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Biomedical subjects

D Bourderont

Publications and source records attributed to D Bourderont.

14 recordsLinked to original sources
PubMed1998

Mature accessory cells influence long-term growth of human hematopoietic progenitors on a murine stromal cell feeder layer.

A recently described long-term culture system for early human progenitor cells was established with the murine preadipocyte stromal line FBMD-1 grown in 96-well plates; cobblestone areas formed by inoculated hematopoietic cells are determined in a limiting dilution setting after five weeks' culture. To compare the capacity of cobblestone-area-forming cell (CAFC) formation by bone marrow and leukapheresis products in this system, mononuclear cells (MNC) of both origins were cultured. As related to CD34+ cell content, CAFC yields after five weeks' culture were in the same range in bone marrow and leukapheresis stemming from patients with efficient mobilization of hematopoietic cells. In purified CD34+ cell fractions, the CAFC yield per inoculated cell number was considerably higher than in MNC; however, if the CAFC number was related to the inoculated CD34+ cell number in MNC and after purification, the yield was four to eight times decreased in purified fractions. Addition of the mature cells brought the CAFC yield back up to the numbers obtained in the unseparated MNC fraction. By contrast, slightly more advanced progenitors per CAFC were found in cultures of purified hematopoietic cells from both origins than in whole MNC. The results suggest that mature human accessory cells give noticeable support to recruitment of early progenitors on this feeder but lead to lower yield of GM progenitors.

Adult↗
PubMed1998

Primordial role of CD34+ 38- cells in early and late trilineage haemopoietic engraftment after autologous blood cell transplantation.

In order to better define which cell subset contained in graft products might be the most predictive of haemopoietic recovery following autologous blood cell transplantation (ABCT), the relationships between the amounts of reinfused mononuclear cells (MNC), CFU-GM, total CD34+ cells and their CD33 and CD38 subsets. and the successive stages of trilineage engraftment kinetics, were studied in 45 cancer patients, using the Spearman correlation test, a linear regression model and a log-inverse model. No relationship was found between the infused numbers of MNC, CD33+ and CD33- subsets observed and the numbers of days to reach predetermined absolute neutrophil (ANC), platelet and reticulocyte counts. The infused numbers of CFU-GM, CD34+ and CD34+ 38+ cells correlated inconstantly with haemopoietic recovery parameters. The strongest and the most constant correlations were significantly observed between the infused numbers of CD34+ 38- cells and each trilineage engraftment parameter. The log-inverse model determined a threshold dose of 0.05 x 10(6) (= 5 x 10(4)) CD34+ 38- cells/kg, below which the trilineage engraftment kinetics were significantly slower and unpredictable. Post-transplant TBI-conditioning regimens increased the low cell dose-related delay of engraftment kinetics whereas post-transplant administration of haemopoietic growth factors (HGF) seemed to abrogate this delay. This would justify clinical use of HGF only in patients transplanted with CD34+ 38- cell amounts lower than the proposed threshold value. This study suggests that the CD34+ 38- subpopulation, although essentially participating in late complete haemopoietic recovery, is also composed of committed progenitor cells involved in early trilineage engraftment.

ADP-ribosyl Cyclase↗
PubMed1996

[Interference of digoxin like immunoreactive substances with four recent reagents for digoxin determination].

The sensitivity of four new digoxin assay methods (on mini-Vidas bioMérieux, with Cedia reagent on Hitachi 911, with Syva Emit 2000 third generation reagent on Cobas-Mira and with Roche digoxin Online reagent on Cobas-Mira) to interference by digoxin like immunoreactive substances (DLIS) was studied in sera from 21 healthy controls, 18 pregnant women (9th month of pregnancy), 26 newborn infants and 42 patients with chronic renal failure undergoing hemodialysis. None of these individuals had been treated with digoxin or others cardiotonic drugs. For each method, results are different according to the population being studied, suggesting that the nature of DLIS is not the same. On the whole, interferences with DLIS seem to be more important in samples from newborn infants (for three methods out of four, the mean concentration of digoxin is significantly different from those observed in control samples). Digoxin assay on mini-Vidas and with Cedia reagent seems to be more sensitive to interference by DLIS, especially in samples from newborn infants and less in samples from pregnant women and patients with chronic renal failure. Online and Emit 2000 reagents seem to be poorly sensitive to interference by DLIS. However, for Emit 2000, the mean concentration of digoxin in samples from newborn infants is significantly different from the one observed in control samples. These results show that testing the sensitivity of new digoxine assay methods to interference by DLIS is very important because it can be a limitation to the use of a reagent independently of its analytical qualities.

Cardenolides↗
PubMed1996

[Determination of Hb A1c in chronic renal failure. Contribution of new methodologies].

Carbamylated haemoglobin arises from the non-enzymatic modification of haemoglobin by cyanate derived from spontaneous dissociation of urea. We studied the in vitro and in vivo interference of carbamylated haemoglobin in the assay of HbA1c by CLHP (ion exchange), affinity chromatography (IMX, Abbott) and immunoturbidimetry (Tina-Quant, Boehringer). For patients with chronic renal failure on continuous ambulatory peritoneal dialysis, CLHP assay of HbA1c gave an error of about +0.35% per 10 mmol/L of urea serum concentration. The IMX and especially Tina-Quant assays for measuring HbA1c were not sensitive to cyanate interference and constitute interesting alternatives for monitoring glycaemic balance in patients with chronic renal failure.

Chromatography, Affinity↗
PubMed1995

[Epidemiology of infantile asthma in the Le Havre region].

BACKGROUND: Prevalence of asthma is influenced by environmental factors which may be different from area to area. POPULATION AND METHODS: A cross-sectional epidemiological survey was carried out among 1,395 children attending primary schools in the city of Le Havre and the canton of Fécamp (Haute-Normandie). Questionnaires including data about the disease, family history, environmental and socio-economic factors were completed by the school physician in presence of the parents. RESULTS: Prevalence rate of asthma calculated from 1,193 questionnaires was 7.8%. The logistic regression curves pointed out four risk factors: family history of asthma (odds ratio: 2.52) or hay fever (OR: 1.98), atopic dermatitis (OR: 3.96), and parental smoking (OR: 1.79). Sex, socioeconomic status of parents, type of housing, presence of pets in the house were not related to prevalence of asthma. Frequency of cough during the day was only significantly different between both areas. CONCLUSIONS: The high level of school absence (21.1%) and frequency of hospitalizations for acute asthma (20.4%) should lead health professionals and educators to improve management of asthma in these areas.

Air Pollution↗
PubMed1995

Thyroid testing using the Cobas Core immunoassay system. A multicentre study.

The random access immunoanalyzer Cobas Core and the Cobas Core Thyroid Assays were assessed as to their clinical usefulness in the analysis of different thyroid diseases. Four centres participated in this study measuring the following five thyroid tests per sample on the instrument: thyrotropin, free thyroxine, thyroxine, triiodothyronine and free triiodothyronine. The assessment was based on studies of precision and clinical samples. Within- and between-series precisions showed a mean CV over all assays of 4.3 and 6.1%, respectively. Comparison of the test results with clinical data demonstrated that the Cobas Core results are in accordance with diagnosed thyroid diseases. A good discrimination between normal and disease status and between untreated and treated status was found. Furthermore, 370 sera measured with Technicon Immuno-1 TSH and FT4 assays were compared to the respective Cobas Core EIAs). A good correlation between the assays was demonstrated.

Evaluation Studies as Topic↗
PubMed1994

[Comparative study of lipids, apoproteins and lipoproteins in patients with coronary disease and in a control population].

We carried out a comparative study of various lipid parameters (apo AI and B, LpAI, Lp(a) and LpBCIII) in coronary heart disease patients (19 males and 4 females, mean age 61 +/- 11 years) and in controls (18 males and 14 females, mean age 55 +/- 3 years) selected so that cholesterol and triglycerides levels be beneath 6 and 2.3 mmol/l in both populations. Apo AI and B were analysed by immunonephelometry and lipoparticles by electroimmunodiffusion. Nonparametric statistics tests were performed on account of the small numbers in both groups. Our study confirms the protective effect of Lp AI but did not show an obvious superiority of Lp AI quantification compared to apo AI. It highlights the interest of Lp(a) as an independent and additional risk factor for atherogenesis: no obvious correlation with any other lipidic parameter was demonstrated. An increase in Lp(a) beyond 0.30 g/l increases atherogenic risk 2.5 fold. We did not show any benefit of LpBCIII quantification in 'normolipemic' coronary patients. In conclusion, a discriminant analysis including the apo B/apo AI and apo B/LpAI ratios and Lp(a) allows an accurate classification of 67% of the patients.

Apolipoproteins A↗
PubMed1991

[Legal and illicit drugs: diffusion of health information in schools. Results of cross-sectional epidemiological survey carried out among 663 adolescents in high schools in Le Havre].

In 1988, a cross-sectional study was undertaken in secondary modern schools from the city of Le Havre in order to assess the spread of health education regarding licit and illicit drugs and prepare a pedagogical kit including adolescent opinions on the subject. Through the school system, more than one adolescent out 5 had been taught about tobacco or alcohol, and 11% about illicit drugs. Only 6% had been informed about all 3 subjects, and 70% had not received any information. Regarding alcohol and tobacco, health education was positively appreciated by adolescents. Information related to potential health risk constituted the main source of satisfaction. Lastly, 62% of the adolescents were ready to set up a health promotion program on illicits drugs. This choice was not influenced by age, sex or school performance.

Adolescent↗
PubMed1989

[Licit and illicit drug consumption in the school environment. Results of a cross-sectional epidemiologic survey carried out among 663 high school students in Le Havre].

A cross-sectional epidemiologic study was undertaken in 1988 in the city of Le Havre, in order to study the licit and illicit drug consumption of adolescents attending high schools. The regular consumption of alcohol was higher in boys (9.2% vs 5.8%) whereas girls smoked more (16.4% vs 12.5%). In the group (4.2%) of every day drinkers, cider was the first alcoholic beverage used. One of 5 adolescents had been drunk at least once in 6 months, those over 15 years of age being involved twice as often as the youngest (28.2% vs 14.1%). The use of neuropsychotropic drugs was independent of sex, age and performance in school. Typological classification according to patterns of alcohol and drug consumption identified 4 groups of adolescents: the excessive consumers (3.6%), the moderate (25.6%), the abstainers (58.1%) and the consumers of psychotropic drugs (12.7%). The distribution of adolescents into these classes was influenced by age and, to a lesser extent, by school performance.

Adolescent↗
PubMed1988

[Consumption of legal and illegal drugs by school students from the region of Doubs].

Two surveys were carried out among high school students from the Doubs region in 1982 and 1985. Their objective was to determine how legal and illegal drugs were used and their importance among the target population. Alcohol was found to be more common among the male population and its consumption remained stable during the 1982-1985 period. The use of tobacco, however, increased dramatically, especially among females attending vocational schools. The surveys also revealed that the age at which smoking was attempted for the first time has lowered, family and school environment playing an important role. Of those students who smoked, 69% had parents and a close friend who smoked, whereas 16% had none in their immediate environment who smoked. It was noted that young girls used more often psycho-active medicines than boys. A noticeable increase in their use became evident especially in vocational schools. Of those students questioned, 43% of junior high school students, 10.3% of vocational school students and 14.8% of senior high school students, stated that they used illegal drugs and that their accessibility permitted a wide use of these products. Whatever the age or sex the following associations were the most significant: drugs-tobacco, drugs-alcohol, tobacco-alcohol. Health education must therefore make the promotion of preventive strategies, concerning legal and illegal drugs, a priority in the education of adolescents.

Adolescent↗
PubMedDate not supplied

[Cooperative program for domestic accidents of children in the department of Doubs. Epidemiological aspects].

This work presents the results of a survey carried out among 818 families in the department of the Doubs. Each family had a child between one and 6 years of age. Its aim was to come as close as possible to exploring morbidity in accidents by questioning parents about the accidents which took place a month before the investigation, and to study the influence of certain psychosocial factors on this pathology, for example the attitude of parents confronted with risks. The annual accident morbidity rate was 1,056 accidents per 1,000 children. In other words, each child has, on the average, one accident per year. Even though no significant difference between town and country has been noted, serious accidents occurred more frequently in rural areas. This may be explained by the way dangerous products are stored (medicines, household cleaning and agricultural products), looser parental surveillance (predominance at games outside home), as well as the fact that children are more often in the kitchen when they are indoors, which is potentially the most dangerous room. Classical notions of disturbing events occurring prior to the accident (divorce, moving, a.s.o.) and children who are "repeat offenders" have also been noticed. The examination of parental attitude in dealing with the possibility of accidents (instructive, lax or repressive) did not allow us to demonstrate in any significant way the influence of these attitudes on accidental morbidity. On the other hand the so-called "instructive" parents are the ones who best put away the poisonous products. There is therefore, an encouraging connection between attitude and behavior.

Accidents, Home↗
PubMedDate not supplied

[A cooperative program for the prevention of domestic accidents in children at the department of the Doubs. II. Educative aspects and evaluation].

Effective prevention of domestic accidents in children includes regimental and/or legislative action, information for parents and education of the children. The latter two strategies have been applied in the deparment of the Doubs in a cooperative health promotion program. Preschool and kindergarten structures were chosen and the pedagogical project involved acquainting the children with the idea of danger by use of a kit prepared by the "Comité Français d'Education pour la Santé" (French Committee for health education). This study was set up in two stages: "experimental" in 2 schools (1983-1984) and "operational" in 40 schools (1984-1985). In order to evaluate it, the population was divided into a control group and an experimental group. A total of 5,720 tests were carried out among 520 children. 494 parents and 82 teachers answered the questionnaires sent to them. The teachers were generally very positive about the effectiveness of education about dangers and the teaching activities which could be employed: discovery of environment, awareness of body, a.s.o. The changes in attitude were real and enduring among children. The parents changed their behavior significantly concerning the storing of poisonous products (medicines and household cleaning products), which allows to feel that this program can be effective in terms of risk reduction.

Accidents, Home↗