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Journal Article
Research Support, Non-U.S. Gov't
Endogenous interleukin-10 suppresses allergen-induced airway inflammation and nonspecific airway responsiveness.
Clinical and Experimental Allergy 2000 June
BACKGROUND: The airway inflammation observed in asthma is orchestrated by activated Th-2 lymphocytes relevant for the induction of altered airway responsiveness. An increasing body of evidence is accumulating that not only the pro-inflammatory cytokines interleukin (IL)-4 and IL-5 but also the immunomodulating cytokines IL-12 and possibly IL-10 are crucial for regulating the allergic airway inflammation.
OBJECTIVE: Since IL-10 is capable of downregulating a broad spectrum of pro-inflammatory cytokines, we wanted to address the role of endogenously produced IL-10 in vivo in allergic asthma.
METHODS: Knockout (IL-10(-/-)) mice (C57BL/6-IL10tm1Cgn) and wild-type (WT) counterparts were immunized (day 0) and exposed (day 14-21) to ovalbumin (OVA). Airway inflammation and reactivity (AR), serum allergen-specific IgE responses and cytokine profiles in the bronchoalveolar lavage fluid (BALF) were studied.
RESULTS: The IL-10(-/-) mice had more eosinophilic airway inflammation but comparable levels of allergen-specific serum IgE compared to the WT mice after allergen challenge. The AR was comparably increased in the OVA challenged WT and IL-10(-/-) mice vs sham-exposed WT, but not vs sham-exposed IL-10(-/-)mice since these showed a higher baseline AR. IFN gamma, IL-4 and IL-13 were comparable and IL-5 was even lower in the BALF of the in IL-10(-/-) mice compared to the similarly exposed WT mice.
CONCLUSION: These results indicate that IL-10 plays an important and possibly direct role in the control of airway inflammation and responsiveness in an in vivo mouse model of allergy.
OBJECTIVE: Since IL-10 is capable of downregulating a broad spectrum of pro-inflammatory cytokines, we wanted to address the role of endogenously produced IL-10 in vivo in allergic asthma.
METHODS: Knockout (IL-10(-/-)) mice (C57BL/6-IL10tm1Cgn) and wild-type (WT) counterparts were immunized (day 0) and exposed (day 14-21) to ovalbumin (OVA). Airway inflammation and reactivity (AR), serum allergen-specific IgE responses and cytokine profiles in the bronchoalveolar lavage fluid (BALF) were studied.
RESULTS: The IL-10(-/-) mice had more eosinophilic airway inflammation but comparable levels of allergen-specific serum IgE compared to the WT mice after allergen challenge. The AR was comparably increased in the OVA challenged WT and IL-10(-/-) mice vs sham-exposed WT, but not vs sham-exposed IL-10(-/-)mice since these showed a higher baseline AR. IFN gamma, IL-4 and IL-13 were comparable and IL-5 was even lower in the BALF of the in IL-10(-/-) mice compared to the similarly exposed WT mice.
CONCLUSION: These results indicate that IL-10 plays an important and possibly direct role in the control of airway inflammation and responsiveness in an in vivo mouse model of allergy.
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