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IL-17A Is an Important Effector of the Immune Response of the Mammary Gland to Escherichia coli Infection
- Source :
- Journal of Immunology, Journal of Immunology, Publisher : Baltimore : Williams & Wilkins, c1950-. Latest Publisher : Bethesda, MD : American Association of Immunologists, 2016, 196 (2), pp.803-812. ⟨10.4049/jimmunol.1500705⟩
- Publication Year :
- 2016
- Publisher :
- HAL CCSD, 2016.
-
Abstract
- The cytokine IL-17A has been shown to play critical roles in host defense against bacterial and fungal infections at different epithelial sites, but its role in the defense of the mammary gland (MG) has seldom been investigated, although infections of the MG constitute the main pathology afflicting dairy cows. In this study, we showed that IL-17A contributes to the defense of the MG against Escherichia coli infection by using a mouse mastitis model. After inoculation of the MG with a mastitis-causing E. coli strain, the bacterial load increased rapidly, triggering an intense influx of leukocytes into mammary tissue and increased concentrations of IL-6, IL-22, TNF-α, and IL-10. Neutrophils were the first cells that migrated intensely to the mammary tissue, in line with an early production of CXCL2. Depletion of neutrophils induced an increased mammary bacterial load. There was a significant increase of IL-17–containing CD4+ αβ T lymphocyte numbers in infected glands. Depletion of IL-17A correlated with an increased bacterial colonization and IL-10 production. Intramammary infusion of IL-17A at the onset of infection was associated with markedly decreased bacterial numbers, decreased IL-10 production, and increased neutrophil recruitment. Depletion of CD25+ regulatory T cells correlated with a decreased production of IL-10 and a reduced bacterial load. These results indicate that IL-17A is an important effector of MG immunity to E. coli and suggest that an early increased local production of IL-17A would improve the outcome of infection. These findings point to a new lead to the development of vaccines against mastitis.
- Subjects :
- 0301 basic medicine
medicine.medical_treatment
Immunology
Enzyme-Linked Immunosorbent Assay
Mastitis
Biology
medicine.disease_cause
Mice
03 medical and health sciences
Mammary Glands, Animal
0302 clinical medicine
Immune system
Immunity
Escherichia coli
medicine
Animals
Immunology and Allergy
IL-2 receptor
Escherichia coli Infections
Escherichia coli infection
Interleukin-17
T lymphocyte
Flow Cytometry
Immunohistochemistry
3. Good health
Mice, Inbred C57BL
Disease Models, Animal
CXCL2
030104 developmental biology
Cytokine
[SDV.MP]Life Sciences [q-bio]/Microbiology and Parasitology
Cytokines
Female
030215 immunology
Subjects
Details
- Language :
- English
- ISSN :
- 00221767 and 15506606
- Database :
- OpenAIRE
- Journal :
- Journal of Immunology, Journal of Immunology, Publisher : Baltimore : Williams & Wilkins, c1950-. Latest Publisher : Bethesda, MD : American Association of Immunologists, 2016, 196 (2), pp.803-812. ⟨10.4049/jimmunol.1500705⟩
- Accession number :
- edsair.doi.dedup.....85fb4cfc5b4560cf21142981e63b90a0