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We studied the effect of dietary soybean lecithin or triacylglycerol on hepatic Na+,K(+)-ATPase in cyclosporine A-treated rats by means of quantitative immunocytochemistry. Cyclosporine A-treated rats were fed lecithin or a triacylglycerol-enriched diet or a low-fat diet. As a control, one group was only fed the low-fat diet; the three other groups were treated with cyclosporine A solvent and received the low fat, lecithin, or triacylglycerol diet. Bile canalicular staining significantly decreased in all cyclosporine A-treated groups with the higher values in lecithin-fed rats. In basolateral membranes, no decrease was observed in the lecithin-cyclosporine group, in contrast to the other groups. The triacylglycerol-cyclosporine group had lower values in both membrane domains. The alteration of Na+,K(+)-ATPase by cyclosporine A was related to cholestasis evidenced by a decrease in bile salt secretion. These modifications were prevented by dietary soybean lecithin and amplified by dietary soybean triacylglycerol.
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