Schistosomes and snails: A molecular encounter

Copyright © 2014 Knight, Arican-Goktas, Ittiprasert, Odoemelam, Miller and Bridger. This is an open-access article distributed under the terms of the Creative Commons Attribution License (CC BY). The use, distribution or reproduction in other forums is permitted, provided the original author(s) or licensor are credited and that the original publication in this journal is cited, in accordance with accepted academic practice. No use, distribution or reproduction is permitted which does not comply with these terms.Copyright © 2014 Knight, Arican-Goktas, Ittiprasert, Odoemelam, Miller and Bridger. Biomphalaria glabrata snails play an integral role in the transmission of Schistosoma mansoni, the causative agent for human schistosomiasis in the Western hemisphere. For the past two decades, tremendous advances have been made in research aimed at elucidating the molecular basis of the snail/parasite interaction. The growing concern that there is no vaccine to prevent schistosomiasis and only one effective drug in existence provides the impetus to develop new control strategies based on eliminating schistosomes at the snail-stage of the life cycle. To elucidate why a given snail is not always compatible to each and every schistosome it encounters, B. glabrata that are either resistant or susceptible to a given strain of S. mansoni have been employed to track molecular mechanisms governing the snail/schistosome relationship. With such snails, genetic markers for resistance and susceptibility were identified. Additionally, differential gene expression studies have led to the identification of genes that underlie these phenotypes. Lately, the role of schistosomes in mediating non-random relocation of gene loci has been identified for the first time, making B. glabrata a model organism where chromatin regulation by changes in nuclear architecture, known as spatial epigenetics, orchestrated by a major human parasite can now be investigated. This review will highlight the progress that has been made in using molecular approaches to describe snail/schistosome compatibility issues. Uncovering the signaling networks triggered by schistosomes that provide the impulse to turn genes on and off in the snail host, thereby controlling the outcome of infection, could also yield new insights into anti-parasite mechanism(s) that operate in the human host as well.NIH-NIAID and the Malacological Society of London

Benthic foraminifera show some resilience to ocean acidification in the northern Gulf of California, Mexico.

The version on PEARL: Corrected proofs are Articles in Press that contain the authors' corrections. Final citation details, e.g., volume/issue number, publication year and page numbers, still need to be added and the text might change before final publication. Although corrected proofs do not have all bibliographic details available yet, they can already be cited using the year of online publication and the DOI , as follows: author(s), article title, journal (year), DOIExtensive CO2 vents have been discovered in the Wagner Basin, northern Gulf of California, where they create large areas with lowered seawater pH. Such areas are suitable for investigations of long-term biological effects of ocean acidification and effects of CO2 leakage from subsea carbon capture storage. Here, we show responses of benthic foraminifera to seawater pH gradients at 74-207m water depth. Living (rose Bengal stained) benthic foraminifera included Nonionella basispinata, Epistominella bradyana and Bulimina marginata. Studies on foraminifera at CO2 vents in the Mediterranean and off Papua New Guinea have shown dramatic long-term effects of acidified seawater. We found living calcareous benthic foraminifera in low pH conditions in the northern Gulf of California, although there was an impoverished species assemblage and evidence of post-mortem test dissolution

Localized and controlled delivery of nitric oxide to the conventional outflow pathway via enzyme biocatalysis: towards therapy for Glaucoma

Nitric oxide (NO) has been shown to lower intraocular pressure (IOP), however its therapeutic effects on outflow physiology are location- and dose-dependent. Here, a NO delivery platform that directly targets the resistance-generating region of the conventional outflow pathway and locally liberates a controlled dose of NO is reported. An increase in outflow facility (decrease in IOP) is demonstrated in mouse model

Up and away: ontogenic transference as a pathway for aerial dispersal of microplastics

Microplastics (MPs) are ubiquitous pollutants found in marine, freshwater and terrestrial ecosystems. With so many MPs in aquatic systems it is inevitable that they will be ingested by aquatic organisms, and be transferred up through the food chain. However, to date, no study has considered whether MPs can be transmitted by means of ontogenic transference i.e. between life stages that utilise different habitats. Here, we determine whether fluorescent polystyrene beads could transfer between Culex mosquito life stages and, particularly, could move into the flying adult stage. We show for the first time that MPs can be transferred ontogenically from a feeding (larva) into a non-feeding (pupa) life stage and subsequently into the adult terrestrial life stage. However, transference is dependent on particle size, with smaller 2 µm MPs transferring readily into pupae and adult stages, whilst 15 µm MPs transferred at a significantly reduced rate. Microplastics appear to accumulate in the Malpighian tubule renal excretion system. The transfer of MPs to the adults represents a potential aerial pathway to contamination of new environments. Thus, any organism that feeds on terrestrial life phases of freshwater insects could be impacted by MPs found in aquatic ecosystems

Pattern and outcome of paediatric medical admissions at the University of Nigeria Teaching Hospital (UNTH), Ituku-Ozalla, Enugu: a five year retrospective review (2007 – 2011)

Background: Most health information from Nigeria and other developing countries are based on hospital records which although may not be a true representative of the whole population, they serve as pointers. Such information has shown that infections and malnutrition remain the leadingcauses of morbidity and mortality , although non-communicable diseases also pose substantial threat to child health.Objective: To review the pattern, trend and outcome of paediatricadmissions at the University of Nigeria Teaching Hospital over afive year period.Methods: Patients admitted into the main pediatric wards of the hospital over a five year period were reviewed, through information obtained from their case notes. Neonates, surgical and trauma patients as well as patients admitted into the children’s emergency room were excluded.Results: Infections (44.5%) were the leading causes of hospital admissions while non-communicable diseases were the leading causes ofdeath in this study with an overall mortality rate of 9%.Conclusion: Despite all efforts over the years, infections continue to pose serious challenges to child health in developing countries. At the same time, non-communicable diseases are taking over as leading causes of mortality. Therefore, as we make stronger efforts to tackle infections and malnutrition, we should make provisions for improved diagnosis and management of non-communicable diseases.Key words: Outcome, Paediatric, medical admissions, Enugu

Coagulation profile of children with sickle cell anemia in steady state and crisis attending the university of Nigeria teaching hospital, Ituku-Ozalla, Enugu

Background: Sickle cell anemia is associated with a hypercoagulable state that may lead to alterations in a coagulation profile. Measurements of coagulation factors are known to have some predictive value for clinical outcome.Objectives: To determine the coagulation profile of children with SCA in steady state and crisis and compare it with those with normal HbAA genotype.Materials and Methods: This is a prospective observational study involving 50 children with SCA in steady state, 50 in crises, and 50 with HbAA genotype, carried out from June to October 2009. All the values of coagulation profile were matched for age and sex.Results: The mean Prothrombin time (PT) (12.5 ± 1.2 secs), Activated partial thromboplastin time (aPTT) (41.6 ± 1.0 secs), and Thrombin time (TT) (12.3 ± 1.2 secs) of subjects with SCA in steady state as well as those during crises [PT (12.6 ± 1.8 secs), aPTT (45.6 ± 1.3 secs), TT (12.5 ± 1.7 secs)] were significantly prolonged compared to those of subjects with HbAA genotype. The mean bleeding time (BT) of 3.4 ± 1.0 mins was significantly shorter in children with SCA in steady state compared to those with HbAA genotype (3.7 ± 1.1 mins), (P < 0.038).Conclusion: Coagulation profile of patients with SCA is prolonged both in steady state and during crisis and when compared to those with HbAA genotype, though all values are within normal range.Key words: Children, coagulation profile, sickle cell anemi

Antioxidant supplementation during early development reduces parasite load but does not affect sexual ornament expression in adult ring-necked pheasants Phasianus colchicus

ArticleCopyright © 2012 The Authors. Functional Ecology © 2012 British Ecological Society1. The ‘parasite-mediated sexual selection’ (PMSS) hypothesis predicts that exaggerated male ornamentation could provide a signal to females of a males ability to resist parasites. Empirical tests of the PMSS have been largely equivocal, however, which may be because most have not considered the role of early life-history effects. 2. Many sexually-selected traits are carotenoid-based. Allocation of dietary-derived carotenoids to sexual ornaments may trade-off with allocation to pro-inflammatory immune response and/or antioxidant functions, mediated by the oxidative status of individuals. Exposure to parasites can increase oxidative stress, so under this scenario sexually-selected traits indicate ability to resist oxidative stress rather than ability to resist parasites per se. Such life-history trade-offs, mediated by oxidative status of individuals, are particularly acute during growth and development. 3. Here we use ring-necked pheasants, Phasianus colchicus, a strongly sexually-selected species, to test whether supplementation with dietary antioxidants (vitamin E) can mitigate the effects of early exposure to parasites (the nematode, Heterakis gallinarum), via alteration of the oxidative status of individuals, and positively affect the expression of sexual ornaments at adulthood. 4. We found that vitamin E mediated the effect of early exposure to parasites on levels of oxidative damage at 8 weeks of age and reduced the parasite load of individuals at adulthood as predicted. However, the expression of sexual ornaments, immune function, and growth were unaffected by either early vitamin E supplementation or manipulation of parasite load. In contrast to the predictions of the PMSS hypothesis the intensity of sexual ornament expression was not related to either parasite load or oxidative status of individuals (current or long-term). Consequently there was no evidence that the expression of sexual ornaments provided information on the ability of males to resist infection from parasites.NERCRoyal Societ

Finding fault: Criticism as a care management strategy and its impact on outcomes for dementia caregivers

Peer Reviewedhttps://deepblue.lib.umich.edu/bitstream/2027.42/148350/1/gps5052_am.pdfhttps://deepblue.lib.umich.edu/bitstream/2027.42/148350/2/gps5052.pd

Prevalence of hypoxemia among children with sickle cell anemia during steady state and crises: A cross.sectional study

Background: Patients with sickle cell anemia (SCA) are prone to recurrent pain crises related to red blood cell sickling and vaso.occlusion with subsequent tissue hypoxia. Alveolar hypoxia has been shown to be associated with entrapment of sickle cells in the pulmonary microcirculation which may propagate a cycle of further hypoxemia and sickling. Pulmonarycomplications are common in sickle cell disease (SCD) and may  exacerbate microvascular occlusive phenomena. Thus, detecting hypoxemia is of particular importance in SCD.Objectives: This study was designed to determine the prevalence of hypoxemia among children with SCA and compare the oxygen saturation of those in crises with those in steady state.Materials and Methods: This is a prospective observational study involving 46 children with SCA in steady state, 42 with crises, and 42 with HbAA genotype carried out between August and December 2010. The study compared the oxygen saturation of sickle cell anaemic children in steady state and in crises with normal hemoglobin genotype using Nellcon pulse oximeter while the hemoglobin concentration was analyzed using automated Sysmex KX.21N model.Results: A total of 130 participants aged 6 months to 18 years were recruited. The overall prevalence of hypoxemia in this study was 13.8%. Hypoxemia was highest among SCA patients in the crisis state (23.8%) compared to 13% and 0% for those in the steady state and in those with normal hemoglobin genotype, respectively (ƒÔ2 = 6.425, P = 0.04).Hypoxemia was higher among those with hemoglobin less than 5 g/dl (30%) and least among those whose hemoglobin levels were 10 g/dl and above.Conclusions: Hypoxemia was significantly higher among children with SCA during Vaso-occlusion crises. We recommend that one should have a high index of suspicion and take prompt action in managing these individualsespecially those with acute chest syndrome. Key words: Enugu, hypoxemia, oxygen saturation, sickle cell anemi