Vaginal cytokines in normal pregnancy

Area of Science:

• Reproductive immunology
• Maternal-fetal medicine
• Vaginal microbiome research

Background:

• Vaginal cytokine concentrations are crucial for mucosal immunity.
• Understanding cytokine dynamics during pregnancy is essential for assessing infection risk.
• Previous research has not fully elucidated pregnancy-specific changes in vaginal cytokine profiles.

Purpose of the Study:

• To investigate variations in vaginal cytokine concentrations throughout uncomplicated pregnancy.
• To compare cytokine levels in pregnant women with non-pregnant controls.

Main Methods:

• Vaginal washings were collected from 30 healthy pregnant women and 62 non-pregnant controls.
• Levels of key cytokines including IL-6, IL-8, IL-1β, IL-1RA, LIF, and TNF were measured.
• Statistical analyses included Kruskal-Wallis, Welch tests, and Spearman rank test.

Main Results:

• Interleukin-1 receptor antagonist (IL-1RA) was depressed during pregnancy compared to non-pregnant controls.
• Vaginal interleukin-6 (IL-6) and interleukin-8 (IL-8) levels were lower and dipped mid-pregnancy, returning to baseline in the third trimester.
• Leukemia inhibitory factor (LIF) was lower early in pregnancy, while tumor necrosis factor (TNF) showed no significant difference.

Conclusions:

• Vaginal cytokine profiles, particularly IL-1RA, IL-6, and IL-8, exhibit significant differences and fluctuations during normal pregnancy.
• These pregnancy-associated cytokine variations are critical considerations for interpreting mucosal immune responses to lower genital tract infections.