New Study: Maternal Antibodies Can "Program" Offspring's Oral Immunity, Potentially Influencing Periodontitis Risk A new study suggests that maternal antibodies can "program" the oral immuni…

Source: "Maternal antibodies regulate the establishment of murine oral and salivary mucosal immunity"

DentalGoodNews｜In April 2026, a research team led by Professor Avi-Hai Hovav from the Faculty of Dental Medicine at the Hebrew University of Jerusalem (HUJI) published a study in Nature Communications, revealing the critical role of maternal antibodies in shaping lifelong oral immune health in offspring. The study found that immunoglobulin G (IgG) transmitted by mothers during pregnancy and lactation not only provides short-term protection but also establishes oral immune tolerance and promotes epithelial development in early infancy through "immune programming," thereby effectively reducing the risk of periodontitis in adulthood.

Using a mouse model, the research team detailed two parallel pathways of maternal immune protection. First, IgG antibodies transmitted via the placenta during pregnancy (in utero-derived IgG) can enter the neonatal salivary glands and be secreted into saliva. This process functions to establish early "immune tolerance," teaching the developing immune system to recognize commensal microorganisms. Offspring lacking such antibodies exhibited excessive activation of salivary T cells and B cells, leading to significantly increased susceptibility to periodontitis in adulthood, accompanied by more severe inflammation and bone loss.

Second, antibodies transmitted through breast milk are responsible for promoting the physical maturation of the oral mucosal barrier. Experiments observed that antibodies in breast milk help regulate the timing of "barrier closure" in the oral epithelium. If milk antibodies are absent or disrupted by antibiotic exposure, oral epithelial integrity is compromised, barrier function weakens, and the risk of bacterial invasion increases. This finding further supports the recommendations of the World Health Organization and the UK National Health Service (NHS) for exclusive breastfeeding, demonstrating that breast milk plays a key role beyond nutrition in establishing the oral immune environment.

Notably, the study clarified that maternal IgG exhibits high specificity for Pasteurellaceae bacteria, a family closely associated with aggressive periodontitis. This suggests the potential for targeted prevention through maternal intervention. Compared to previously reported "gene brake" technologies targeting periodontitis pathogens, maternal immune programming represents a new approach to intervention at the developmental source.

Previous studies have explored the impact of maternal vitamin D levels on the risk of dental caries in offspring. This study expands the focus to the more complex field of immune shaping. Professor Hovav proposed that in the future, maternal immunization during pregnancy could be used to enhance the specific antibodies transmitted to children, serving as a potential strategy for preventing chronic oral infections.

However, the researchers also cautioned that since all conclusions are currently based on mouse models, cross-species physiological differences mean that clinical application in humans still requires long-term follow-up and validation.