Calcium transport in isolated rat hepatocytes

Transport and metabolism of thiamin in isolated rat hepatocytes.

This study examines thiamin transport in isolated rat hepatocytes and its relationship to thiamin phosphorylation. In an Na+ medium, [35S]thiamin, 3 microM, was accumulated rapidly by the cells, and a near study state intra-/extracellular distribution ratio of 3 was attained in 1 min. However, the uptake of radioactivity continued to increase with time owing principally to the accumulation of [...

Metabolism and Cytotoxic Mechanisms of Nitroglycerin in Isolated Rat Hepatocytes

     It has been proposed that organic nitrates such as glyceryl trinitrate (GTN), used in the treatment of cardiovascular diseases, act by producing nitric oxide (NO). However, the biochemical pathway for NO formation from GTN is not well understood. In the present study, we showed that nitrate formation from GTN, by isolated rat hepatocytes, was inhibited about 50% when cellular glutathione w...

Hemopexin-mediated transport of heme into isolated rat hepatocytes.

A regulatory calcium-binding site for calcium channel in isolated rat hepatocytes.

Loading isolated rat hepatocytes with high concentrations of the fluorescent Ca2+-chelator quin-2 in the absence of extracellular Ca2+ decreases by about 3-fold the cytosolic Ca2+ concentration ([Ca2+]i). In these low [Ca2+]i cells, the initial 45Ca2+ uptake rate, assumed to represent the Ca2+ influx, is stimulated to a level close to that promoted by maximal doses of vasopressin and angiotensi...

Mechanisms underlying calcium homeostasis in isolated hepatocytes.

The steady state relationship between intra- and extramitochondrial free Ca2+ across the inner mitochondrial membrane has been investigated in isolated liver mitochondria. The extramitochondrial free Ca2+ concentration was essentially independent of the mitochondrial calcium content above 4 nmol/mg of protein. Below this value, a decrease in the mitochondrial calcium content was accompanied by ...