Regeneration & Repair

Defining Regeneration and Repair

Regeneration refers to the restoration of lost or damaged structures with a return to original tissue architecture, while repair often results in partial restoration and scar formation. Both processes are fundamental to tissue maintenance, but they differ in fidelity, cellular programs, and outcomes across species and tissues. [1] [2]

Why Regeneration Matters for Ageing Biology

Regenerative capacity influences how organisms maintain function over time. Comparative studies show that species with extensive regeneration can replace structures that mammals typically repair, providing a framework for understanding biological limits on tissue renewal. Evidence from model organisms is substantial, while translation to human biology remains uncertain. [3] [4]

Age-Related Decline in Regenerative Capacity

Many tissues show reduced regenerative responses with age, including slower wound healing and diminished stem cell activity. These changes are linked to shifts in cellular environment, inflammation, and systemic signaling, suggesting that ageing affects both intrinsic cell programs and external cues. [5] [6]

Topics in This Section

Subpages explore regeneration across mechanisms, species, and constraints:

• What Is Biological Regeneration?
• Regeneration vs Repair
• Why Regenerative Capacity Declines With Age
• Regeneration Across Species
• Evolutionary Trade-Offs in Regeneration
• Stem Cells in Regeneration
• Tissue Niches and Regenerative Capacity
• Model Systems in Regeneration Research
• Teeth Regeneration: A Model System for Studying Human Regenerative Limits

References

1. Gurtner, G. C. et al. "Wound repair and regeneration." Nature (2008). https://www.nature.com/articles/nature07039
2. Eming, S. A., Martin, P., Tomic-Canic, M. "Wound repair and regeneration: mechanisms, signaling, and translation." Science Translational Medicine (2014). https://www.science.org/doi/10.1126/scitranslmed.3009337
3. Brockes, J. P., Kumar, A. "Comparative aspects of animal regeneration." Annual Review of Cell and Developmental Biology (2008). https://www.annualreviews.org/doi/10.1146/annurev.cellbio.24.110707.175336
4. Tanaka, E. M., Reddien, P. W. "The cellular basis for animal regeneration." Developmental Cell (2011). https://www.sciencedirect.com/science/article/pii/S1534580711002983
5. Rando, T. A. "Stem cells, ageing and the quest for immortality." Nature (2006). https://www.nature.com/articles/nature04958
6. Conboy, I. M., Rando, T. A. "Aging, stem cells and tissue regeneration: lessons from muscle." Cell Stem Cell (2012). https://www.sciencedirect.com/science/article/pii/S1934590912004184