Anti-Inflammatory Agents, Non-Steroidal/antagonists & inhibitors; Anti-Ulcer Agents/therapeutic use; Escin/therapeutic use; Gastric Mucosa/drug effects; Indomethacin/antagonists & inhibitors; Protective Agents/therapeutic use; Stomach Ulcer/prevention & control; Animals; Anti-Inflammatory Agents, Non-Steroidal/administration & dosage; Anti-Inflammatory Agents, Non-Steroidal/adverse effects; Anti-Inflammatory Agents, Non-Steroidal/therapeutic use; Anti-Ulcer Agents/administration & dosage; Antioxidants/administration & dosage; Antioxidants/therapeutic use; Dose-Response Relationship, Drug; Escin/administration & dosage; Gastric Mucosa/immunology; Gastric Mucosa/metabolism; Gastric Mucosa/pathology; H(+)-K(+)-Exchanging ATPase/chemistry; H(+)-K(+)-Exchanging ATPase/metabolism; Indomethacin/adverse effects; Lipid Peroxidation/drug effects; Mice; Oxidoreductases/antagonists & inhibitors; Oxidoreductases/metabolism; P-Selectin/antagonists & inhibitors; P-Selectin/chemistry; P-Selectin/metabolism; Protective Agents/administration & dosage; Random Allocation; Severity of Illness Index; Stomach/drug effects; Stomach/immunology; Stomach/pathology; Stomach Ulcer/chemically induced; Stomach Ulcer/metabolism; Stomach Ulcer/pathology; Tumor Necrosis Factor-alpha/agonists; Tumor Necrosis Factor-alpha/antagonists & inhibitors; Tumor Necrosis Factor-alpha/metabolism; Vascular Cell Adhesion Molecule-1/chemistry; Vascular Cell Adhesion Molecule-1/metabolism