Aloe vera attenuated gastric injury on indomethacin-induced gastropathy in rats

AIM: To evaluate the protective effects of Aloe vera on gastric injury in rats with indomethacin (IMN)-induced gastropathy. METHODS: Male Sprague-Dawley rats were randomly divided into three groups. Group 1 (control, n = 6) was given distilled water (DW) orally. Group 2 (IMN, n = 6) was given oral IMN (150 mg/kg) dissolved in 5% sodium bicarbonate (NaHCO3-) at time 0 and 4 h. Group 3 (Aloe vera-treated, n = 6) was given oral Aloe vera (150 mg/kg) dissolved in DW and IMN at time 0 and 4 h. Eight hours later, the stomach was removed to determine gastric malondialdehyde (MDA), the number of interleukin (IL)-18 positive stained cells (%) by immunohistochemistry, and for histopathological examination. Then, the serum was collected to determine tumor necrosis factor (TNF)-a and cytokineinduced neutrophil chemoattractant (CINC)-1 by sandwich enzyme linked immunosorbent assay method. RESULTS: In the IMN group, serum TNF-a, CINC-1 and gastric MDA were significantly increased when compared to the control group (27.78 1.52 pg/mL vs 85.07 49.11 pg/mL, P = 0.009; 104.55 45.80 pg/mL vs 1054.70 20.38 pg/mL, and 1.74 0.21 nmol/mg vs 9.36 1.07 nmol/mg protein, P = 0.000, respectively). The mean level of TNF-a, CINC-1 and gastric MDA in the Aloe vera-treated group were improved as compared with the IMN group (85.07 49.11 pg/mL vs 35.19 1.61 pg/mL, P = 0.021; 1054.70 20.38 pg/mL vs 813.56 239.04 pg/mL, P = 0.025; and 9.36 1.07 nmol/mg vs 2.67 0.64 nmol/mg protein, P = 0.000, respectively). The number of IL-18 positive stained cells (%) in the gastric epithelial cells of the IMN group was significantly higher than the control group (5.01% 3.73% vs 30.67% 2.03%, P = 0.000, respectively). In contrast, Aloe vera treatment decreased the number of IL-18 positive stained cells (%) significantly when compared with the IMN group (30.67% 2.03% vs 13.21% 1.10%, P = 0.000, respectively). Most rats in the IMN group developed moderate to severe gastric inflammation and erosions. The gastric erosions and neutrophil infiltration scores were significantly reduced in the Aloe veratreated group. CONCLUSION: Aloe vera attenuated IMN-induced gastropathy in rats by the reduction of oxidative stress, inflammation, and improvement of gastric