Dietary restriction delays but cannot heal irradiation-induced hair graying by preserving hair follicle stem cells in quiescence
Ontology highlight
ABSTRACT:
PROVIDER: PRJNA656422 | ENA |
REPOSITORIES: ENA
Dataset's files
| Action | DRS | |||
|---|---|---|---|---|
| SRR12427681.fastq.gz | Fastqsanger.gz | |||
| SRR12427682.fastq.gz | Fastqsanger.gz | |||
| SRR12427683.fastq.gz | Fastqsanger.gz | |||
| SRR12427684.fastq.gz | Fastqsanger.gz | |||
| SRR12427685.fastq.gz | Fastqsanger.gz |
Items per page: 5 1 - 5 of 9 |
Similar Datasets
Project description:DNA damage represents one of the cell intrinsic causes of stem cell aging, which leads to differentiation induced removal of damaged stem cells in skin and blood. Dietary restriction (DR) retards aging across various species including several strains of laboratory mice. Whether, DR has the potential to ameliorate DNA damage driven stem cell exhaustion remains incompletely understood. Here, we show that DR strongly extends the time to hair graying in response to γ–irradiation (IR) induced DNA damage of C57BL/6J mice. The study shows that DR prolongs quiescence of hair follicle stem cells (HFSCs) by silencing gene regulatory networks and metabolic switches that control proliferation and tissue regeneration. DR-mediated prolongation of HSFC quiescence blocks hair growth and prevents the depletion of HFSCs and ckit+ melanoblasts in response to IR. However, prolongation of HSFCs quiescence also leads to a suppression of DNA repair pathways and cannot prevent melanoblast loss and hair graying in the long run, when hair cycling is re- initiated even after extended periods of time. Together, these results support a model indicating that nutrient deprivation can delay but not heal DNA damage driven extinction of HFSCs and melanoblasts by stalling HSFCs in a prolonged state of quiescence coupled with inhibition of DNA repair. Disconnecting these two types of responses to DR could have the potential to delay stem cell aging.
2024-02-21 | GSE156014 | GEO
Project description:Hair follicle stem cell progeny heal blisters while pausing skin development
| PRJNA647733 | ENA
Project description:Injury in adult tissue generally reactivates developmental programs to foster regeneration, but it is not known whether this paradigm applies to growing tissue. Here, by employing blisters, we show that epidermal wounds heal at the expense of skin development. The regenerated epidermis suppresses the expression of tissue morphogenesis genes accompanied by delayed hair follicle (HF) growth. Lineage tracing experiments, cell proliferation dynamics, and mathematical modeling reveal that the progeny of HF junctional zone stem cells, which undergo a morphological transformation, repair the blisters while not promoting HF development. In contrast, the contribution of interfollicular stem cell progeny to blister healing is small. These findings demonstrate that tissue development can be sacrificed for the sake of wound regeneration and suggest that tissue repair does not coincide with the reactivation of developmental programs in all regenerative contexts. Our study elucidates the key cellular mechanism of wound healing in skin blistering diseases.
2021-06-04 | GSE154871 | GEO
Project description:Trial Design:
This is a feasibility randomised controlled trial.
Aim:
The study aims to test the Healthy Eating and Active Lifestyle After Bowel Cancer - HEAL ABC intervention and HEAL ABC resources for feasibility and will inform a future definitive randomised controlled trial (RCT).
Objectives:
1. Is it practical to run HEAL ABC study as a definitive randomised controlled trial?
2. Adherence to intervention, motivations, barriers and facilitators of CRC survivors to follow HEAL ABC.
Study Population:
Colorectal cancer survivors who completed surgery and/or active treatment.
Intervention:
The intervention group will use HEAL ABC resource with supportive telephone calls every two weeks during the intervention period and once a month during the follow up period.
Control:
Participants follow standard care recommendations.
Timing and duration:
3 months intervention with 6 months follow up period
| 2326864 | ecrin-mdr-crc
Project description:Primary outcome(s): Comparison of the gene expression profile in hair follicle between cancer patients and healthy volunteer
| 2628246 | ecrin-mdr-crc
Project description:ObjectiveTo explore disparities in wealth trajectories between divorcees and continuously married individuals including moderation effects of remarriage and gender.BackgroundAmid concerns of long-term economic consequences of divorce, research illustrated that ever-divorced individuals hold less wealth than the married preretirement. However, it remains unclear whether this is a direct result of immediate, lasting divorce-related wealth penalties or whether divorce also leads to long-term wealth accumulation disparities.MethodUsing personal-level, longitudinal wealth data from the Socio-Economic Panel Study, I applied propensity score and exact matching with random-effects growth models to compare wealth trajectories of divorcees and the married. The matching allowed (1) married controls to be assigned a theoretical divorce date for ease of comparability to the treatment group (i.e., divorcees) and (2) the account of a wide range of baseline differences.ResultsWealth differences between ever-divorce and continuously married individuals stem from lasting disadvantage-particularly for housing wealth-generated immediately around divorce rather than a scarring of divorcees' wealth accumulation. Remarriage but particularly gender is relevant moderators. Whereas remarriage moderates net wealth trajectories through housing wealth, gender moderates trajectories through financial wealth.ConclusionDivorce importantly contributes to wealth stratification. Mitigation of divorce-related wealth penalties for both men and women needs to focus on immediate, but lasting costs of divorce particularly regarding homeownership.
| S-EPMC9303434 | biostudies-literature
Project description:Mammals heal faster with imperfect fibrotic scars, while amphibians regenerate slower with scarless wound healing. These observations support the prevailing paradigm that speed of wound closure is inversely related to repair quality. Here we find evidence that this is a false trade-off. In multiple injury models, mice lacking CXCR2 (CXCR2-KO) globally improved both speed and quality of skin wound healing, including hair regeneration. We found CXCR2 primarily expressed in neutrophils, and injury induced neutrophils to secrete neutrophil extracellular traps (NETs). Mice engineered to be specifically deficient in myeloid CXCR2 or NET production partially recreated the phenotype with improved early speed of wound closure. Thus, CXCR2+ neutrophils regulate the speed of wound closure.
2024-10-03 | GSE245864 | GEO
Project description:The mouse auditory organ cochlea contains two types of sound receptors: inner hair cells (IHCs) and outer hair cells (OHCs). Tbx2 is expressed in IHCs but repressed in OHCs, and neonatal OHCs that misexpress Tbx2 transdifferentiate into IHC-like cells. However, the extent of this switch from OHCs to IHC-like cells and the underlying molecular mechanism remain poorly understood. Furthermore, whether Tbx2 can transform fully mature adult OHCs into IHC-like cells is unknown. Here, our single-cell transcriptomic analysis revealed that in neonatal OHCs misexpressing Tbx2, 85.6% of IHC genes, including Slc17a8, are upregulated, but only 38.6% of OHC genes, including Ikzf2 and Slc26a5, are downregulated. This suggests that Tbx2 cannot fully reprogram neonatal OHCs into IHCs. Moreover, Tbx2 also failed to completely reprogram cochlear progenitors into IHCs. Lastly, restoring Ikzf2 expression alleviated the abnormalities detected in Tbx2+ OHCs, which supports the notion that Ikzf2 repression by Tbx2 contributes to the transdifferentiation of OHCs into IHC-like cells. Our study evaluates the effects of ectopic Tbx2 expression on OHC lineage development at distinct stages of either male or female mice and provides molecular insights into how Tbx2 disrupts the gene-expression profile of OHCs. This research also lays the groundwork for future studies on OHC regeneration.Significance Statement Elucidation of the molecular and genetic mechanisms governing the determination and stability of cochlear inner hair cells (IHCs) and outer hair cells (OHCs) should provide valuable insights into the regeneration of damaged IHCs and OHCs. Here, we conditionally overexpress Tbx2 in vivo in cochlear sensory progenitors, neonatal OHCs, or adult OHCs. Our results show that Tbx2 overexpression alone can partially destabilize the OHC fate but cannot fully convert OHCs into IHCs. Specifically, we demonstrate that Ikzf2 repression due to Tbx2 overexpression is one of the key pathways disrupting the OHC fate.
2024-05-21 | GSE233559 | GEO
Project description:Telogen (resting phase) hair follicles are more radioresistant than anagen (growth phase) ones. Irradiation of BALB/c mice in the anagen phase with γ-rays at 6 Gy induced hair follicle dystrophy, whereas irradiation in the telogen phase induced the arrest of hair follicle elongation without any dystrophy after post-irradiation depilation. In contrast, FGF18 was highly expressed in the telogen hair follicles to maintain the telogen phase and also the quiescence of hair follicle stem cells. Therefore, the inhibition of FGF receptor signaling at telogen induced the dystrophy after post-irradiation depilation. In addition, the administration of recombinant FGF18 suppressed cell proliferation in the hair follicles and enhanced the repair of radiation-induced DNA damage, so FGF18 protected the anagen hair follicles against radiation damage to enhance hair regeneration. Moreover, FGF18 reduced the expression of cyclin B1 and cdc2 in the skin and FGF18 signaling induced G2/M arrest in the keratinocyte cell line HaCaT, although no obvious change of the expression of DNA repair genes was detected by DNA microarray analysis. These findings suggest that FGF18 signaling for the hair cycle resting phase causes radioresistance in telogen hair follicles by arresting the proliferation of hair follicle cells.
2017-06-03 | GSE69501 | GEO
Project description:HEAL PRECISION: Human Nociceptor and Spinal Cord Molecular Signature Center
| PRJNA1306683 | ENA