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    The mechanisms underlying the lipid-lowering effect of nuts remain elusive. This study explores whether one-year supplementation with walnuts decreases LDL-cholesterol (LDL-C) by affecting the expression of circulating microRNAs (c-miRNA). In this sub-study of the Walnuts and Healthy Aging (WAHA) trial, we obtained fasting serum at baseline and at 1 year from 330 free-living participants (63-79 year, 68% women), allocated into a control group (CG, abstinence from walnuts, n = 164) and a walnut group (WG, 15% of daily energy as walnuts, ~30-60 g/d, n = 166). Participants in the WG showed a 1 year decrease in LDL-C (-9.07, (95% confidence interval: -12.87; -5.73) mg/dL; p = 0.010 versus changes in the CG). We conducted a miRNA array in eight randomly selected participants in the WG who decreased in LDL-C. This yielded 53 c-miRNAs with statistically significant changes, 27 of which survived the correction for multiple testing. When validating them in the full population, statistical significance lasted for hsa-miR-551a, being upregulated in the WG. In mediation analysis, the change in hsa-miR-551a was unrelated to LDL-C decrease. Long-term supplementation with walnuts decreased LDL-C independently of the changes in c-miRNA. The hsa-miR-551a upregulation, which has been linked to a reduced cell migration and invasion in several carcinomas, suggests a novel mechanism of walnuts in cancer risk.


    Judit Gil-Zamorano, Montserrat Cofán, María-Carmen López de Las Hazas, Tatiana García-Blanco, Almudena García-Ruiz, Mónica Doménech, Mercè Serra-Mir, Irene Roth, Cinta Valls-Pedret, Sujatha Rajaram, Joan Sabaté, Emilio Ros, Alberto Dávalos, Aleix Sala-Vila. Interplay of Walnut Consumption, Changes in Circulating miRNAs and Reduction in LDL-Cholesterol in Elders. Nutrients. 2022 Apr 01;14(7)

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    PMID: 35406086

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