Cândido Hipólito-Reis

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OBJECTIVE To investigate the effect of inhibitors of alkaline phosphatase (ALP) and modulators of P-glycoprotein (Pgp), multidrug resistance protein (MRP) and hepatic taurocholate uptake on the activity of tissue-nonspecific ALP (TNALP) in liver and kidney. DESIGN AND RESULTS ALP activity was determined in rat liver and kidney homogenates. Levamisole had(More)
The aim of this study was to investigate the role of phosphorylation/dephosphorylation mechanisms at the blood-brain barrier (BBB) in the uptake of organic cations. The experiments were performed using RBE4 cells, an immortalized, rat brain microvessel endothelial cell line, an in vitro model of the BBB. The modulation of the uptake of(More)
1. The liver has an important role in the detoxification of organic cations from the circulation. [3H]-1-methyl-4-phenylpyridinium ([3H]-MPP+), a low molecular weight organic cation, is efficiently taken up and accumulated by rat hepatocytes through mechanisms partially unknown. 2. The aim of the present work was to characterize further the uptake of MPP+(More)
Alkaline phosphatases (orthophosphoric-monoester phosphohydrolase, E. C. are a group of nonspecific phosphomonoesterases located primarily in the plasma membrane of the cells in which they occur [1]. It was recently demonstrated that alkaline phosphatase (ALP) concentration in different tissues is positively correlated with the extent of exchange(More)
The ultrastructural and biochemical changes produced by 4-aminopyrazolo[3,4-d]pyrimidine (4-APP), on zona fasciculata cells of rat adrenal cortex are described. Male rats weighing approximately 200 g were injected intraperitoneally with 50 mg/kg/day of 4-APP for 3 days; the controls were injected with buffer. All animals were sacrificed on the 4th day and(More)
The effect of feeding, starvation and fibre ingestion on alkaline phosphatase (ALP) activity (E.C. was studied in Wistar rat serum. Using identical assay conditions for total ALP activity determination and for electrophoretic ALP isoenzymes/fractions activity calculation, alpha- and beta-naphthyl phosphates and p-nitrophenyl phosphate were used as(More)
Recent studies on the intestinal uptake of the organic cation 1-methyl-4-phenylpyridinium (MPP+) showed that transport of this compound occurs through human extraneuronal monoamine transporter (hEMT). Moreover, it was recently described that alkaline phosphatase (ALP), an ecto-phosphatase anchored to the plasma membrane and able to dephosphorylate(More)
Previous studies have demonstrated that the small permanently charged organic cation 1-methyl-4-phenylpyridinium (MPP+) is avidly taken up by rat hepatocytes. The aim of this study was to characterise the postnatal development of hepatic uptake of organic cations, using the model compound MPP+. Accumulation of [3H]MPP+ by liver slices obtained from rats(More)
Previous studies have demonstrated that the organic cation 1-methyl-4-phenylpyridinium (MPP+) is avidly taken up by rat freshly isolated hepatocytes through at least two distinct transport mechanisms: the type I hepatic transporter of organic cations and P-glycoprotein. In this study, the effects of extrahepatic cholestasis induced by bile duct ligation for(More)