Abstract:
:The relationship between allergic airway inflammation and pneumococcal pneumonia is not well understood. We assessed susceptibility to experimental pneumococcal pneumonia in mice with and without allergic airway inflammation. Susceptibility to pneumococcal pneumonia was evaluated by challenging mice with a bioluminescent Streptococcus pneumoniae strain after sensitization with ovalbumin (OVA), with subsequent monitoring of pneumococcal infection using real-time photonic imaging. Of 46 OVA-sensitized mice challenged with pneumococci, 13 (28%) developed imaging findings consistent with pneumococcal pneumonia. In comparison, 28 (57%) of 49 non-sensitized control mice developed pneumococcal pneumonia (P = 0.005). While none of the control group developed meningitis (0%, none of 28), two mice in the OVA-sensitized group developed meningitis (15.4%, two of 13) (P = 0.09). The mean bacterial count in the lung was significantly lower in the OVA-sensitized than the non-sensitized group (8.26 +/- 0.69 versus 9.21 +/- 0.67 log(10) colony-forming units (CFU)/g, P = 0.002). There was a trend towards the mean bacterial count in the spleen being higher in the OVA-sensitized versus the non-sensitized group (8.14 +/- 0.89 versus 7.45 +/- 1.07 log(10) CFU/g, P = 0.071). A high level of interleukin (IL)-4 in lung homogenates was associated with risk of pneumococcal infection independent of sensitization with OVA (odds ratio: 49.7, 95% confidence interval 2.92-846.5, per increment of 1.0 pg/ml). In the murine model studied, acute allergic airway inflammation reduced susceptibility to pneumococcal pneumonia. IL-4 may increase the risk of pneumococcal pneumonia independently of allergic airway inflammation.
journal_name
Clin Exp Immunoljournal_title
Clinical and experimental immunologyauthors
Kang CI,Rouse MS,Patel R,Kita H,Juhn YJdoi
10.1111/j.1365-2249.2009.03925.xsubject
Has Abstractpub_date
2009-06-01 00:00:00pages
552-61issue
3eissn
0009-9104issn
1365-2249pii
CEI3925journal_volume
156pub_type
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