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In this study, we investigated serum interleukin-1 beta (IL-1β) and tumor necrosis factor alpha (TNF-α) after ingestion of aflatoxin B1 (AFB1) in rats. We also studied the effects of nitric oxide (NO) on the stomach after consumption of AFB1. Therefore, we hypothesized that a standard anti-inflammatory agent-melatonin (MEL), and the flavonoid-rich fractions from Chromolaena odorata (FRFC) could counteract the deleterious effects of IL-1β, TNF-α, and NO after consumption of AFB1. Thirty-five Wistar rats (211.86 ± 27.23 g) were randomly selected into 5 groups, with 7 rats in each group. Group A (control); all rats in groups B, C, D, and E received 2.5 mg/kg AFB1 each orally on day 5, whereas those of groups C, D, and E received oral administration of 10 mg/kg MEL, 50 mg/kg FRFC 1 , and 100 mg/kg FRFC 2 , respectively, for 7 days. All of them were killed on the 8th day, 24 h after last treatment. Serum samples were analyzed for IL-1β and TNF-α, whereas stomach tissue was evaluated for NO level. Significant ( P  &lt; 0.5) increase in serum IL-1β and TNF-α in rats given AFB1 only was recorded when compared with those in the control group. Conversely, we observed significant reduction in serum IL-1β and TNF-α in all the groups that received MEL, FRFC 1 , and FRFC 2 after pretreatment with AFB1 when compared with those that were given AFB1 only. In addition, there was a significant increase in NO in rats given AFB1 only when compared with control, whereas reduction in NO was significant in the groups C, D, and E that were given MEL, FRFC 1 , and FRFC 2 , respectively, when compared with AFB1 group. MEL and FRFC may be responsible for the prevention of increased gastric mucosal NO and inflammatory effects of proinflammatory cytokines induced by AFB1.

journal of interferon and cytokine research

Effects of Melatonin and Flavonoid-Rich Fractions of<i>Chromolaena odorata</i>on the Alteration of Proinflammatory Cytokines and Nitric Oxide Induced by Aflatoxin B1 in the Gastric Mucosa of Wistar Rats

Effects of Melatonin and Flavonoid-Rich Fractions ofChromolaena odorataon the Alteration of Proinflammatory Cytokines and Nitric Oxide Induced by Aflatoxin B1 in the Gastric Mucosa of Wistar Rats