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1.
Afr J Paediatr Surg ; 21(2): 85-89, 2024 Apr 01.
Article in English | MEDLINE | ID: mdl-38546244

ABSTRACT

BACKGROUND: The Ponseti technique remains the preferred method for club foot treatment. Although measures of treatment outcomes have been well documented, there is no consensus on the determinants of those outcomes. This study aims to assess treatment outcomes and the factors which can influence treatment outcomes. MATERIALS AND METHODS: This is a cross-sectional study. A total of 472 children representing 748 feet in total were recruited. Patient characteristics such as age at presentation, gender, tenotomy, walking with or without deformity, parental educational status and occupation were documented. Outcomes of care were assessed using indictors such as parents' satisfaction with the outcome of treatment and the patients' ambulation without deformity. The relationships between the determinant factors and these outcomes were explored using multivariable binary logistic regression. RESULTS: Most of the children (69.1%) were aged below 2 years. Brace compliance was very high (89.9%). The pre-treatment average Pirani scores were 3.9 ± 1.8 and 4.3 ± 1.8 for the right and left feet, respectively. Majority (88.3%) of the children achieved ambulation without deformity, whereas most (87%) of the parents were satisfied with the treatment outcomes. In total, parental satisfaction with child's treatment outcomes was lower in parents who were not formally educated odds ratio (OR) = 0.19 (95% confidence interval [CI] 0.08-0.43), but parental satisfaction was lower if the child had higher Pirani score OR = 0.77 (95% CI 0.62-0.96). Children who had more casts applied to the affected foot were more likely to walk without deformity OR = 1.24 (95% CI 1.01-1.52). CONCLUSIONS: This study revealed that treatment outcomes in children with club foot can be determined by some sociodemographic and treatment-related factors.


Subject(s)
Clubfoot , Child , Humans , Infant , Aged , Clubfoot/therapy , Cross-Sectional Studies , Casts, Surgical , Foot , Treatment Outcome
2.
Radiography (Lond) ; 30(1): 52-60, 2024 Jan.
Article in English | MEDLINE | ID: mdl-37866158

ABSTRACT

INTRODUCTION: The timely communication of clinically significant image appearances to Emergency Department (ED) referrers is necessary for optimum patient care. Australian reliance on verbal communication only is time-limited, open to misinterpretation and lacks transparency. A combined radiographer alert and comment model was designed to reliably communicate image abnormalities to ED referrers in real-time. METHODS: A multidisciplinary steering group designed the model for all ED general imaging. Protocols were developed to document radiographer comments (critical, urgent and clinically significant) in patients' medical records. Critical findings were communicated directly to ED. Five NSW hospitals varying in size, complexity and population demographics piloted the model between three to twelve months during 2021-2022. Site auditors compared comments with the radiology report and designated each as True Positive (TP), False Positive (FP), indeterminate and clinically significant. Indeterminate cases were analysed by an external radiologist. Inter-observer consensus was obtained for all classifications via two independent auditors. The Positive Predictive Value (PPV), or precision of the comment, was calculated for each site. RESULTS: Radiographers (n = 69) provided comments for 1102 cases. The pooled average PPV for TP was 0.96; (0.947-0.971; 95% CI). The weighted mean error (FP comments) was 3.9%; (2.9% - 5.3%.; 95% CI). CONCLUSION: The Radiographer Comment model provided consistent levels of commenting precision and reproducibility across a range of sites with a pooled average PPV (0.96). The False Positive rate or weighted mean error (FP) of 3.9% (2.9% - 5.3%.; 95% CI) was low. IMPLICATIONS FOR FUTURE PRACTICE: A strategic, interprofessional approach in the implementation of an image alert combined with a Radiographer Comment can be adapted across a variety of hospital settings for ED and other departments.


Subject(s)
Emergency Service, Hospital , Humans , X-Rays , Reproducibility of Results , Pilot Projects , Australia
3.
J Popul Ageing ; 15(3): 863-878, 2022.
Article in English | MEDLINE | ID: mdl-35999953

ABSTRACT

Canada is a relatively young, geographically-diverse country, with a larger proportion of the population aged over 65 than under 15. Increasing alongside the number of ageing Canadians is the number of older adults that live with mental health challenges. Across the life course, one in five Canadians will experience a mental health disorder with many more living with subclinical symptoms. For these individuals, their lived experience may be directly impacted by the contemporary laws and policies governing mental illness. Examining and reviewing the historical context of mental health and older adults, we provide insights into the evolving landscape of Canadian mental health law and policy, paternalistic roots in the infancy of the country, into modern foci on equity and diversity. Progressing in parallel to changes in mental health policy has been the advancement of mental health research, particularly through longitudinal studies of ageing. Although acting through different mechanisms, the evolution of Canadian mental health law, policy, and research has had, and continues to have, considerable impacts on the substantial proportion of Canadians living with mental health challenges.

4.
Afr J Paediatr Surg ; 19(1): 9-12, 2022.
Article in English | MEDLINE | ID: mdl-34916344

ABSTRACT

BACKGROUND: Children are prone to unintentional injuries and various scoring systems have been used to triage these injuries. The aim of this study is to determine the associations between paediatric trauma score (PTS), revised trauma score (RTS) and the length of hospital stay as an indicator of injury severity. METHODS: This is a descriptive cross-sectional study conducted in the University of Calabar Teaching Hospital, Calabar and National Orthopaedic Hospital, Enugu from February 2018 to March 2020. A structured questionnaire was used to collect personal, injury-specific and treatment-specific data. The relationship between PTS, RTS and the length of hospital stay was evaluated using the one-way analysis of variance (ANOVA). RESULTS: A total of 212 patients were included in the study. Majorities (129, 60%) of the injured children were male and most of the injuries were due to falls from height (54%). The mean PTS was 5.36 ± 1.9, while the mean RTS was 7.10 ± 0.9. The Pearson's product momentum correlation coefficient shows that there was weak but statistically significant correlation between the PTS and the RTS (r = 0.22, P = 0.02). The one-way ANOVA showed a statistically significant decrease in the RTS with increasing duration of hospital admission (F-statistic = 6.654, df = 3, P = 0.000). The PTS showed a less obvious decrease with no trend. CONCLUSION: In this study, the RTS showed an inverse relationship with the length of hospital stay.


Subject(s)
Adverse Childhood Experiences , Child , Cross-Sectional Studies , Hospitals, Teaching , Humans , Length of Stay , Male , Nigeria
5.
J Neurol ; 268(9): 3105-3115, 2021 Sep.
Article in English | MEDLINE | ID: mdl-33547527

ABSTRACT

BACKGROUND AND PURPOSE: There are very few studies of the characteristics and causes of ICH in COVID-19, yet such data are essential to guide clinicians in clinical management, including challenging anticoagulation decisions. We aimed to describe the characteristics of spontaneous symptomatic intracerebral haemorrhage (ICH) associated with COVID-19. METHODS: We systematically searched PubMed, Embase and the Cochrane Central Database for data from patients with SARS-CoV-2 detected prior to or within 7 days after symptomatic ICH. We did a pooled analysis of individual patient data, then combined data from this pooled analysis with aggregate-level data. RESULTS: We included data from 139 patients (98 with individual data and 41 with aggregate-level data). In our pooled individual data analysis, the median age (IQR) was 60 (53-67) years and 64% (95% CI 54-73.7%) were male; 79% (95% CI 70.0-86.9%) had critically severe COVID-19. The pooled prevalence of lobar ICH was 67% (95% CI 56.3-76.0%), and of multifocal ICH was 36% (95% CI 26.4-47.0%). 71% (95% CI 61.0-80.4%) of patients were treated with anticoagulation (58% (95% CI 48-67.8%) therapeutic). The median NIHSS was 28 (IQR 15-28); mortality was 54% (95% CI 43.7-64.2%). Our combined analysis of individual and aggregate data showed similar findings. The pooled incidence of ICH across 12 cohort studies of inpatients with COVID-19 (n = 63,390) was 0.38% (95% CI 0.22-0.58%). CONCLUSIONS: Our data suggest that ICH associated with COVID-19 has different characteristics compared to ICH not associated with COVID-19, including frequent lobar location and multifocality, a high rate of anticoagulation, and high mortality. These observations suggest different underlying mechanisms of ICH in COVID-19 with potential implications for clinical treatment and trials.


Subject(s)
COVID-19 , Cerebral Hemorrhage/complications , Cerebral Hemorrhage/epidemiology , Cohort Studies , Humans , Male , Middle Aged , SARS-CoV-2
8.
Sci Total Environ ; 669: 91-102, 2019 Jun 15.
Article in English | MEDLINE | ID: mdl-30878944

ABSTRACT

Emamectin benzoate is used as an in-feed treatment for the control of sea lice parasites in all of the main farmed Atlantic salmon (Salmo salar) facilities worldwide (Norway, Chile, Scotland and Canada). Investigations into its effect on non-target benthic fauna resulting from its excretion from farmed fish and uneaten feed have been limited. This paper presents the findings from a study that intended to assess the impact of emamectin benzoate on benthic fauna using a new low detection method for emamectin benzoate. Eight fish farms in the Shetland Isles, Scotland were surveyed, with sediment sampled along transects radiating from the farms analysed for benthic ecology, sediment chemistry and sediment veterinary medicine residues (analysed for emamectin benzoate and teflubenzuron). Canonical Correspondence Analysis (CCA) and Generalised Linear Mixed Modelling (GLMM) were used to assess which environmental parameters observed during the survey had the biggest effect on benthic community composition and abundance, and more specifically crustacean abundance and richness. Emamectin benzoate was found in 97% of samples, demonstrating widespread dispersion in the sediments sampled. The CCA showed that species composition was predominantly ordinated along a gradient of particle size, with a secondary axis dominated by a change in emamectin benzoate and organic carbon enrichment. Peaks in abundance of crustacean species were predicted to be organised along a gradient of emamectin benzoate concentration. The GLMM corroborated this by showing that emamectin benzoate had the strongest negative effect on total crustacean abundance and species richness, though there was some degree of collinearity with organic carbon, that had a smaller effect. Overall, this study shows that, following its use as an in-feed treatment for sea lice, emamectin benzoate residues are more widely distributed in the benthic environment than previously thought, and have a statistically significant effect on benthic ecology at the concentrations observed in this study.


Subject(s)
Antiparasitic Agents/adverse effects , Aquatic Organisms/physiology , Biota , Environmental Monitoring , Ivermectin/analogs & derivatives , Animals , Aquatic Organisms/drug effects , Benzamides/adverse effects , Biota/drug effects , Copepoda , Fisheries , Ivermectin/adverse effects , Scotland , Seawater
9.
Prim Care Diabetes ; 13(2): 134-141, 2019 04.
Article in English | MEDLINE | ID: mdl-30448412

ABSTRACT

AIMS: Gestational diabetes (GDM) and Type 2 diabetes pose tremendous health and economic burdens as worldwide incidence increases. Primary care-based systematic diabetes screening and prevention programs could be effective in women with previous GDM. GooD4Mum aimed to determine whether a Quality Improvement Collaborative (QIC) would improve postpartum diabetes screening and prevention planning in women with previous GDM in general practice. METHODS: Fifteen general practices within Victoria (Australia) participated in a 12-month QIC, consisting of baseline and four quarterly audits, guideline-led workshops and Plan-Do-Study-Act feedback cycles after each audit. The primary outcome measures were the proportion of women on local GDM registers completing a diabetes screening test and a diabetes prevention planning consultation within the previous 15 months. RESULTS: Diabetes screening increased with rates more than doubled from 26% to 61% and postpartum screening increased from 43%-60%. Diabetes prevention planning consultations did not show the same level of increase (0%-10%). The recording of body mass index improved overall (51%-69%) but the number of women with normal body mass index did not. CONCLUSIONS: GooD4Mum supported increased diabetes screening and the monitoring of high risk women with previous GDM in general practice.


Subject(s)
Diabetes Mellitus, Type 2/prevention & control , Diabetes, Gestational/therapy , General Practice , Mass Screening/methods , Maternal Health , Primary Health Care , Primary Prevention/methods , Quality Improvement , Quality Indicators, Health Care , Adult , Aged , Diabetes Mellitus, Type 2/diagnosis , Diabetes Mellitus, Type 2/epidemiology , Diabetes, Gestational/diagnosis , Diabetes, Gestational/epidemiology , Female , Health Status , Humans , Middle Aged , Predictive Value of Tests , Pregnancy , Protective Factors , Risk Assessment , Risk Factors , Victoria/epidemiology
10.
Math Biosci ; 300: 130-137, 2018 06.
Article in English | MEDLINE | ID: mdl-29596852

ABSTRACT

We have shown previously that different homeostatic mechanisms in biochemistry create input-output curves with a "chair" shape. At equilibrium, for intermediate values of a parameter (often an input), a variable, Z, changes very little (the homeostatic plateau), but for low and high values of the parameter, Z changes rapidly (escape from homeostasis). In all cases previously studied, the steady state was stable for each value of the input parameter. Here we show that, for the feedback inhibition motif, stability may be lost through a Hopf bifurcation on the homeostatic plateau and then regained by another Hopf bifurcation. If the limit cycle oscillations are relatively small in the unstable interval, then the variable Z maintains homeostasis despite the instability. We show that the existence of an input interval in which there are oscillations, the length of the interval, and the size of the oscillations depend in interesting and complicated ways on the properties of the inhibition function, f, the length of the chain, and the size of a leakage parameter.


Subject(s)
Biochemical Phenomena/physiology , Gene Expression Regulation/physiology , Homeostasis/physiology , Models, Biological , Animals , Humans
11.
Obes Sci Pract ; 3(1): 59-68, 2017 Mar.
Article in English | MEDLINE | ID: mdl-31516724

ABSTRACT

OBJECTIVE: To investigate the association between eating traits (e.g. dietary restraint or opportunistic eating) and weight - both cross-sectionally and longitudinally - and whether physical activity (PA) moderates these associations. METHODS: Two-hundred seventy young adults (21-35 years; BMI: 25.40 kg/m2 [SD = 3.90 kg/m2]; 48.90% female) participated in this 12-month observational cohort study. Cognitive Restraint (CR), Disinhibition (DI) and Hunger (HU) were measured using the Three-Factor Eating Questionnaire at baseline and 12 months. Participants were measured at quarterly intervals for objectively measured PA and anthropometrics. Cross-sectional and longitudinal models determined if eating traits were associated with weight or weight change, and whether these associations were moderated by PA. RESULTS: At baseline, higher CR (B = 0.429, p < 0.01) and DI (B = 0.942, p < 0.01) were associated with higher weight. The associations of DI (B = -0.008 p = 0.02) and HU (B = -0.006, p = 0.04) with weight were moderated by PA at baseline. The longitudinal model for CR determined PA altered the relationship between change in CR and weight change (B = 0.004, p < 0.01). CONCLUSIONS: Eating traits and PA are associated with weight and weight change. However, to elucidate how PA and eating traits directly affect weight changes, future weight loss interventions should investigate whether improving eating traits and concomitantly increasing PA amplify weight loss.

12.
Z Gastroenterol ; 54(12): 1296-1305, 2016 Dec.
Article in English | MEDLINE | ID: mdl-27936479

ABSTRACT

Background: Hepatocellular carcinoma (HCC) is one of the leading causes of death in cirrhotic patients worldwide. The detection rate for early stage HCC remains low despite screening programs. Thus, the majority of HCC cases are detected at advanced tumor stages with limited treatment options. To facilitate earlier diagnosis, this study aims to validate the added benefit of the combination of AFP, the novel biomarkers AFP-L3, DCP, and an associated novel diagnostic algorithm called GALAD. Material and methods: Between 2007 and 2008 and from 2010 to 2012, 285 patients newly diagnosed with HCC and 402 control patients suffering from chronic liver disease were enrolled. AFP, AFP-L3, and DCP were measured using the µTASWako i30 automated immunoanalyzer. The diagnostic performance of biomarkers was measured as single parameters and in a logistic regression model. Furthermore, a diagnostic algorithm (GALAD) based on gender, age, and the biomarkers mentioned above was validated. Results: AFP, AFP-L3, and DCP showed comparable sensitivities and specifities for HCC detection. The combination of all biomarkers had the highest sensitivity with decreased specificity. In contrast, utilization of the biomarker-based GALAD score resulted in a superior specificity of 93.3 % and sensitivity of 85.6 %. In the scenario of BCLC 0/A stage HCC, the GALAD algorithm provided the highest overall AUROC with 0.9242, which was superior to any other marker combination. Conclusions: We could demonstrate in our cohort the superior detection of early stage HCC with the combined use of the respective biomarkers and in particular GALAD even in AFP-negative tumors.


Subject(s)
Algorithms , Biomarkers, Tumor/metabolism , Carcinoma, Hepatocellular/metabolism , Carcinoma, Hepatocellular/pathology , Liver Neoplasms/metabolism , Liver Neoplasms/pathology , Age Distribution , Aged , Biomarkers/metabolism , Carcinoma, Hepatocellular/diagnosis , Female , Germany/epidemiology , Humans , Liver Neoplasms/diagnosis , Male , Middle Aged , Neoplasm Staging , Protein Precursors/metabolism , Prothrombin/metabolism , Reproducibility of Results , Sensitivity and Specificity , Sex Distribution , alpha-Fetoproteins/metabolism
13.
Cancer Immunol Res ; 4(9): 799-811, 2016 09 02.
Article in English | MEDLINE | ID: mdl-27485135

ABSTRACT

Despite clinical potential and recent advances, durable immunotherapeutic ablation of solid tumors is not routinely achieved. IL15 expands natural killer cell (NK), natural killer T cell (NKT) and CD8(+) T-cell numbers and engages the cytotoxic program, and thus is under evaluation for potentiation of cancer immunotherapy. We found that short-term therapy with IL15 bound to soluble IL15 receptor α-Fc (IL15cx; a form of IL15 with increased half-life and activity) was ineffective in the treatment of autochthonous PyMT murine mammary tumors, despite abundant CD8(+) T-cell infiltration. Probing of this poor responsiveness revealed that IL15cx only weakly activated intratumoral CD8(+) T cells, even though cells in the lung and spleen were activated and dramatically expanded. Tumor-infiltrating CD8(+) T cells exhibited cell-extrinsic and cell-intrinsic resistance to IL15. Our data showed that in the case of persistent viral or tumor antigen, single-agent systemic IL15cx treatment primarily expanded antigen-irrelevant or extratumoral CD8(+) T cells. We identified exhaustion, tissue-resident memory, and tumor-specific molecules expressed in tumor-infiltrating CD8(+) T cells, which may allow therapeutic targeting or programming of specific subsets to evade loss of function and cytokine resistance, and, in turn, increase the efficacy of IL2/15 adjuvant cytokine therapy. Cancer Immunol Res; 4(9); 799-811. ©2016 AACR.


Subject(s)
CD8-Positive T-Lymphocytes/immunology , CD8-Positive T-Lymphocytes/metabolism , Interleukin-15/metabolism , Lymphocytes, Tumor-Infiltrating/immunology , Lymphocytes, Tumor-Infiltrating/metabolism , Neoplasms/immunology , Neoplasms/metabolism , Animals , CD8-Positive T-Lymphocytes/drug effects , Cytokines/metabolism , Drug Resistance, Neoplasm , Female , Gene Expression Regulation, Neoplastic , Immunologic Factors/metabolism , Immunologic Factors/pharmacology , Immunologic Memory , Interleukin-15/pharmacology , Interleukin-15 Receptor alpha Subunit/metabolism , Lymphocytes, Tumor-Infiltrating/drug effects , Mice , Mice, Transgenic , Neoplasms/drug therapy , Neoplasms/pathology , Tumor Burden
14.
J Crit Care ; 36: 35-42, 2016 12.
Article in English | MEDLINE | ID: mdl-27546745

ABSTRACT

PURPOSE: To improve jugular central venous access device (CVAD) securement, prevent CVAD failure (composite: dislodgement, occlusion, breakage, local or bloodstream infection), and assess subsequent trial feasibility. MATERIALS AND METHODS: Study design was a 4-arm, parallel, randomized, controlled, nonblinded, pilot trial. Patients received CVAD securement with (i) suture+bordered polyurethane (suture + BPU; control), (ii) suture+absorbent dressing (suture + AD), (iii) sutureless securement device+simple polyurethane (SSD+SPU), or (iv) tissue adhesive+simple polyurethane (TA+SPU). Midtrial, due to safety, the TA+SPU intervention was replaced with a suture + TA+SPU group. RESULTS: A total of 221 patients were randomized with 2 postrandomization exclusions. Central venous access device failure was as follows: suture + BPU controls, 2 (4%) of 55 (0.52/1000 hours); suture + AD, 1 (2%) of 56 (0.26/1000 hours, P=.560); SSD+SPU, 4 (7%) of 55 (1.04/1000 hours, P=.417); TA+SPU, 4 (17%) of 23 (2.53/1000 hours, P=.049); and suture + TA+SPU, 0 (0%) of 30 (P=.263; intention-to-treat, log-rank tests). Central venous access device failure was predicted (P<.05) by baseline poor/fair skin integrity (hazard ratio, 9.8; 95% confidence interval, 1.2-79.9) or impaired mental state at CVAD removal (hazard ratio, 14.2; 95% confidence interval, 3.0-68.4). CONCLUSIONS: Jugular CVAD securement is challenging in postcardiac surgical patients who are coagulopathic and mobilized early. TA+SPU was ineffective for CVAD securement and is not recommended. Suture + TA+SPU appeared promising, with zero CVAD failure observed. Future trials should resolve uncertainty about the comparative effect of suture + TA+SPU, suture + AD, and SSD+SPU vs suture + BPU.


Subject(s)
Cardiac Surgical Procedures , Catheterization, Central Venous , Catheters, Indwelling , Jugular Veins , Aged , Bandages , Equipment Failure , Female , Humans , Male , Pilot Projects , Polyurethanes , Suture Techniques , Treatment Outcome
15.
Diabet Med ; 33(6): 803-11, 2016 06.
Article in English | MEDLINE | ID: mdl-26435033

ABSTRACT

AIM: To use continuous glucose monitoring to examine the effects of insulin initiation with glargine, with or without glulisine, on glycaemic variability and glycaemia in a cohort of people with Type 2 diabetes receiving maximum oral hypoglycaemic agents in primary healthcare. METHODS: We conducted a post hoc analysis of continuous glucose monitoring data from 89 participants at baseline and at 24 weeks after insulin commencement. Indicators of glycaemic variability (standard deviation, J-index and mean amplitude of glycaemic excursion) and glycaemia (HbA1c , mean glucose, area under the glucose-time curve) were assessed. Multi-level regression analysis was used to identify the predictors of change. RESULTS: Complete glycaemic variability data were available for 78 participants. Of these participants, 41% were women, their mean (sd) age was 59.2 (10.4) years, the median (interquartile range) diabetes duration was 10.4 (6.5, 13.3) years and the median (interquartile range) baseline HbA1c was 82.5 (71.6, 96.7) mmol/mol [9.7 (8.7, 11.0)%]. At baseline, BMI correlated negatively with standard deviation (r = -0.30) and mean amplitude of glycaemic excursion (r = -0.26), but not with J-index; HbA1c correlated with J-index (r = 0.61) but not with mean amplitude of glycaemic excursion and standard deviation. After insulin initiation the mean (sd) glucose level decreased [from 12.0 (3.0) to 8.5 (1.6) mmol/l; P < 0.001], as did the median (interquartile range) J-index [from 66.9 (47.7, 95.1) to 36.9 (27.6, 49.8) mmol/l; P < 0.001]. Baseline HbA1c correlated with a greater J-index reduction (r = -0.45; P < 0.001). The mean amplitude of glycaemic excursion and standard deviation values were unchanged. The baseline temporal profile, showing elevated postprandial morning glucose levels, was unchanged after insulin initiation, despite an overall reduction in glycaemia. CONCLUSION: Insulin initiation reduced hyperglycaemia but did not alter glycaemic variability in adults with Type 2 diabetes receiving maximum oral hypoglycaemic agents. The most significant postprandial excursions were seen in the morning, which identifies prebreakfast as the most effective target for short-acting insulin therapy.


Subject(s)
Diabetes Mellitus, Type 2/drug therapy , Hypoglycemic Agents/administration & dosage , Insulin Glargine/administration & dosage , Insulin/analogs & derivatives , Administration, Oral , Adolescent , Adult , Aged , Aged, 80 and over , Blood Glucose/metabolism , Blood Glucose Self-Monitoring/methods , Cohort Studies , Diabetes Mellitus, Type 2/blood , Female , Glycated Hemoglobin/metabolism , Humans , Hyperglycemia/prevention & control , Insulin/administration & dosage , Male , Middle Aged , Treatment Outcome , Young Adult
16.
J Exp Med ; 212(12): 2027-39, 2015 Nov 16.
Article in English | MEDLINE | ID: mdl-26503445

ABSTRACT

ZEB2 is a multi-zinc-finger transcription factor known to play a significant role in early neurogenesis and in epithelial-mesenchymal transition-dependent tumor metastasis. Although the function of ZEB2 in T lymphocytes is unknown, activity of the closely related family member ZEB1 has been implicated in lymphocyte development. Here, we find that ZEB2 expression is up-regulated by activated T cells, specifically in the KLRG1(hi) effector CD8(+) T cell subset. Loss of ZEB2 expression results in a significant loss of antigen-specific CD8(+) T cells after primary and secondary infection with a severe impairment in the generation of the KLRG1(hi) effector memory cell population. We show that ZEB2, which can bind DNA at tandem, consensus E-box sites, regulates gene expression of several E-protein targets and may directly repress Il7r and Il2 in CD8(+) T cells responding to infection. Furthermore, we find that T-bet binds to highly conserved T-box sites in the Zeb2 gene and that T-bet and ZEB2 regulate similar gene expression programs in effector T cells, suggesting that T-bet acts upstream and through regulation of ZEB2. Collectively, we place ZEB2 in a larger transcriptional network that is responsible for the balance between terminal differentiation and formation of memory CD8(+) T cells.


Subject(s)
CD8-Positive T-Lymphocytes/immunology , Homeodomain Proteins/immunology , Lymphocytic Choriomeningitis/immunology , Repressor Proteins/immunology , T-Lymphocyte Subsets/immunology , Animals , CD8-Positive T-Lymphocytes/metabolism , Cell Differentiation/immunology , Flow Cytometry , Homeodomain Proteins/genetics , Host-Pathogen Interactions/immunology , Humans , Immunologic Memory/immunology , Lectins, C-Type , Lymphocytic Choriomeningitis/genetics , Lymphocytic Choriomeningitis/virology , Lymphocytic choriomeningitis virus/immunology , Lymphocytic choriomeningitis virus/physiology , Male , Mice, Inbred C57BL , Mice, Knockout , Mice, Transgenic , Oligonucleotide Array Sequence Analysis , Protein Binding/immunology , Receptors, Immunologic/immunology , Receptors, Immunologic/metabolism , Repressor Proteins/deficiency , Repressor Proteins/genetics , Reverse Transcriptase Polymerase Chain Reaction , T-Box Domain Proteins/immunology , T-Lymphocyte Subsets/metabolism , Transcriptome/genetics , Transcriptome/immunology , Zinc Finger E-box Binding Homeobox 2
17.
Nat Commun ; 6: 5794, 2015 Jan 07.
Article in English | MEDLINE | ID: mdl-25565005

ABSTRACT

Early T-cell precursor leukaemia (ETP-ALL) is a high-risk subtype of human leukaemia that is poorly understood at the molecular level. Here we report translocations targeting the zinc finger E-box-binding transcription factor ZEB2 as a recurrent genetic lesion in immature/ETP-ALL. Using a conditional gain-of-function mouse model, we demonstrate that sustained Zeb2 expression initiates T-cell leukaemia. Moreover, Zeb2-driven mouse leukaemia exhibit some features of the human immature/ETP-ALL gene expression signature, as well as an enhanced leukaemia-initiation potential and activated Janus kinase (JAK)/signal transducers and activators of transcription (STAT) signalling through transcriptional activation of IL7R. This study reveals ZEB2 as an oncogene in the biology of immature/ETP-ALL and paves the way towards pre-clinical studies of novel compounds for the treatment of this aggressive subtype of human T-ALL using our Zeb2-driven mouse model.


Subject(s)
Gene Expression Regulation, Neoplastic/physiology , Homeodomain Proteins/genetics , Leukemia, T-Cell/physiopathology , Repressor Proteins/genetics , Signal Transduction/physiology , Animals , Blotting, Western , Chromatin Immunoprecipitation , Flow Cytometry , Gene Expression Profiling , Gene Expression Regulation, Neoplastic/genetics , Histological Techniques , Homeodomain Proteins/immunology , Humans , Immunohistochemistry , In Situ Hybridization, Fluorescence , Janus Kinases/metabolism , Kaplan-Meier Estimate , Karyotyping , Luciferases , Mice , Real-Time Polymerase Chain Reaction , Receptors, Interleukin-7/metabolism , Repressor Proteins/immunology , STAT Transcription Factors/metabolism , Signal Transduction/genetics , Zinc Finger E-box Binding Homeobox 2
18.
Nat Immunol ; 16(1): 107-17, 2015 Jan.
Article in English | MEDLINE | ID: mdl-25419629

ABSTRACT

The strength with which complexes of self peptide and major histocompatibility complex (MHC) proteins are recognized by the T cell antigen receptor (TCR) dictates the homeostasis of naive CD8(+) T cells, but its effect on reactivity to foreign antigens is controversial. As expression of the negative regulator CD5 correlates with self-recognition, we studied CD5(lo) and CD5(hi) naive CD8(+) T cells. Gene-expression characteristics suggested CD5(hi) cells were better poised for reactivity and differentiation than were CD5(lo) cells, and we found that the CD5(hi) pool also exhibited more efficient clonal recruitment and expansion, as well as enhanced reactivity to inflammatory cues, during the recognition of foreign antigen. However, the recognition of complexes of foreign peptide and MHC was similar for both subsets. Thus, CD8(+) T cells with higher self-reactivity dominate the immune response to foreign antigens, with implications for T cell repertoire diversity and autoimmunity.


Subject(s)
Autoantigens/immunology , CD5 Antigens/immunology , CD8-Positive T-Lymphocytes/immunology , Major Histocompatibility Complex/immunology , Receptors, Antigen, T-Cell/immunology , Animals , Female , Flow Cytometry , Gene Expression Profiling , Homeostasis/immunology , Mice, Inbred C57BL , Mice, Knockout , Mice, Transgenic , Phenotype , Specific Pathogen-Free Organisms
19.
Diabetes Metab ; 40(4): 284-91, 2014 Sep.
Article in English | MEDLINE | ID: mdl-25059703

ABSTRACT

AIM: This was a retrospective cohort study that evaluated the differences in glycated haemoglobin (HbA1c) and body mass index (BMI) in veterans with type 2 diabetes mellitus (T2DM), prescribed exenatide twice daily (BID) versus long-acting insulin analog (LAIA) two years after initiation in the United States (US) veteran population. MATERIALS AND METHODS: Patients were included if they were ≥ 18 years old with T2DM, and initiated exenatide BID or LAIA at the Veterans Health Administration between January 1, 2006 and December 31, 2010. Multivariate models were used to evaluate the changes in HbA1c and BMI between groups, controlling for potential confounders. Logistic regression was used to evaluate the odds of achieving ≥ 0.5% HbA1c reduction based on baseline HbA1c stratifications: low,<7%; moderate, 7% to<9%; and high,≥ 9%. RESULTS: A total of 446 exenatide BID and 51,531 LAIA patients met inclusion/exclusion criteria. On average, exenatide BID patients were significantly older (64 versus 60 years) with a higher BMI (37.8 versus 32.9 kg/m(2)). Baseline HbA1c was 8.2% and 8.8% for exenatide BID and LAIA patients, respectively (P<0.001); otherwise, patients were similar for all other characteristics. Exenatide BID treatment was significantly associated with a 0.32% (95%CI: 0.18-0.47%) greater reduction in HbA1c at two years compared with LAIA. Similar findings were observed for BMI reduction (0.68 kg/m(2); 95%CI: 0.42-0.95 kg/m(2)). Exenatide BID patients with moderate baseline HbA1c had significantly higher odds of achieving ≥ 0.5% HbA1c reduction compared with LAIA patients (OR=1.5; 95%CI: 1.2-2.0). CONCLUSIONS: Veterans treated with exenatide BID had significantly greater reduction in HbA1c and BMI compared with patients treated with LAIA patients two years after initiation.


Subject(s)
Diabetes Mellitus, Type 2/drug therapy , Hypoglycemic Agents/administration & dosage , Insulin, Long-Acting/administration & dosage , Peptides/administration & dosage , Venoms/administration & dosage , Veterans , Aged , Cohort Studies , Diabetes Mellitus, Type 2/blood , Exenatide , Female , Glycated Hemoglobin/metabolism , Humans , Male , Middle Aged , Retrospective Studies , United States , Veterans Health
20.
Dtsch Med Wochenschr ; 139(17): 878-82, 2014 May.
Article in German | MEDLINE | ID: mdl-24760689

ABSTRACT

BACKGROUND AND AIM: Clinical course and mortality of acute liver failure (ALF) are determined by its causes. Traditionally, fulminant hepatitis B infection (HBV) was thought to be the predominant etiology of ALF in Germany. However, recent studies, conducted in American and European cohorts pointed to drug-induced liver injury (DILI) as the major cause. Aim of this study was to identify currently predominant etiologies of ALF in a monocenter study at a leading transplant center in Germany. PATIENTS AND METHODS: The data of 161 patients admitted with ALF from 1/2002 to 12/2012 were analyzed retrospectively. All patients fulfilled the criteria of the "Acute Liver Failure Study Group Germany" (international normalized ratio (INR) ≥ 1.5, hepatic encephalopathy ≥ stage 1). RESULTS: DILI was the leading cause of ALF in this cohort. About 20 % of ALF patients with DILI died or received liver transplantats. Mortality rate was highest in ALF patients with unknown etiology and those without specific therapy available. CONCLUSIONS: In Europe ALF etiologies exhibit a North-South divide. In Germany the most common cause for ALF is idiosyncratic pharmacological intoxication followed by acute hepatitis B.


Subject(s)
Chemical and Drug Induced Liver Injury/etiology , End Stage Liver Disease/chemically induced , Liver Failure, Acute/chemically induced , Adolescent , Adult , Aged , Chemical and Drug Induced Liver Injury/diagnosis , Chemical and Drug Induced Liver Injury/mortality , Chemical and Drug Induced Liver Injury/surgery , Cohort Studies , End Stage Liver Disease/diagnosis , End Stage Liver Disease/mortality , End Stage Liver Disease/surgery , Female , Germany , Hospitals, Special , Humans , Liver Failure, Acute/diagnosis , Liver Failure, Acute/mortality , Liver Failure, Acute/surgery , Liver Function Tests , Liver Transplantation , Male , Middle Aged , Postoperative Complications/diagnosis , Postoperative Complications/mortality , Retrospective Studies , Risk Factors , Survival Analysis , Young Adult
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