In situ immunohistochemical analysis of colonic paraffin sections was performed as described previously [13 (link), 17 (link), 18 (link), 23 (link), 24 (link)]. In brief, primary antibodies against cleaved caspase-3 (Asp175, Cell Signaling, USA, 1:200), CD3 (#N1580, Dako, Denmark, dilution 1:10), FOXP3 (FJK-16s, eBioscience, 1:100), B220 (eBioscience, 1:200), and F4/80 (# 14–4801, clone BM8, eBioscience, San Diego, CA, USA, 1:50) were used [13 (link)]. For each animal, the average number of positively stained cells within at least six high power fields (HPF, 400 x magnification) were determined microscopically by a double-blinded investigator [13 (link)].
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