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Updated: Mar 30, 2026
A Murine Model of Group B Streptococcus Vaginal Colonization
Published on: November 16, 2016
Immunomodulation of Lactobacillus reuteri CRL1324 on Group B Streptococcus Vaginal Colonization in a Murine
Priscilla Romina De Gregorio1, María Silvina Juárez Tomás1, María Elena Fátima Nader-Macías1
1Centro de Referencia Para Lactobacilos (CERELA)-CONICET, San Miguel de Tucumán, Tucumán, Argentina.
Problem:
Maternal Group B Streptococcus (GBS) colonization is a risk factor for infectious disease in newborns. One promising strategy is the modulation of vaginal defense to increase the host's ability to combat infection.
Method Of Study:
The effect of intravaginal (i.va.) Lactobacillus reuteri CRL1324 inoculation on different immune cell populations, cytokines, and immunoglobulin isotypes in a murine model of GBS vaginal colonization was evaluated.
Results:
Seven i.va. inoculations of L. reuteri CRL1324 previous to GBS challenge showed an immunomodulatory effect on the cells and mediators of innate immunity, decreasing the number of neutrophils induced by the pathogen and increasing the activated macrophage population. Moreover, increases in B lymphocytes and IgA and IgG subclasses were observed in mice inoculated with L. reuteri CRL1324 and then challenged with GBS.
Conclusion:
Lactobacillus reuteri CRL1324 shows a protective effect against GBS colonization that could be mediated by the modulation of the immune response.
