Published ahead of print on September 4, 2003, doi:10.1165/rcmb.2003-0246OC
Am. J. Respir. Cell Mol. Biol., Volume 30, Number 3, March 2004, 319-325
A more recent version of this article appeared on March 1, 2004
Submitted on June 27, 2003
Revised on September 2, 2003
ROLE OF SP-A IN NO PRODUCTION AND MYCOPLASMA KILLING IN CONGENIC C57BL/6 MICE
Judy M Hickman-Davis1, Julie Gibbs-Erwin1, J. Russell Lindsey2, and Sadis Matalon3*
1 Anesthesiology, University of Alabama, Birmingham, AL, USA,
2 Genomics and Pathobiology, University of Alabama, Birmingham, AL, USA,
3 Anesthesiology, University of Alabama, Birmingham, AL, USA; Genomics and Pathobiology, University of Alabama, Birmingham, AL, USA; Physiology and Biophysics, University of Alabama, Birmingham, AL, USA
* To whom correspondence should be addressed. E-mail: sadis{at}uab.edu.
We generated congenic surfactant protein A (SP-A)-deficient [SP-A(-/-)] mice on the mycoplasma resistant C57BL/6 background [B6.SP-A(-/-)] and characterized their response to mycoplasma infection in comparison to C57BL/6 (B6) mice. B6.SP-A(-/-) mice infected with 106 colony forming units (CFU) of Mycoplasma pulmonis had significantly higher bacterial lung loads than B6 mice at 72 hours postinfection (p.i.). At the higher infection dose of 107, B6.SP-A(-/-) mice had significantly higher lung CFU at 24 hours, however, no difference in mycoplasma CFU was observed between B6 and B6.SP-A(-/-) mice at 48 and 72 hours p.i. We found that uninfected B6 mice had lower BAL nitrite (NO2-) and nitrate (NO3-) levels as compared to B6.SP-A(-/-) mice. On the other hand, infection of B6 mice with mycoplasmas resulted in significantly higher BAL NO2- and NO3- as compared to B6.SP-A(-/-) mice. These data indicate that SP-A may help regulate NO production in response to a specific stimulus, i.e., suppression of NO in the absence of bacteria and increased NO in the presence of bacteria. These data indicate that the contribution of SP-A to mycoplasma killing may be limited to lower doses of pathogens.
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