Protective effects of Moringa oleifera against acetic acid-induced colitis in rat: Inflammatory mediators’ inhibition and preservation the colon morphohistology

Moringa oleifera decoction is used in folk medicine to alleviate various gastrointestinal ailments and has been shown in several studies to exhibit diverse biological activities: antioxidant, anti-inflammatory, and myorelaxant on intestine strips. However, its protective effect on pro-inflammatory cytokines in colitis remains to be ascertained. We investigated Moringa oleifera leaf aqueous extract activities on a rat model of acetic acid-induced colitis. Thirty-six rats were divided in random into six groups, and received either distilled water (10 mL/kg), the aqueous leaf extract of Moringa oleifera (25, 50, and 100 mg/kg) or the reference drug Loperamide (5 mg/kg) for 20 days. Animal body weight and food intake were followed-up. Colitis was induced on day 15, and daily stool weight was followed up. Animals were sacrificed (day 21), serum concentrations of pro-inflammatory cytokines MPO, IL-6, and TNF-α were evaluated, and the colon and liver preserved for histological examinations. After one-week pre-treatment, a significant (P < 0.05) weight increase was observed. At day 20, the extract significantly (P < 0.01) prevented weight loss. Food intake decreased by 36.33% in the colitis control, and by 4.34% in the extract (100 mg/kg) treated animals (P < 0.01). Moringa oleifera (100 mg/kg, day 20) decreased stool weights to 4.75±0.3 g (P < 0.05). The extract decreased (P < 0.01) MPO level. At 100 mg/kg, it significantly (P < 0.05) reduced IL-6 –0.58 ± 0.14 against 0.85 ± 0.00 ng/L in the colitis control. At the same dose, TNF-α levels decreased to 417.96 ± 0.17 ng/L (P < 0.001). Moringa oleifera alleviated colitis symptoms by reducing stool emission, alleviating inflammation, and preserving colon and liver cytoarchitecture.