Donated livers can be made biologically younger
Machine perfusion of donated livers reverses their biological age at the molecular level, making them appear up to 30% younger than chronologically matched non-perfused livers Researchers used two types of "aging clocks"—epigenetic DNA methylation patterns and gene expression profiles—to measure biological age across 122 donated livers Perfusion at 34°C with oxygen and nutrients activates cellular repair pathways, including autophagy (removal of damaged cell parts) and reduces inflammation-relat
Analysis
TL;DR
- Machine perfusion of donated livers reverses their biological age at the molecular level, making them appear up to 30% younger than chronologically matched non-perfused livers
- Researchers used two types of "aging clocks"—epigenetic DNA methylation patterns and gene expression profiles—to measure biological age across 122 donated livers
- Perfusion at 34°C with oxygen and nutrients activates cellular repair pathways, including autophagy (removal of damaged cell parts) and reduces inflammation-related gene activity
- The rejuvenating effect persists even after transplantation into recipients, though biological age increases slightly once blood flow is restored
- Scientists aim to translate these molecular insights into cheaper drug-based therapies that could replicate perfusion's rejuvenating effects without expensive machinery
Why It Matters
This research bridges organ transplantation and aging biology, offering a novel molecular framework for assessing organ viability beyond traditional criteria. For the transplant community, it validates machine perfusion as more than a preservation tool—it actively improves organ quality at the epigenetic and transcriptomic levels. The findings could reshape how organs are evaluated, potentially expanding the donor pool by salvaging organs previously deemed unsuitable.
Technical Details
- Aging clocks employed: The team used DNA methylation-based epigenetic clocks and gene expression-based transcriptional clocks, both validated to predict chronological age and mortality risk, applied to 245 liver biopsy samples from 122 donated livers
- Study design: Livers were stored for up to ~6 hours either in cold storage (on ice) or on machine perfusion; a second biopsy was taken ~1 hour post-transplantation to track changes after revascularization
- Key molecular findings: Perfusion altered pathways related to inflammation, tissue structure, and notably increased activity in autophagy—the cellular recycling mechanism that removes damaged components—suggesting active molecular repair during perfusion
- Quantified effect: After adjusting for chronological age, perfused livers showed a ~30% reduction in biological age compared to cold-stored livers; this effect endured post-transplant despite a post-implantation age increase
- Donor demographics: Organs came from donors in their 30s–50s; the effect on older donors (70–85 years) remains untested and is a noted gap
Industry Insight
- Cost reduction opportunity: Machine perfusion costs $80,000–$100,000 per organ in the US; understanding the molecular mechanisms could enable pharmacological alternatives at a fraction of the cost, dramatically improving organ utilization rates
- New organ quality metrics: Biological age measured via aging clocks could become a standardized pre-transplant assessment tool, complementing or replacing current functional assessments and helping clinicians decide which "marginal" organs to accept
- Expanded donor eligibility: If drug-based rejuvenation therapies can replicate perfusion effects, organs from older donors (currently underutilized) could become viable, addressing the critical shortage of transplantable organs and saving more lives
Disclaimer: The above content is generated by AI and is for reference only.