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   <subfield code="a">Pichia pastoris X-33 has probiotic properties with remarkable antibacterial activity against Salmonella Typhimurium</subfield>
   <subfield code="h">[Elektronische Daten]</subfield>
   <subfield code="c">[Rodrigo França, Fabricio Conceição, Marcelo Mendonça, Louise Haubert, Gabriela Sabadin, Patrícia de Oliveira, Marta Amaral, Wladimir Silva, Ângela Moreira]</subfield>
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   <subfield code="a">Probiotics are live microorganisms which are beneficial for the host when ingested at high enough concentrations. The methylotrophic yeast Pichia pastoris is widely used as heterologous protein production platform. However, its use as probiotic is poorly studied. The objective of this study was to evaluate some probiotic properties of the P. pastoris strain X-33 wild type. The resistance to in vitro and in vivo gastrointestinal conditions, stability in feed, safety, and antibacterial activity against Salmonella Typhimurium were evaluated. The yeast remained viable and persisted at appropriate concentration in the diet for at least 2months, survived the stresses of the gastrointestinal tract in vitro and in vivo, caused no behavioral changes or lesions when administered to mice, inhibited the growth of S. Typhimurium in culture media, and reduced adhesion of the bacteria to the intestinal cells HCT-116. In the challenge experiment with a LD50 of virulent S. Typhimurium strain, mice supplemented with the yeast had a higher survival rate (50% when administered by gavage and 80% via the diet, compared with 20 and 50%, respectively, in the control group). In addition, the S. Typhimurium concentration in the intestine of the surviving mice was lower; the score of intestinal lesions, lower; and the pathogen, not detected in the liver, spleen, and feces when compared to the control group (p&lt;0.05). It was concluded that the yeast Pichia pastoris X-33 has probiotic properties with remarkable antibacterial activity against S. Typhimurium.</subfield>
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