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Tire chemical 6PPD-quinone may worsen bowel disease by targeting the NR1H4 gene in colon cells

Study title: The tire antioxidant derivative 6PPD-quinone exacerbates IBD by targeting NR1H4-mediated lipid metabolism and mitochondrial dysfunction in human colon epithelial cells

Researchers used network toxicology, multi-model machine learning, molecular docking, and in vitro experiments in human intestinal epithelial cells to probe the tire-derived pollutant 6PPD-quinone. The workflow identified 60 overlapping 6PPD-Q-IBD targets and prioritized six core genes, with NR1H4 as a key mediator that binds strongly to 6PPD-Q.

Read the study abstract

N- (1,3-Dimethylbutyl)-N'-phenyl-p-phenylenediamine quinone (6PPD-Q), a tire rubber antioxidant derivative, accumulates in air, soil, and water and has been found in urine, blood, and cerebrospinal fluid, posing significant health risks. Although 6PPD-Q exhibits intestinal toxicity, its role in inflammatory bowel disease (IBD) remains unclear. The objective of this study was to identify key molecular targets of 6PPD-Q in IBD and to validate their involvement in 6PPD-Q-induced intestinal epithelial cell injury. U…

By the Truvace desk1 min read1 sourceEvidence: Moderate · 68/100 — Controlled or validated comparison · 1 independent sourcePeer-reviewedTRV-2026-0998· cite & verify
The tire antioxidant derivative 6PPD-quinone exacerbates IBD by targeting NR1H4-mediated lipid metabolism and mitochondrial dysfunction in human colon epithelial cells
Human Colon Cancer Cells (42301616611) by NIH Image Gallery from Bethesda, Maryland, USA. Public domain

In brief

The work matters because it connects an emerging environmental pollutant found in human biofluids to a plausible IBD mechanism involving lipid droplet and cholesterol accumulation, mitochondrial dysfunction, and inflammatory cytokine upregulation. Uncertainty remains because evidence is computational and cell-based as of the September 2026 publication date, without animal or patient-level IBD outcomes.

Main points

  1. Network toxicology and machine learning identified 60 overlapping 6PPD-Q-IBD targets enriched in lipid metabolism, oxidative stress, and inflammation.
  2. Multi-model machine learning narrowed to six core genes NR1H4, ANXA5, SPARC, PCK1, PDK2, and CFB, with NR1H4 highlighted as key mediator.
  3. Molecular docking showed strong binding of 6PPD-Q to NR1H4, exceeding that of its parent compound.
  4. In vitro validation in human intestinal epithelial cells showed lipid droplet and cholesterol accumulation, mitochondrial dysfunction, and upregulation of IL-6, TNF-alpha, and IL-8 with downregulation of NR1H4.

The gain

Multi-model machine learning screening of 6PPD-Q-IBD targets identified 60 overlapping targets and prioritized six core genes with NR1H4 as a key mediator of intestinal epithelial injury.

The problem

Machine learning-informed toxicology analysis indicates 6PPD-quinone exposure increases IBD risk in human colon epithelial cells by downregulating NR1H4, causing lipid and cholesterol accumulation, mitochondrial dysfunction, and elevated IL-6, TNF-alpha, and IL-8.

The rundown

The study combined network toxicology, machine learning, molecular docking, and cell experiments to investigate the tire antioxidant derivative 6PPD-quinone, which accumulates in air, soil, water and has been found in urine, blood, and cerebrospinal fluid.

Computational screening found 60 overlapping 6PPD-Q-IBD targets and six core genes, with docking showing strong binding of 6PPD-Q to NR1H4 exceeding its parent compound, followed by in vitro confirmation of ATP synthesis inhibition, mitochondrial ROS burst, decreased membrane potential, and mitochondrial fragmentation.

Sources

  1. Peer-reviewedFood and Chemical Toxicology2026-09-04

The debate