a Immunofluorescent staining of intestinal TJ proteins, including ZO-1, claudin-4, occludin, and claudin-2, in jejunum tissue (scale bar, 25 μm). b Immunoblot analysis of intestinal TJ proteins. c Plasma LPS levels (n = 5–6). d The hepatic expressions of gram-negative bacteria 16S rRNA (n = 7). e Fecal LPS contents (n = 7). f Immunofluorescent staining of TNF-α (green) and F4/80 (red) in the sections of jejunum tissue (scale bar, 25 μm). Data were expressed as mean ± SD. Labeled means without a common letter differ within the column (p < 0.05). CO corn oil, OFO oxidized fish oil, FO fish oil.