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Related Experiment Videos

Human intestinal glutathione S-transferases.

W H Peters1, H M Roelofs, F M Nagengast

  • 1Division of Gastrointestinal and Liver Diseases, St. Radboud University Hospital, Nijmegen, The Netherlands.

The Biochemical Journal
|January 15, 1989
PubMed
Summary

Researchers purified cytosolic glutathione S-transferases from human intestines. They found distinct subunit compositions and acidic isoenzymes in the large intestine, differing from the small intestine and liver.

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Area of Science:

  • Biochemistry
  • Gastroenterology
  • Molecular Biology

Background:

  • Cytosolic glutathione S-transferases (GSTs) are crucial for detoxification.
  • Understanding GST heterogeneity in the human gastrointestinal tract is important for cellular protection.

Purpose of the Study:

  • To purify and characterize cytosolic glutathione S-transferases from human small and large intestines.
  • To compare the subunit composition, isoenzyme profiles, and specific activities of intestinal GSTs with hepatic GSTs.

Main Methods:

  • Purification of cytosolic glutathione S-transferases from human small and large intestinal epithelial cells.
  • Characterization using specific activity assays, SDS-PAGE for subunit analysis, and isoelectric focusing for isoenzyme separation.

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Main Results:

  • Intestinal GSTs exhibited varying subunit compositions (24 and 25 kDa in small intestine, predominantly 24 kDa in large intestine) compared to hepatic GSTs (mainly 25 kDa).
  • Isoelectric focusing revealed distinct isoenzyme profiles: liver GSTs were basic/neutral, small intestine GSTs were basic/neutral/acidic, and large intestine GSTs were primarily acidic (likely GST Pi).
  • A significant decrease in GST specific activity was observed from the small to the large intestine, with potential age-related decline in the ascending colon.

Conclusions:

  • Human intestinal glutathione S-transferases display distinct biochemical properties compared to hepatic enzymes.
  • The presence of acidic isoenzymes, particularly GST Pi, is characteristic of the large intestine.
  • GST activity decreases along the gastrointestinal tract, suggesting regional differences in detoxification capacity.