Oxidative stress induces imbalance of adipogenic/osteoblastic lineage commitment in mesenchymal stem cells through decreasing SIRT1 functions.

Abstract

With rapidly ageing populations worldwide, the incidence of osteoporosis has reached epidemic proportions. Reactive oxygen species (ROS), a by-product of oxidative stress and ageing, has been thought to induce osteoporosis by inhibiting osteogenic differentiation of mesenchymal stem cells (MSCs). However, specific mechanisms of how ROS results in alterations on MSC differentiation capacity have been inconsistently reported. We found that H2 O2 , an ROS, simultaneously induced MSC lineage commitment towards adipogenesis and away from osteogenesis at the functional as well as transcriptional level. In addition, H2 O2 decreased the activities of SIRT1, a histone deacetylase and longevity gene. By silencing and reconstituting SIRT1 in MSCs, we demonstrated that H2 O2 exerted its disparate effects on adipogenic/osteoblastic lineage commitment mainly through modulating SIRT1 expression levels. Treatment with resveratrol, a SIRT1 agonist, can also reverse this ROS-induced adipogenesis/osteogenesis lineage imbalance. Moreover, SIRT1 regulation of RUNX2 transcriptional activity was mediated through deacetylation of the ROS-sensitive transcription factor FOXO3a. Taken together, our data implicate SIRT1 as playing a vital role in ROS-directed lineage commitment of MSCs by modulating two lineages simultaneously. Our findings on the critical role of SIRT1 in ROS/age-related perturbations of MSC differentiation capacity highlight this molecule as a target for maintenance of MSC stemness as well as a potential anabolic target in osteoporosis.

• Authors: Chia-Hua Lin, Nan-Ting Li, Hui-Shan Cheng, Men-Luh Yen
• Journal: Journal of cellular and molecular medicine (J Cell Mol Med) Vol. 22 Issue 2 Pg. 786-796 (02 2018) ISSN: 1582-4934 [Electronic] England
• PMID: 28975701 (Publication Type: Journal Article, Research Support, Non-U.S. Gov't)
• Copyright: © 2017 The Authors. Journal of Cellular and Molecular Medicine published by John Wiley & Sons Ltd and Foundation for Cellular and Molecular Medicine.

Chemical References

• Core Binding Factor Alpha 1 Subunit
• Forkhead Box Protein O3
• FoxO3 protein, mouse
• Hydrogen Peroxide
• Sirtuin 1
• Resveratrol

Topics

• Acetylation
• Adipogenesis (drug effects, genetics)
• Animals
• Cell Line
• Cell Lineage (drug effects, genetics)
• Core Binding Factor Alpha 1 Subunit (metabolism)
• Forkhead Box Protein O3 (metabolism)
• Humans
• Hydrogen Peroxide (toxicity)
• Mesenchymal Stem Cells (drug effects, metabolism, pathology)
• Mice
• Models, Biological
• Osteoblasts (drug effects, metabolism, pathology)
• Osteogenesis (drug effects, genetics)
• Oxidative Stress (drug effects)
• Resveratrol (pharmacology)
• Sirtuin 1 (metabolism)
• Transcription, Genetic (drug effects)