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Isolation and electrophoretic study on Mallory bodies from the livers of alcoholic cirrhosis
Abstract:
Mallory bodies (MBs) were isolated from the livers of eight alcoholic patients. The method consisted of homogenization, velocity sedimentation in 60 per cent sucrose solution and two-phase polymer centrifugation using a polyethylene glycol-dextran system. MBs were isolated in large quantity and high purity (more than 95 per cent in some cases). Isolated MBs maintained the characteristic filamentous structures. They were solubilized in 6 M guanidine hydrochloride in 10 per cent or 1 per cent acetic acid by sonication or in 1 per cent sodium dodecyl sulfate with 5 per cent 2-mercaptoethanol and 8 M urea. The solubilized MB protein produced three peaks on Sephadex G-100 chromatography and at least five intense protein bands on sodium dodecyl sulfate polyacrylamide gel electrophoresis. The fractions from control livers contained several bands which were identical with the major components of isolated MB protein. These findings suggest that MBs are not homogeneous protein, but that they are probably complexes of various proteins, and that some components of MBs are present in normal hepatocytes. The exact nature of MBs has yet to be established.
Insights
Researchers isolated Mallory bodies (MBs) from alcoholic livers, finding they are complex protein mixtures, not homogeneous. Some MB components are also present in normal liver cells, suggesting a shared origin.
Area of Science:
- Hepatology
- Biochemistry
- Cell Biology
Background:
- Mallory bodies (MBs) are protein aggregates found in hepatocytes of patients with alcoholic liver disease.
- The precise composition and origin of MBs remain incompletely understood.
Purpose of the Study:
- To isolate and characterize Mallory bodies (MBs) from human alcoholic livers.
- To investigate the protein composition of MBs and compare it to normal liver proteins.
Main Methods:
- Isolation of MBs using homogenization, velocity sedimentation, and two-phase polymer centrifugation.
- Solubilization of MBs using guanidine hydrochloride or sodium dodecyl sulfate with reducing agents and urea.
- Analysis of solubilized MB proteins by Sephadex G-100 chromatography and SDS-PAGE.
Main Results:
- High purity (over 95%) and large quantities of MBs were isolated, retaining filamentous structures.
- Solubilized MB protein yielded three peaks on Sephadex G-100 and at least five bands on SDS-PAGE.
- Identical protein bands were found in both isolated MBs and fractions from control (normal) livers.
Conclusions:
- Mallory bodies are likely heterogeneous protein complexes, not a single protein entity.
- Some protein components of MBs are also present in normal hepatocytes.
- Further research is needed to fully elucidate the exact nature and formation of Mallory bodies.