Antibody responses to Porphyromonas gingivalis outer membrane protein in the first trimester

Area of Science:

• Obstetrics and Gynecology
• Periodontology
• Immunology

Background:

• Porphyromonas gingivalis (Pg) is a key periodontal pathogen linked to adverse pregnancy outcomes like preterm birth (PTB), intrauterine growth retardation (IUGR), and pregnancy-induced hypertension (PIH).
• The association between maternal antibody response to Pg and adverse pregnancy outcomes remains debated.
• Serum C-reactive protein (CRP) is a known marker for periodontal disease.

Purpose of the Study:

• To investigate the role of antibody responses to Porphyromonas gingivalis (Pg) in the first trimester of pregnancy concerning adverse pregnancy outcomes.
• To determine the significance of maternal IgG1 antibody levels against the 40-kDa outer membrane protein of Pg in relation to PTB, IUGR, and PIH.

Main Methods:

• A case-control study involving pregnant women with PTB (n=58), IUGR (n=91), PIH (n=32), and healthy controls (n=98).
• Measurement of serum C-reactive protein (CRP) levels.
• Quantification of serum IgG1 antibodies against the 40-kDa outer membrane protein of Pg (anti-40-kDa OMP Pg-IgG1) during the first trimester.

Main Results:

• Lower levels of anti-40-kDa OMP Pg-IgG1 were observed in women with IUGR.
• Reduced anti-40-kDa OMP Pg-IgG1 levels were also found in PTB patients with chorioamnionitis or specific vaginal flora (Lactobacilli).
• No significant difference in serum CRP levels was found between case groups and the control group.

Conclusions:

• A diminished humoral immune response to Porphyromonas gingivalis in early pregnancy is associated with an increased risk of intrauterine growth retardation (IUGR).
• Low antibody levels against Pg may also be linked to certain cases of preterm birth (PTB).
• The findings highlight the potential role of early pregnancy immunity in preventing specific adverse pregnancy outcomes.