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Simultaneous exposure to aflatoxin B1 (AFB1) and aflatoxin M1 (AFM1) damages intestinal barrier function. AFM1 worsens AFB1 effects, indicating potential risks from these common food contaminants.

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Area of Science:

  • Toxicology
  • Gastroenterology
  • Food Safety

Background:

  • Humans face simultaneous exposure to dietary aflatoxin B1 (AFB1) and aflatoxin M1 (AFM1).
  • The intestine is a primary defense against contaminants, but combined AFB1/AFM1 effects on intestinal integrity are unknown.

Purpose of the Study:

  • To investigate the combined effects of AFB1 and AFM1 on intestinal integrity.
  • To elucidate the mechanisms underlying AFB1 and AFM1-induced intestinal damage.

Main Methods:

  • In vivo studies in mice assessing serum biochemistry, villus height/crypt depth, and tight junction protein distribution.
  • In vitro studies using Caco-2 cells to evaluate cell viability, transepithelial electrical resistance, and paracellular permeability.
  • Investigated the role of clathrin-mediated endocytosis using chlorpromazine.

Main Results:

  • Both AFB1 and AFM1 impaired intestinal barrier function individually and in combination, decreasing cell viability and resistance while increasing permeability.
  • AFM1 exacerbated AFB1-induced intestinal damage, characterized by tight junction protein downregulation and internalization.
  • Clathrin-mediated endocytosis partially contributed to the observed intestinal barrier dysfunction.

Conclusions:

  • Combined AFB1 and AFM1 exposure negatively impacts intestinal integrity.
  • AFM1 potentiates AFB1 toxicity, suggesting synergistic or additive adverse effects on human health.
  • Understanding these interactions is crucial for assessing risks associated with dietary aflatoxin co-exposure.