Browsing by Subject "immune defence"

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  • EFSA Panel Dietetic Products Nutri; Heinonen, Marina (2017)
    Following an application from H.J. Heinz Supply Chain Europe B.V., submitted for authorisation of a health claim pursuant to Article 14 of Regulation (EC) No 1924/2006 via the Competent Authority of the Netherlands, the EFSA Panel on Dietetic Products, Nutrition and Allergies (NDA) was asked to deliver an opinion on the scientific substantiation of a health claim related to 'Nutrimune (R)' and immune defence against pathogens in the gastrointestinal (GI) tract and upper respiratory tract (URT). The food 'Nutrimune (R)' (a pasteurised cow's skim milk fermented with Lactobacillus paracasei CBA L74) which is the subject of the health claim is sufficiently characterised. The Panel considers that immune defence against pathogens in GI tract and URT is a beneficial physiological effect. One human intervention study from which conclusions can be drawn showed an effect of 'Nutrimune (R)' on immune defence against pathogens in the GI tract and the URT, and the results from one animal study could support an effect of 'Nutrimune (R)' on defence against pathogens in the GI tract. However, there were inconsistencies in the reporting of the process and criteria used for the diagnosis of URTI in the human intervention study, the results of this study have not been replicated, and no evidence was provided for a plausible mechanism by which 'Nutrimune (R)' could exert the claimed effect in vivo in humans. The Panel concludes that the evidence provided is insufficient to establish a cause and effect relationship between the consumption of 'Nutrimune (R)' and immune defence against pathogens in the gastrointestinal and upper respiratory tracts. (C) 2017 European Food Safety Authority. EFSA Journal published by John Wiley and Sons Ltd on behalf of European Food Safety Authority.
  • Peuss, Robert; Wensing, Kristina U.; Woestmann, Luisa; Eggert, Hendrik; Milutinovic, Barbara; Sroka, Marlene G. U.; Scharsack, Jörn P.; Kurtz, Joachim; Armitage, Sophie A. O. (2016)
    Down syndrome cell adhesion molecule 1 (Dscam1) has wide-reaching and vital neuronal functions although the role it plays in insect and crustacean immunity is less well understood. In this study, we combine different approaches to understand the roles that Dscam1 plays in fitness-related contexts in two model insect species. Contrary to our expectations, we found no short-term modulation of Dscam1 gene expression after haemocoelic or oral bacterial exposure in Tribolium castaneum, or after haemocoelic bacterial exposure in Drosophila melanogaster. Furthermore, RNAi-mediated Dscam1 knockdown and subsequent bacterial exposure did not reduce T. castaneum survival. However, Dscam1 knockdown in larvae resulted in adult locomotion defects, as well as dramatically reduced fecundity in males and females. We suggest that Dscam1 does not always play a straightforward role in immunity, but strongly influences behaviour and fecundity. This study takes a step towards understanding more about the role of this intriguing gene from different phenotypic perspectives.