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Effect of Probiotics on Central Nervous System Functions in Animals and Humans: A Systematic Review
( Huiying Wang ),( In-seon Lee ),( Christoph Braun ),( Paul Enck ) 대한소화기기능성질환·운동학회(구 대한소화관운동학회) 2016 Journal of Neurogastroenterology and Motility (JNM Vol.22 No.4
To systematically review the effects of probiotics on central nervous system function in animals and humans, to summarize effective interventions (species of probiotic, dose, duration), and to analyze the possibility of translating preclinical studies. Literature searches were conducted in Pubmed, Medline, Embase, and the Cochrane Library. Only randomized controlled trials were included. In total, 38 studies were included: 25 in animals and 15 in humans (2 studies were conducted in both). Most studies used Bifidobacterium (eg, B. longum, B. breve , and B. infantis ) and Lactobacillus (eg, L. helveticus , and L. rhamnosus ), with doses between 10<sup>9</sup> and 10<sup>10</sup> colonyforming units for 2 weeks in animals and 4 weeks in humans. These probiotics showed efficacy in improving psychiatric disorderrelated behaviors including anxiety, depression, autism spectrum disorder (ASD), obsessive-compulsive disorder, and memory abilities, including spatial and non-spatial memory. Because many of the basic science studies showed some efficacy of probiotics on central nervous system function, this background may guide and promote further preclinical and clinical studies. Translating animal studies to human studies has obvious limitations but also suggests possibilities. Here, we provide several suggestions for the translation of animal studies. More experimental designs with both behavioral and neuroimaging measures in healthy volunteers and patients are needed in the future.