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BACKGROUND & AIMImmunosenescence can increase morbi-mortality. Lactic acid producing bacteria may improve immunity and reduce morbidity and mortality in the elderly. We aimed to investigate the effects of a mixture of two new probiotic strains of Lactobacillus plantarum--CECT 7315 and 7316--on systemic immunity in elderly.METHODS50 institutionalized elderly subjects were randomized, in a double-blind fashion, to receive for 12 weeks 1) 5·10(8) cfu/day of L. plantarum CECT7315/7316 ("low probiotic dose") (n = 13), 2) 5·10(9) cfu/day of the probiotic mixture ("high probiotic dose") (n = 19), or 3) placebo (n = 15). Leukocyte subpopulations, and cytokine levels (IL-1 , IL-10, TGF-β1) were measured in venous blood at baseline, end of treatment (week 12), and end of follow-up (week 24). Infection and survival rates were recorded.RESULTSAfter treatment, high probiotic dose resulted in significant increases in the percentages of activated potentially T-suppressor (CD8+CD25+) and NK (CD56+ CD16+) cells, while low probiotic dose increased activated T-helper lymphocytes (CD4+CD25+), B lymphocytes (CD19+), and antigen presenting cells (HLA-DR+). Also, plasma TGF-β1 concentration significantly decreased after treatment with both probiotic doses. Most of these changes remained 12 weeks after probiotic discontinuation. Incidence of infections during treatment showed a significant trend to be lower in the high probiotic dose group. In addition, there was a significant trend for mortality to be greater in the placebo group vs. both probiotic groups.CONCLUSIONSDepending on the dose, L. plantarum CECT7315/7316 have different immune-enhancing effects in elderly subjects. These effects might result in a better clinical outcome.

nutricion hospitalaria

UNA MEZCLA DE LACTOBACILLUS PLANTARUM CECT 7315 Y CECT 7316 MEJORA LA INMUNIDAD SISTÉMICA EN ANCIANOS. UN ENSAYO ALEATORIO PILOTO, DE DOSIS-RESPUESTA, DOBLE CIEGO Y CONTROLADO CON PLACEBO