RESUMO
Sleep deprivation (SD) is a global public health burden, and has a detrimental role in the nervous system. Retina is an important part of the central nervous system; however, whether SD affects retinal structures and functions remains largely unknown. Herein, chronic SD mouse model indicated that loss of sleep for 4 months could result in reductions in the visual functions, but without obvious morphologic changes of the retina. Ultrastructural analysis by transmission electron microscope revealed the deterioration of mitochondria, which was accompanied with the decrease of multiple mitochondrial proteins in the retina. Mechanistically, oxidative stress was provoked by chronic SD, which could be ameliorated after rest, and thus restore retinal homeostasis. Moreover, the supplementation of two antioxidants, α-lipoic acid and N-acetyl-l-cysteine, could reduce retinal reactive oxygen species, repair damaged mitochondria, and, as a result, improve the retinal functions. Overall, this work demonstrated the essential roles of sleep in maintaining the integrity and health of the retina. More importantly, it points towards supplementation of antioxidants as an effective intervention strategy for people experiencing sleep shortages.
Assuntos
Privação do Sono , Ácido Tióctico , Humanos , Camundongos , Animais , Privação do Sono/complicações , Privação do Sono/metabolismo , Estresse Oxidativo/fisiologia , Antioxidantes/farmacologia , Retina/metabolismo , Ácido Tióctico/farmacologia , Ácido Tióctico/metabolismoRESUMO
News coverage of the human papillomavirus (HPV) vaccine grew rapidly in China in 2016 when the vaccine was approved. Drawing upon framing theory, the present study analyzed the content of 491 Chinese newspaper reports on the HPV vaccine published between June 2000 and December 2018 to investigate what and how information and valence about the vaccine was relayed to the public. The results indicated that, while the Chinese media failed to provide comprehensive and accurate information about HPV and the HPV vaccine, they showed a positive evaluation of the HPV vaccine demand and market. In addition, there was a decline in negative coverage after the vaccine was approved. This study extended the literature on HPV vaccine coverage by combining issue-specific framing and valence framing, considering the Chinese-specific vaccine market for presentation and the value of such products, which is rare in previous studies. Practical implications of the findings for health promotion were also discussed.
RESUMO
Numerous observational studies have suggested a potential causal relationship between skipping breakfast and cardiovascular diseases, including heart failure (HF). However, these studies are susceptible to inherent confounders and the challenge of reverse causation, and the underlying metabolic factors are not yet clear. Therefore, our aim is to assess the causal impact of breakfast skipping on HF and the role of potential mediating metabolic products from a genetic perspective, by conducting Mendelian Randomization (MR) studies and mediation analysis. We leveraged summary data from the most extensive genome-wide association studies to date on breakfast skipping (with 193,860 participants), blood metabolites (with 118,461 participants), and HF (involving 47,309 cases and 930,014 controls). To explore the causal relationship between breakfast skipping and HF, as well as the role of 249 potential blood metabolite mediators, we conducted bidirectional MR and mediation MR analyses. We primarily employed the Inverse Variance Weighted (IVW) method, complemented by various other techniques to ensure the comprehensiveness and reliability of our analysis. Our research confirms a causal association between breakfast skipping and an increased risk of HF (odds ratio [OR]: 1.378, 95% confidence interval [CI]: 1.047-1.813; p = 0.022). Furthermore, our research findings demonstrate that breakfast skipping is positively correlated with 6 blood metabolites and negatively correlated with 2 others. Notably, our mediation MR analysis further reveals that three blood metabolites act as mediators in the relationship between breakfast skipping and the risk of HF. Specifically, the mediating effects are attributed to the ratio of docosahexaenoic acid (DHA) to total fatty acids (proportion mediated = 9.41%, 95% CI: 2.10-28.61%), glucose (proportion mediated = 6.17%, 95% CI: 0.97-28.53%), and glycoprotein acetyls (GlycA) (proportion mediated = 5.68%, 95% CI: 0.94-21.62%). The combined mediating effects of these three factors total 20.53% (95%CI: 8.59-91.06%). Our research confirms the causal relationship between genetically instrumented breakfast skipping and HF, underscoring the potential mediating roles played by three key blood metabolites: ratio of DHA to total fatty acids, glucose and GlycA. This discovery offers valuable perspectives for clinical strategies targeting HF.
Assuntos
Desjejum , Estudo de Associação Genômica Ampla , Insuficiência Cardíaca , Jejum Intermitente , Análise da Randomização Mendeliana , Humanos , Insuficiência Cardíaca/sangue , Insuficiência Cardíaca/genética , Jejum Intermitente/efeitos adversos , Jejum Intermitente/sangue , Fatores de RiscoRESUMO
While observational studies suggest a connection between skipping breakfast and myocardial infarction (MI), the causal nature of this relationship is unclear. This study aims to investigate the genetic causal relationships between breakfast skipping and MI through Mendelian randomization (MR). Employing genetic data from a public genome-wide association study, this research focuses on genetic variations linked to breakfast skipping and MI. The primary analytical method was the inverse variance-weighted approach, complemented by additional methods like MR-Egger, weighted median, and mode analyses. It also includes heterogeneity and horizontal pleiotropy tests such as the Cochrane Q test, MR-Egger intercept, and MR-PRESSO tests, with a leave-one-out analysis for enhanced sensitivity assessment reliability. The study discovered a notable association between breakfast skipping and an increased risk of MI (odds ratios: 1.34, 95% confidence intervals: 1.03-1.76, Pâ =â .027). The test revealed no heterogeneity or multiplicity, and the sensitivity analysis confirmed the robustness of the results. Our MR analysis suggests that habitual breakfast skipping might elevate the likelihood of MI, underlining the importance of regular breakfast consumption in potentially mitigating heart attack risks.
Assuntos
Desjejum , Estudo de Associação Genômica Ampla , Análise da Randomização Mendeliana , Infarto do Miocárdio , Humanos , Infarto do Miocárdio/genética , Infarto do Miocárdio/epidemiologia , Comportamento Alimentar/fisiologia , Polimorfismo de Nucleotídeo Único , Fatores de Risco , Jejum IntermitenteRESUMO
Meibomian gland dysfunction (MGD) is a chronic abnormality of the Meibomian glands (MGs) that is recognized as the leading cause of evaporative dry eye worldwide. Despite its prevalence, however, the pathophysiology of MGD remains elusive, and effective disease management continues to be a challenge. In the past 50 years, different models have been developed to illustrate the pathophysiological nature of MGD and the underlying disease mechanisms. An understanding of these models is crucial if researchers are to select an appropriate model to address specific questions related to MGD and to develop new treatments. Here, we summarize the various models of MGD, discuss their applications and limitations, and provide perspectives for future studies in the field.