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Exposure of isolated rat hepatocytes (approx. 2 x 10(7)--5 x 10(7) cells/10ml of incubation mixture) to 0.5 mg of the mycotoxin sporidesmin for 30--60 min at 37 degrees C produced loss of plasma-membrane microvilli with some disruption of organelle distribution in the sub-surface region. There was accompanying inhibition of [14C]cholate and [14C]taurocholate transport, but bile acid conjugation was not altered. Inhibition of cholate uptake was maximal after exposure of hepatocytes to sporidesmin for 1 min, and was not reversed by washing cells free of extracellular sporidesmin. N-Ethylmaleimide (0.1 mM) or dithiothreitol (1 mM) partially protected hepatocytes from sporidesmin inhibition of bile acid uptake. Significant protection was not given by other thiols or by zinc sulphate, cholesterol, ascorbate or alpha-tocopherol. The results are discussed in terms of sporidesmin action on cell membranes and the toxin's effect on bile secretion.

Inhibition by sporidesmin of hepatocyte bile acid transport