Published ahead of print on December 30, 2004, doi:10.1165/rcmb.2004-0197OC
Am. J. Respir. Cell Mol. Biol., Volume 32, Number 3, March 2005, 201-210
A more recent version of this article appeared on March 1, 2005
Submitted on June 21, 2004
Revised on December 30, 2004
Mycoplasma pneumoniae Induces Host-Dependent Pulmonary Inflammation and Airway Obstruction in Mice
Monica Fonseca-Aten1*, Ana M Rios1, Asuncion Mejias1, Susana Chavez-Bueno1, Kathy Katz1, Ana M Gomez2, George H McCracken1, and R. Doug Hardy3
1 Department of Pediatrics, University of Texas Southwestern Medical Center, Dallas, Texas, USA,
2 Department of Pathology, University of Texas Southwestern Medical Center, Dallas, Texas, USA,
3 Department of Pediatrics, University of Texas Southwestern Medical Center, Dallas, Texas, USA; Department of Internal Medicine, University of Texas Southwestern Medical Center, Dallas, Texas, USA
* To whom correspondence should be addressed. E-mail: monica.fonseca-aten{at}utsouthwestern.edu.
Respiratory tract infections result in wheezing in a subset of patients. Mycoplasma pneumoniae is a common etiologic agent of acute respiratory infection in children and adults that has been associated with wheezing in 20% to 40% of individuals. The current study was undertaken to elucidate the host dependent pulmonary and immunologic response to M. pneumoniae respiratory infection by studying mice with different immunogenetic backgrounds (BALB/c mice versus C57BL/6 mice). After M. pneumoniae infection, only BALB/c mice developed significant airway obstruction (AO) compared with controls. M. pneumoniae infected-BALB/c mice manifested significantly elevated airway hyperresponsiveness (AHR) compared with C57BL/6 mice four and seven days post inoculation as well as BALB/c control mice. Compared with C57BL/6 mice, BALB/c mice developed worse pulmonary inflammation including greater peribronchial infiltrates. Infected BALB/c mice had significantly higher concentrations of tumor necrosis factor- , interferon- , interleukin (IL)-1 , IL-6, IL-12, KC, and macrophage inflammatory protein 1 in the bronchoalveolar lavage fluid compared with infected C57BL/6 mice. No differences in IL-2, IL-4, IL-5, IL-10, and granulocyte/ macrophage colony-stimulating factor concentrations were found. The mice in this study exhibited host-dependent infection-related AO and AHR associated with chemokine and T-helper type (Th)1 pulmonary host response and not Th2 response after M. pneumoniae infection.
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