructose diet-induced hypertriglyceridemia is associated with increased hepatic ACAT2 expression.

Age group differences in association between IADL decline and depressive symptoms in community-dwelling elderly

Background

Instrumental Activities of Daily Living (IADL) is an indicator of whether a community-dwelling elderly can live independently. IADL decline was reported to be associated with aging and depression. The present study aimed to investigate whether the association between IADL decline and depressive symptoms differs with aging, using two age groups of community-dwelling Japanese elderly in their 70s and 80s.

Methods

We conducted longitudinal analysis among participants in their 70s and 80s at the baseline from Septuagenarians, Octogenarians, Nonagenarians Investigation with Centenarians (SONIC) study. IADL was assessed by The Tokyo Metropolitan Institute of Gerontology (TMIG) index of competence. As a main predictor, depressive symptoms were measured by the five-item version of the Geriatrics Depression Scale (GDS-5). As possible confounders, we considered cognitive function, body mass index, solitary living, education, economic status, medical history of stroke and heart disease, hypertension, dyslipidemia, diabetes, and sex. We obtained odds ratios (ORs) of IADL decline for having depressive symptoms in each age group (70s/80s) and tested interactions between depressive symptoms and age groups in relation to IADL decline in 3 years by logistic regression. Additionally, to confirm age group differences, we conducted multiple group analysis.

Results

There were 559 participants in their 70s and 519 in their 80s. Compared to participants without depressive symptoms, those with depressive symptoms had higher OR of IADL decline in 70s (OR [95% CI] = 2.33 [1.13, 4.78]), but not in 80s (OR [95% CI] = 0.85 [0.46, 1.53]). There were significant interactions between depressive symptoms and age groups in relation to IADL decline (p-value = 0.03). Multiple group analyses showed differences between the age groups by Akaike information criterion (AIC), and ORs (95%CI) decline for depressive symptoms was 2.33 (1.14, 4.77) in 70s and 0.85 (0.47, 1.54) in 80s.

Conclusion

The association of depressive symptoms and IADL decline during the 3 years was significantly different between the 70s and 80s age groups, and significant association was found only in people in their 70s. Detecting depressive symptoms may be a key for preventing IADL decline in people in their 70s and not for those in their 80s.

SUCCESSFUL AGING AND HEALTHCARE SERVICE UTILIZATION IN EAST ASIA: NATIONAL COMPARISONS OF CHINA, KOREA, AND JAPAN

As the older population increases and lives longer, the demand for healthcare has been increased dramatically. To date, it is unknown whether older people’s healthcare utilization varies between countries and how it relates to successful aging. Using Rowe and Kahn’s model, we examine cross-national differences in the relationship between successful aging and healthcare service utilization in East Asia. Harmonized datasets at baseline from China Health and Retirement Longitudinal Study (CHARLS), Korean Longitudinal Study (KLoSA), and Japanese Study on Aging and Retirement (JSTAR) were used. Including 7,651 participants (aged 65-75 years), successful agers were identified using Rowe and Kahn’s criteria (i.e., no disease, no disability, high cognitive function, and active engagement). Healthcare service utilization includes hospital visit, number of hospital stay, number of nights per hospital stay, regular medical center visit, number of medical center visits, and possession of private insurance in previous year. Generalized linear models showed that successful agers’ healthcare service utilization is significantly different from non-successful agers (e.g., OR=2.19, p<.001 for regular medical center visits), and Korean and Chinese healthcare service utilization is different from Japanese (e.g., OR=0.44 and OR=10.18 for Chinese and Korean number of medical center regular visits, respectively, p<.001). Furthermore, the number of nights in hospital among Chinese and Korean successful agers tend to be greater than that of Japanese successful agers (OR=2.93 and OR=1.99 for Chinese and Korean successful agers, respectively, p<.001). This study indicates cross-national variations in pattern of healthcare service utilization between successful and non-successful agers in East Asia.

The impact of leisure activities on older adults' cognitive function, physical function, and mental health

Engagement in leisure activities has been claimed to be highly beneficial in the elderly. Practicing such activities is supposed to help older adults to preserve cognitive function, physical function, and mental health, and thus to contribute to successful aging. We used structural equation modeling (SEM) to analyze the impact of leisure activities on these constructs in a large sample of Japanese older adults (N = 809; age range 72–74). The model exhibited an excellent fit (CFI = 1); engaging in leisure activities was positively associated with all the three successful aging indicators. These findings corroborate previous research carried out in Western countries and extend its validity to the population of Eastern older adults. Albeit correlational in nature, these results suggest that active engagement in leisure activities can help older adults to maintain cognitive, physical, and mental health. Future research will clarify whether there is a causal relationship between engagement in leisure activities and successful aging.

COHORT DIFFERENCES IN CHANGES IN LIFE SATISFACTION AMONG OLDER JAPANESE

Life span research has been interested in how sociocultural contexts shape individual development and aging processes. Empirical studies have reported that later cohorts show higher levels of well-being. However, more recent studies indicate that cohort differences are not sustained in very late life. The present study examined whether cohort differences in well-being, as measured by life satisfaction, are observed in the young-old and old-old, and further explored potential determinants of cohort differences. Using longitudinal data from a nationally representative study of older Japanese, conducted from 1987—2002, we compared earlier- and later-born cohorts in the young-old (N = 874; age 60—65; year of birth: 1922—1927 and 1931—1936) and old-old (N = 1,022; age 70—80; year of birth: 1907—1917 and 1919—1929), respectively. To control for covariates, we used case-matched groups based on age and gender. Results revealed that later cohorts exhibited higher levels of life satisfaction in both age groups. In the young-old, life satisfaction declined across cohorts. In the old-old, life satisfaction remained stable among earlier cohorts but declined among later cohorts. Socioeconomic, social, and health factors at the individual level and methodological factors (i.e., number of observations) did not fully explain the cohort differences in both age groups. Our results suggest that historical increases in levels of well-being are observed in late life, but that these improvements do not hold in very late life. Future studies should consider potential societal factors behind observed cohort differences in well-being.

CHANGES IN DEPRESSIVE SYMPTOMS IN EAST ASIA: A COORDINATED ANALYSIS OF THREE LONGITUDINAL STUDIES

Evidence for changes in depressive symptoms is relatively sparse in Asian populations. We examined changes in depressive symptoms in China, Korea, and Japan. Data were derived from three longitudinal studies with three measurement waves: the China Health and Retirement Longitudinal Study (CHARLS between 2011—2015), the Korean Longitudinal Study of Aging (KLoSA between 2006—2010), and the Japanese Study of Aging and Retirement (JSTAR between 2007—2011). Participants aged 50—75 years were included in the analysis (CHARLS: n = 10,385; KLoSA: n = 6,683; JSTAR: n = 3,004). Multilevel analyses were conducted separately for each country to examine trajectories of depressive symptoms, controlling for age, age squared, gender, education, marital status, activities of daily living, and morbidity as covariates. Depressive symptoms were measured by the 10-item CES—D. The CES—D score was scaled to a T score metric (M = 50, SD =10) using the score at wave 1 in each country as a reference. Trends in depressive symptoms varied across countries, with stability in China but increase in Korea and Japan (Estimate = —0.05, 0.69, 0.40, respectively). Older Koreans reported higher levels of depressive symptoms than younger adults, whereas a reverse pattern was shown in China. Age differences were not found in Japan. Higher levels of education were associated with lower levels of depressive symptoms in China and Korea, whereas the opposite association emerged in Japan. These country differences will be discussed through the lens of societal and economic factors (e.g., welfare systems and economic recession).

RETIREMENT ADJUSTMENT: COMPARISON AMONG CHINESE, JAPANESE, AND KOREAN RETIREES

Moving into retirement is a stressful life event. However, recent research findings suggest that not every retiree experiences maladjustment. This paper investigated longitudinal changes in depressive symptoms during the retirement transition utilizing harmonized data of CHARLS, JSTAR, and KLoSA. Participants were selected for examination if meeting the following criteria: They were working in Wave 1 and had retired in Wave 2 (China=1053; Japan=184; Korea=706). These participants were categorized into two subgroups based on their status in Wave 3, either remained retired or reemployed. The proportion of retirees who were reemployed in Wave 3 is significantly higher in Korea (49.3%) and China (41.1%) than in Japan (17.4%). In each wave, the level of depressive symptoms was measured by the 10-item CES-D scale. Results of the repeated measures analyses show that, even after controlling for gender, mean level of depression increased over time among Korean retirees [F(2,702)=3.65,p=.026,η2=.010], whereas Japanese retirees’ depressive symptoms only increased in Wave 2 (Mean Difference =.83,SE=.39,p=.034) but not in Wave 3. Among Chinese, depressive symptoms did not significantly worsen after retirement, but the changes varied between retired persons and those who were reemployed in Wave 3 [F(1,1030)=4.25, p=.040, η2=.004]. Specifically, individuals who were reemployed after retirement experienced a reduction in depressive symptoms between Wave 1 and 3, whereas a reverse pattern is shown among retirees. This suggests that reemployment is beneficial to the well-being of Chinese retirees. The effects of socioeconomic factors (e.g., private and public health insurance and pension support) on depressive symptoms will be discussed.

Occlusal force predicted cognitive decline among 70- and 80-year-old Japanese: A 3-year prospective cohort study

PURPOSE

Dementia is a growing health problem for countries with aging populations, but few effective dementia treatments are available. However, there is increasing interest in oral health as a modifiable risk factor in interventions to prevent cognitive decline. This study aimed to investigate the impact of oral health on the decline of cognitive function over 3 years among Japanese people aged 70 and 80 years.

METHODS

Participants (n = 860) were community-dwelling older adults who participated in baseline and follow-up surveys (at baseline: 69-71 years n = 423; 79-81 years, n = 437). Registered dentists examined the number of teeth, number of functional teeth, number of periodontal teeth, and occlusal force. The Japanese version of the Montreal Cognitive Assessment was used to evaluate cognitive function. We also evaluated socioeconomic factors, medical history, drinking and smoking habits, physical performance, genetic factors, and C-reactive protein concentration in blood. A generalized estimating equation (GEE) was used to examine how oral health at baseline influenced cognitive decline over 3 years.

RESULTS

The GEE showed that the number of teeth (non-standardized coefficient: B = 0.031, p = 0.022) and occlusal force (B = 0.103, p = 0.004) at baseline were associated with cognitive function at follow-up, even after adjusting for other risk factors. Furthermore, maintaining more teeth (B = 0.009, p = 0.004) and a stronger occlusal force (B = 0.020, p = 0.040) buffered cognitive decline.

CONCLUSIONS

Number of teeth and occlusal force predict cognitive decline over 3 subsequent years in Japanese older adults aged 70 and 80 years.

P4500Cellular senescence of endothelial cells impairs angiogenesis by altering energy metabolism through p53-tigar axis

Background

Ischemic disease is prevalent in elderly population due to impaired angiogenesis. Endothelial cell (EC) generates energy largely via glycolysis, which is further activated when angiogenesis actively occurs. PFK-1 is one of the most important regulatory enzymes for glycolysis, which is activated by PFKFB3. On the other hand, TIGAR inhibits PFK-1 under the control of p53. Crucial roles of PFKFB3 in EC functions under physiological and pathological conditions have been reported; however, a role of TIGAR in EC angiogenic functions remains to be elucidated. Furthermore, it remains unknown whether and how cellular senescence affect the energy metabolism in EC.

Purpose

The purpose of this study is to investigate molecular mechanisms underlying EC dysfunction associated with ageing, especially by focusing on endothelial energy metabolism.

Method and result

Senescent EC showed reduced glucose consumption assessed by [U-13C]-glucose tracer assay in association with increased expression of p53 and TIGAR. Angiogenic capacity assessed by tube-formation assay was reduced in senescent EC. Of note, either silencing of TIGAR by siRNA or lentivirus-mediated overexpression of PFKFB3 improved angiogenic capacity in senescent EC. These results collectively suggest that senescence impairs glycolysis in EC by activating p53-TIGAR axis, which leads to senescence-associated endothelial dysfunction. To analyze an impact of EC senescence in angiogenesis in vivo, we generated EC-specific progeroid mice in which dominant negative form of telomere repeat-binding factor 2 (TRF2) was overexpressed in EC under the control of the TIE2 promoter. After confirming EC-specific senescence in these endothelial progeroid mice, we generated hind-limb ischemia model. Recovery of blood flow assessed by laser doppler velocimeter was significantly impaired in endothelial progeroid mice, indicating that EC senescence is directly and causally implicated in age-related angiogenic dysfunction. Of note, genetic inactivation of TIGAR completely rescued the impaired ischemia-induced neovessel formation in EC-specific progeroid mice.

Conclusion

Using unique endothelial progeroid mice, we revealed that EC senescence is a bona fide risk for ischemic disease, largely by reducing glycolysis in EC through p53-TIGAR axis. Our data suggest that endothelial energy metabolism is an attracting therapeutic target for the prevention and/or treatment of ischemic diseases, especially in elderly population.

P1535Clinical impact of carotid plaque score rather than carotid intima-media thickness on atherosclerotic cardiovascular disease

Background

Carotid intima-media thickness (cIMT) assessed by ultrasound has been widely accepted as a surrogate marker of atherosclerotic cardiovascular disease. On the other hand, carotid plaque score (cPS) reflecting throughout the carotid artery plaque burden may be better marker.

Methods

We retrospectively examined 2,035 patients who underwent carotid ultrasonography between January 2006 and December 2015 at our University Hospital. Median follow-up period was 4 years. We used Cox models that adjusted for established risk factors of ASCVD, including age, gender, hypertension, diabetes, smoking, and serum lipids to assess the association of cIMT as well as cPS with major adverse cardiac events (MACE). MACE was defined as all-cause mortality or rehospitalization for a cardiovascular-related illness

Results

During follow-up, 243 participants experienced MACE. After adjustment for established risk factors, cPS was associated with MACE (hazard ratio [HR] = 3.38 for top quintile vs. bottom quintile of cPS; 95% confidence interval [CI] 1.82 to 6.27; P-trend = 1.4×10–8), while cIMT was not (HR = 0.88, P=0.57). Addition of the cPS to established risk factors significantly improved risk discrimination (C-index 0.726 vs. 0.746; P=0.017)

Conclusion

As a marker, cPS, rather than cIMT can identify 20% of individuals who are at more than three-fold increased risk for MACE. Targeting diagnostic or therapeutic interventions to this subset may prove clinically useful.

Serum albumin/globulin ratio is associated with cognitive function in community-dwelling older people: The Septuagenarians, Octogenarians, Nonagenarians Investigation with Centenarians study

AIM

The objective of this study was to clarify the relationship between cognitive function and the serum albumin/globulin ratio (A/G ratio) in community-dwelling Japanese older adults.

METHODS

Randomly extracted residents in both urban and rural parts of Japan were enrolled in this study. A total of 1827 participants with a mean age of 70 or 80 years were recruited. A venue survey method was carried out with comprehensive studies, including interviews, blood collection, physical examination and cognitive function tests.

RESULTS

Univariate analysis showed a significant positive correlation between the total Japanese version of the Montreal Cognitive Assessment score and the serum A/G ratio at the age of 70 and 80 years, in which better cognitive function was associated with a high serum A/G ratio. Multiple regression analysis with the total Japanese version of the Montreal Cognitive Assessment score as the dependent variable showed that the serum albumin level, serum globulin level, serum A/G ratio, C-reactive protein, years of formal education and sex were related to the Japanese version of the Montreal Cognitive Assessment total score at the age of 70 years, and that the serum albumin level, serum globulin level, serum A/G ratio, C-reactive protein, years of formal education and stroke were related at the age of 80 years. The serum A/G ratio showed a better correlation than the serum globulin levels at the age of 70 and 80 years (70 years: β = 0.131 vs -0.111, 80 years: β = 0.108 vs -0.071).

CONCLUSIONS

We found a correlation between cognitive function and the serum A/G ratio in community-dwelling older people, suggesting that nutritional status and chronic inflammation might influence cognitive function. Geriatr Gerontol Int 2019; 19: 967-971.

Development of canine X-chromosome inactivation pattern analysis for the detection of cell clonality by incorporating the examination of the SLIT and NTRK-like family member 4 (SLITRK4) gene

X-chromosome inactivation pattern (XCIP) analysis can be used to assess the clonality of cell populations of various origin by distinguishing the methylated X chromosome from the unmethylated X chromosome. In this study, the utility of XCIP analysis was improved by incorporating the examination of AC dinucleotide repeats in SLIT and NTRK-like family member 4 (SLITRK4) gene into the previously reported CAG repeat examination of androgen receptor (AR) gene in dogs. The rate of heterozygosity when both genes were analysed (125/150, 83.3%) was higher than AR gene examination alone (86/150, 57.3%). Blood samples from heterozygous dogs in either AC-1 or AC-2 of SLITRK4 gene were examined for the corrected inactivation allele ratio (CIAR), resulting in the determination of a reference range of CIAR <3.8 in non-neoplastic cell/tissue samples. Using this analytical method, 49% (21/43) of neoplastic tissue samples from dogs showed a CIAR >3.8, indicating the presence of a clonal population. Through the present study, the availability of canine XCIP analysis was improved by incorporating the examination of the SLITRK4 gene, providing a highly useful laboratory examination system for the detection of the clonality of various cell/tissue samples in dogs.

Social Integration and Terminal Decline in Life Satisfaction Among Older Japanese

Objectives

Well-being typically exhibits pronounced deteriorations with approaching death, with sizeable interindividual variations in levels and changes. It is less well understood how psychosocial factors contribute to these individual differences. We examined whether and how social integration is associated with terminal trajectories of well-being, indexed as life satisfaction.

Method

Data were drawn from 1,119 deceased Japanese participants of a 15-year longitudinal study (age at death: M = 79.2 years; SD = 7.7 years; 43.1% women). Life satisfaction, structural and functional features of social integration (e.g., frequency of contact with family and nonfamily, and perceived overall support, respectively), sociodemographic characteristics, and physical function were assessed.

Results

Social integration predicted individual differences in terminal decline in life satisfaction, after controlling for age at death, gender, education, and physical function: More diverse social relationships were associated with higher levels of life satisfaction at 1 year before death. In addition, individuals who exhibited more decline in social participation and perceived less support showed more pronounced decline with increasing proximity of death.

Discussion

This study suggests that social integration plays a protective role in late-life well-being and that sustaining an active social life and supportive social interactions may help mitigate terminal decline in well-being.

Partially Filled Flow Simulation Using Meshfree Method for High Viscosity Fluid in Plastic Mixer

A novel simulation technique for the flow in plastic mixers based on Element-free Galerkin Method (EFGM) has been developed in this study. To improve the simulation accuracy, a “rearrangement” scheme has been employed which eliminates errors caused by the irregular distribution of data points. Through several numerical tests, the new simulation technique has been validated to be applicable to high viscosity fluid flow with enough accuracy. Furthermore, simulation examples for realistic mixers were carried out using the developed technique. From the results, it was found that the developed technique is capable to investigate the relationship between flow behavior inside realistic mixers and operating conditions.

Association between long-term care and chronic and lifestyle-related disease modified by social profiles in community-dwelling people aged 80 and 90; SONIC study

BACKGROUND

Chronic and lifestyle-related diseases and social status were reported to be associated with long-term care (LTC). The social factors should be treated as social sub-groups of which characteristics show social profiles. However, few previous studies considered that. The present study aimed to investigate the associations between LTC and chronic and lifestyle-related diseases, and whether the associations were modified by the social sub-groups in the community-dwelling elderly.

METHOD

A cross-sectional study was conducted among 1004 community-dwelling participants aged 80 and 90. LTC was used as the outcome. Chronic and lifestyle-related diseases (i.e., stroke, heart disease, joint pain, osteoporosis, lung disease, cancer, hypertension, dyslipidemia, and diabetes) were used as the predictors. Education, household income, residential area, and support environment were analyzed by latent class analysis (LCA) to derive social profiles. We obtained odds ratios (ORs) of LTC from those diseases and tested interactions between those diseases and the social profiles by logistic regression analyses.

RESULT

The participants were categorized into two sub-groups of social factors (n = 675 and 329) by LCA. Logistic regression analyses showed ORs (95% CI) of LTC were 4.69 (2.49, 8.71) from stroke, 2.22 (1.46, 3.38) from joint pain, 1.99 (1.22, 3.25) from osteoporosis, and 2.05 (1.22, 3.40) from cancer adjusting for the social sub-groups. There were no significant interactions between the social subgroups and those diseases in relation to LTC except for osteoporosis.

CONCLUSION

The associations between LTC and chronic and lifestyle-related diseases were significant with adjusting for the social sub-groups, and not modified by that except osteoporosis.