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Objective:To investigate the protective effect of hyperbaric oxygen therapy(HBOT)on myocardial fibrosis and oxidative stress induced by D-galactose(D-gal)in senescent model mice and its possible mechanism.Methods:Three-month-old male Kunming mice(n=27)were randomized into control, D-gal, and D-gal + HBOT groups.The control group received subcutaneous sterilized saline(5 ml · kg -1· d -1)for 8 weeks; the remaining 2 groups received subcutaneous D-gal(200 mg · kg -1· d -1)for 8 weeks. The D-gal + HBOT group underwent HBOT intervention at week 7~8.At the end of the experiment, the histopathological changes were analyzed by hematoxylin-eosin(HE)staining, and the fibrosis changes were analyzed by Masson staining and Sirius red staining.Oxidative stress kit was used to detect catalase(CAT), total superoxide dismutase(T-SOD)activity and malon-di-aldehyde(MDA)content in serum of mice.Western blotting was used to detect the expression levels of the aging-related proteins p53 and p16 in mouse heart tissue, the heart-function-related proteins atrial natriuretic peptide(ANP)and brain natriuretic peptide(BNP), and the oxidative stress-related protein superoxide dismutase 1(SOD1), superoxide dismutase 2(SOD2)and catalase(CAT). Results:Cardiac morphologic staining indicated that as compared with the control group, mice of D-gal group exhibited features of senescence and the increased fibrosis area, and senescence and fibrosis were obviously improved after HBOT intervention as compared with the D-gal group.The findings of the oxidative stress kit measurement indicated that as compared with the control group, the D-gal group had markedly decreased activities of CAT and T-SOD, significantly increased MDA content in the serum.After HBOT treatment, as compared with d-gal group, serum CAT and T-SOD activities were increased, while MDA content was decreased( F=126.85, 32.89, 157.50, all P<0.05).Furthermore, as compared with the control group, the D-gal group had obviously increased contents of p53, p16, ANP and BNP, while the content of CAT, SOD1 and SOD2 were obviously decreased.After HBOT intervention, as compared with the D-gal group, the contents of p53, p16, ANP、BNP were reduced, while the content of CAT, SOD1 and SOD2 were increased( F=36.37, 14.81, 23.28, 58.41, 12.79, 80.08, 6.63, all P<0.05). Conclusions:HBOT intervention could protects against cardiac injury in aging mice, which may be related to attenuating myocardial fibrosis, inducing the expression of antioxidant enzymes, and reducing oxidative stress.
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Objective To investigate the impact of sarcopenia on muscle strength and exercise capacity in elderly patients with chronic heart failure (CHF).Methods One hundred and sixteen inpatient aged ≥65 years with CHF were enrolled in the study.General clinical characteristics were collected with questionnaire;the appendicular skeletal muscle mass (ASM) was assessed with body composition analyzer;the arm muscle strength was measured and a 6m-walk test was performed.The sarcopenia was evaluated according to the Asian Working Group for Sarcopenia (AWGS) criteria.Simple regression analysis and logistic regression were used to analyze the correlation between sarcopenia and decreased muscle strength,exercise capacity in elderly CHF patients.Results Among 116 elderly CHF patients,sarcopenia was confirmed in 42 patients(36.2％).Patients with sarcopenia had poorer cardiac function and lower muscle strength,ASM and 6m-walking speed than patients without sarcopenia did(allP＜0.05).Simple regression analysis showed positive correlation between ASM and muscle strength in both groups.Logistic regression analysis showed that after adjustment for confounders,ASM reduction was an independent risk factor for reducedexercisecapacity(OR=0.158,95％CI:0.055-0.455,P＜0.05).Conclusion Sarcopenia is a common complication in elderly patients with CHF and may lead to decreased muscle strength and exercise capacity.
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Objective To investigate the association between sarcopenia and nutritional status among inpatients aged 80 years and over.Methods A total of 120 patients aged ≥80 years admitted into geriatrics department of a third-grade first-class hospital in Shandong province who met inclusion and exclusion criteria were enrolled from March 2017 to March 2018 in this cross-sectional study.According to diagnostic criteria of Asian Working Group for Sarcopenia,patients were divided into the sarcopenia group and the non-sarcopenia group.General clinical data were collected.Nutritional assessment was validated by using Mini Nutritional Assessment(MNA)and the determined nutritional indexes of serum levels of hemoglobin and albumin.Univariate and multivariate analysis were used to analyze the association between sarcopenia and nutritional status.Results Of 120 inpatients aged ≥ 80,28 cases(23.3％)had sarcopenia,including 20 men(71.4％)and 8 women(28.6％).The incidences of sarcomenia were 1.4％ (1 case)in patients with normal nutritional status and 100％ (6 cases)in patients with malnutrition.Compared with the non-sarcopenia group,the sarcopenia group had lower levels of body mass index,serum hemoglobin,serum albumin and MNA scores[(20.0 ± 2.2) kg/m2 vs.(25.4±3.0)kg/m2,(34.5±3.4)g/L vs.(38.6±3.5)g/L,(114.4± 14.0)g/L vs.(127.3± 14.8) g/L,(8.8 ± 1.9) score vs.(12.7 ± 1.4) score,P ＜ 0.05].After adjustment for all covariates,multivariate Logistic regression analysis showed that MNA score was an independent risk factor for sarcopenia(OR =0.118,95％CI:0.026-0.530).Conclusions The incidence of sarcopenia is high in hospitalized patients aged 80 years and older.MNA score is an independent risk factor for sarcopenia.
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Objective To explore the association between the polymorphism rs671 site of the acetaldehyde dehydrogenase 2 (ALDH2) gene and H-type hypertension in the elderly in Han nationality in Qingdao.Methods Totally 406 patients aged 60-90 years with primary hypertension were randomly selected in the study.Serum levels of homocysteine(Hcy),folate and vitamin B12 were determined and all patients were divided into H-type hypertension group and non H-type hypertension group.Gene chip technology was used to analyze the ALDH2 (rs671) polymorphism,and the association between ALDH2 gene and H type hypertension was evaluated.Results Of all hypertensive participants,82.0％ (333/406) were in H-type hypertension,87.4％ (221/253) in male and 73.2％ (112/153) in female.The GA/AA genotype and A allele frequency were higher in H-type hypertension group than in non H-type hypertension group [37.2 ％ (124/333) vs.16.4 ％ (12/73) and 21.3％(71/333) vs.9.6％(7/73),P=0.001and 0.021].Serum Hcyleveland the prevalence of H type hypertension were higher in GA/AA genotype group than in GG genotype group(both P＜ 0.05).Logistic regression analysis showed that GA/AA genotype,gender (male),drinking,folate deficiency and increased systolic pressure were the risk factors for H-type hypertension (OR=3.17,2.14,2.37,0.75,1.03,respectively,all P＜ 0.05).Conclusions The genetic variation of ALDH2(rs671) may increase Hcy level by decreasing the levels of folate and vitamin B12.GA/AA genotype is a risk factor for H-type hypertension,and it contributes to H-type hypertension together with gender,drinking history,folate levels and systolic pressure.