Mechanism Underlying the Protective Effect of Glycine in Energetic Disturbances in Brain Tissues under Hypoxic Conditions

Glycine stabilizes energetics of brain mitochondria under conditions of brain hypoxia in vivo modeled by ligation of the common carotid artery in rats. Hypoxia reduced respiratory control in brain cortex mitochondria from 7.7 ± 0.5 to 4.5 ± 0.3. Preliminary oral administration of glycine almost completely prevented this decrease. In both in vitro models of hypoxia, similar phosphorylation disturbances were detected in both cortical slices and isolated brain mitochondria; they were effectively prevented by glycine. Hypoxia activates H₂O₂ generation in mitochondrial suspension. The process is signifi cantly reduced in the presence of 5 mM glycine. It is concluded that both in the model of hypoxia in vivo and during in vitro modeling of hypoxia in cortical slices and mitochondria, glycine acts as a protector inhibiting generation of reactive oxygen species in mitochondria and preventing energetics disturbances in brain mitochondria.     

Narrowed TCR repertoire and viral escape as a consequence of heterologous immunity

Why some virus-specific CD8 TCR repertoires are diverse and others restricted or "oligoclonal" has been unknown. We show here that oligoclonality and extreme clonal dominance can be a consequence of T cell cross-reactivity. Lymphocytic choriomeningitis virus (LCMV) and Pichinde virus (PV) encode NP(205-212) epitopes that induce different but highly cross-reactive diverse TCR repertoires. Homologous viral challenge of immune mice only slightly skewed the repertoire and enriched for predictable TCR motifs. However, heterologous viral challenge resulted in a narrow oligoclonal repertoire with dominant clones with unpredictable TCR sequences. This shift in clonal dominance varied with the private, i.e., unique, specificity of the host's TCR repertoire and was simulated using affinity-based computer models. The skewing differences in TCR repertoire following homologous versus heterologous challenge were observed within the same private immune system in mice adoptively reconstituted with memory CD8 T cell pools from the same donor. Conditions driving oligoclonality resulted in an LCMV epitope escape variant in vivo resembling the natural Lassa virus sequence. Thus, T cell oligoclonality, including extremes in clonal dominance, may be a consequence of heterologous immunity and lead to viral escape. This has implications for the design of peptide-based vaccines, which might unintentionally prime for skewed TCR responses to cross-reactive epitopes.     

Prevalence of life-threatening arrhythmias in ED patients transported to the radiology suite while monitored by telemetry

OBJECTIVE: The aim of this study was to determine the prevalence of life-threatening arrhythmias in monitored ED patients while in the radiology suite. METHODS: This is a retrospective analysis at a tertiary care hospital with an ED census of 52,000 visits. The patient population consisted of 3,051 adult ED patients with a chief complaint of chest pain, who were monitored with telemetry while they were sent to the radiology suite, and who were ultimately admitted to the hospital. RESULTS: Of a total of 3,051 consecutive patients with a cardiac presentation who received a nonportable chest x-ray, no patients were found to have incurred a life-threatening arrhythmia while in the radiology suite. CONCLUSION: The prevalence of a cardiac arrhythmia occurring during transport or while within the radiology suite in our study was zero. We conclude that stable patients can probably be transported to radiology safely without the use of bedside telemetry.     

Fibre intake among the Belgian population by sex-age and sex-education groups and its association with BMI and waist circumference

The objectives of the present study were to assess total dietary fibre intake and the main contributors to fibre intake in the Belgian population by sex-age and sex-education groups and to investigate its relationship with BMI and waist circumference (WC). The participants of the Belgian food consumption survey (2004) were randomly selected. Information about food intake was collected using two repeated, non-consecutive 24 h recall interviews. A total of 3083 individuals ( ≥ 15 years; 1546 men and 1537 women) completed both interviews. The main contributors to total fibre intake (17·8 g/d) were cereals and cereal products (34 %; 5·9 g/d), potatoes and other tubers (18·6 %; 3·3 g/d), fruits (14·7 %; 2·8 g/d) and vegetables (14·4 %; 2·6 g/d). Legume fibre intake was extremely low (0·672 %; 0·139 g/d). In all sex-age and sex-education groups, total fibre intake was below the recommendations of the Belgian Superior Health Council. Men (21 g/d) consumed significantly more fibre than women (17·3 g/d) (P < 0·001). Lower educated men and higher educated women reported the highest fibre intake. A significant inverse association was found between total fibre intake and WC (β = - 0·118, P < 0·001). Fruit-derived fibre was positively associated with WC (β = 0·731, P = 0·001). In summary, total fibre intake was inversely associated with WC, whereas fruit-derived fibre intake was positively associated with WC in the Belgian population.     

Plant and animal protein intake and its association with overweight and obesity among the Belgian population

The objective of the present study was to assess animal and plant protein intakes in the Belgian population and to examine their relationship with overweight and obesity (OB). The subjects participated in the Belgian National Food Consumption Survey conducted in 2004. Food consumption was assessed by using two non-consecutive 24?h dietary recalls. About 3083 participants (?≥?15 years of age; 1546 males, 1537 females) provided completed dietary information. Animal protein intake (47?g/d) contributed more to total protein intakes of 72?g/d than plant protein intake, which accounted for 25?g/d. Meat and meat products were the main contributors to total animal protein intakes (53?%), whereas cereals and cereal products contributed most to plant protein intake (54?%). Males had higher animal and plant protein intakes than females (P?相似文献   

Work-related violence against security guards--who is most at risk?

Studies on violence in the work of security guards are largely lacking. This study is unique in that it focuses on security guards (n=1,010) in Finland, and assesses the different forms, prevalence, and risk factors of the work-related violence they often face. Information to a survey instrument was obtained by first interviewing 30 volunteers. Then we made a cross-sectional mailed survey that was sent to a randomized group of 2,000 security guards. The response rate was 52. We found the prevalence of verbal aggression, threats of assault, and physical acts against security guards at least once a month to be 39%, 19%, and 15% respectively. As regards risk factors and who is most at risk, our results show that male gender, young age, low work experience, late working hours, and time pressure were associated with all three forms of work-related violence. Unlike other forms of violence, verbal aggression was highly prevalent outside the metropolitan area and directed towards both more and less experienced security guards. In prevention policies for violence, it is important to identify high-risk groups such as those who have less work experience.     

Barriers and facilitators for the implementation of the integrated public policy for alcohol,drug, tobacco,and gambling prevention: a qualitative study

Abstract

In the field of alcohol, drug, tobacco, and gambling studies, empirical research on the barriers and facilitators for public prevention policies has been scarce. Public policy studies show that the implementers of different organizational positions impact on policy implementation. In this paper, the barriers and facilitators for the implementation of an integrated national policy for addiction prevention, as seen from the positions of managers, prevention specialists, and frontline workers, are analyzed on the basis of qualitative interview data. The results indicate that the managers were structurally oriented in their thinking and emphasized local structures as facilitators. All the groups saw prevention as underfunded and undervalued. The specialists were most focused on the official structures and regarded the functioning of the structures as a key facilitator. The frontline workers underlined that their position was a facilitator in itself, offering a unique viewpoint to the localities and to the lives of their clients. A key finding is also the normalcy of gambling that both the specialist and frontline workers regarded as a major barrier. The results show that studying the policy implementation context is important: it makes it possible to understand social and cultural factors that can function as barriers or facilitators.     

Substance P-containing sensory nerves in the rat iris. Normal distribution, ontogeny and innervation of intraocular iris grafts

Trigeminal, substance P-containing nerves have been studied in the stretch-prepared rat iris with immunohistochemical techniques. The normal iris exhibited a slightly irregular plexus of individual fibres in the dilator, intermingled with thin, meandering axon bundles. The sphincter contained more circumferentially oriented fibres. Occasional free nerve endings were present in all parts of the iris; no obvious association with blood vessels was detected. All substance P-positive nerves in the iris disappeared after lesioning the trigeminal nerve. Irides of neonates showed scattered, smooth fibres in a sparse plexus, without visible axon bundles. Over the first two postnatal weeks, the density of innervation developed rapidly, reaching a transiently supranormal level and fluorescence intensity, compared to adulthood. From 3 weeks on, the pattern and density of substance P-containing fibres approached the normal adult appearance. In irides grafted to the anterior eye chamber, the intrinsic substance P nerves degenerated, disappearing completely after 5 days. Reinnervation from the host irides transpired over the next few weeks, approximating normal density after 3 weeks, and organotypic density and distribution from 4 weeks on. No obvious hyperinnervation was encountered after longer postoperative times (3 months). In the host iris, many substance P fibres disappear or exhibit low fluorescence intensity during the first postoperative week, recovering fully during the next 2 weeks. Over longer postoperative periods irregular, moderate hyperinnervation developed with increased numbers of axons in bundles. In conclusion, we show normal distribution and plasticity during ontogeny and maturity of substance P-containing iris nerves in the rat, with a sensitive immunohistochemical technique in iris whole mounts.