AIM:To test the ability of adult-derived human liver stem/progenitor cells(ADHLSC)from large scale cultures to conjugate bilirubin in vitro and in bilirubin conjugation deficient rat.METHODS:ADHLSC from large scale cu...AIM:To test the ability of adult-derived human liver stem/progenitor cells(ADHLSC)from large scale cultures to conjugate bilirubin in vitro and in bilirubin conjugation deficient rat.METHODS:ADHLSC from large scale cultures were tested for their phenotype and for their capacity to conjugate bilirubin in vitro after hepatogenic differentiation.In vivo,Gunn rats[uridine diphosphate-glucuronosyltransferase 1A1(UGT1A1)deficient animal]were injected with ADHLSC and cryopreserved hepatocytes(positive control).Two,4,13 and 27 wk posttransplantation,transplanted Gunn rat bilirubin serum levels were determined by high performance liquid chromatography.Human cell engraftment of trans-planted cells was assessed 27 wk post-transplantation using immunohistochemistry and RTqPCR.RESULTS:Large scale culture conditions do not modified ADHLSC phenotype,ADHLSC were able to specifically conjugate bilirubin.ADHLSC were intraportally injected into Gunn rats and blood UCB was measured at different times post-transplantation,infused-Gunn rats exhibited a metabolic effect 3 mo post-transplantation and maintained over a 6 mo period.ADHLSC engraftment into Gunn rat’s liver was demonstrated by RTqPCR and immunohistochemistry against albumin and UGT1A1.CONCLUSION:ADHLSC from large scale cultures are efficient in conjugating bilirubin in vitro and in restoring a deficient metabolic function(reducing bilirubin level)in hyperbilirubinemic rats.展开更多
Background: Several studies have demonstrated that e-waste workers had a risk to develop the respiratory disorders but this was not specifically differentiated according to the type of the e-waste activities. The main...Background: Several studies have demonstrated that e-waste workers had a risk to develop the respiratory disorders but this was not specifically differentiated according to the type of the e-waste activities. The main aim of this study was to evaluate if the risk to develop respiratory disorders was different according to the type of activities carried out by the e-waste workers. Methods: A cross sectional study was conducted in Abidjan and Cotonou, two big cities in West Africa. The participants were randomly selected based on the list of e-waste workers provided by the census of different sites of e-waste. The spirometry was performed on all the study participants to assess whether they had respiratory disorders. A regression logistic model was performed to estimate the risk of developing respiratory disorders according to the type of activities carried out by the e-waste workers. Results: In total 308 e-waste workers including 149 at Abidjan and 159 at Cotonou were interviewed. Participants of this study ranged in age from 14 years to 69 years and the mean age was 33.71 ± 10.96. The main activities carried out by the study participants were respectively repairing (44.8%), buying or selling (40.3%), dismantling (31.8%). The prevalence of respiratory disorders was 20.1%. The multivariate analysis had not found a significant association between the type of activities and the presence of respiratory disorders. Conclusion: The effect of exposure to e-waste on respiratory health of workers was not different according to the type of activities. So, any policy that aims to reduce the risk of exposure on respiratory health must take into account all the e-waste workers regardless of the type of activities they perform in this sector.展开更多
Background: Nasal potential difference (NPD) test has long been used to assist in the diagnosis of Cystic Fibrosis (CF) and more recently as an outcome measure in clinical trials of new CF therapies. This test has als...Background: Nasal potential difference (NPD) test has long been used to assist in the diagnosis of Cystic Fibrosis (CF) and more recently as an outcome measure in clinical trials of new CF therapies. This test has also been adapted to the mouse nose. Objectives: We aimed at evaluating variability of the NPD measurements in CF patients displaying two severe CFTR mutations and in sex-matched healthy controls. NPD recorded from F508del-CF and normal wild-type mice were also compared. Methods and results: In each setting, tests were performed by a single qualified operator. In the clinical setting, the latest standardized operation protocol of the CF foundation was followed. A total of 80 tracings were obtained from 10 patients (23.2 y;range 14 to 32) and 10 healthy subjects (34 y;range 24 to 53), each tested twice, in both nostrils. Two CF and two controls were excluded from the statistical data analysis due to the presence of a single non interpretable NPD tracing (4/80, 5%). To achieve equal sample size, tests were obtained from 8 CF mice and normal wild-type. Comprehensive multivariate analysis of paired data showed a good reproducibility of NPD parameters in the clinical and the preclinical setting;lower variability was observed in mice. However, 95% repeatability limits of NPD parameters were large indicating a large measurement error, poor precision and low within-subject repeatability. In both settings, chloride secretion was shown to be the most reproducible and repeatable parameter. Conclusion: In human as in mice, NPD showed good reproducibility but limited within-subject repeatability.展开更多
<b><span style="font-family:Verdana;">Introduction: </span></b><span style="font-family:""><span style="font-family:Verdana;">Urban Air pollution ...<b><span style="font-family:Verdana;">Introduction: </span></b><span style="font-family:""><span style="font-family:Verdana;">Urban Air pollution is increasingly becoming a major health and sustainable development issue. Several studies showed that Traffic-related air pollution (TRAP) is one of the main sources of urban air pollution and has serious consequences on respiratory health. As no systematic review focused on the traffic-related air pollution and respiratory health in the target population of individuals working in a shop or in an office or individuals living along the trunk road, the authors conducted the current study to try to fill this gap. </span><b><span style="font-family:Verdana;">Methods</span></b><span style="font-family:Verdana;">: A systematic review search was conducted using MEDLINE (PubMed), Scientific Research Publishing: SCIRP, Web of Science, Google scholar. Studies were included if they meet the following selection criteria: </span></span><span style="font-family:Verdana;">1</span><span style="font-family:Verdana;">) focus on population working or living along a major/trunk road</span><span style="font-family:Verdana;">;</span><span style="font-family:""> </span><span style="font-family:Verdana;">2</span><span style="font-family:Verdana;">) studies had reported clearly at least on the exposure variables related to TRAP</span><span style="font-family:Verdana;">;</span><span style="font-family:""> </span><span style="font-family:Verdana;">3</span><span style="font-family:""><span style="font-family:Verdana;">) the association between TRAP and development of respiratory symptoms or respiratory diseases was established. </span><b><span style="font-family:Verdana;">Results: </span></b><span style="font-family:Verdana;">13 articles were selected on the 192 articles that were retrieved in the initial research. Exposure to traffic-related air pollution was determined by using distance to road, traffic intensity and pollutants measured. The main respiratory health problems found were cough, wheeze, asthma and bronchitis. No article discussed about roundabouts in characterizing exposure to traffic-related air pollution. </span><b><span style="font-family:Verdana;">Conclusion: </span></b><span style="font-family:Verdana;">Distance to road, traffic density and pollutants measured are the usual methods to characterize the exposure to traffic-related air pollution and its consequences on respiratory health. Regarding the context of area occupations in African cities, it is necessary to focus on population around roundabouts and see if they are not more exposed to TRAP.展开更多
Objective: Air pollution is becoming one of the public concerns requiring urgent feasible response per local context. Defining accurately the level of exposure of outdoor air pollution effect on health of venders work...Objective: Air pollution is becoming one of the public concerns requiring urgent feasible response per local context. Defining accurately the level of exposure of outdoor air pollution effect on health of venders working along main roads and roundabouts with high traffic is important. This study was conducted to assess respiratory health risks on venders associated with different geographical positions in Cotonou. Methods: A cross-sectional study was conducted along the main road with high traffic including three roundabouts in Cotonou. The 194 study participants from all shops, one respondent per shop, were given a unique GPS data associated to indicate the shop’s geographical position. The study employed validated questionnaire on respiratory symptoms. Results: Study participants had mean age of 36.26 (±11.65) years with sex ratio of (M/F) 1.8. Majority (72.7%) of study participates reported to have at least one respiratory symptom and 69% of them were working in non-ventilated rooms. The proportion of having at least one respiratory symptom was significantly different (p Conclusion: Working in roundabout is associated with more respiratory symptoms than working in shops along main road. Air pollution mitigation efforts should focus in such settings, taking into account the sub-population of workers in resource limited countries.展开更多
基金Supported by Fonds pour la formation à la recherche dans l’industrie et dans l’agriculture
文摘AIM:To test the ability of adult-derived human liver stem/progenitor cells(ADHLSC)from large scale cultures to conjugate bilirubin in vitro and in bilirubin conjugation deficient rat.METHODS:ADHLSC from large scale cultures were tested for their phenotype and for their capacity to conjugate bilirubin in vitro after hepatogenic differentiation.In vivo,Gunn rats[uridine diphosphate-glucuronosyltransferase 1A1(UGT1A1)deficient animal]were injected with ADHLSC and cryopreserved hepatocytes(positive control).Two,4,13 and 27 wk posttransplantation,transplanted Gunn rat bilirubin serum levels were determined by high performance liquid chromatography.Human cell engraftment of trans-planted cells was assessed 27 wk post-transplantation using immunohistochemistry and RTqPCR.RESULTS:Large scale culture conditions do not modified ADHLSC phenotype,ADHLSC were able to specifically conjugate bilirubin.ADHLSC were intraportally injected into Gunn rats and blood UCB was measured at different times post-transplantation,infused-Gunn rats exhibited a metabolic effect 3 mo post-transplantation and maintained over a 6 mo period.ADHLSC engraftment into Gunn rat’s liver was demonstrated by RTqPCR and immunohistochemistry against albumin and UGT1A1.CONCLUSION:ADHLSC from large scale cultures are efficient in conjugating bilirubin in vitro and in restoring a deficient metabolic function(reducing bilirubin level)in hyperbilirubinemic rats.
文摘Background: Several studies have demonstrated that e-waste workers had a risk to develop the respiratory disorders but this was not specifically differentiated according to the type of the e-waste activities. The main aim of this study was to evaluate if the risk to develop respiratory disorders was different according to the type of activities carried out by the e-waste workers. Methods: A cross sectional study was conducted in Abidjan and Cotonou, two big cities in West Africa. The participants were randomly selected based on the list of e-waste workers provided by the census of different sites of e-waste. The spirometry was performed on all the study participants to assess whether they had respiratory disorders. A regression logistic model was performed to estimate the risk of developing respiratory disorders according to the type of activities carried out by the e-waste workers. Results: In total 308 e-waste workers including 149 at Abidjan and 159 at Cotonou were interviewed. Participants of this study ranged in age from 14 years to 69 years and the mean age was 33.71 ± 10.96. The main activities carried out by the study participants were respectively repairing (44.8%), buying or selling (40.3%), dismantling (31.8%). The prevalence of respiratory disorders was 20.1%. The multivariate analysis had not found a significant association between the type of activities and the presence of respiratory disorders. Conclusion: The effect of exposure to e-waste on respiratory health of workers was not different according to the type of activities. So, any policy that aims to reduce the risk of exposure on respiratory health must take into account all the e-waste workers regardless of the type of activities they perform in this sector.
文摘Background: Nasal potential difference (NPD) test has long been used to assist in the diagnosis of Cystic Fibrosis (CF) and more recently as an outcome measure in clinical trials of new CF therapies. This test has also been adapted to the mouse nose. Objectives: We aimed at evaluating variability of the NPD measurements in CF patients displaying two severe CFTR mutations and in sex-matched healthy controls. NPD recorded from F508del-CF and normal wild-type mice were also compared. Methods and results: In each setting, tests were performed by a single qualified operator. In the clinical setting, the latest standardized operation protocol of the CF foundation was followed. A total of 80 tracings were obtained from 10 patients (23.2 y;range 14 to 32) and 10 healthy subjects (34 y;range 24 to 53), each tested twice, in both nostrils. Two CF and two controls were excluded from the statistical data analysis due to the presence of a single non interpretable NPD tracing (4/80, 5%). To achieve equal sample size, tests were obtained from 8 CF mice and normal wild-type. Comprehensive multivariate analysis of paired data showed a good reproducibility of NPD parameters in the clinical and the preclinical setting;lower variability was observed in mice. However, 95% repeatability limits of NPD parameters were large indicating a large measurement error, poor precision and low within-subject repeatability. In both settings, chloride secretion was shown to be the most reproducible and repeatable parameter. Conclusion: In human as in mice, NPD showed good reproducibility but limited within-subject repeatability.
文摘<b><span style="font-family:Verdana;">Introduction: </span></b><span style="font-family:""><span style="font-family:Verdana;">Urban Air pollution is increasingly becoming a major health and sustainable development issue. Several studies showed that Traffic-related air pollution (TRAP) is one of the main sources of urban air pollution and has serious consequences on respiratory health. As no systematic review focused on the traffic-related air pollution and respiratory health in the target population of individuals working in a shop or in an office or individuals living along the trunk road, the authors conducted the current study to try to fill this gap. </span><b><span style="font-family:Verdana;">Methods</span></b><span style="font-family:Verdana;">: A systematic review search was conducted using MEDLINE (PubMed), Scientific Research Publishing: SCIRP, Web of Science, Google scholar. Studies were included if they meet the following selection criteria: </span></span><span style="font-family:Verdana;">1</span><span style="font-family:Verdana;">) focus on population working or living along a major/trunk road</span><span style="font-family:Verdana;">;</span><span style="font-family:""> </span><span style="font-family:Verdana;">2</span><span style="font-family:Verdana;">) studies had reported clearly at least on the exposure variables related to TRAP</span><span style="font-family:Verdana;">;</span><span style="font-family:""> </span><span style="font-family:Verdana;">3</span><span style="font-family:""><span style="font-family:Verdana;">) the association between TRAP and development of respiratory symptoms or respiratory diseases was established. </span><b><span style="font-family:Verdana;">Results: </span></b><span style="font-family:Verdana;">13 articles were selected on the 192 articles that were retrieved in the initial research. Exposure to traffic-related air pollution was determined by using distance to road, traffic intensity and pollutants measured. The main respiratory health problems found were cough, wheeze, asthma and bronchitis. No article discussed about roundabouts in characterizing exposure to traffic-related air pollution. </span><b><span style="font-family:Verdana;">Conclusion: </span></b><span style="font-family:Verdana;">Distance to road, traffic density and pollutants measured are the usual methods to characterize the exposure to traffic-related air pollution and its consequences on respiratory health. Regarding the context of area occupations in African cities, it is necessary to focus on population around roundabouts and see if they are not more exposed to TRAP.
文摘Objective: Air pollution is becoming one of the public concerns requiring urgent feasible response per local context. Defining accurately the level of exposure of outdoor air pollution effect on health of venders working along main roads and roundabouts with high traffic is important. This study was conducted to assess respiratory health risks on venders associated with different geographical positions in Cotonou. Methods: A cross-sectional study was conducted along the main road with high traffic including three roundabouts in Cotonou. The 194 study participants from all shops, one respondent per shop, were given a unique GPS data associated to indicate the shop’s geographical position. The study employed validated questionnaire on respiratory symptoms. Results: Study participants had mean age of 36.26 (±11.65) years with sex ratio of (M/F) 1.8. Majority (72.7%) of study participates reported to have at least one respiratory symptom and 69% of them were working in non-ventilated rooms. The proportion of having at least one respiratory symptom was significantly different (p Conclusion: Working in roundabout is associated with more respiratory symptoms than working in shops along main road. Air pollution mitigation efforts should focus in such settings, taking into account the sub-population of workers in resource limited countries.