Abstract:
:We have characterized leukocyte migration to the pleural cavity in a methylated-BSA (mBSA)-induced model of murine delayed-type hypersensitivity and evaluated the ability of IL-4 and IL-10 to modulate this response. Neutrophils, macrophages, T cells, and dendritic cells migrated to the pleural cavity in a time-dependent fashion following direct intrapleural antigen challenge, with neutrophils comprising the majority of exudate leukocytes in the cavity within the first 24 h and the number of mononuclear cells increasing at later times. Real-time quantitative PCR analysis of infiltrating leukocytes revealed a marked elevation of steady-state mRNA levels of IL-1beta and TNFalpha and the chemokines KC, MIP-2, CXCL9, CXCL10, CXCL11, CCL2, CCL3, and CCL4 at 6 h postchallenge, which diminished over time. In contrast, gammaIFN mRNA levels were maximal at 24 h and CCL5 expression was sustained throughout 72 h. ELISA analysis of pleural exudate fluid revealed significant elevations of KC and CCL2 protein levels at 6 h postantigen challenge and a peak increase in gammaIFN protein at 24 h, confirming our mRNA observations. Administration of recombinant murine IL-4 or IL-10 prior to challenge significantly blocked cell trafficking to the pleural cavity as well as peak levels of exudate gammaIFN, with IL-4 being more potent in impairing these responses. IL-4 administration also increased the proportion of naive T cells in the pleural cavity, as judged by CD62L and CD45RB expression. These results indicate that this in vivo model demonstrates a pattern of events associated with Th1-mediated leukocyte trafficking and underscore the potential utility of this in vivo model for evaluating therapeutic inhibitors of leukocyte trafficking.
journal_name
Inflammationjournal_title
Inflammationauthors
Fine JS,Rojas-Triana A,Jackson JV,Engstrom LW,Deno GS,Lundell DJ,Bober LAdoi
10.1023/a:1025076111950keywords:
subject
Has Abstractpub_date
2003-08-01 00:00:00pages
161-74issue
4eissn
0360-3997issn
1573-2576journal_volume
27pub_type
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