Drug-induced cholestasis

Area of Science:

• Hepatology
• Gastroenterology
• Toxicology

Background:

• Intrahepatic cholestasis is characterized by impaired bile flow within the liver.
• It presents with biochemical, clinical, and morphological features similar to extrahepatic obstruction.
• Causes include hepatocyte lesions (canalicular, hepatocanalicular, hepatocellular) and ductal lesions.

Purpose of the Study:

• To elucidate the mechanisms and sites of injury in intrahepatic cholestasis.
• To review the causes, particularly drug-induced cholestasis.
• To describe the clinical manifestations and variations in drug-induced liver injury.

Main Methods:

• Review of literature on intrahepatic cholestasis and drug-induced liver injury.
• Analysis of mechanisms involving bile acid-dependent and independent flow.
• Identification of cellular and subcellular sites of damage.

Main Results:

• Defective bile flow can stem from impaired bile acid transport, altered canalicular function, or ductal injury.
• Key sites of injury include plasma membranes, tight junctions, and the pericanalicular network.
• Various drugs and chemical agents can induce cholestasis through distinct injury pathways.

Conclusions:

• Intrahepatic cholestasis arises from complex defects in bile formation and transport.
• Drug-induced cholestasis is a significant clinical entity, presenting acutely or chronically.
• Understanding the sites of injury is crucial for diagnosing and managing cholestatic liver diseases.