TNF and colitis: The neopterin, TNF-α, and interferon-γ levels of colitis group (group 2) were significantly higher than those of the group 1 (healthy control), group 3 (40 mg/kg: low dose strontium), group 4 (160 mg/kg: high dose strontium), and group 5 (prednisolone) (P < 0.05).