CONSIDERABLE indirect evidence, associating serotonin with central nervous system function and the actions of important psychotropic drugs, led to suggestions192 of a relationship between serotonin metabolism and schizophrenia. Despite considerable effort, experimental support for this suggestion has been inconclusive. Among studies in this area are those on quantitative excretion, and variabil...

The effects of administration of drug combinations on uric acid excretion were studied in order to test the hypothesis that a portion of renal tubular reabsorption of uric acid occurs distal to the uric acid secretory site. Oral administration of pyrazinamide (3 g) during probenecid uricosuria (probenecid 500 mg every 6 h) decreased urate excretion from 463 mug/min following probenecid medicati...

1. The metabolic consequences of chronic ethanol feeding was investigated by assay of urinary metabolites. Male Wistar rats were fed a liquid diet containing 35% of total energy as ethanol or isovolumetric, isocaloric and isonitrogenous amounts of the same diet in which ethanol was substituted by isocaloric glucose (controls). 2. At 6 weeks the entire skeletal muscle mass was reduced by approxi...

OBJECTIVE To obtain regional reference values for calcium, uric acid and citrate urinary excretion and establish a correlation between those excretions in 24-hour urine sample and single urine sample for their use in clinical practice. METHODS A hundred and twenty-five healthy children and adolescents were randomly chosen and submitted to the following protocol: clinical examination, biochemi...

BACKGROUND/AIMS Uric acid nephrolithiasis is prevalent among patients with type 2 diabetes and metabolic syndrome; it is correlated with an acidic urine and lower urinary ammonium excretion and is likely associated with insulin resistance. Insulin stimulates ammoniagenesis in renal cell lines via increased phosphate-dependent glutaminase (PDG) activity and glutamine metabolism. Ammonium excreti...