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- W4366985995 abstract "Abstract Human mesenchymal stem cells (hMSCs) are multipotent cells that can differentiate into adipocytes, chondrocytes and osteoblasts. Due to their differentiation potential, hMSCs are among the most frequently used cells for therapeutic applications in tissue engineering and regenerative medicine. However, the number of cells obtained through isolation alone is insufficient for hMSC-based therapies and basic research, necessitating their in-vitro expansion. Conventionally, this is often carried out on rigid surfaces such as tissue culture petriplates (TCPs). However, during in-vitro expansion, hMSCs lose their proliferative ability and multilineage differentiation potential, making them unsuitable for clinical use. Although multiple approaches have been tried to maintain hMSC stemness over prolonged expansion, finding a suitable culture system to achieve this remains an unmet need. Recently, few research groups including ours have shown that hMSCs maintain their stemness over long passages when cultured on soft substrate. In addition, it has been shown that hMSCs cultured on soft substrates have more condensed chromatin and lower levels of histone acetylation compared to those cultured on stiff substrates. It has also been shown that condensing/decondensing chromatin by deacetylation/acetylation can delay/hasten replicative senescence in hMSCs during long-term expansion on TCPs. However, how chromatin condensation/decondensation influences nuclear morphology and DNA damage - which are strongly related to the onset of senescence and cancer - is still not known. To answer this question, here we cultured hMSCs for long duration (P4-P11) in presence of epigenetic modifiers histone acetyltransferase inhibitor (HATi) which promotes chromatin condensation by preventing histone acetylation and histone deacetylase inhibitor (HDACi) which promotes chromatin decondensation and investigated their effect on various nuclear markers related to senescence and cancer. We have found that consistent acetylation causes severe nuclear abnormalities whereas chromatin condensation by deacetylation helps in safeguarding nucleus from damages caused by in-vitro expansion." @default.
- W4366985995 created "2023-04-27" @default.
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- W4366985995 date "2023-04-25" @default.
- W4366985995 modified "2023-09-29" @default.
- W4366985995 title "Chromatin condensation delays human mesenchymal stem cells senescence by safeguarding nuclear damages during long term<i>in vitro</i>expansion" @default.
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- W4366985995 doi "https://doi.org/10.1101/2023.04.22.537784" @default.
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