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Human milk lipids bind Shiga toxin.

I Herrera-Insua1, H F Gomez, V A Diaz-Gonzalez

  • 1University of Texas Medical School, Department of Pediatrics, Houston 77030, USA.

Advances in Experimental Medicine and Biology
|January 15, 2002
PubMed
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Human milk contains lipids and secretory IgA (sIgA) that bind Shiga toxin. These components, particularly lipids, may protect infants from Shiga toxin-associated hemolytic uremic syndrome by neutralizing the toxin.

Area of Science:

  • Microbiology
  • Immunology
  • Pediatrics

Background:

  • Hemolytic uremic syndrome (HUS) is a severe complication of Shiga toxin-associated diarrhea, rarely occurring in infants under six months.
  • Human milk contains potential protective factors, including Gb3 (Shiga toxin receptor) and toxin-specific secretory IgA (sIgA).

Purpose of the Study:

  • To investigate the relative importance of human milk's glycolipid and toxin-specific sIgA components in binding Shiga toxin.
  • To compare toxin-binding capacities in human milk from populations with differing Shiga toxin exposure frequencies.

Main Methods:

  • Human milk samples from Boston and Buenos Aires were fractionated into aqueous (antibody-rich) and cream (glycolipid-rich) layers.
  • Purified Shiga toxin was incubated with milk fractions, and free toxin levels were quantified using enzyme immunoassay.

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Main Results:

  • Cream fractions from both Argentinian and Bostonian milk samples demonstrated high Shiga toxin binding (85-86%).
  • The soluble fraction from Argentinian milk (high Shiga toxin exposure) bound significantly more toxin (48%) than the fraction from Boston (30%).

Conclusions:

  • Toxin-binding lipids in human milk are biologically active and likely contribute to its protective effects against Shiga toxin.
  • In populations with frequent Shiga toxin exposure, both immune (sIgA) and non-immune (lipid) factors in human milk offer protection. In low-exposure populations, milk lipids are the primary toxin-binding agents.