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Antigenic Liposomes for Generation of Disease-specific Antibodies

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Published on: October 25, 2018

Lactobacillus casei Shirota does not decrease the food allergic response to peanut extract in Brown Norway rats.

Jonathan D de Jonge¹, Janine Ezendam, Léon M J Knippels

¹Maastricht University, Department of Health Risk Analysis and Toxicology, Maastricht, The Netherlands. j.dejonge@grat.unimaas.nl

|June 6, 2008

Summary

This study found that Lactobacillus casei Shirota (LcS) did not prevent peanut allergy in rats. LcS modulated immune responses but did not down-regulate the allergic reaction, challenging its efficacy in allergy prevention.

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Area of Science:

Immunology
Microbiology
Gastroenterology

Background:

Probiotics, like Lactobacillus casei Shirota (LcS), are investigated for immune modulation and allergy prevention.
The efficacy of probiotics in preventing allergies remains controversial and requires further investigation.

Purpose of the Study:

To investigate the effect of Lactobacillus casei Shirota (LcS) on modulating food allergic responses to peanut extract (PE) in Brown Norway (BN) rats.
To determine if LcS administration can prevent or down-regulate a peanut-induced allergic response in a rat model.

Main Methods:

Brown Norway (BN) rats were sensitized to peanut extract (PE) via oral gavage.
Experimental groups received daily oral doses of LcS (1 x 10^9 colony forming units/rat/day).
Immune responses, including specific antibody levels (IgG1, IgG2a, IgE), cytokine production (IFN-gamma, IL-4), and basophil counts, were analyzed.

Main Results:

LcS had minimal effects on non-sensitized animals.
In PE-sensitized rats, LcS shifted the Th1/Th2 ratio towards Th2 dominance and increased PE-specific IgG2a and basophil counts.
While LcS increased Th1 and Th2 cytokines (IFN-gamma and IL-4), IL-4 levels were predominantly elevated in spleen and mesenteric lymph node cells.

Conclusions:

The study does not support the hypothesis that LcS down-regulates food allergic responses in this rat model.
LcS modulated immune responses but did not prevent or reduce the severity of peanut allergy in BN rats.
Further research is needed to understand the complex interactions between probiotics and the immune system in allergy development.