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Biomedical subjects

B Grenier

Publications and source records attributed to B Grenier.

At least 73 records · Page 4Linked to original sources
PubMed1980

[Bartter's syndrome: seven cases in siblings. Hypothesis of mild forms (author's transl)].

Three children with a Bartter's syndrome have been investigated: all of them had growth retardation, hypokalemia (less than 3 mmol/l), raised plasma renin activity and urinary prostaglandins (PGE2 and PGF2 alpha) and a decreased sensibility for angiotensin. In the siblings two children had also growth retardation with mild biological signs of Bartter's syndrome, and two children had normal growth slight hypokalemia raised RPA and urinary PH, and normal sensibility for angiotensin. These data suggest mild forms of this syndrome which could be the Bartter's syndrome diagnosed in adults after laxatives or diuretics absorption. Besides these data stated a negative correlation (p less than 0,01) between plasma K+ and RPA, negative correlation (p less than 0,01) between plasma K+ and urinary PGE2 and a positive correlation (p less than 0,01) between RPA and urinary PGE2. From these observations physiopathology of Bartter's syndrome is discussed.

Adolescent↗
PubMed1979

[Hepatitis A of children. Seroepidemiological study among French urban population (author's transl)].

A prevalence survey of hepatitis A antibody (anti-HAV) was conducted among 145 children living in the area of Tours (France). Thirty-four per cent of children's sera was found anti-HAV positive when tested by both immune adherence hemagglutination assay (IAHA) and specific radio-immunoassay (RIA). The prevalence of anti-HAV among infants less than one year and children between 1 to 5 years, was 35 per cent and 15 per cent respectively. From 6 years old, the prevalence of anti-HAV increased abruptly and reached 47 per cent in the 11 to 15 age group. Anti-HAV titers as measured by IAHA also increased according to age. In this study, the prevalence of anti-HAV was not related to sex, history of past surgery and/or blood transfusions. Only 12 per cent of children with anti-HAV positive test had history of jaundice. These results show that, in France, primary contact with hepatitis A virus (HAV) appear early in childhood, at school age, and that in children more than 80% of HAV infections remain asymptomatic.

Adolescent↗
PubMed1979

Pyruvate dehydrogenase, lipoamide dehydrogenase and citrate synthase activity in fibroblasts from patients with Friedreich's and Charlevoix-Saguenay ataxia.

The activity of lipoamide dehydrogenase and two closely related enzymes was studied simultaneously in early, mild, and late passage fibroblast cultures. Friedreich's ataxia fibroblasts tended to lose pyruvate dehydrogenase and citrate synthase activities, while lipoamide dehydrogenase activity remained constant with aging of the cells. Mean pyruvate dehydrogenase activity was lower over-all in fibroblasts from ataxics. Mean citrate synthase activity was higher in ataxic fibroblasts. Present tissue culture media do not represent the best conditions in which to reproduce cofactor binding defects such as those found in other genetic diseases with structural enzyme mutations.

Ataxia↗
PubMed1979

Dicarboxylic amino acid uptake in normal, Friedreich's ataxia, and dicarboxylic aminoaciduria fibroblasts.

Glutamic and aspartic acid uptake was measured in skin fibroblasts from patients with Friedreich's Ataxia, dicarboxylic aminoaciduria, and normal individuals. The results showed no difference in uptake kinetics of either dicarboxylic amino acids between Friedreich's Ataxia and normal cells, but reduced uptake velocities in dicarboxylic aminoaciduria fibroblasts. Friedreich's Ataxia fibroblasts were, however, less calcium-dependent and more magnesium and phosphate-dependent than controls in glucose-free incubation mixture. This difference might be related to some degree of glucose intolerance by Friedreich's Ataxia fibroblasts in culture.

Amino Acids↗
PubMed1978

Lipoamide dehydrogenase in Friedreich's ataxia fibroblasts.

Lipoamide dehydrogenase was measured in cultivated skin fibroblasts from twelve patients with Friedreich's ataxia and nine normal controls. No difference in specific activity, subcellular distribution and Vmax or Km was observed between patients and controls.

Cells, Cultured↗
PubMed1976

[Automatic complement fixation reaction applied to the diagnosis of influenza (author's transl)].

Auto-analysis has been adapted to the study of complement fixation on flu antigen-antibody complexes. The antigen used consists of a complete virus of strain A2/AICHI/68/H3N2 (antigen of envelope V). The advantages of this method reside in the reproducibility of the results and in instrumental reading with graphic recording and conservation of a graphical result. The recording of the percentage of hemolysis given by the auto-analyser permits calculation of the rate of the reaction K37 of complement fixation on the formed immune complex. This value is independent of temperature, time of fixation and the initial quantity of complement used. It is proportional to the quantity of specific antibody. Thus, the value of K37 is proposed as mode of expression of the results replacing the limit serum dilution.

Complement Fixation Tests↗
PubMed1975

[Salmonellosis: retrospective study of 136 cases hospitalized at the C.H.U. of Tours].

136 cases of salmonellosis were seen in the Tours Hospital Center from 1965 to 1971. Salmonella typhi produced 32 cases of typhoid fever and 2 focal infections: a bacterial pleural effusion and an osteoarthritis. Salmonella para B induced 16 cases of typhoid fever. All these 50 patients were given chloramphenicol that was effective in vitro and in vivo as well. They usually exhibited very few and mild signs or symptoms but long lasting fever. Complications were very rare. There was no death. Paradoxically, the 86 "minor" salmonellosis (i.e. caused by other Salmonella species than S. typhi, S. paratyphi A, B or C) exhibited a much more overt symptomatology. Though all the "major" salmonellosis occurred in previously healthy patients and caused no death, the "minor" salmonellosis occurred mostly in seriously ill patients and had a lethal outcome for 5 out of 86. There was no typhoid fever epidemic in Touraine during recent years. Lysotyping ruled out the hypothesis of an endemic local reservoir. On the other hand, two hospital outbreaks of "minor" salmonellosis were recognized: one in a psychiatric ward due to S. java in 1967, the other in a pediatric ward due to S. wien in 1971-1972 respectively.

Adolescent↗