Background and aim: Maternal obesity has been related to offspring predisposition to cardiometabolic disease development throughout life. Thus, this study aimed to analyze the impact of maternal obesity on cardiac progenitor cells and cardiometabolic disease of adult offspring.
Methods and results: The litter size reduction experimental model was used to induce obesity in female Swiss mice. Small Litter Dam (SLD-F1) and Normal Litter Dam (NLD-F1) were crossed with healthy male mice, and their offspring were followed up until 90 days old when they were euthanized. Adult offspring of obese dams (SLD-F2) had increased body mass, Lee Index and fat deposits. Heart analysis demonstrated cardiac hypertrophy, fibrosis, oxidative stress, increased cardiac mast cell number, decreased cellular proliferation, increased proinflammatory cytokines, and mitochondrial dynamic impairment. These cardiometabolic modifications were accompanied by reduced c-kit+ and Sca-1+ cardiac progenitor cell (CPC) populations and impaired CPC differentiation into new cardiomyocytes.
Conclusions: In conclusion, Obese mother-offspring developed cardiometabolic changes in adulthood that negatively impacted the CPC niches and, consequently, the formation of new cardiomyocytes. This process seems to be an essential mechanism involved in the pathophysiology of the disease, impairing cardiac homeostasis.
Background and aims: Excess adiposity correlate to cardiovascular diseases, inflammation, and telomere shortening, while the latter two are associated with cardiovascular risks. Whether inflammation and telomere length mediate the excess adiposity-cardiovascular relationship is unclear.
Methods and results: We performed a two-step Mendelian randomization analysis utilizing data from the latest genome-wide association studies: body mass index (BMI, n = 681,275), waist-to-hip ratio (WHR, n = 697,734) and BMI adjusted WHR (WHRadjBMI, n = 694,649), telomere length (n = 472,174), C-reactive protein (n = 204,402), interleukin-6 and interleukin-1 receptor antagonist (n = 21,758), tumor necrosis factor-α (n = 3454), hypertension (n = 463,010), coronary artery disease (n = 547,261), heart failure (n = 977,323), stroke (n = 446,696), ischemic stroke (n = 440,328), intracerebral hemorrhage (n = 343,663), aortic aneurysm (n = 356,934), transient ischemic attack (n = 360,692), peripheral vascular disease (n = 463,010), systolic and diastolic blood pressure changes (n = 757,601). We observed casual effects of excess adiposity on eight cardiovascular diseases, hypertension and blood pressure changes. Telomere length is causally associated with hypertension, blood pressure, coronary artery disease, aortic aneurysm, and intracerebral hemorrhage, mediates BMI's effect on coronary artery disease (2.41 %) and aortic aneurysm (4.97 %), and plays a suppressive role between WHR and systolic blood pressure changes (2.39 %).
Conclusion: Telomere length mediates the causal effects of excess adiposity on the risks of coronary artery disease, aortic aneurysm, and systolic blood pressure changes.
Background and aims: Previous studies have shown that frailty and metabolic syndrome (Mets) share common pathophysiological mechanisms. However, whether the observed association reflects causality requires clarification. We performed a bidirectional Mendelian randomization study to investigate the causal relationship between frailty, Mets, and their individual components.
Methods and results: Summary-level data from GWAS to identify genetic variants associated with frailty, Mets, and its components among individuals of European ancestry. Inverse variance weighting was utilized as the main method. Using bidirectional Mendelian randomization analysis, we found that the risk of frailty was causally associated with an increased risk of MetS (OR: 2.092, 95%CI: 1.564-2.799) and its components, including waist circumference (OR: 1.349, 95 % CI: 1.181-1.541), hypertension (OR: 1.099, 95 % CI: 1.075-1.125), triglycerides (OR: 1.297, 95 % CI: 1.179-1.428). Conversely, the risk of MetS was causally associated with an increased risk of frailty (OR: 1.048; 95 % CI: 1.024-1.073). however, when removing SNPs assocaited with BMI at the loci significance level and performed MVMR, Mets and frailty were not associated.
Conclusion: These findings suggest a bidirectional causal relationship between frailty and MetS, indicating that genetic factors contributing to frailty also increase the risk of MetS and its components, and vice versa. Furthermore, BMI-related SNPs may act as effect modifiers in the association between MetS and frailty. These insights into the shared pathophysiology of frailty and MetS have implications for the prevention and treatment strategies in elderly individuals with MetS.