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• W2952206265 endingPage "e0204784" @default.
• W2952206265 startingPage "e0204784" @default.
• W2952206265 abstract "Delaying replicative senescence and extending lifespan of human mesenchymal stromal cells (MSCs) may enhance their potential for tissue engineering and cell based therapies. Accumulating evidence suggests that inhibitors of the mTOR signaling pathway, such as rapamycin, constitute promising pharmacological agents to retard senescence and extend stemness properties of various progenitor cell types. Here, we investigated whether the ability of rapamycin to postpone replicative senescence varies among bone marrow MSC samples (BM-MSCs) derived from different healthy donors, and explored the molecular mechanisms that drive rapamycin-mediated lifespan increment.BM-MSCs at early passages were serially passaged either in absence or continuous presence of rapamycin and the number of cell population doublings until growth arrest was measured. The inhibition of mTOR signaling was assessed by the phosphorylation status of the downstream target RPS6. The expression levels of several senescence and pluripotency markers at early and late/senescent passages were analyzed by RT-qPCR, flow cytometry and western blot.We found that the lifespan extension in response to the continuous rapamycin treatment was highly variable among samples, but effective in most BM-MSCs. Despite all rapamycin-treated cells secreted significantly reduced levels of IL6, a major SASP cytokine, and expressed significantly higher levels of the pluripotency marker NANOG, the expression patterns of these markers were not correlated with the rapamycin-mediated increase in lifespan. Interestingly, rapamycin-mediated life-span extension was significantly associated only with repression of p16INK4A protein accumulation.Taken together, our results suggest that some, but not all, BM-MSC samples would benefit from using rapamycin to postpone replicative arrest and reinforce a critical role of p16INK4A protein downregulation in this process." @default.
• W2952206265 created "2019-06-27" @default.
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• W2952206265 date "2019-01-31" @default.
• W2952206265 modified "2023-10-16" @default.
• W2952206265 title "Individual response to mTOR inhibition in delaying replicative senescence of mesenchymal stromal cells" @default.
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• W2952206265 doi "https://doi.org/10.1371/journal.pone.0204784" @default.
• W2952206265 hasPubMedCentralId "https://www.ncbi.nlm.nih.gov/pmc/articles/6354956" @default.
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• W2952206265 hasPublicationYear "2019" @default.
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