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Background  Cysteamine was coated to cover its odor and maintain the stability. However, coated cysteamine (CC) has not been clearly evaluated for its effects on the gastrointestinal mucosa status. We hypothesize that the appropriate CC supplementation in diet impacts the stomach and intestinal mucosa variously through regulating the morphology, apoptosis, and oxidative stress status in model of pigs.    Results  The results showed that villus height increased ( P  < 0.05), and crypt depth decreased ( P  < 0.05) in the ileum when pigs were fed the diet with low cysteamine (LCS) compared with the control diet. The ileal lesion score in the LCS group was significantly ( P  < 0.01) lower than that in the control group, while the gastric lesion score in the CC group was significantly ( P  < 0.01) higher compared with that of the control group. It also showed that the activities of total superoxide dismutase (T-SOD) and diamine oxidase (DAO) were upregulated ( P  < 0.05) in the LCS group. In addition, Bax and caspase 3 immunore-activity increased ( P  < 0.01), and Bcl-2 immunoreactivity decreased ( P  < 0.01) in the gastric mucosa of pigs fed the diet with high cysteamine (HCS). The Bax and caspase 3 immunoreactivity decreased ( P  < 0.01), and Bcl-2 immunoreactivity increased ( P  < 0.01) in ileum mucosa of pigs fed the HCS diet.    Conclusions  Although moderate dietary coated cysteamine showed positive effects on GI mucosal morphology, apoptosis, and oxidative stress status, the excess coated cysteamine may cause apoptosis leading to GI damage in pigs.

Influence of supplemented coated-cysteamine on morphology, apoptosis and oxidative stress status of gastrointestinal tract