Distinct Regulation of EZH2 and its Repressive H3K27me3 Mark in Polyomavirus-Positive and -Negative Merkel Cell Carcinoma

Merkel cell carcinoma (MCC) is an aggressive skin cancer for which Merkel cell polyomavirus integration and expression of viral oncogenes small T and Large T have been identified as major oncogenic determinants. Recently, a component of the PRC2 complex, the histone methyltransferase enhancer of zeste homolog 2 (EZH2) that induces H3K27 trimethylation as a repressive mark has been proposed as a potential therapeutic target in MCC. Because divergent results have been reported for the levels of EZH2 and trimethylation of lysine 27 on histone 3, we analyzed these factors in a large MCC cohort to identify the molecular determinants of EZH2 activity in MCC and to establish MCC cell lines' sensitivity to EZH2 inhibitors. Immunohistochemical expression of EZH2 was observed in 92% of MCC tumors (156 of 170), with higher expression levels in virus-positive than virus-negative tumors (P = 0.026). For the latter, we showed overexpression of EZHIP, a negative regulator of the PRC2 complex. In vitro, ectopic expression of the large T antigen in fibroblasts led to the induction of EZH2 expression, whereas the knockdown of T antigens in MCC cell lines resulted in decreased EZH2 expression. EZH2 inhibition led to selective cytotoxicity on virus-positive MCC cell lines. This study highlights the distinct mechanisms of EZH2 induction between virus-negative and -positive MCC.

The Role of Histone Post-Translational Modifications in Merkel Cell Carcinoma

Merkel Cell Carcinoma (MCC) is a rare but highly aggressive form of non–melanoma skin cancer whose 5-year survival rate is 63%. Merkel cell polyomavirus (MCPyV), a small DNA tumor virus, is the etiological agent of MCC. Although representing a small proportion of MCC cases, MCPyV-negative MCCs have also been identified. The role of epigenetic mechanisms, including histone post-translational modifications (PTMs) in MCC, have been only partially determined. This review aims to describe the most recent progress on PTMs and their regulative factors in the context of MCC onset/development, providing an overview of current findings on both MCC subtypes. An outline of current knowledge on the potential employment of PTMs and related factors as diagnostic and prognostic markers, as well as novel treatment strategies targeting the reversibility of PTMs for MCC therapy is provided. Recent research shows that PTMs are emerging as important epigenetic players involved in MCC onset/development, and therefore may show a potential clinical significance. Deeper and integrated knowledge of currently known PTM dysregulations is of paramount importance in order to understand the molecular basis of MCC and improve the diagnosis, prognosis, and therapeutic options for this deadly tumor.

Community Alcohol Partnerships with the alcohol industry: what is their purpose and are they effective in reducing alcohol harms?

Background

Local initiatives to reduce alcohol harms are common. One UK approach, Community Alcohol Partnerships (CAPs), involves partnerships between the alcohol industry and local government, focussing on alcohol misuse and anti-social behaviour (ASB) among young people. This study aimed to assess the evidence of effectiveness of CAPs.

Methods

We searched CAP websites and documents, and databases, and contacted CAPs to identify evaluations and summarize their findings. We appraised these against four methodological criteria: (i) reporting of pre-post data; (ii) use of comparison area(s); (iii) length of follow-up; and (iv) baseline comparability of comparison and intervention areas.

Results

Out of 88 CAPs, we found three CAP evaluations which used controlled designs or comparison areas, and further data on 10 other CAPs. The most robust evaluations found little change in ASB, though few data were presented. While CAPs appear to affect public perceptions of ASB, this is not a measure of the effectiveness of CAPs.

Conclusions

Despite industry claims, the few existing evaluations do not provide convincing evidence that CAPs are effective in reducing alcohol harms or ASB. Their main role may be as an alcohol industry corporate social responsibility measure which is intended to limit the reputational damage associated with alcohol-related ASB.

An evaluation of a public-private partnership to reduce artificial trans fatty acids in England, 2011-16

Background

The Public Health Responsibility Deal (RD) is a public-private partnership in England involving voluntary pledges between government, and business and other public organizations to improve public health. One such voluntary pledge refers to the reduction of trans fatty acids (TFAs) in the food supply in England by either pledging not to use artificial TFAs or pledging artificial TFA removal. This paper evaluates the RD's effectiveness at encouraging signatory organizations to remove artificially produced TFAs from their products.

Methods

We analysed publically available data submitted by RD signatory organizations. We analysed their plans and progress towards achieving the TFAs pledge, comparing 2015 progress reports against their delivery plans. We also assessed the extent to which TFAs reductions beyond pre-2011 levels could be attributed to the RD.

Results

Voluntary reformulation via the RD has had limited added value, because the first part of the trans fat pledge simply requires organizations to confirm that they do not use TFAs and the second part, that has the potential to reduce use, has failed to attract the participation of food producers, particularly those producing fast foods and takeaways, where most remaining use of artificial TFAs is located.

Conclusions

The contribution of the RD TFAs pledges in reducing artificial TFAs from England's food supply beyond pre-2011 levels appears to be negligible. This research has wider implications for the growing international evidence base voluntary food policy, and offers insights for other countries currently undertaking work to remove TFAs from their food supply.

Getting England to be more physically active: are the Public Health Responsibility Deal's physical activity pledges the answer?

BACKGROUND

The Public Health Responsibility Deal (RD) in England is a public-private partnership involving voluntary pledges between government, industry, and other organisations to improve public health by addressing alcohol, food, health at work, and physical activity. This paper analyses the RD physical activity (PA) pledges in terms of the evidence of their potential effectiveness, and the likelihood that they have motivated actions among organisations that would not otherwise have taken place.

METHODS

We systematically reviewed evidence of the effectiveness of interventions proposed in four PA pledges of the RD, namely, those on physical activity in the community; physical activity guidelines; active travel; and physical activity in the workplace. We then analysed publically available data on RD signatory organisations' plans and progress towards achieving the physical activity pledges, and assessed the extent to which activities among organisations could be attributed to the RD.

RESULTS

Where combined with environmental approaches, interventions such as mass media campaigns to communicate the benefits of physical activity, active travel in children and adults, and workplace-related interventions could in principle be effective, if fully implemented. However, most activities proposed by each PA pledge involved providing information or enabling choice, which has limited effectiveness. Moreover, it was difficult to establish the extent of implementation of pledges within organisations, given that progress reports were mostly unavailable, and, where provided, it was difficult to ascertain their relevance to the RD pledges. Finally, 15 % of interventions listed in organisations' delivery plans were judged to be the result of participation in the RD, meaning that most actions taken by organisations were likely already under way, regardless of the RD.

CONCLUSIONS

Irrespective of the nature of a public health policy to encourage physical activity, targets need to be evidence-based, well-defined, measurable and encourage organisations to go beyond business as usual. RD physical activity targets do not adequately fulfill these criteria.

Scald risk in social housing can be reduced through thermostatic control system without increasing Legionella risk: a cluster randomised trial

OBJECTIVE

To quantify the effects of a thermostatic control system in social (public) housing on the prevalence of dangerous (>60°C) water temperatures and on fuel consumption.

DESIGN

Pair-matched double-blind cluster randomised controlled trial.

SETTING

Social housing in a deprived inner-London borough.

PARTICIPANTS

150 households recruited as clusters from 22 social housing estates. Four small estates were combined into two clusters (resulting in a total of 10 pairs of clusters).

INTERVENTION

Social housing estate boiler houses were randomised to a thermostatic control sterilisation programme (heating water to 65°C during 00:00-06:00 h and to 50°C from 06:00 to 00:00 h daily) or to standard control (constant temperature 65°C).

MAIN OUTCOME MEASURES

Water temperature over 60°C ('dangerous') after running taps for 1 min and daily fuel consumption (cubic feet of gas).

RESULTS

10 clusters (80 households) were allocated to the sterilisation programme and 10 clusters (70 households) to control, of which 73 and 67 households, respectively, were analysed. Prevalence of dangerous (>60°C) hot water temperatures at 1 min was significantly reduced with the sterilisation programme (mean of cluster prevalence 1% in sterilisation programme group vs 34% in control group; absolute difference 33%, 95% CI 12% to 54%; p=0.006). Prevalence of high (>55°C) hot water temperatures at 1 min was significantly reduced (31% sterilisation vs 59% control; absolute difference 28%, 95% CI 9% to 47%; p=0.009). Gas consumption per day reduced more in the control group than in the sterilisation programme group, although not statistically significantly (p=0.125).

CONCLUSIONS

The thermostatic control with daily sterilisation was effective in capping hot water temperatures and therefore reduced scald risk. Although expected to save energy, fuel consumption was increased relative to the control group. Trial registration ClinicalTrials.gov ID: NCT00874692.

Training primary health care workers about drugs: a national survey of UK trainers' perceptions towards training

Reports have consistently shown that non-specialist drug workers (whose working role is not specifically concentrated on dealing with drug-related issues) are reluctant to work with drug users. A number of explanations have been offered to account for this unwillingness including attitudinal factors, occupational constraints and a lack of motivation to learn about drug-related issues. Previously, it has been shown that training affects commitment to working with substance misusers, although failure to attract particular professional groups (e.g. general practitioners) into training courses has also been reported. No previous research has examined the views of trainers about training primary health care and health-related workers. This study of a (non-probability) sample of UK drug trainers (n = 145) assessed training activity for different health care workers, and trainers' differential perceptions of training needs and methods. GPs were the group least likely to become trained about drug issues. Training in attitudes towards drug using individuals was perceived to be more important than either skills or knowledge training for GPs, practice nurses, other nurses and probation officers. Experiential training methods were perceived to be more important than a didactic approach for training all health groups except GPs for whom lecture type instruction was believed to be equally appropriate. Seventy-nine percent of subjects reported providing training across drugs in alcohol or drugs, alcohol and tobacco. Most trainers who stated that certain professions required independent training believed that GPs should be trained separately from other groups.

General practice involvement in the management of alcohol misuse: dynamics and resistances

While there is a growing body of empirical evidence to suggest that the types of interventions which General Practitioners (GPs) could offer patients with potential or established alcohol problems are effective, there are still, in practice, many barriers to the treatment of alcohol problems in the primary care setting. These barriers are both practical and attitudinal in nature and stem from GPs, patients, the operational practices, and the ethos of the primary healthcare system itself. GPs, for example, may have difficulty arriving at a diagnosis of alcohol problems. Many believe that they have neither the skills nor the expertise required to deal with such problems. Patients are often reluctant to seek help for alcohol problems and may question the appropriateness of GP treatment. Situational barriers include the already heavy workload of the GP. Barriers such as these are reviewed and recommendations about the ways in which they might be overcome are outlined.

Simultaneous assessment of the opiate-induced modifications in the vertical and horizontal components of locomotor activity in mice

The effects of some opiates on the horizontal and vertical components of locomotor activity in mice were measured in actometers fitted with photoelectric cells counting horizontal displacements and the striding over a low partition wall. Morphine and fentanyl, used at low doses which did not modify the horizontal locomotor activity, decreased the striding over of the partition wall. Such a dissociation was not observed with either kappa or sigma agonists which affected in the same way the two components of the locomotor activity: both components were inhibited by kappa agonists and slightly stimulated by the sigma agonist SKF 10047. Although the opiate-induced inhibition of the striding over was induced by low doses of morphine, relatively high doses of naloxone were necessary for its antagonism. This apparently difficult antagonism could result in fact from the sedation which appeared when morphine was associated with naloxone.