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Related Experiment Videos

Intestinal enzyme distribution after supralethal irradiation

A Becciolini, G B Gerber, A Buracchi

    Strahlentherapie
    |July 1, 1977
    PubMed
    Summary

    Radiation impacts intestinal enzymes differently. Brush border enzymes decrease, while lysosomal enzymes like beta glucuronidase increase after irradiation, affecting intestinal tissue and immune cell presence.

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    Area of Science:

    • Gastroenterology
    • Radiation Biology
    • Enzymology

    Background:

    • Intestinal enzymes play crucial roles in digestion and nutrient absorption.
    • Ionizing radiation can cause significant damage to the gastrointestinal tract.
    • Understanding enzyme activity changes post-irradiation is vital for assessing intestinal injury.

    Purpose of the Study:

    • To investigate the activity changes of specific intestinal enzymes following 2 kR irradiation.
    • To correlate enzymatic alterations with histological changes in the intestinal epithelium.
    • To differentiate the response of brush border enzymes versus lysosomal enzymes.

    Main Methods:

    • Enzyme activity assays were performed on intestinal samples at 20 and 72 hours post-irradiation.
    • Key enzymes studied include maltase, leucine aminopeptidase (LAP), acid phosphatase, and beta glucuronidase.
    • Histological examination of intestinal tissue was conducted to assess epithelial and stromal changes.

    Main Results:

    • Brush border enzymes (maltase, LAP) initially increased at 20 hours but significantly decreased by 72 hours.
    • Lysosomal enzymes showed varied responses: acid phosphatase increased at 72 hours, while beta glucuronidase increased significantly at 20 and 72 hours.
    • Histology revealed crypt alterations at 20 hours and widespread epithelial damage with leukocyte infiltration at 72 hours.

    Conclusions:

    • Intestinal enzyme activity is differentially affected by 2 kR irradiation, with distinct patterns for brush border and lysosomal enzymes.
    • Enzymatic changes correlate with the severity of radiation-induced histological damage and inflammatory response.
    • These findings highlight the complex biochemical and structural consequences of radiation on the intestinal mucosa.

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