Mouse and cell study: UVA-linked keratinocyte senescence via USP10-SIRT6-PARP1
In mice under chronic UVA and in cultured human keratinocytes, UVA lowered USP10 and SIRT6, overactivated PARP1 and drove keratinocyte senescence with inflammatory signalling; the SIRT6 agonist UBCS039 reversed these changes in vivo and in vitro. [1]
Automatic summary · not editorially reviewed
The key findings
In a chronic UVA mouse model and cultured human keratinocytes, UVA caused DNA damage and G2/M arrest and selectively depleted SIRT6 among sirtuin family members. [1]
UVA suppressed USP10, permitting proteasomal SIRT6 degradation; the resulting SIRT6 deficiency hyperactivated PARP1 and drove keratinocytes into senescence with inflammatory signalling. [1]
The SIRT6 agonist UBCS039 reversed epidermal hyperplasia and reduced DNA damage, senescence markers and inflammatory mediators in vivo and in vitro; osthole was identified as a candidate SIRT6-engaging compound. [1]
The source at a glance
- Study type / format
- Abstract of a preclinical study in mice and cultured human cells.
- Population / context
- Mice under chronic UVA irradiation and cultured human keratinocytes.
- Summary based on
- Study abstract
- Original publication
- July 31, 2026
Chronic UVA in mice and human keratinocytes
The abstract describes a chronic UVA irradiation model in mice combined with cultured human keratinocytes. UVA caused extensive DNA damage and G2/M cell-cycle arrest, and among all sirtuin family members SIRT6 was selectively depleted. The authors frame chronic UVA as the principal environmental driver of skin photoaging and ask which upstream events commit irradiated keratinocytes to senescence.
Supporting source [1]
USP10 loss, SIRT6 degradation and PARP1 hyperactivation
Mechanistically, UVA suppressed the deubiquitinase USP10 at transcriptional and post-transcriptional levels, which the authors say permits ubiquitin-dependent proteasomal degradation of SIRT6. The resulting SIRT6 deficiency unleashed hyperactivation of the DNA-damage sensor PARP1, amplifying genomic injury signalling and driving keratinocytes into irreversible senescence with a broad pro-inflammatory secretory programme of chemokines and cytokines. The authors describe a USP10-SIRT6-PARP1 signalling axis.
Supporting source [1]
UBCS039 reversal and osthole as candidate compound
Pharmacological reactivation of SIRT6 with the selective agonist UBCS039 reversed epidermal hyperplasia, attenuated DNA damage and senescence marker accumulation, and suppressed inflammatory mediator induction both in vivo and in vitro; the authors call SIRT6 loss causal rather than correlative. Molecular docking and functional validation identified osthole, a plant-derived coumarin from Cnidium monnieri, as a candidate SIRT6-engaging compound that counteracts UVA-induced senescence and inflammation in keratinocytes. The abstract suggests SIRT6-directed strategies may offer therapeutic benefit against UV-driven tissue degeneration.
Supporting source [1]
How to interpret this
This is an abstract; the full text was not reviewed. Findings come from a mouse chronic UVA model and cultured human keratinocytes, not human skin or lifespan outcomes. Osthole is a candidate compound from docking and functional validation, not an established treatment.
Based on the study abstract; the full paper, tables and supplementary data were not reviewed.
Source & supporting passages
Zhang Y, Zuo X, Hou X, Zhang C, Zhang J. · europepmc.org · July 31, 2026