It is hypothesized that infection with P. carinii renders the alveolar epithelium more susceptible to secondary insults, particularly hyperoxia, leading to respiratory failure in patients with PCP. To evaluate this hypothesis, the investigators will utilize a well-established CD4 depleted mouse model of P. carinii pneumonia, which is subsequently exposed to hyperoxia as a prototypical stress for alveolar wall injury. They propose that P. carinii infected mice will develop more severe lung injury following exposure to hyperoxia. They also postulate that GM-CSF, a potent cytokine generated by alveolar epithelial cells and macrophages, is critical in ameliorating this response. GM-CSF expression induced in response to P. carinii infection exerts a protective effect to limit lung injury. They postulate that inhibition of lung GM-CSF expression as a result of hyperoxia is a critical event promoting lung injury and respiratory failure.
Four specific aims will be undertaken. Initially they will characterize the response of P. carinii infected mice to hyperoxia. Next, they will determine the expression of GM-CSF in this animal infection model and in mice that genetically lack GM-CSF following exposure to PCP and hyperoxic conditions. They will further determine whether direct interaction of P. carinii and alveolar epithelial cells through integrins induces GM-CSF expression. Finally, they will evaluate the protective effect of GM-CSF in P. carinii pneumonia and in subsequent progression of lung injury following hyperoxia.

Agency
National Institute of Health (NIH)
Institute
National Heart, Lung, and Blood Institute (NHLBI)
Type
Research Project (R01)
Project #
1R01HL064558-01A1
Application #
6214018
Study Section
Special Emphasis Panel (ZRG1-AARR-1 (04))
Project Start
2000-07-01
Project End
2005-06-30
Budget Start
2000-07-01
Budget End
2001-06-30
Support Year
1
Fiscal Year
2000
Total Cost
$283,500
Indirect Cost
Name
University of Michigan Ann Arbor
Department
Internal Medicine/Medicine
Type
Schools of Medicine
DUNS #
791277940
City
Ann Arbor
State
MI
Country
United States
Zip Code
48109
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