Adhesion-mediated mechanosignaling forces mitohormesis
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ABSTRACT:
PROVIDER: PRJNA718277 | ENA |
REPOSITORIES: ENA
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Project description:Mitochondria control eukaryotic cell fate by producing the energy needed to support life and the signals required to execute programmed cell death. The biochemical milieu is known to affect mitochondrial function and contribute to the dysfunctional mitochondrial phenotypes implicated in cancer and the morbidities of ageing. However, the physical characteristics of the extracellular matrix are also altered in cancer and in aging tissues. We demonstrate that cells sense the physical properties of the extracellular matrix and activate a mitochondrial stress response that adaptively tunes mitochondrial function via SLC9A1-dependent ion exchange and HSF1-dependent transcription. Overall, our data indicate that adhesion-mediated mechanosignaling may play an unappreciated role in the altered mitochondrial functions observed in aging and cancer.
2021-05-22 | GSE171076 | GEO
Project description: Not available
| S-EPMC8266765 | biostudies-literature
Project description:Macrophages generate mitochondrial reactive oxygen and electrophilic species (mtROS, mtRES) as antimicrobials during Toll-like receptor (TLR)-dependent inflammatory responses. Whether mitochondrial stress caused by these molecules impacts macrophage function is unknown. Here, we demonstrate that both pharmacologically- and lipopolysaccharide (LPS)-driven mitochondrial stress in macrophages triggers a stress response called mitohormesis. LPS-driven mitohormetic stress adaptations occur as macrophages transition from an LPS-responsive to LPS-tolerant state where stimulus-induced proinflammatory gene transcription is impaired, suggesting tolerance is a product of mitohormesis. Indeed, like LPS, hydroxyestrogen-triggered mitohormesis suppresses mitochondrial oxidative metabolism and acetyl-CoA production needed for histone acetylation and proinflammatory gene transcription, and is sufficient to enforce an LPS-tolerant state. Thus, mtROS and mtRES are TLR-dependent signaling molecules that trigger mitohormesis as a negative feedback mechanism to restrain inflammation via tolerance. Moreover, bypassing TLR signaling and pharmacologically triggering mitohormesis represents a novel anti-inflammatory strategy that co-opts this stress response to impair epigenetic support of proinflammatory gene transcription by mitochondria.
2021-04-04 | GSE169729 | GEO
Project description:Macrophages generate mitochondrial reactive oxygen and electrophilic species (mtROS, mtRES) as antimicrobials during Toll-like receptor (TLR)-dependent inflammatory responses. Whether mitochondrial stress caused by these molecules impacts macrophage function is unknown. Here, we demonstrate that both pharmacologically- and lipopolysaccharide (LPS)-driven mitochondrial stress in macrophages triggers a stress response called mitohormesis. LPS-driven mitohormetic stress adaptations occur as macrophages transition from an LPS-responsive to LPS-tolerant state where stimulus-induced proinflammatory gene transcription is impaired, suggesting tolerance is a product of mitohormesis. Indeed, like LPS, hydroxyestrogen-triggered mitohormesis suppresses mitochondrial oxidative metabolism and acetyl-CoA production needed for histone acetylation and proinflammatory gene transcription, and is sufficient to enforce an LPS-tolerant state. Thus, mtROS and mtRES are TLR-dependent signaling molecules that trigger mitohormesis as a negative feedback mechanism to restrain inflammation via tolerance. Moreover, bypassing TLR signaling and pharmacologically triggering mitohormesis represents a novel anti-inflammatory strategy that co-opts this stress response to impair epigenetic support of proinflammatory gene transcription by mitochondria.
2021-04-04 | GSE169727 | GEO
Project description:Macrophages generate mitochondrial reactive oxygen and electrophilic species (mtROS, mtRES) as antimicrobials during Toll-like receptor (TLR)-dependent inflammatory responses. Whether mitochondrial stress caused by these molecules impacts macrophage function is unknown. Here, we demonstrate that both pharmacologically- and lipopolysaccharide (LPS)-driven mitochondrial stress in macrophages triggers a stress response called mitohormesis. LPS-driven mitohormetic stress adaptations occur as macrophages transition from an LPS-responsive to LPS-tolerant state where stimulus-induced proinflammatory gene transcription is impaired, suggesting tolerance is a product of mitohormesis. Indeed, like LPS, hydroxyestrogen-triggered mitohormesis suppresses mitochondrial oxidative metabolism and acetyl-CoA production needed for histone acetylation and proinflammatory gene transcription, and is sufficient to enforce an LPS-tolerant state. Thus, mtROS and mtRES are TLR-dependent signaling molecules that trigger mitohormesis as a negative feedback mechanism to restrain inflammation via tolerance. Moreover, bypassing TLR signaling and pharmacologically triggering mitohormesis represents a novel anti-inflammatory strategy that co-opts this stress response to impair epigenetic support of proinflammatory gene transcription by mitochondria.
2021-04-04 | GSE169728 | GEO
Project description:Macrophages generate mitochondrial reactive oxygen and electrophilic species (mtROS, mtRES) as antimicrobials during Toll-like receptor (TLR)-dependent inflammatory responses. Whether mitochondrial stress caused by these molecules impacts macrophage function is unknown. Here, we demonstrate that both pharmacologically- and lipopolysaccharide (LPS)-driven mitochondrial stress in macrophages triggers a stress response called mitohormesis. LPS-driven mitohormetic stress adaptations occur as macrophages transition from an LPS-responsive to LPS-tolerant state where stimulus-induced proinflammatory gene transcription is impaired, suggesting tolerance is a product of mitohormesis. Indeed, like LPS, hydroxyestrogen-triggered mitohormesis suppresses mitochondrial oxidative metabolism and acetyl-CoA production needed for histone acetylation and proinflammatory gene transcription, and is sufficient to enforce an LPS-tolerant state. Thus, mtROS and mtRES are TLR-dependent signaling molecules that trigger mitohormesis as a negative feedback mechanism to restrain inflammation via tolerance. Moreover, bypassing TLR signaling and pharmacologically triggering mitohormesis represents a novel anti-inflammatory strategy that co-opts this stress response to impair epigenetic support of proinflammatory gene transcription by mitochondria.
2021-04-04 | GSE169730 | GEO
Project description:Mitohormesis defines the increase in fitness mediated by adaptive responses to a mild mitochondrial stress. Tetracyclines inhibit not only bacterial but also mitochondrial translation, thus imposing a low level of mitochondrial stress to eukaryotic cells. We show here that the mitochondrial stress response induced by 2 tetracyclins (Tet1, Tet2) improves survival and disease tolerance against lethal influenza virus (IFV) infection. Tolerance to IFV infection is associated with the induction of genes involved in lung epithelial cell and cilia function and with the down-regulation of inflammatory and immune related gene sets in the lung, liver, and kidney.
2022-09-14 | GSE174124 | GEO
Project description:Our study investigates the effects of cell adhesion and traction forces on reprogramming by utilizing a human fibroblast cell line (hiF-T) that can be reprogrammed by activating the expression of an OKSM (OCT4, KLF4, SOX2, C-MYC) gene cassette through the addition of doxycycline. We performed RNA interference experiments on 103 genes found in the ‘adhesome’ (encoding integrins, cadherins, and associated proteins) that are expressed and dynamically regulated (6-fold or more) across the reprogramming timeline. The impact of each shRNA on iPSC generation efficiency was assessed by immunostaining for TRA-1-60, a known pluripotency marker. From this RNAi screen, we identified the SHROOM3 knockdown as a potent reprogramming efficiency enhancer and generated RNA-seq timelines throughout reprogramming with or without shRNAs targeting SHROOM3 or a LacZ control. Gene co-expression network analysis highlights the existence of a critical state transition regulated through a SHROOM3-SRF signaling axis during late reprogramming, which coincides with cell-mediated force generation. Taken together, our data suggest that adhesome gene expression acts as a significant impediment to somatic cell reprogramming through the activation of mechano-signaling pathways associated with cell traction forces. These results provide important new insights into the role of cell adhesion and force generation during reprogramming to pluripotency and somatic cell fate transitions more broadly.
2023-04-10 | GSE148580 | GEO
Project description:Mitohormesis reprograms macrophage metabolism to enforce tolerance.
| PRJNA717764 | ENA
Project description: Not available
| S-EPMC5417443 | biostudies-literature