Cytokine–chemokine networks in experimental mycobacterial and schistosomal pulmonary granuloma formation

BC Chiu, CM Freeman, VR Stolberg… - American journal of …, 2003 - atsjournals.org
BC Chiu, CM Freeman, VR Stolberg, E Komuniecki, PM Lincoln, SL Kunkel, SW Chensue
American journal of respiratory cell and molecular biology, 2003atsjournals.org
Type-1 and type-2 lung granulomas, respectively, elicited by bead immobilized
Mycobacteria bovis and Schistosoma mansoni egg antigens (Ags) display different patterns
of chemokine expression. This study tested the hypothesis that chemokine expression
patterns were related to upstream cytokine signaling. Using quantitative transcript analysis,
we defined expression profiles for 16 chemokines and then examined the in vivo effects of
neutralizing antibodies against interferon-γ (IFN-γ), interleukin (IL)-4, IL-10, IL-12, and IL-13 …
Type-1 and type-2 lung granulomas, respectively, elicited by bead immobilized Mycobacteria bovis and Schistosoma mansoni egg antigens (Ags) display different patterns of chemokine expression. This study tested the hypothesis that chemokine expression patterns were related to upstream cytokine signaling. Using quantitative transcript analysis, we defined expression profiles for 16 chemokines and then examined the in vivo effects of neutralizing antibodies against interferon-γ (IFN-γ), interleukin (IL)-4, IL-10, IL-12, and IL-13. Transcripts for CXCL2, -5, -9, -10, and -11 and the CCL chemokine, CCL3, and lymphotactin (XCL1), were largely enhanced by Th1-related cytokines, IFN-γ or IL-12. Transcripts for CCL11, CCL22, CCL17, and CCL1 were enhanced largely by Th2-related cytokines, IL-4, IL-10, or IL-13. Transcripts for CCL4, CCL2, CCL8, CCL7, and CCL12 were potentially induced by either Th1- or Th2-related cytokines, although some of these showed biased expression. IFN-γ and IL-4 enhanced the greatest complement of transcripts, and their neutralization had the greatest anti-inflammatory effect on type-1 and type-2 granulomas, respectively. Th1/Th2 cross-regulation was evident because endogenous Th2 cytokines inhibited type-1, whereas Th1 cytokines inhibited type-2 biased chemokines. These findings reveal a complex cytokine–chemokine regulatory network that dictates profiles of local chemokine expression during T cell–mediated granuloma formation.
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