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Upregulation of FOXD1 by YAP alleviates senescence and osteoarthritis

ABSTRACT: Cell senescence is a driver of various aging-associated disorders including osteoarthritis. Here, we identified a critical role for Yes-associated protein (YAP), a major effector of Hippo signaling, in maintaining a younger state of human mesenchymal stem cells (MSCs) and ameliorating osteoarthritis in mice. Targeted knockout of YAP in hMSCs resulted in premature cellular senescence. Mechanistically, YAP interacted with TEA domain transcriptional factor (TEAD) to activate forkhead box D1 (FOXD1) expression. YAP deficiency led to the downregulation of FOXD1, a geroprotective protein. In turn, overexpression of YAP or FOXD1 rejuvenated aged hMSCs. Moreover, intra-articular administration of lentiviral vectors encoding YAP or FOXD1 attenuated the development of osteoarthritis in mice. Collectively, our findings reveal YAP-FOXD1, a novel aging-associated regulatory axis, as a potential therapeutic target for gene therapy to alleviate osteoarthritis.

ORGANISM(S): Mus musculus Homo sapiens

PROVIDER: GSE110268 | GEO | 2019/02/17

REPOSITORIES: GEO

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Upregulation of FOXD1 by YAP alleviates senescence and osteoarthritis

Project description:Upregulation of FOXD1 by YAP alleviates senescence and osteoarthritis

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Stabilizing Heterochromatin by DGCR8 Alleviates Senescence and Osteoarthritis

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Stabilizing Heterochromatin by DGCR8 Alleviates Senescence and Osteoarthritis (ChIP-seq)

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Stabilizing Heterochromatin by DGCR8 Alleviates Senescence and Osteoarthritis (RNA-seq)

Project description:DiGeorge syndrome critical region 8 (DGCR8) is a critical component of the canonical microprocessor complex for microRNA biogenesis. However, the non-canonical functions of DGCR8 have not been studied. Here, we demonstrate that DGCR8 plays an important role in maintaining heterochromatin organization and preventing aging. An N-terminal-truncated version of DGCR8 (DR8dex2) accelerated senescence in human mesenchymal stem cells (hMSCs) independent of its miRNA-processing activity, which is mediated by its C-terminal domain. Further studies revealed that DGCR8 maintained heterochromatin organization by interacting with the nuclear envelope protein Lamin B1, and heterochromatin-associated proteins, KAP1 and HP1g expressing of any of these proteins, including DGCR8, reversed premature senescent phenotypes in DR8dex2 hMSCs. Finally, DGCR8 was downregulated in pathological and naturally aged hMSCs, whereas DGCR8 expressing alleviated hMSC aging and osteoarthritis in mice. Taken together, these analyses uncovered a novel, miRNA-independent role for DGCR8 in maintaining heterochromatin organization and preventing senescence. DGCR8 may therefore represent a new therapeutic target for alleviating human aging-related disorders.

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