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Supplementation with Bifidobacterium longum Bar33 and Lactobacillus helveticus Bar13 mixture improves immunity in elderly humans (over 75 years) and aged mice

Finamore et al., Nutrition, doi:10.1016/j.nut.2019.02.005
Jul 2019  
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RCT 98 adults, showing that probiotics improved immune function including increased natural killer (NK) cell activity.
Graydon showed that a lower frequency of natural killer cells was associated with symptomatic COVID-19 infection.
The immune effects of probiotics are strain-specific.
Finamore et al., 31 Jul 2019, Double Blind Randomized Controlled Trial, placebo-controlled, Italy, peer-reviewed, 10 authors.
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Supplementation with Bifidobacterium longum Bar33 and Lactobacillus helveticus Bar13 mixture improves immunity in elderly humans (over 75 years) and aged mice
Ph.D Alberto Finamore, Ph.D Marianna Roselli, Lorenzomaria Donini, Dr. Elisa Brasili, Rita Rami, M.Sc. c Paola Carnevali, Lorenza Mistura, Alessandro Pinto, Annamaria Giusti, Ph.D Elena Mengheri
Nutrition, doi:10.1016/j.nut.2019.02.005
Aging induces several physiologic and immune changes. The usefulness of probiotics in ameliorating age-related disorders remains largely unexplored. The aim of this study was to evaluate the effectiveness of a Bifidobacterium longum Bar33 and Lactobacillus helveticus Bar13 mixture in improving the physiologic status and immunity of older adults (over 75 years). Furthermore, the possible role of such mixture in ameliorating gut immunity in aged mice was investigated. Methods: A randomized, double-blind, placebo-controlled trial was conducted with 98 adults (84.6 § 7.8 y), supplemented for 30 d with a biscuit containing a probiotic mixture of B. longum Bar33 and L. helveticus Bar13 (1:1), or no probiotics, as placebo. Blood was collected for analysis of biochemical parameters, lymphocyte subpopulations, natural killer activity, and cytokine release. Aged Balb/c mice received the same probiotic mixture or placebo daily for 28 d, then blood and intestinal lymphocyte subpopulations were analyzed. Results: The probiotic mixture ameliorated immune response in older adults by increasing naive, activated memory, regulatory T cells, B cells, and natural killer activity and decreasing memory T cells compared with placebo (P < 0.05). The biochemical parameters did not change after probiotic supplementation. In the gut of old mice, the two probiotics modulated cells crucial for gut immune homeostasis by increasing regulatory T (Treg and Tr1) and decreasing gd T cells compared with control mice (P < 0.05). In addition, B cells increased in the gut and blood of probiotic-treated mice. Conclusion: Results from the present study data indicated that B. longum Bar33 and L. helveticus Bar13 improve immune function at intestinal and peripheral sites in aging.
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