Protective effect of CSN1S2 protein of goat milk on ileum microstructure and inflammation in rat-CFA-induced rheumatoid arthritis

ObjectiveTo observe the protective effect of goat milk alpha (S2)-casein (CSN1S2) protein on ileum microstructure and inflammation in rat-complete Freund's adjuvant-induced rheumatoid arthritis model.MethodsTwenty four male Wistar rats were divided into six groups of two models. The body weight, food intake and albumin level of all subjects were calculated. The ileum microstructures were analyzed by scanning electron microscopy. Histopathological analysis was observed by hematoxylin-eosin staining and the level expressions of immunoglobulin E, secretory immunoglobulin A, interleukin-17, interleukin-10, Ki-67 and caspase-9 were measured by using western blotting.ResultsCSN1S2 protein of milk or yogurt could repair the ileum villi of rat arthritis group similar to the normal. The level expressions showed the immunoglobulin E, secretory immunoglobulin A, interleukin-17 and caspase-9 decreased in milk CSN1S2 protein and yogurt CSN1S2 protein rat groups. The level expression of interleukin-10 was increased, and also Ki-67 was significantly increased in milk CSN1S2 protein and yogurt CSN1S2 protein rat groups. CSN1S2 protein of milk and yogurt could increase the body weight and albumin significantly, meanwhile food intake increased but not significantly.ConclusionsCSN1S2 protein of goat milk and yogurt could repair the ileum microstructure, suppress inflammatory process and also increase the body weight, food intake and albumin level. This result indicates that goat CSN1S2 protein may protect the ileum disorder in rheumatoid arthritis disease.