Lung tissues resected during surgery for SP were fixed in 10% buffered formalin and embedded in paraffin. After deparaffination of lung tissue specimens, antigen retrieval was sequentially conducted by autoclave in 10 mM Citrate buffer (pH 6.0) for 15 min at 105 ℃. Samples were incubated with anti-rabbit cleaved caspase-3 antibody (dilution 1:200; #9664, Cell Signaling Technology, Danvers, Massachusetts, USA) for 1 h at room temperature following incubation with Histofine Simple Stain MAX-PO (MULTI) (#424152; Nichirei, Tokyo, Japan) for 30 min at room temperature. Peroxidase staining was visualized with 3,3-diaminobenzidine and hematoxylin was used for counter staining. At least 300 PMCs were counted in each sample and the percentage of PMCs stained with anti-cleaved caspase-3 antibody was calculated in 3 unrelated samples per group.
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