Avaliação da Resposta Inflamatória na Infecção por Brachyspira hyodysenteriae em Leitões Tratados com Nutracêutico

Abstract

The aim of this study was to elucidate mechanisms involved in the protective and therapeutic action conferred by nutraceuticals based on insoluble fibers on the gastrointestinal tract of pigs experimentally inoculated with B. hyodysenteriae. The samples were tested by qPCR, bacterial isolation and histopathology, in addition were performed to mensured antioxidant enzymes concentration recovered from intestinal mucosa scraping and FITC Dextran serum recovery, administered orally to the animals. Forty 21-day-old piglets were randomized and separated into four groups: negative control, not inoculated with B. hyodysenteriae and not supplemented with nutraceutical additive (CN) (n = 10); group supplemented with nutraceuticals 7 days before inoculation with B. hyodysenteriae (NAI) (n = 10); group supplemented with nutraceutical after inoculation with B. hyodysenteriae (NPI) (n = 10); and positive control, inoculated with B. hyodysenteriae and not supplemented with nutraceutical (CP) (n = 10). Fourteen days after arrival the animals were inoculated with B. hyodysenteriae during three consecutive days and the negative inoculated group received sterile BHI broth (CN). After 14 days post inoculation, all animals were euthanized and necropsied. The results related to clinical signs, fecal shedding of B. hyodysenteriae, gross lesions, microscopic lesions and intestinal permeability suggested that the use of insoluble fiber nutraceuticals in the feed of pigs experimentally inoculated by B. hyodysenteriae was not decisive in the prevention or treatment of DS, did not contributed to the maintenance of intestinal integrity nor to the reduction of elimination of the agent. The results regarding the concentrations of antioxidant enzymes Glutathione-S-transferase and Superoxido dismutase were higher in the CP and CN groups, suggesting that the nutraceutical did not provide additional protection against oxidative stress during DS. However, the concentrations of tissue proteins and lipoperoxidation were reduced in nutraceutical groups, indicating the positive effect on the oxidative stress during the onset of DS.