Hyo Young Lee

Although commensalism with gut microbiota exists in all metazoans, the host factors that maintain this homeostatic relationship remain largely unknown. We show that the intestinal homeobox gene Caudal regulates the commensal-gut mutualism by repressing nuclear factor kappa B–dependent antimicrobial peptide genes. Inhibition of Caudal expression in flies via RNA interference led to overexpression of antimicrobial peptides, which in turn altered the commensal population within the intestine. In particular, the dominance of one gut microbe, Gluconobacter sp. strain EW707, eventually led to gut cell apoptosis and host mortality. However, restoration of a healthy microbiota community and normal host survival in the Caudal-RNAi flies was achieved by reintroduction of the Caudal gene. These results reveal that a specific genetic deficiency within a host can profoundly influence the gut commensal microbial community and host physiology.

AIMS: To determine the association between sleep quality and nurse productivity. BACKGROUND: Although poor sleep quality may decrease nurses' productivity, the association between the two has not yet been evaluated in the literature. METHODS: A cross-sectional survey was completed in May 2014 by 188 nurses working in acute hospitals in South Korea using the Pittsburgh Sleep Quality Index. Descriptive statistics, t tests, ANOVA, Pearson's correlation, and stepwise multiple regression were conducted for data analysis. RESULTS: The prevalence of poor sleep quality was high (79.8%). Among the components of sleep quality, sleep disturbances (β = -0.19) and subjective sleep quality (β = -0.16) were determined to be statistically significant predictive factors of nurse productivity, in addition to shift work (β = -0.20) and age (β = 0.32). CONCLUSION: Poor sleep quality may lead to lower nurse productivity. IMPLICATIONS FOR NURSING MANAGEMENT: Nurse leaders and executives should consider measures to improve nurses' sleep quality and enhance nurse productivity. Steps that need to be considered include longer intervals between shift-work cycles, clockwise scheduling order, a longer break time after night shift work, allowing nurses to nap before / during a night shift, and providing a worksite healthy sleep programme.

PURPOSE: This study explored health-related quality of life (QoL) in Korean elderly individuals with hypertension, diabetes, and/or cardiovascular disease (CVD). METHODS: This study used a population-based cross-sectional design. Data were obtained from the Fourth Korean National Health and Nutrition Examination Survey 2008, which involved a nationally representative sample. Data on health-related QoL were collected using the EuroQoL-5 Dimension instrument and via health interviews. The sample consisted of 1,467 Korean individuals aged 60 years and older. A multiple linear regression model was used to analyze health-related QoL. RESULTS: After controlling for sociodemographic and lifestyle variables, individuals with one of the aforementioned chronic diseases had lower EuroQoL-5 Dimension scores, ranging from 0.186 among those with only hypertension to 0.469 among those with hypertension plus CVD, compared with those without a chronic disease (higher scores are indicative of more limitations). The impact of comorbid diseases was greater than that of any single disease except diabetes. CVD had a stronger negative impact on QoL than did any other single disease studied. Whereas the physical elements of QoL were influenced by all diseases, the psychological components were influenced only by hypertension plus diabetes and hypertension plus CVD. CONCLUSION: We found that both the number and the type of diseases affected QoL scores. Efforts to prevent or manage diabetes, CVD, and related risk factors should include psychological support.