Abstract
Small doses of manganese or bilirubin administered alone to rats produce no morphologic alterations in the hepatocytes. However, combination of both treatments produced a rapid and severe decrease in bile flow that was paralleled by the appearance and aggravation of the cholestatic lesion: bile canaliculi progressively lost their microvilli; vacuolization occurred in the pericanalicular area and subsequently in the cytoplasm. When bile flow returned to normal, or when cholestasis was prevented by an injection of sulfobromophthalein or a pretreatment with phalloidin, no cholestatic signs were observed. A close correlation appears to exist between the presence of morphologic alterations and the decrease of bile flow in manganese-bilirubin cholestasis.
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