Epithelial Cells/enzymology; I-kappa B Proteins; Intestinal Mucosa/enzymology; Isoenzymes/metabolism; Nitric Oxide Synthase/metabolism; Prostaglandin-Endoperoxide Synthases/metabolism; Animals; Arachidonic Acid/pharmacology; Benzenesulfonates/pharmacology; Blotting, Western; Cells, Cultured; Cyclooxygenase 2; Cyclooxygenase 2 Inhibitors; Cyclooxygenase Inhibitors/pharmacology; DNA-Binding Proteins/biosynthesis; Dinoprostone/analysis; Dinoprostone/metabolism; Down-Regulation/drug effects; Down-Regulation/physiology; Enzyme Induction/drug effects; Epithelial Cells/cytology; Epithelial Cells/drug effects; Interferon Regulatory Factor-1; Interferon-gamma/pharmacology; Intestinal Mucosa/cytology; Intestinal Mucosa/drug effects; Isoenzymes/antagonists & inhibitors; Isoenzymes/genetics; Lipopolysaccharides/pharmacology; Mitogen-Activated Protein Kinase 1/biosynthesis; Mitogen-Activated Protein Kinase 3; Mitogen-Activated Protein Kinases/biosynthesis; NF-KappaB Inhibitor alpha; NF-kappa B/metabolism; Nitric Oxide Synthase/genetics; Nitric Oxide Synthase Type II; Oxazoles/pharmacology; Phosphoproteins/biosynthesis; Prostaglandin-Endoperoxide Synthases/genetics; RNA, Messenger/analysis; RNA, Messenger/biosynthesis; Rats; Transcription Factor AP-1/metabolism; Transfection