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1.  Association of inflammatory markers with subclinical atherosclerosis in middle-aged white, Japanese-American, and Japanese men: the ERA-JUMP Study 
Aim
To examine whether the inflammatory markers, C-reactive protein (CRP) and fibrinogen, are associated with biomarkers of atherosclerosis [carotid intima-media thickness (IMT) and coronary artery calcification (CAC)] in the general male population, including Asians.
METHODS
Population-based samples of 310 Japanese, 293 Japanese-American and 297 White men aged 40-49 years without clinical cardiovascular disease had IMT, CAC, CRP and fibrinogen levels, and other conventional risk factors measured using standardized methods. Statistical associations between the variables were evaluated using multiple linear or logistic regression models.
RESULTS
The Japanese group had significantly lower levels of inflammatory markers and subclinical atherosclerosis than the Japanese-American and White groups (P-values all <0.001). The mean levels of CRP were 0.66 vs. 1.11 and 1.47 mg/L, and fibrinogen 255.0 vs. 313.0 and 291.5 mg/dl, respectively. Mean carotid IMT was 0.61 vs. 0.73 and 0.68 mm, and the prevalence of CAC 11.6% vs. 32.1% and 26.3%, respectively. Body mass index (BMI) showed significant positive associations with both CRP and fibrinogen levels. Although CRP showed a significant positive association with IMT in Japanese men, this association became non-significant after adjustment for traditional risk factors or BMI. In all three populations, CRP was not associated significantly with the prevalence of CAC. Similarly, fibrinogen did not show a significant association with either IMT or the prevalence of CAC.
CONCLUSIONS
The associations of inflammatory markers with subclinical atherosclerosis may merely reflect the strong association of BMI with inflammatory markers and subclinical atherosclerosis in both Eastern and Western populations.
doi:10.5551/jat.23580
PMCID: PMC4449327  PMID: 25445888
obesity; C-reactive protein; fibrinogen; intima-media thickness; coronary artery calcification
2.  Dietary carbohydrate, glycemic index, glycemic load, and risk of prostate cancer in the Prostate, Lung, Colorectal, and Ovarian Cancer Screening Trial (PLCO) cohort 
Cancer causes & control : CCC  2011;22(7):995-1002.
Objective
To evaluate the associations between dietary carbohydrate, glycemic index (GI), glycemic load (GL), and incident prostate cancer in the Prostate, Lung, Colorectal, and Ovarian Cancer Screening Trial (PLCO) cohort.
Methods
Between September 1993 and September 2000, 38,343 men were randomized to the screening arm of the trial at one of 10 PLCO centers. A food frequency questionnaire administered at baseline assessed usual dietary intake over the preceding 12 months. Prostate cancer was ascertained by medical follow-up of suspicious screening results and annual mailed questionnaires and confirmed with medical records. Cox proportional hazards regression was used to model the associations of carbohydrate, GI, and GL with prostate cancer risk.
Results
During follow-up (median = 9.2 years), 2,436 incident prostate cancers were identified among 30,482 eligible participants. Overall, there were no associations of baseline carbohydrate, GI, or GL with incident prostate cancer in minimally or fully adjusted models. There were no associations when the 228 advanced and 2,208 non-advanced cancers were analyzed separately.
Conclusions
Dietary carbohydrate, GI, and GL were not associated with incident prostate cancer in PLCO. The narrow range of GI in this cohort may have limited our ability to detect associations, an issue that future studies should address.
doi:10.1007/s10552-011-9772-1
PMCID: PMC4470253  PMID: 21553078
Prostatic neoplasms; Dietary carbohydrates; Glycemic index
3.  Late-Life Factors Associated With Healthy Aging in Older Men 
OBJECTIVES
To identify potentially modifiable late-life biological, lifestyle and sociodemographic factors associated with overall and healthy survival to age 85.
DESIGN
Prospective longitudinal cohort study with 21 years of follow-up (1991–2012)
SETTING
The Hawaii Lifespan Study
PARTICIPANTS
1,292 American men of Japanese ancestry (mean age 75.7 years, range 71–82 years) without baseline major clinical morbidity and functional impairments.
MEASUREMENTS
Overall survival and healthy survival (free from six major chronic diseases and without physical or cognitive impairment) to age 85. Factors were measured at late-life baseline examinations (1991–1993).
RESULTS
Of 1,292 participants, 1,000 men (77%) survived to age 85 years (34% healthy) and 309 (24%) survived to age 95 years (<1% healthy). Late-life factors associated with survival and/or healthy survival included biological (body mass index, ankle:brachial index, cognitive score, blood pressure, inflammatory markers); lifestyle (smoking, alcohol use, physical activity), and sociodemographic factors (education, marital status). Cumulative late-life baseline risk factor models demonstrated that age-standardized (at 70 years) probability of survival to age 95 years ranged from 27% (no factors) to 7% (≥5 factors); to age 100 years ranged from 4% (no factors) to 0.1% (≥5 factors). Age-standardized (at 70 years) probability of healthy survival to 90 years ranged from 4% (no factors) to 0.01% (≥ 5 factors). There were nine healthy survivors at age 95 years and one healthy survivor at age 100 years.
CONCLUSION
Several potentially modifiable risk factors in men in late-life (mean age 75.7 years) were associated with markedly increased probability of subsequent healthy survival and longevity.
doi:10.1111/jgs.12796
PMCID: PMC4024082  PMID: 24779449
healthy aging; risk factors; longevity; longitudinal cohort study; late-life
4.  Oxidative Stress and Longevity in Okinawa: An Investigation of Blood Lipid Peroxidation and Tocopherol in Okinawan Centenarians 
Background. The Free Radical Theory of Aging mechanistically links oxidative stress to aging. Okinawa has among the world's longest-lived populations but oxidative stress in this population has not been well characterized. Methods. We compared plasma lipid peroxide (LPO) and vitamin E—plasma and intracellular tocopherol levels (total α, β, and γ), in centenarians with younger controls. Results. Both LPO and vitamin E tocopherols were lower in centenarians, with the exception of intracellular β-tocopherol, which was significantly higher in centenarians versus younger controls. There were no significant differences between age groups for tocopherol: cholesterol and tocopherol: LPO ratios. Correlations were found between α-Tocopherol and LPO in septuagenarians but not in centenarians. Conclusions. The low plasma level of LPO in Okinawan centenarians, compared to younger controls, argues for protection against oxidative stress in the centenarian population and is consistent with the predictions of the Free Radical Theory of Aging. However, the present work does not strongly support a role for vitamin E in this phenomenon. The role of intracellular β-tocopherol deserves additional study. More research is needed on the contribution of oxidative stress and antioxidants to human longevity.
doi:10.1155/2010/380460
PMCID: PMC3068305  PMID: 21490698
5.  Body Mass Index and Risk of Death in Asian Americans 
American journal of public health  2014;104(3):520-525.
Objective
To investigate the association between body mass index (BMI) and mortality among Asian Americans
Methods
We pooled data from prospective cohort studies that included 20,672 Asian American adults with no history of cancer or heart disease at baseline. Hazard ratios and 95% confidence intervals (CI) were estimated using Cox proportional hazards models.
Results
A high, but not low, BMI was associated with an increased risk of total mortality among individuals 35–69 years old. BMI was not related to total mortality among individuals ≥70 years old. With a BMI 22.5–<25 as the reference category among 35–69 year old never smokers the hazard ratios (95% CI) for total mortality were 0.83 (0.47–1.47) for BMI 15–<18.5, 0.91 (0.62–1.32) for BMI 18.5–<20, 1.08 (0.86–1.36) for BMI 20–<22.5, 1.14 (0.90–1.44) for BMI 25–<27.5, 1.13 (0.79–1.62) for BMI 27.5–<30, 1.82 (1.25–2.64) for BMI 30–<35, and 2.09 (1.06–4.11) for BMI 35–50. Higher BMI was also related to an increased mortality from cardiovascular disease and cancer.
Conclusions
A high BMI is associated with increased risk of mortality among Asian Americans.
doi:10.2105/AJPH.2013.301573
PMCID: PMC3953786  PMID: 24432919
6.  Association Analyses of Insulin Signaling Pathway Gene Polymorphisms With Healthy Aging and Longevity in Americans of Japanese Ancestry 
Evidence from model organisms suggests that the insulin/IGF-1 signaling pathway has an important, evolutionarily conserved influence over rate of aging and thus longevity. In humans, the FOXO3 gene is the only widely replicated insulin/IGF-1 signaling pathway gene associated with longevity across multiple populations. Therefore, we conducted a nested case–control study of other insulin/IGF-1 signaling genes and longevity, utilizing a large, homogeneous, long-lived population of American men of Japanese ancestry, well characterized for aging phenotypes. Genotyping was performed of single nucleotide polymorphisms, tagging most of the genetic variation across several genes in the insulin/IGF-1 signaling pathway or related gene networks that may be influenced by FOXO3, namely, ATF4, CBL, CDKN2, EXO1, and JUN. Two initial, marginal associations with longevity did not remain significant after correction for multiple comparisons, nor were they correlated with aging-related phenotypes.
doi:10.1093/gerona/glt082
PMCID: PMC3968832  PMID: 23770741
Longevity; Molecular genetics; Insulin signaling genes; Human.
7.  Association of Total Marine Fatty Acids, Eicosapentaenoic and Docosahexaenoic Acids, With Aortic Stiffness in Koreans, Whites, and Japanese Americans 
American Journal of Hypertension  2013;26(11):1321-1327.
BACKGROUND
Few previous studies have reported the association of aortic stiffness with marine n-3 fatty acids (Fas) in the general population. The aim of this study was to determine the combined and independent associations of 2 major marine n-3 FAs, eicosapentaenoic acid (EPA) and docosahexaenoic acid (DHA), with aortic stiffness evaluated using carotid–femoral pulse wave velocity (cfPWV) in Korean, white, and Japanese American men.
METHODS
A population-based sample of 851 middle-aged men (299 Koreans, 266 whites, and 286 Japanese Americans) was examined for cfPWV during 2002–2006. Serum FAs, including EPA and DHA, were measured as a percentage of total FAs using gas chromatography. Multiple regression analysis was used to examine the association of EPA and DHA with cfPWV after adjusting for blood pressure and other confounders.
RESULTS
Mean EPA and DHA levels were 1.9 (SD = 1.0) and 4.8 (SD = 1.4) for Koreans, 0.8 (SD = 0.6) and 2.4 (SD = 1.2) for whites, and 1.0 (SD = 1.0) and 3.2 (SD = 1.4) for Japanese Americans. Both EPA and DHA were significantly higher in Koreans than in the other 2 groups (P < 0.01). Multiple regression analyses in Koreans showed that cfPWV had a significant inverse association with total marine n-3 FAs and with EPA alone after adjusting for blood pressure and other potential confounders. In contrast, there was no significant association of cfPWV with DHA. Whites and Japanese Americans did not show any significant associations of cfPWV with total marine n-3 FAs, EPA, or DHA.
CONCLUSIONS
High levels of EPA observed in Koreans have an inverse association with aortic stiffness.
doi:10.1093/ajh/hpt107
PMCID: PMC3790451  PMID: 23820020
aortic stiffness; blood pressure; carotid femoral pulse wave velocity; docosahexaenoic acid; eicosapentaenoic acid; fish oil; hypertension.
8.  Do Differences in Risk Factors Explain the Lower Rates of Coronary Heart Disease in Japanese Versus U.S. Women? 
Journal of Women's Health  2013;22(11):966-977.
Abstract
Background
Mortality from coronary heart disease (CHD) in women in Japan is one of the lowest in developed countries. In an attempt to shed some light on possible reasons of lower CHD in women in Japan compared with the United States, we extensively reviewed and analyzed existing national data and recent literature.
Methods
We searched recent epidemiological studies that reported incidence of acute myocardial infarction (AMI) and examined risk factors for CHD in women in Japan. Then, we compared trends in risk factors between women currently aged 50–69 years in Japan and the United States, using national statistics and other available resources.
Results
Recent epidemiological studies have clearly shown that AMI incidence in women in Japan is lower than that reported from other countries, and that lipids, blood pressure (BP), diabetes, smoking, and early menopause are independent risk factors. Comparing trends in risk factors between women in Japan and the United States, current levels of serum total cholesterol are higher in women in Japan and levels have been similar at least since 1990. Levels of BP have been higher in in Japan for the past 3 decades. Prevalence of type 2 diabetes has been similar in Japanese and white women currently aged 60–69 for the past 2 decades. In contrast, rates of cigarette smoking, although low in women in both countries, have been lower in women in Japan.
Conclusions
Differences in risk factors and their trends are unlikely to explain the difference in CHD rates in women in Japan and the United States. Determining the currently unknown factors responsible for low CHD mortality in women in Japan may lead to new strategy for CHD prevention.
doi:10.1089/jwh.2012.4087
PMCID: PMC3820126  PMID: 24073782
9.  A cross-sectional association of obesity with coronary calcium among Japanese, Koreans, Japanese Americans, and US Whites 
Aims
Conflicting evidence exists regarding whether obesity is independently associated with coronary artery calcium (CAC), a measure of coronary atherosclerosis. We examined an independent association of obesity with prevalent CAC among samples of multi-ethnic groups whose background populations have varying levels of obesity and coronary heart disease (CHD).
Methods and results
We analysed a population-based sample of 1212 men, aged 40–49 years free of clinical cardiovascular disease recruited in 2002–06; 310 Japanese in Japan (JJ), 294 Koreans in South Korea (KN), 300 Japanese Americans (JA), and 308 Whites in the USA (UW). We defined prevalent CAC as an Agatston score of ≥10. Prevalent CAC was calculated by tertile of the body mass index (BMI) in each ethnic group and was plotted against the corresponding median of tertile BMI. Additionally, logistic regression was conducted to examine whether an association of the BMI was independent of conventional risk factors. The median BMI and crude prevalence of CAC for JJ, KN, JA, and UW were 23.4, 24.4, 27.4, and 27.1 (kg/m2); 12, 11, 32, and 26 (%), respectively. Despite the absolute difference in levels of BMI and CAC across groups, higher BMI was generally associated with higher prevalent CAC in each group. After adjusting for age, smoking, alcohol, hypertension, lipids, and diabetes mellitus, the BMI was positively and independently associated with prevalent CAC in JJ, KN, UW, but not in JA.
Conclusion
In this multi-ethnic study, obesity was independently associated with subclinical stage of coronary atherosclerosis among men aged 40–49 years regardless of the BMI level.
doi:10.1093/ehjci/jet080
PMCID: PMC3738098  PMID: 23764486
Coronary artery calcium; Obesity; Body mass index; Multi-ethnic; Men; Risk factors
10.  Particle Numbers of Lipoprotein Subclasses and Arterial Stiffness among Middle-aged men from the ERA JUMP study 
Journal of human hypertension  2013;28(2):111-117.
We examined the association between serum lipoprotein subclasses and the three measures of arterial stiffness i.e. (i) carotid-femoral pulse wave velocity (cfPWV) which is a gold standard measure of central arterial stiffness, (ii) brachial-ankle PWV (baPWV) which is emerging as a combined measure of central and peripheral arterial stiffness, and (iii) femoral-ankle PWV (faPWV) which is a measure of peripheral arterial stiffness. Among a population-based sample of 701 apparently healthy Caucasian, Japanese American and Korean men aged 40–49 years, concentrations of lipoprotein particles were assessed by nuclear magnetic resonance (NMR) spectroscopy, and PWV was assessed with an automated waveform analyzer (VP2000, Omron, Japan). Multiple linear regressions were performed to analyze the association between each NMR lipoprotein subclasses and PWV measures, after adjusting for cardiovascular risk factors and other confounders. A cut-off of p<0.01 was used for determining significance. All PWV measures had significant correlations with total and small low-density lipoprotein particle number (LDL-P) (all p<0.0001) but not LDL-cholesterol (LDL-C) (all p>0.1), independent of race and age. In multivariate regression analysis, no NMR lipoprotein subclass was significantly associated with cfPWV (all p>0.01). However, most NMR lipoprotein subclasses had significant associations with both baPWV and faPWV (p<0.01). In this study of healthy middle-aged men, as compared to cfPWV, both baPWV and faPWV had stronger associations with particle numbers of lipoprotein subclasses. Our results may suggest that both baPWV and faPWV are related to arterial stiffness and atherosclerosis, whereas cfPWV may represent arterial stiffness alone.
doi:10.1038/jhh.2013.60
PMCID: PMC3800263  PMID: 23823580
lipoproteins; lipoprotein fractions; pulse wave velocity; atherosclerosis
11.  The Associations of Indices of Obesity with Lipoprotein Subfractions in Japanese American, African American and Korean Men 
Global heart  2013;8(3):273-280.
Background
Both indices of obesity and lipoprotein subfractions contribute to coronary heart disease risk. However, associations between indices of obesity and lipoprotein subfractions remain undetermined across different ethnic groups. This study aims to examine the associations of indices of obesity in Japanese Americans (JA), African Americans (AA) and Koreans with lipoprotein subfractions.
Methods
A population-based sample of 230 JA, 91 AA, and 291 Korean men aged 40–49 was examined for indices of obesity, i.e., visceral and subcutaneous adipose tissue (VAT and SAT, respectively), waist circumference (WC), and body-mass index (BMI), and for lipoprotein subfractions by nuclear-magnetic-resonance spectroscopy. Multiple regression analyses were performed in each of the three ethnic groups to examine the associations of each index of obesity with lipoprotein.
Results
VAT had significant positive associations with total and small low-density lipoprotein (LDL) and a significant negative association with large high-density lipoprotein (HDL) in all three ethnicities (p < 0.01). SAT, WC, and BMI had significant positive associations with total and small LDL in only JA and Koreans, while these indices had significant inverse associations with large HDL in all ethnic groups (p < 0.01). Compared to SAT, VAT had larger R2 values in the associations with total and small LDL and large HDL in all three ethnic groups.
Conclusions
VAT is significantly associated with total and small LDL and large HDL in all three ethnic groups. The associations of SAT, WC, and BMI with lipoprotein subfractions are weaker compared to VAT in all three ethnic groups.
doi:10.1016/j.gheart.2013.07.001
PMCID: PMC4110345  PMID: 25068101
visceral adipose tissue; subcutaneous adipose tissue; body-mass index; waist circumference; lipoprotein subfractions
12.  Shorter Men Live Longer: Association of Height with Longevity and FOXO3 Genotype in American Men of Japanese Ancestry 
PLoS ONE  2014;9(5):e94385.
Objectives
To determine the relation between height, FOXO3 genotype and age of death in humans.
Methods
Observational study of 8,003 American men of Japanese ancestry from the Honolulu Heart Program/Honolulu-Asia Aging Study (HHP/HAAS), a genetically and culturally homogeneous cohort followed for over 40 years. A Cox regression model with age as the time scale, stratified by year of birth, was used to estimate the effect of baseline height on mortality during follow-up. An analysis of height and longevity-associated variants of the key regulatory gene in the insulin/IGF-1 signaling (IIS) pathway, FOXO3, was performed in a HHP-HAAS subpopulation. A study of fasting insulin level and height was conducted in another HHP-HAAS subpopulation.
Results
A positive association was found between baseline height and all-cause mortality (RR = 1.007; 95% CI 1.003–1.011; P = 0.002) over the follow-up period. Adjustments for possible confounding variables reduced this association only slightly (RR = 1.006; 95% CI 1.002–1.010; P = 0.007). In addition, height was positively associated with all cancer mortality and mortality from cancer unrelated to smoking. A Cox regression model with time-dependent covariates showed that relative risk for baseline height on mortality increased as the population aged. Comparison of genotypes of a longevity-associated single nucleotide polymorphism in FOXO3 showed that the longevity allele was inversely associated with height. This finding was consistent with prior findings in model organisms of aging. Height was also positively associated with fasting blood insulin level, a risk factor for mortality. Regression analysis of fasting insulin level (mIU/L) on height (cm) adjusting for the age both data were collected yielded a regression coefficient of 0.26 (95% CI 0.10–0.42; P = 0.001).
Conclusion
Height in mid-life is positively associated with mortality, with shorter stature predicting longer lifespan. Height was, moreover, associated with fasting insulin level and the longevity genotype of FOXO3, consistent with a mechanistic role for the IIS pathway.
doi:10.1371/journal.pone.0094385
PMCID: PMC4013008  PMID: 24804734
13.  Long-chain n-3 polyunsaturated fatty acids and incidence rate of coronary artery calcification in Japanese in Japan and United States whites – population-based prospective cohort study 
Heart (British Cardiac Society)  2013;100(7):569-573.
Objective
To determine whether serum levels of long-chain n-3 polyunsaturated fatty acids (LCn3PUFAs) contribute to the difference in incidence rate of coronary artery calcification (CAC) between Japanese in Japan and U.S. whites.
Methods
In a population-based prospective-cohort study, 214 Japanese and 152 white men aged 40–49 years at baseline (2002–2006) with coronary calcium score (CCS) = 0 were reexamined for CAC in 2007–2010. Among these, 175 Japanese and 113 whites participated in the follow-up exam. Incident cases were defined as participants with CCS ≥ 10 at follow-up. A relative risk regression analysis was used to model incidence rate ratio between Japanese and whites. The incidence rate ratio was first adjusted for potential confounders at baseline and then further adjusted for serum LCn3PUFAs at baseline.
Results
Mean (standard deviation) serum percentage of LCn3PUFA was > 100% higher in Japanese than in whites (9.08 (2.49) versus 3.84 (1.79), respectively, p<0.01). Japanese had a significantly lower incidence rate of CAC compared to whites (0.9 versus 2.9/100 person-years, respectively, p < 0.01). Incidence rate ratio of CAC taking follow-up time into account between Japanese and white men was 0.321 (95% confidence interval (CI) 0.150, 0.690: p<0.01). After adjusting for age, systolic-blood pressure, low-density-lipoprotein cholesterol, diabetes, and other potential confounders, the ratio remained significant: 0.262 (95% CI: 0.094, 0.731, p=0.01). After further adjusting for LCn3PUFAs, however, the ratio was attenuated and became non-significant (0.376 (95% CI: 0.090, 1.572, p=0.18).
Conclusions
LCn3PUFAs significantly contributed to the difference in CAC incidence between Japanese and white men.
doi:10.1136/heartjnl-2013-304421
PMCID: PMC3949146  PMID: 24352736
long-chain n-3 fatty acids; coronary artery calcification; prospective cohort study; incidence; risk factors
14.  Regional pulse wave velocities and their cardiovascular risk factors among healthy middle-aged men: a cross-sectional population-based study 
Background
Both carotid-femoral (cf) pulse wave velocity (PWV) and brachial-ankle (ba) PWV employ arterial sites that are not consistent with the path of blood flow. Few previous studies have reported the differential characteristics between cfPWV and baPWV by simultaneously comparing these with measures of pure central (aorta) and peripheral (leg) arterial stiffness, i.e., heart-femoral (hf) PWV and femoral-ankle (fa) PWV in healthy populations. We aimed to identify the degree to which these commonly used measures of cfPWV and baPWV correlate with hfPWV and faPWV, respectively, and to evaluate whether both cfPWV and baPWV are consistent with either hfPWV or faPWV in their associations with cardiovascular (CV) risk factors.
Methods
A population-based sample of healthy 784 men aged 40–49 (202 white Americans, 68 African Americans, 202 Japanese-Americans, and 282 Koreans) was examined in this cross-sectional study. Four regional PWVs were simultaneously measured by an automated tonometry/plethysmography system.
Results
cfPWV correlated strongly with hfPWV (r = .81, P < .001), but weakly with faPWV (r = .12, P = .001). baPWV correlated moderately with both hfPWV (r = .47, P < .001) and faPWV (r = .62, P < .001). After stepwise regression analyses with adjustments for race, cfPWV shared common significant correlates with both hfPWV and faPWV: systolic blood pressure (BP) and body mass index (BMI). However, BMI was positively associated with hfPWV and cfPWV, and negatively associated with faPWV. baPWV shared common significant correlates with hfPWV: age and systolic BP. baPWV also shared the following correlates with faPWV: systolic BP, triglycerides, and current smoking.
Conclusions
Among healthy men aged 40 – 49, cfPWV correlated strongly with central PWV, and baPWV correlated with both central and peripheral PWVs. Of the CV risk factors, systolic BP was uniformly associated with all the regional PWVs. In the associations with factors other than systolic BP, cfPWV was consistent with central PWV, while baPWV was consistent with both central and peripheral PWVs.
doi:10.1186/1471-2261-14-5
PMCID: PMC3893368  PMID: 24410766
Arterial stiffness; Aorta; Carotid arteries; Brachial artery; Femoral artery
15.  FOXO3 Gene Variants and Human Aging: Coding Variants May Not Be Key Players 
FOXO3 is generally recognized as a “master” gene in aging since its association with longevity has been replicated in multiple organisms and human populations. A group of single nucleotide polymorphisms in linkage disequilibrium with a coding region has been associated with human longevity, but the actual functional variant is unidentified. Therefore, we sequenced the coding region in our long-lived Japanese American population in order to enhance resources for fine mapping this region. We demonstrate that of 38 published variants, 6 are misalignments with homologous nonallelic sequences from FOXO3B (ZNF286B), a pseudogene on a different chromosome; 2 are attributable to ZNF286B only, and the remaining 30 were unconfirmed, indicating that they are very rare and not likely involved in longevity. Furthermore, we identified a novel, unique, nonsynonymous coding variant in exon 3 (Gly566Ala; rs138174682) that is prevalent in multiple ethnic groups but appeared too rare for major longevity effects in our study populations.
doi:10.1093/gerona/gls067
PMCID: PMC3668389  PMID: 22459618
Aging; FOXO3; Genetic; Human longevity
16.  Serum levels of marine-derived n-3 fatty acids in Icelanders, Japanese, Koreans, and Americans - A descriptive epidemiologic study 
Summary
In the 1990’s Iceland and Japan were known as countries with high fish consumption whereas coronary heart disease (CHD) mortality in Iceland was high and that in Japan was low among developed countries. We described recent data fish consumption and CHD mortality from publicly available data. We also measured CHD risk factors and serum levels of marine-derived n-3 and other fatty acids from population-based samples of 1,324 men in Iceland, Japan, South Korea, and the US. CHD mortality in men in Iceland was almost 3 times as high as that in Japan and South Korea. Generally a profile of CHD risk factors in Icelanders compared to Japanese was more favorable. Serum marine-derived n-3 fatty acids in Iceland were significantly lower than in Japan and South Korea but significantly higher than in the US.
doi:10.1016/j.plefa.2012.04.010
PMCID: PMC3404187  PMID: 22658580
n-3 fatty acids; eicosapentaenoic acid; docosaehexaenoic acid; coronary heart disease; descriptive epidemiologic study
17.  Coronary Artery Calcification in Japanese Men in Japan and Hawaii 
American journal of epidemiology  2007;166(11):1280-1287.
Explanations for the low prevalence of atherosclerosis in Japan versus United States are often confounded with genetic variation. To help remove such confounding, coronary artery calcification (CAC), a marker of subclinical atherosclerosis, was compared between Japanese men in Japan and Japanese men in Hawaii. Findings are based on risk factor and CAC measurements that were made from 2001 to 2005 in 311 men in Japan and 300 men in Hawaii. Men were aged 40 to 50 years and without cardiovascular disease. After age-adjustment, there was a 3-fold excess in the odds of prevalent CAC scores ≥10 in Hawaii versus Japan (relative odds [RO] = 3.2; 95% confidence interval [CI] = 2.1,4.9). While men in Hawaii had a generally poorer risk factor profile, men in Japan were 4-times more likely to smoke cigarettes (49.5 vs. 12.7%, p<0.001). In spite of marked risk factor differences between the samples, none of the risk factors provided an explanation for the low amounts of CAC in Japan. After risk factor adjustment, the RO of CAC scores ≥10 in Hawaii versus Japan was 4.0 (95% CI = 2.2,7.4). Further studies are needed to identify factors that offer protection against atherosclerosis in Japanese men in Japan.
doi:10.1093/aje/kwm201
PMCID: PMC3660555  PMID: 17728270
Atherosclerosis; cohort studies; coronary disease; Japan; men; risk factors
18.  Metabolic Syndrome and Cognitive Decline Among the Oldest Old in Okinawa: In Search of a Mechanism. The KOCOA Project 
The study aim was to test whether the metabolic syndrome or its components predicted cognitive decline among persons aged 80 years and older (mean 85.0 years). Participants were members of the “Keys to Optimal Cognitive Aging Project,” a prospective cohort study in Okinawa, Japan. Metabolic syndrome was assessed at baseline. Cognitive functions were assessed annually for up to 3 years. One hundred and forty-eight participants completed at least one follow-up with 101 participating in all three assessments and 47 participating in two of the three assessments. The mean and median duration of follow-up were 1.8 and 2 years, respectively. Metabolic syndrome and four components were not associated with decline in global and executive cognitive functions. However, high glycosylated hemoglobin was associated with decline in memory function at the second follow-up. Our study supports accumulating evidence that the positive association between metabolic syndrome and cognitive function might not hold for the oldest old.
doi:10.1093/gerona/glr189
PMCID: PMC3261441  PMID: 22016359
Metabolic syndrome; Cognitive decline; Oldest old; Longitudinal study; Okinawa
19.  A POOLED ANALYSIS OF 14 COHORT STUDIES OF ANTHROPOMETRIC FACTORS AND PANCREATIC CANCER RISK 
Epidemiologic studies of pancreatic cancer risk have reported null or non-significant positive associations for obesity, while associations for height have been null. Waist and hip circumference have been evaluated infrequently.
A pooled analysis of 14 cohort studies on 846,340 individuals was conducted; 2,135 individuals were diagnosed with pancreatic cancer during follow-up. Study-specific relative risks (RRs) and 95% confidence intervals (CIs) were calculated by Cox proportional hazards models, and then pooled using a random effects model.
Compared to individuals with a body mass index (BMI) at baseline between 21–22.9kg/m2, pancreatic cancer risk was 47% higher (95%CI:23–75%) among obese (BMI≥30kg/m2) individuals. A positive association was observed for BMI in early adulthood (pooled multivariate [MV]RR = 1.30, 95%CI=1.09–1.56 comparing BMI≥25kg/m2 to a BMI between 21–22.9kg/m2). Compared to individuals who were not overweight in early adulthood (BMI<25kg/m2) and not obese at baseline (BMI<30kg/m2), pancreatic cancer risk was 54% higher (95%CI=24–93%) for those who were overweight in early adulthood and obese at baseline. We observed a 40% higher risk among individuals who had gained BMI ≥10kg/m2 between BMI at baseline and younger ages compared to individuals whose BMI remained stable. Results were either similar or slightly stronger among never smokers. A positive association was observed between waist to hip ratio (WHR) and pancreatic cancer risk (pooled MVRR=1.35 comparing the highest versus lowest quartile, 95%CI=1.03–1.78).
BMI and WHR were positively associated with pancreatic cancer risk. Maintaining normal body weight may offer a feasible approach to reducing morbidity and mortality from pancreatic cancer.
doi:10.1002/ijc.25794
PMCID: PMC3073156  PMID: 21105029
Pancreatic Cancer; Anthropometry; Pooled Analysis
21.  Body-Mass Index and Mortality among 1.46 Million White Adults 
The New England journal of medicine  2010;363(23):2211-2219.
BACKGROUND
A high body-mass index (BMI, the weight in kilograms divided by the square of the height in meters) is associated with increased mortality from cardiovascular disease and certain cancers, but the precise relationship between BMI and all-cause mortality remains uncertain.
METHODS
We used Cox regression to estimate hazard ratios and 95% confidence intervals for an association between BMI and all-cause mortality, adjusting for age, study, physical activity, alcohol consumption, education, and marital status in pooled data from 19 prospective studies encompassing 1.46 million white adults, 19 to 84 years of age (median, 58).
RESULTS
The median baseline BMI was 26.2. During a median follow-up period of 10 years (range, 5 to 28), 160,087 deaths were identified. Among healthy participants who never smoked, there was a J-shaped relationship between BMI and all-cause mortality. With a BMI of 22.5 to 24.9 as the reference category, hazard ratios among women were 1.47 (95 percent confidence interval [CI], 1.33 to 1.62) for a BMI of 15.0 to 18.4; 1.14 (95% CI, 1.07 to 1.22) for a BMI of 18.5 to 19.9; 1.00 (95% CI, 0.96 to 1.04) for a BMI of 20.0 to 22.4; 1.13 (95% CI, 1.09 to 1.17) for a BMI of 25.0 to 29.9; 1.44 (95% CI, 1.38 to 1.50) for a BMI of 30.0 to 34.9; 1.88 (95% CI, 1.77 to 2.00) for a BMI of 35.0 to 39.9; and 2.51 (95% CI, 2.30 to 2.73) for a BMI of 40.0 to 49.9. In general, the hazard ratios for the men were similar. Hazard ratios for a BMI below 20.0 were attenuated with longer-term follow-up.
CONCLUSIONS
In white adults, overweight and obesity (and possibly underweight) are associated with increased all-cause mortality. All-cause mortality is generally lowest with a BMI of 20.0 to 24.9.
doi:10.1056/NEJMoa1000367
PMCID: PMC3066051  PMID: 21121834
22.  Midlife muscle strength and human longevity up to age 100 years: a 44-year prospective study among a decedent cohort 
Age  2011;34(3):563-570.
We studied prospectively the midlife handgrip strength, living habits, and parents’ longevity as predictors of length of life up to becoming a centenarian. The participants were 2,239 men from the Honolulu Heart Program/Honolulu–Asia Aging Study who were born before the end of June 1909 and who took part in baseline physical assessment in 1965–1968, when they were 56–68 years old. Deaths were followed until the end of June 2009 for 44 years with complete ascertainment. Longevity was categorized as centenarian (≥100 years, n = 47), nonagenarian (90–99 years, n = 545), octogenarian (80–89 years, n = 847), and ≤79 years (n = 801, reference). The average survival after baseline was 20.8 years (SD = 9.62). Compared with people who died at the age of ≤79 years, centenarians belonged 2.5 times (odds ratio (OR) = 2.52, 95% confidence interval (CI) = 1.23–5.10) more often to the highest third of grip strength in midlife, were never smokers (OR = 5.75 95% CI = 3.06–10.80), had participated in physical activity outside work (OR = 1.13 per daily hour, 95% CI = 1.02–1.25), and had a long-lived mother (≥80 vs. ≤60 years, OR = 2.3, 95% CI = 1.06–5.01). Associations for nonagenarians and octogenarians were parallel, but weaker. Multivariate modeling showed that mother’s longevity and offspring’s grip strength operated through the same or overlapping pathway to longevity. High midlife grip strength and long-lived mother may indicate resilience to aging, which, combined with healthy lifestyle, increases the probability of extreme longevity.
doi:10.1007/s11357-011-9256-y
PMCID: PMC3337929  PMID: 21541735
Aging; Longevity; Inter-generational; Grip strength; Mortality; Human; Life Sciences; Molecular Medicine; Geriatrics/Gerontology; Cell Biology
23.  Physical Aspects of Healthy Aging: Assessments of Three Measures of Balance for Studies in Middle-Aged and Older Adults 
Objectives. To investigate the reliability and correlations with age of the balance components of the EPESE, NHANES, and the Good Balance Platform System (GBPS) in a normal population of adults. Design. Cross-sectional. Setting. Urban Medical Center in the Pacific. Participants. A random sample of 203 healthy offspring of Honolulu Heart Program participants, ages 38–71. Measurements. Subjects were examined twice at visits one week apart using the balance components of the EPESE, NHANES, and the good balance system tests. Results. The EPESE and NHANES batteries of tests were not sufficiently challenging to allow successful discrimination among subjects in good health, even older subjects. The GBPS allowed objective quantitative measurements, but the test-retest correlations generally were not high. The GBPS variables correlated with age only when subjects stood on a foam pad; they also were correlated with anthropometric variables. Conclusion. Both EPESE and NHANES balance tests were too easy for healthy subjects. The GBPS had generally low reliability coefficients except for the most difficult testing condition (foam pad, eyes closed). Both height and body fat were associated with GBPS scores, necessitating adjusting for these variables if using balance as a predictor of future health.
doi:10.1155/2010/849761
PMCID: PMC3062992  PMID: 21437003
24.  Energy Intake and Risk of Postmenopausal Breast Cancer: An Expanded Analysis in the Prostate, Lung, Colorectal, and Ovarian Cancer Screening Trial (PLCO) Cohort 
Although animal experiments have consistently demonstrated a positive relationship between breast cancer and energy intake, evidence from human studies remains inconclusive. In the Prostate, Lung, Colorectal, and Ovarian Cancer Screening Trial cohort, 29,170 women, aged 55–75 years, who successfully completed a food frequency questionnaire (FFQ) at entry (1993–2001), were followed through 2007; 1,319 incident breast cancers were ascertained (median time from FFQ completion to diagnosis, 4.4 y). Women in the highest quartile of energy intake, relative to the lowest, had modestly, but significantly, increased breast cancer risk [multivariate relative risk (RR), 1.21; 95% confidence interval (95% CI), 1.03–1.42; Ptrend = 0.03]. Including body mass index and physical activity in the model reduced risk slightly (RR, 1.18; 95% CI, 1.00–1.39; Ptrend = 0.07). However, in similar analyses using energy intake from a FFQ administered approximately 5 years after entry (27,428 women; 806 incident breast cancers; median time from FFQ completion to diagnosis, 2.7 y), women in the highest and lowest quartiles of energy intake had similar risk. When follow-up time after the first FFQ was divided into three four-year periods, the multivariate RRs for high versus low energy intake increased from 1.21 to 1.37 to 1.55 with increasing time since dietary assessment. Although the divergent results for the two FFQs could be due to subtle questionnaire differences, our findings suggest a modest positive association between energy intake and postmenopausal breast cancer that strengthens with time since dietary assessment.
doi:10.1158/1055-9965.EPI-09-0087
PMCID: PMC2783562  PMID: 19843674
breast cancer; energy intake; energy balance; cohort
25.  Linkage disequilibrium of single-nucleotide polymorphism data: how sampling methods affect estimates of linkage disequilibrium 
BMC Proceedings  2009;3(Suppl 7):S105.
Linkage disequilibrium (LD) is an important measure used in the analysis of single-nucleotide polymorphism (SNP) data. We used the Genetic Analysis Workshop 16 (GAW16) Framingham Heart Study 500 k SNP data to explore the effect of sampling methods on estimating of LD for SNP data.
Method and data
We found 332 trios in the GAW16 Framingham SNP data. Repeated random samples without replacement, of different sizes of trios and independent individuals, are drawn from these 332 trios. For each sample, the LD is calculated using the Haploview program for the chromosome 1 SNP data. Percents of D' > 0.8 and r2 > 0.8 are calculated for different distance bins based on the Haploview output. The results are summarized by sample size and sampling methods to give us an overall view of the effect of sample size and sampling methods on the LD estimation.
Results
Trios design gave stable estimates. A sample of 30 to 40 trios gave estimates of percent of LD > 0.8 very close to those from 332 trios. When independent individuals are used, the estimates are less stable and are different from those obtained from the 332 trios for both D' and r2, with larger differences for D'.
Conclusion
Our results suggest that trio design gives a stable estimate of LD. Therefore it may be more suitable for LD analysis than using independent individuals. We must be cautious when comparing the LD estimates from trios, and those from independent individuals.
PMCID: PMC2795876  PMID: 20017969

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