Homo sapiens
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PROVIDER: PRJNA427395 | ENA |
REPOSITORIES: ENA
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Project description:For studing dynamic transcriptome profiling in DNA damage-induced cellular senescence and transient cell-cycle arrest, samples were treated with the DNA-damaging agent bleomycin at 0 ug/ml, 2 ug/ml and 40 ug/ml for 2 h. High-resolution time course analysis of gene expression in DNA damage-induced cellular senescence and transient cell-cycle arrest was used to explore the transcriptomic differences between different cell fates after DNA damage response.
2018-03-27 | GSE112068 | GEO
Project description:Study of dynamic transcriptome profiling in DNA damage-induced cellular senescence and transient cell-cycle arrest
| PRJNA439216 | ENA
Project description:DallePazze2014 - Cellular senescene-induced
mitochondrial dysfunction
This model is described in the article:
Dynamic modelling of
pathways to cellular senescence reveals strategies for targeted
interventions.
Dalle Pezze P, Nelson G, Otten EG,
Korolchuk VI, Kirkwood TB, von Zglinicki T, Shanley DP.
PLoS Comput. Biol. 2014 Aug; 10(8):
e1003728
Abstract:
Cellular senescence, a state of irreversible cell cycle
arrest, is thought to help protect an organism from cancer, yet
also contributes to ageing. The changes which occur in
senescence are controlled by networks of multiple signalling
and feedback pathways at the cellular level, and the interplay
between these is difficult to predict and understand. To
unravel the intrinsic challenges of understanding such a highly
networked system, we have taken a systems biology approach to
cellular senescence. We report a detailed analysis of
senescence signalling via DNA damage, insulin-TOR, FoxO3a
transcription factors, oxidative stress response, mitochondrial
regulation and mitophagy. We show in silico and in vitro that
inhibition of reactive oxygen species can prevent loss of
mitochondrial membrane potential, whilst inhibition of mTOR
shows a partial rescue of mitochondrial mass changes during
establishment of senescence. Dual inhibition of ROS and mTOR in
vitro confirmed computational model predictions that it was
possible to further reduce senescence-induced mitochondrial
dysfunction and DNA double-strand breaks. However, these
interventions were unable to abrogate the senescence-induced
mitochondrial dysfunction completely, and we identified
decreased mitochondrial fission as the potential driving force
for increased mitochondrial mass via prevention of mitophagy.
Dynamic sensitivity analysis of the model showed the network
stabilised at a new late state of cellular senescence. This was
characterised by poor network sensitivity, high signalling
noise, low cellular energy, high inflammation and permanent
cell cycle arrest suggesting an unsatisfactory outcome for
treatments aiming to delay or reverse cellular senescence at
late time points. Combinatorial targeted interventions are
therefore possible for intervening in the cellular pathway to
senescence, but in the cases identified here, are only capable
of delaying senescence onset.
This model is hosted on
BioModels Database
and identified by:
BIOMD0000000582.
To cite BioModels Database, please use:
BioModels Database:
An enhanced, curated and annotated resource for published
quantitative kinetic models.
To the extent possible under law, all copyright and related or
neighbouring rights to this encoded model have been dedicated to
the public domain worldwide. Please refer to
CC0
Public Domain Dedication for more information.
2015-08-12 | BIOMD0000000582 | BioModels
Project description:Senescent cells are a major cause of organismal aging and a key target for anti-aging therapies. Persistent DNA damage signaling is a primary driver of the induction and maintenance of cellular senescence. However, many DNA damaging stimuli that induce senescence, such as irradiation or transient exposure to genotoxic drugs, are transient. The mechanisms underlying persistent damage signaling in senescent cells, and why senescent cells fail to repair damaged DNA, remain unknown. Here, we were able to assess the mechanisms underlying persistence of DNA damage and senescence maintenance by designing a precisely controllable senescence system that does not require potent stressors to induce senescence. We demonstrate that sustained mTORC1 signaling in senescent cells causes gradually accumulating DNA damage and an inflammatory response that maintains cell-cycle arrest. Markedly, activation of E2F transcription, which promotes expression of DNA repair proteins, can reverse accumulated DNA damage. Thus, persistent DNA damage signaling arises in senescent cells by uncoupling of mTORC1 and E2F signaling, whereby prolonged mTORC1 activity causes gradually increasing DNA damage that cannot be sufficiently repaired without induction of protective E2F target genes.
2023-06-01 | GSE153683 | GEO
Project description:Kollarovic2016 - Cell fate decision at G1-S
transition
This model is described in the article:
To senesce or not to
senesce: how primary human fibroblasts decide their cell fate
after DNA damage.
Kollarovic G, Studencka M, Ivanova
L, Lauenstein C, Heinze K, Lapytsko A, Talemi SR, Figueiredo AS,
Schaber J.
Aging (Albany NY) 2016 Jan;
Abstract:
Excessive DNA damage can induce an irreversible cell cycle
arrest, called senescence, which is generally perceived as an
important tumour-suppressor mechanism. However, it is unclear
how cells decide whether to senesce or not after DNA damage. By
combining experimental data with a parameterized mathematical
model we elucidate this cell fate decision at the G1-S
transition. Our model provides a quantitative and conceptually
new understanding of how human fibroblasts decide whether DNA
damage is beyond repair and senesce. Model and data imply that
the G1-S transition is regulated by a bistable hysteresis
switch with respect to Cdk2 activity, which in turn is
controlled by the Cdk2/p21 ratio rather than cyclin abundance.
We experimentally confirm the resulting predictions that to
induce senescence i) in healthy cells both high initial and
elevated background DNA damage are necessary and sufficient,
and ii) in already damaged cells much lower additional DNA
damage is sufficient. Our study provides a mechanistic
explanation of a) how noise in protein abundances allows cells
to overcome the G1-S arrest even with substantial DNA damage,
potentially leading to neoplasia, and b) how accumulating DNA
damage with age increasingly sensitizes cells for
senescence.
This model is hosted on
BioModels Database
and identified by:
BIOMD0000000632.
To cite BioModels Database, please use:
BioModels Database:
An enhanced, curated and annotated resource for published
quantitative kinetic models.
To the extent possible under law, all copyright and related or
neighbouring rights to this encoded model have been dedicated to
the public domain worldwide. Please refer to
CC0
Public Domain Dedication for more information.
2017-03-30 | BIOMD0000000632 | BioModels
Project description:DNA damage caused by UV radiation initiates cellular recovery mechanisms, which involve activation of DNA damage response pathways, cell cycle arrest and apoptosis. To assess cellular transcriptional responses to UVC-induced DNA damage we compared time course responses of human skin fibroblasts to low and high doses of UVC radiation known to induce a transient cellular replicative arrest or apoptosis, respectively. UVC radiation elicited >3-fold changes in 460 out of 12,000 transcripts and 89% of these represented downregulated transcripts. Only 5% of the regulated genes were common to both low and high doses of radiation. Cells inflicted with a low dose of UVC exhibited transcription profiles demonstrating transient regulation followed by recovery, whereas the responses were persistent after the high dose. A detailed clustering analysis and functional classification of the targets implied regulation of biologically divergent responses and suggested involvement of transcriptional and translational machinery, inflammatory, anti-proliferative and anti-angiogenic responses. The data support the notion that UVC radiation induces prominent, dose-dependent downregulation of transcription. However, the data strongly suggest that transcriptional repression is also target gene selective. Furthermore, the results demonstrate that dose-dependent induction of cell cycle arrest and apoptosis by UVC radiation are transcriptionally highly distinct responses.
2007-09-21 | E-GEOD-713 | biostudies-arrayexpress
Project description:Cellular senescence is a dynamic tumor suppression mechanism that limits the proliferation of impaired cells, by executing a stable cell cycle arrest. Understanding the molecular pathways and regulatory circuits that are involved in the process of senescence is presently incomplete. In this study, we determined the changes in gene expression during the establishment of replicative senescence, by comparing the expression profiles of young and senescent human umbilical vein endothelial cells (HUVECs). Exploration of array data using ingenuity pathway analysis showed that genes involved in cell cycle regulation, cellular assembly and organization, DNA replication, recombination and repair were significantly down regulated during senescence.
2022-01-27 | GSE195517 | GEO
Project description:This is the model described in: Feedback between p21 and reactive oxygen production is necessary for cell senescence.
Passos JF, Nelson G, Wang C, Richter T, Simillion C, Proctor CJ, Miwa S, Olijslagers S, Hallinan J, Wipat A, Saretzki G, Rudolph KL, Kirkwood TB, von Zglinicki T. ;Mol Sys Biol2010;6:347. Epub 2010 Feb 16. PMID:20160708 doi:10.1038/msb.2010.5;
Abstract:
Cellular senescence--the permanent arrest of cycling in normally proliferating cells such as fibroblasts--contributes both to age-related loss of mammalian tissue homeostasis and acts as a tumour suppressor mechanism. The pathways leading to establishment of senescence are proving to be more complex than was previously envisaged. Combining in-silico interactome analysis and functional target gene inhibition, stochastic modelling and live cell microscopy, we show here that there exists a dynamic feedback loop that is triggered by a DNA damage response (DDR) and, which after a delay of several days, locks the cell into an actively maintained state of 'deep' cellular senescence. The essential feature of the loop is that long-term activation of the checkpoint gene CDKN1A (p21) induces mitochondrial dysfunction and production of reactive oxygen species (ROS) through serial signalling through GADD45-MAPK14(p38MAPK)-GRB2-TGFBR2-TGFbeta. These ROS in turn replenish short-lived DNA damage foci and maintain an ongoing DDR. We show that this loop is both necessary and sufficient for the stability of growth arrest during the establishment of the senescent phenotype.
This model originates from BioModels Database: A Database of Annotated Published Models (http://www.ebi.ac.uk/biomodels/). It is copyright (c) 2005-2010 The BioModels.net Team.For more information see the terms of use.To cite BioModels Database, please use: Li C, Donizelli M, Rodriguez N, Dharuri H, Endler L, Chelliah V, Li L, He E, Henry A, Stefan MI, Snoep JL, Hucka M, Le Novère N, Laibe C (2010) BioModels Database: An enhanced, curated and annotated resource for published quantitative kinetic models. BMC Syst Biol., 4:92.
2010-03-01 | BIOMD0000000287 | BioModels
Project description:Immune checkpoint bloackade (ICB)-based or natural cancer immune responses largely eliminate tumours. Yet, they require additional mechanisms to arrest those cancer cells that are not rejected. Cytokine-induced senescence (CIS) can stably arrest cancer cells, suggesting that interferon-dependent induction of senescence-inducing cell cycle regulators is needed to control those cancer cells that escape from killing. Here we report in two different cancers sensitive to T cell-mediated rejection, we show that deletion of the senescence-inducing cell cycle regulators p16Ink4a/p19Arf (Cdkn2a) or p21Cip1 (Cdkn1a) in the tumour cells abrogated both, the natural and the ICB-induced cancer immune control. Also in humans, melanoma metastases that progressed rapidly during ICB have losses of senescence-inducing genes and amplifications of senescence inhibitors. Metastatic cells also resist CIS. Such genetic and functional alterations are infrequent in metastatic melanomas regressing during ICB. Thus, activation of tumour-intrinsic, senescence-inducing cell cycle regulators is required to stably arrest those cancer cells that escape from eradication.
| EGAS00001004151 | EGA
Project description:Cellular senescence is a permanent state of cell cycle arrest that protects the organism from tumorigenesis and regulates tissue integrity upon damage and during tissue remodeling. However, accumulation of senescent cells in tissues during aging contributes to age-related pathologies. A deeper understanding of the mechanisms regulating the viability of senescent cells is therefore required. Here we show that the CDK inhibitor p21 (CDKN1A) maintains the viability of DNA damage-induced senescent cells.
2017-06-13 | GSE98240 | GEO