CXCR3 and Its Ligands Participate in the Host Response to Bordetella bronchiseptica Infection of the Mouse Respiratory Tract but Are Not Required for Clearance of Bacteria from the Lung

Infection and Immunity(2005)

Cited 5|Views0
No score
Abstract
Intranasal inoculation of mice with Bordetella bronchiseptica produces a transient pneumonia that is cleared over several weeks in a process known to require both neutrophils and lymphocytes. In this study, we evaluated the roles of the chemokines MIG (CXCL9), IP-10 (CXCL10), and I-TAC (CXCL11) and their common receptor, CXCR3. Following bacterial inoculation, message expression of interleukin-1 (IL-1), IL-6, and the neutrophil-attracting chemokines KC, LIX, and MIP-2 was rapidly induced, with maximal expression found at 6 h. In contrast, message expression of gamma interferon, MIG, IP-10, and I-TAC peaked at 2 days. Expression of all of these chemokines and cytokines returned to near baseline by 5 days, despite the persistence of high levels of live bacteria at this time. Induced MIG, IP-10, and I-TAC protein expression was localized in areas of inflammation at 2 to 3 days and was temporally associated with increased levels of CXCR3 + lymphocytes in bronchoalveolar lavage fluid. There was no increase in mortality in mice lacking CXCR3. However, the clearance of bacteria from the lung and trachea was delayed, and the recruitment of lymphocytes and NK cells was slightly decreased, for CXCR3 −/− mice relative to CXCR3 +/+ mice. We conclude that the CXCR3 receptor-ligand system contributes to pulmonary host defense in B. bronchiseptica infection by recruiting lymphocytes and NK cells into the lung.
More
Translated text
Key words
mouse respiratory tract,bacteria,ligands participate,bronchiseptica</i>infection,lung
AI Read Science
Must-Reading Tree
Example
Generate MRT to find the research sequence of this paper
Chat Paper
Summary is being generated by the instructions you defined