BackgroundMore than one million new cases of sexually transmitted diseases (STDs) occur
each day. The immune responses and inflammation induced by STDs and other
frequent non-STD microbial colonizations (i.e. Candida and bacterial
vaginosis) can have serious pathologic consequences in women including
adverse pregnancy outcomes, infertility and increased susceptibility to
infection by other pathogens. Understanding the types of immune mediators
that are elicited in the lower genital tract by these
infections/colonizations can give important insights into the innate and
adaptive immune pathways that are activated and lead to strategies for
preventing pathologic effects.Methodology/Principal Findings32 immune mediators were measured by multiplexed immunoassays to assess the
immune environment of the lower genital tract mucosa in 84 women attending
an urban STD clinic. IL-3, IL-1ß, VEGF, angiogenin, IL-8,
ß2Defensin and ß3Defensin were detected in all subjects,
Interferon-α was detected in none, while the remaining mediators were
detected in 40% to 93% of subjects. Angiogenin, VEGF, FGF,
IL-9, IL-7, lymphotoxin-α and IL-3 had not been previously reported in
genital mucosal fluid from women. Strong correlations were observed between
levels of TNF-α, IL-1ß and IL-6, between chemokines IP-10 and MIG
and between myeloperoxidase, IL-8 and G-CSF. Samples from women with any
STD/colonization had significantly higher levels of IL-8, IL-3, IL-7,
IL-1ß, lactoferrin and myeloperoxidase. IL-1ß and lactoferrin
were significantly increased in gonorrhea, Chlamydia,
cervicitis, bacterial vaginosis and trichomoniasis.Conclusions/SignificanceThese studies show that mucosal fluid in general appears to be an environment
that is rich in immune mediators. Importantly, IL-1ß and lactoferrin
are biomarkers for STDs/colonizations providing insights into immune
responses and pathogenesis at this mucosal site.