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Human milk kills parasitic intestinal protozoa
Abstract:
Giardia lamblia, a common pathogenic intestinal parasite of humans, was rapidly killed by exposure to normal human milk in vitro. The killing did not depend on secretory immunoglobulin A. Entamoeba histolytica, the dysentery amoeba, was also killed by normal human milk. Giardia-cidal activity cochromatographed with an unusual lipase that is present in the milk of humans but not of lower mammals. Human milk may play a protective role in infants exposed to this parasite.
Insights
Human milk effectively kills Giardia lamblia and Entamoeba histolytica, common intestinal parasites. This protective effect is linked to a unique human milk lipase, not secretory immunoglobulin A, suggesting a role in infant protection.
Area of Science:
- Microbiology
- Immunology
- Gastroenterology
Background:
- Giardia lamblia and Entamoeba histolytica are significant human intestinal pathogens.
- Infant nutrition and protection against enteric infections are critical public health concerns.
Purpose of the Study:
- To investigate the in vitro efficacy of human milk against Giardia lamblia and Entamoeba histolytica.
- To identify the component(s) in human milk responsible for parasiticidal activity.
Main Methods:
- In vitro exposure of Giardia lamblia and Entamoeba histolytica to normal human milk.
- Assays to determine the role of secretory immunoglobulin A (sIgA).
- Cochromatography to isolate the active component.
Main Results:
- Normal human milk rapidly killed both Giardia lamblia and Entamoeba histolytica.
- The killing activity was independent of secretory immunoglobulin A.
- The parasiticidal activity cochromatographed with a lipase unique to human milk.
Conclusions:
- Human milk possesses potent in vitro activity against key intestinal parasites.
- A human milk-specific lipase is likely responsible for the observed Giardia-cidal and Entamoeba-cidal effects.
- Human milk may offer crucial protection to infants against these common parasitic infections.