Diesel metabolite 1-aminopyrene and kidney cell senescence in lab cells
In lab experiments, the diesel-exhaust metabolite 1-aminopyrene caused DNA damage and senescence in renal tubular epithelial cells, and their secreted factors activated fibroblasts; blocking BRD4 reduced this signaling. [1]
Automatic summary · not editorially reviewed
The key findings
Exposure of renal tubular epithelial cells to sub-cytotoxic 1-aminopyrene caused persistent DNA damage. [1]
Conditioned media from senescent renal tubular epithelial cells promoted activation and extracellular matrix gene expression in renal fibroblasts. [1]
Inhibiting BRD4 suppressed SASP transcription and blocked paracrine fibroblast activation in this cell model. [1]
The source at a glance
- Study type / format
- Laboratory cell-culture study (abstract)
- Population / context
- Cultured renal tubular epithelial cells and renal fibroblasts exposed to 1-aminopyrene in laboratory experiments.
- Summary based on
- Study abstract
- Original publication
- October 1, 2026
Pollution link to kidney fibrosis in lab cells
The abstract notes that epidemiological evidence links environmental pollution to chronic kidney disease, but how diesel-derived pollutants trigger and sustain renal fibrosis is unclear. The study examined 1-aminopyrene (1-AP), a metabolite of diesel exhaust, in renal tubular epithelial cells (RTECs). Exposure to sub-cytotoxic concentrations caused persistent DNA damage, shown by comet assay and γ-H2AX foci. This is laboratory cell work, not a human study.
Supporting source [1]
Senescent RTECs activated fibroblasts via secreted factors
Sustained DNA damage activated p21-mediated cellular senescence, followed by induction of senescence-associated secretory phenotype (SASP) factors: IL-6, IL-1β, CXCL1, MCP-1 and TGF-β1. Conditioned media from senescent RTECs promoted activation and extracellular matrix gene expression in renal fibroblasts, which the authors describe as epithelial-mesenchymal crosstalk driving fibrogenic signaling. Although 1-AP activated the aryl hydrocarbon receptor (AhR), inhibiting AhR did not suppress SASP expression or fibroblast activation.
Supporting source [1]
BRD4 inhibition reduced SASP in this cell model
On the epigenetic level, 1-AP exposure caused chromatin remodeling in RTECs: increased H3K9 acetylation and loss of H3K9me3 and H3K27me3, which facilitated recruitment of the epigenetic reader BRD4 to SASP gene loci. Pharmacological inhibition of BRD4 suppressed SASP transcription, blocked paracrine fibroblast activation and promoted apoptosis of RTECs. The authors suggest BRD4 may be a potential therapeutic target for pollution-related chronic kidney disease. These are cell-culture findings; the abstract reports no human outcomes or treatments.
Supporting source [1]
How to interpret this
Abstract only; the full text was not reviewed. Findings come from cultured renal tubular epithelial cells and fibroblasts, not humans, and the abstract reports no clinical outcomes. The BRD4 target is proposed, not validated as a treatment.
Based on the study abstract; the full paper, tables and supplementary data were not reviewed.
Source & supporting passages
Katarkar A, Bagde A, Maurya D, Chahare B, Mane N, Sivanesan S, Krishnamurthi K. · europepmc.org · October 1, 2026