Mononuclear Phagocyte-derived Interleukin-10 Suppresses the Innate Pulmonary Granuloma Cytokine Response in Aged Mice

Overview

Journal Am J Pathol

Publisher Elsevier

Specialty Pathology

Date 2007 Jul 17

PMID 17631521

Citations 13

Authors

Bo-Chin Chiu

Valerie R Stolberg

Christine M Freeman

Stephen W Chensue

Affiliations

Soon will be listed here.

Abstract

Granulomas are sequestration responses observed in a wide variety of clinical conditions, including mycobacterial infection. We previously reported impaired adaptive, Th1 cell-mediated pulmonary granuloma formation in response to bead-immobilized Mycobacterium bovis-purified protein derivative in aged mice. To reveal determinants of age-related immune deficits, the present study examined the effect of aging on early innate stage pulmonary granuloma formation. Aged mice formed more neutrophil-rich innate granulomas with augmented CXCL2 expression followed by a pattern of rapid decay of tumor necrosis factor-alpha, interleukin (IL)-6, CCL3, and CXCL2. This was associated with enhanced IL-10 expression. Blockade of IL-10 signaling with anti-IL-10 receptor antibody reversed the age-related decay. Intracellular flow cytometric analysis revealed that CD11b(+)Gr-1(+/-) mononuclear phagocytes were the primary leukocyte sources of IL-10 in lungs, and their numbers were increased in aged mice. When exposed to purified protein derivative in vitro, young and old CD11b(+)Gr-1(+/-) mononuclear phagocytes from blood or lung had comparable IL-10 expression, suggesting in vivo signals in the aged environment enhanced the number of IL-10-producing cells in the aged lung. Our findings reveal a novel mechanism of age-associated IL-10 mediated pulmonary immune suppression with the potential to alter downstream adaptive immunity.

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