Progesterone promotes CXCl2-dependent vaginal neutrophil killing by activating cervical resident macrophage-neutrophil crosstalk

Vaginal infections in women of reproductive age represent a clinical dilemma with significant socioeconomic implications. The current understanding of mucosal immunity failure during early pathogenic invasions that allows the pathogen to grow and thrive is far from complete. Neutrophils infiltrate m...

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Bibliographic Details
Published in:JCI insight 2024-10, Vol.9 (20)
Main Authors: Gómez-Oro, Carla, Latorre, Maria C, Arribas-Poza, Patricia, Ibáñez-Escribano, Alexandra, Baca-Cornejo, Katia R, Gallego-Valle, Jorge, López-Escobar, Natalia, Mondéjar-Palencia, Mabel, Pion, Marjorie, López-Fernández, Luis A, Mercader, Enrique, Pérez-Milán, Federico, Relloso, Miguel
Format: Article
Language:English
Subjects:
Animals
Cervix Uteri - cytology
Cervix Uteri - immunology
Chemokine CXCL2 - metabolism
Female
Immunity, Mucosal
Macrophages - immunology
Macrophages - metabolism
Mice
Mice, Inbred C57BL
Neutrophils - immunology
Neutrophils - metabolism
Progesterone - pharmacology
Vagina - immunology
Vagina - microbiology
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Summary:Vaginal infections in women of reproductive age represent a clinical dilemma with significant socioeconomic implications. The current understanding of mucosal immunity failure during early pathogenic invasions that allows the pathogen to grow and thrive is far from complete. Neutrophils infiltrate most tissues following circadian patterns as part of normal repair, regulation of microbiota, or immune surveillance and become more numerous after infection. Neutrophils are responsible for maintaining vaginal immunity. Specific to the vagina, neutrophils continuously infiltrate at high levels, although during ovulation, they retreat to avoid sperm damage and permit reproduction. Here we show that, after ovulation, progesterone promotes resident vaginal macrophage-neutrophil crosstalk by upregulating Yolk sac early fetal organs (FOLR2+) macrophage CXCl2 expression, in a TNFA-patrolling monocyte-derived macrophage-mediated (CX3CR1hiMHCIIhi-mediated) manner, to activate the neutrophils' capacity to eliminate sex-transmitted and opportunistic microorganisms. Indeed, progesterone plays an essential role in conciliating the balance between the commensal microbiota, sperm, and the threat of pathogens because progesterone not only promotes a flurry of neutrophils but also increases neutrophilic fury to restore immunity after ovulation to thwart pathogenic invasion after intercourse. Therefore, modest progesterone dysregulations could lead to a suboptimal neutrophilic response, resulting in insufficient mucosal defense and recurrent unresolved infections.
ISSN:2379-3708
2379-3708
DOI:10.1172/jci.insight.177899