468 research outputs found

    Helicobacter pylori Usurps Cell Polarity to Turn the Cell Surface into a Replicative Niche

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    Helicobacter pylori (Hp) intimately interacts with the gastric epithelial surface and translocates the virulence factor CagA into host cells in a contact-dependent manner. To study how Hp benefits from interacting with the cell surface, we developed live-cell microscopy methods to follow the fate of individual bacteria on the cell surface and find that Hp is able to replicate and form microcolonies directly over the intercellular junctions. On polarized epithelia, Hp is able to grow directly on the apical cell surface in conditions that do not support the growth of free-swimming bacteria. In contrast, mutants in CagA delivery are defective in colonization of the apical cell surface. Hp perturbs the polarized epithelium in a highly localized manner, since wild-type Hp does not rescue the growth defect of the CagA-deficient mutants upon co-infection. CagA's ability to disrupt host cell polarity is a key factor in enabling colonization of the apical cell surface by Hp, as disruption of the atypical protein kinase C/Par1b polarity pathway leads to rescue of the mutant growth defect during apical infection, and CagA-deficient mutants are able to colonize the polarized epithelium when given access to the basolateral cell surface. Our study establishes the cell surface as a replicative niche and the importance of CagA and its effects on host cell polarity for this purpose

    How to Share Prosocial Behavior without Being Considered a Braggart?

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    When people share their prosocial behavior on social media, they always face the braggart’s dilemma. By sharing their good deeds, they run the risk of being considered braggarts and thus less likable; by staying silent, they receive no credit for what they do. This study proposes a framing strategy to alleviate this concern. By acknowledging a third party involved in the prosocial activity (e.g., organizer or sponsor), one will be perceived as more likable through reducing the suspicion of self-promoting and perceived to have put in more effort. An empirical study based on Twitter data was conducted to confirm our prediction. An experimental study follows to verify the mechanism. The findings provide implications for various stakeholders that take part in prosocial activities

    The role of physiological and subjective measures of emotion regulation in predicting adolescent wellbeing

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    Emotion regulation (ER) is a key contributor to psychosocial adjustment in adolescence, while ER deficits contribute to psychological distress and dysfunction. To date, research with adolescents has examined a limited subset of ER processes, often in relation to mental ill-health. This study examined associations between multiple ER measures and wellbeing in a normative sample of 119 adolescents (Mage = 15.73). ER was measured using self-report and physiological (RSA) indices. Multiple measures of positive and negative functioning were examined. After controlling for covariates, hierarchical regression analyses revealed that self-reported ER predicted resilience, perseverance, connectedness, and happiness; and fewer depression and anxiety symptoms. Higher tonic RSA predicted resilience and perseverance. Effect sizes were small to moderate. Theoretical and practical implications are discussed

    Interventions for treating urinary incontinence after stroke in adults

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    Background Urinary incontinence can affect 40% to 60% of people admitted to hospital after a stroke, with 25% still having problems when discharged from hospital and 15% remaining incontinent after one year. This is an update of a review published in 2005 and updated in 2008. Objectives To assess the effects of interventions for treating urinary incontinence after stroke in adults at least one‐month post‐stroke. Search methods We searched the Cochrane Incontinence and Cochrane Stroke Specialised Registers (searched 30 October 2017 and 1 November 2017 respectively), which contain trials identified from the Cochrane Central Register of Controlled Trials (CENTRAL), MEDLINE, MEDLINE In‐Process, MEDLINE Epub Ahead of Print, CINAHL, ClinicalTrials.gov, WHO ICTRP and handsearched journals and conference proceedings. Selection criteria We included randomised or quasi‐randomised controlled trials. Data collection and analysis Two review authors independently undertook data extraction, risk of bias assessment and implemented GRADE. Main results We included 20 trials (reporting 21 comparisons) with 1338 participants. Data for prespecified outcomes were not available except where reported below. Intervention versus no intervention/usual care Behavioural interventions: Low‐quality evidence suggests behavioural interventions may reduce the mean number of incontinent episodes in 24 hours (mean difference (MD) –1.00, 95% confidence interval (CI) –2.74 to 0.74; 1 trial; 18 participants; P = 0.26). Further, low‐quality evidence from two trials suggests that behavioural interventions may make little or no difference to quality of life (SMD ‐0.99, 95% CI ‐2.83 to 0.86; 55 participants). Specialised professional input interventions: One trial of moderate‐quality suggested structured assessment and management by continence nurse practitioners probably made little or no difference to the number of people continent three months after treatment (risk ratio (RR) 1.28, 95% CI 0.81 to 2.02; 121 participants; equivalent to an increase from 354 to 453 per 1000, 95% CI 287 to 715). Complementary therapy: Five trials assessed complementary therapy using traditional acupuncture, electroacupuncture and ginger‐salt‐partitioned moxibustion plus routine acupuncture. Low‐quality evidence from five trials suggested that complementary therapy may increase the number of participants continent after treatment; participants in the treatment group were three times more likely to be continent (RR 2.82, 95% CI 1.57 to 5.07; 524 participants; equivalent to an increase from 193 to 544 per 1000, 95% CI 303 to 978). Adverse events were reported narratively in one study of electroacupuncture, reporting on bruising and postacupuncture abdominal pain in the intervention group. Physical therapy: Two trials reporting three comparisons suggest that physical therapy using transcutaneous electrical nerve stimulation (TENS) may reduce the mean number of incontinent episodes in 24 hours (MD –4.76, 95% CI –8.10 to –1.41; 142 participants; low‐quality evidence). One trial of TENS reporting two comparisons found that the intervention probably improves overall functional ability (MD 8.97, 95% CI 1.27 to 16.68; 81 participants; moderate‐quality evidence). Intervention versus placebo Physical therapy: One trial of physical therapy suggests TPTNS may make little or no difference to the number of participants continent after treatment (RR 0.75, 95% CI 0.19 to 3.04; 54 participants) or number of incontinent episodes (MD –1.10, 95% CI –3.99 to 1.79; 39 participants). One trial suggested improvement in the TPTNS group at 26‐weeks (OR 0.04, 95% CI 0.004 to 0.41) but there was no evidence of a difference in perceived bladder condition at six weeks (OR 2.33, 95% CI 0.63 to 8.65) or 12 weeks (OR 1.22, 95% CI 0.29 to 5.17). Data from one trial provided no evidence that TPTNS made a difference to quality of life measured with the ICIQLUTSqol (MD 3.90, 95% CI –4.25 to 12.05; 30 participants). Minor adverse events, such as minor skin irritation and ankle cramping, were reported in one study. Pharmacotherapy interventions: There was no evidence from one study that oestrogen therapy made a difference to the mean number of incontinent episodes per week in mild incontinence (paired samples, MD –1.71, 95% CI –3.51 to 0.09) or severe incontinence (paired samples, MD –6.40, 95% CI –9.47 to –3.33). One study reported no adverse events. Specific intervention versus another intervention Behavioural interventions: One trial comparing a behavioural intervention (timed voiding) with a pharmacotherapy intervention (oxybutynin) contained no useable data. Complementary therapy: One trial comparing different acupuncture needles and depth of needle insertion to assess the effect on incontinence reported that, after four courses of treatment, 78.1% participants in the elongated needle group had no incontinent episodes versus 40% in the filiform needle group (57 participants). This trial was assessed as unclear or high for all types of bias apart from incomplete outcome data. Combined intervention versus single intervention One trial compared a combined intervention (sensory motor biofeedback plus timed prompted voiding) against a single intervention (timed voiding). The combined intervention may make little or no difference to the number of participants continent after treatment (RR 0.55, 95% CI 0.06 to 5.21; 23 participants; equivalent to a decrease from 167 to 92 per 1000, 95% CI 10 to 868) or to the number of incontinent episodes (MD 2.20, 95% CI 0.12 to 4.28; 23 participants). Specific intervention versus attention control Physical therapy interventions: One study found TPTNS may make little or no difference to the number of participants continent after treatment compared to an attention control group undertaking stretching exercises (RR 1.33, 95% CI 0.38 to 4.72; 24 participants; equivalent to an increase from 250 to 333 per 1000, 95% CI 95 to 1000). Authors' conclusions There is insufficient evidence to guide continence care of adults in the rehabilitative phase after stroke. As few trials tested the same intervention, conclusions are drawn from few, usually small, trials. CIs were wide, making it difficult to ascertain if there were clinically important differences. Only four trials had adequate allocation concealment and many were limited by poor reporting, making it impossible to judge the extent to which they were prone to bias. More appropriately powered, multicentre trials of interventions are required to provide robust evidence for interventions to improve urinary incontinence after stroke

    The past, current and future epidemiological dynamic of SARS-CoV-2

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    SARS-CoV-2, the agent of the COVID-19 pandemic, emerged in late 2019 in China, and rapidly spread throughout the world to reach all continents. As the virus expanded in its novel human host, viral lineages diversified through the accumulation of around two mutations a month on average. Different viral lineages have replaced each other since the start of the pandemic, with the most successful Alpha, Delta and Omicron variants of concern (VoCs) sequentially sweeping through the world to reach high global prevalence. Neither Alpha nor Delta was characterized by strong immune escape, with their success coming mainly from their higher transmissibility. Omicron is far more prone to immune evasion and spread primarily due to its increased ability to (re-)infect hosts with prior immunity. As host immunity reaches high levels globally through vaccination and prior infection, the epidemic is expected to transition from a pandemic regime to an endemic one where seasonality and waning host immunization are anticipated to become the primary forces shaping future SARS-CoV-2 lineage dynamics. In this review, we consider a body of evidence on the origins, host tropism, epidemiology, genomic and immunogenetic evolution of SARS-CoV-2 including an assessment of other coronaviruses infecting humans. Considering what is known so far, we conclude by delineating scenarios for the future dynamic of SARS-CoV-2, ranging from the good—circulation of a fifth endemic ‘common cold’ coronavirus of potentially low virulence, the bad—a situation roughly comparable with seasonal flu, and the ugly—extensive diversification into serotypes with long-term high-level endemicity
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