F Wahbe

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BACKGROUND Several halogenated anesthetics induce a urinary concentrating defect, partly related to fluoride ion toxicity in collecting duct cells. The aim of this study was to investigate the effects of fluoride ion in human kidney cells. METHODS Immortalized human collecting duct cells were used. In a first set of experiments, the toxicity threshold(More)
In 30 normal subjects, the mean (+/- SEM) plasma concentration of PRL was 5.90 +/- 0.40 ng/ml and that of PTH was 0.51 +/- 0.03 ng/ml. There was no significant difference in plasma hormone levels according to age or sex. Ten cases of primary hyperparathyroidism showed PRL concentrations (8.90 +/- 1.80 ng/ml) significantly (P less than 0.01) higher than(More)
Abnormalities in glomerular function have been observed frequently in the early stages of both clinical and experimental diabetes mellitus. Because prostaglandins (PGs) are present in the glomerulus and have profound effects on glomerular hemodynamics, and because abnormalities of PG metabolism have been noted in other tissues from diabetics, we studied PG(More)
We have examined the intracellular accumulation and the release of cGMP and cAMP from the apical and basolateral poles of SV40-transformed human glomerular visceral epithelial cells (HGVEC) cultured on filters. After treatment of the cells by atrial natriuretic peptide (ANP), cGMP did not accumulate in the cells and was rapidly released mainly into the(More)
The dopamine content of either cortical slices or isolated glomeruli prepared from rat kidneys and of their incubation medium was measured at different times both under basal conditions and in the presence of L-DOPA. Production of dopamine from L-DOPA by purified cytosolic proteins of the whole cortex was also measured. Dopamine synthesized by these 3 renal(More)
Synthesis of dopamine (DA) was studied in cortical slices of Sprague-Dawley (SD) rat kidneys incubated with L-DOPA (10(-6) M). In morphological studies, formaldehyde-induced histofluorescent deposits were detected at the apical pole of the convoluted parts of the proximal tubules. Elsewhere along the nephron, no positive reaction appeared. DOPA(More)
Tritiated salmon calcitonin was prepared by methylation of the free amino groups using tritiated sodium borohydride as precursor. Specific radioactivity was measured in competitive inhibition studies with specific anticalcitonin antibodies or tubular membranes as binding sites for calcitonin. The value observed, approx. 4 Ci/mmol, corresponded to(More)
The relative contributions of Na(+)-K(+)-ATPase pumps and Na(+)-K(+)-Cl- cotransport to total rubidium (Rb+) influx into primary cultures of renal tubule cells (PC.RC) and cells transformed either with the wild-type or a temperature-sensitive mutant of the simian virus 40 (SV40), were measured under various growth conditions. The Na(+)-K(+)-ATPase-mediated(More)