Unstained lung sections were examined for expression of iNOS
by staining with antibody against iNOS. The bottom panel of Fig. 7
shows the immunohistochemistry of iNOS expression patterns.
Control mice showed no expression of iNOS. In contrast, OVAsensitized
and challenged mice showed a significantly high expression
of iNOS in bronchial epithelia and inflammatory cells such
as macrophages and eosinophils [19]. POX nanoparticles showed
minimal or no reduction of iNOS-stained cells. However, HPOX
nanoparticles significantly inhibited the iNOS expression.