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Related Concept Videos

Whole Body Regeneration01:33

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Regeneration is the process of restoring injured or lost tissues, organs, or body parts. While simpler organisms generally show greater ability to regenerate their whole body, few complex animals show similarly exceptional regeneration. For example, planarian flatworms have a unique regenerative potential making them a popular study organism among biologists to understand the mechanisms of whole body regeneration. Other organisms, such as hydra, also show extreme regeneration potential;...
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Regeneration and repair processes are critical in healing damages caused by injury, disease, and aging. In regeneration, the damaged tissue is entirely replaced with new growth that restores the original architecture and function. In contrast, tissue repair usually results in a fixed tissue architecture involving scar formation. Scars generally do not reestablish tissue function and may also exhibit structural abnormalities at the injury site.
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After cellular or tissue damage, the resident stem cells present in the human body can locally repair and regenerate the damaged tissue or organ. However, even though some tissues do not have stem cells, they can repair and regenerate with the help of pre-existing cells. For example, beta cells of the pancreas and hepatocytes of the liver can divide to renew and regenerate the tissue. Here, both cell division and cell death are well regulated by homeostasis.
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In the CNS, neurogenesis, the birth of new neurons from stem cells, is limited to the hippocampus in adults. In other regions of the brain and spinal cord, neurogenesis is almost non-existent due to inhibitory influences from neuroglia, especially oligodendrocytes, and the absence of growth-stimulating cues. The myelin produced by oligodendrocytes in the CNS inhibits neuronal regeneration. Furthermore, astrocytes proliferate rapidly after neuronal damage, forming scar tissue that physically...
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Stem cell therapy is a method used in regenerative medicine to repair and restore function to damaged tissues and organs. Stem cells have the potential to proliferate and differentiate into various tissue types, making them ideal candidates for tissue regeneration. For example, hematopoietic stem cell transplants are commonly used in blood cancer treatment to replenish damaged bone marrow and restore healthy blood cells.
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Updated: Oct 19, 2025

Inducing Complete Polyp Regeneration from the Aboral Physa of the Starlet Sea Anemone Nematostella vectensis
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Explaining Regeneration: Cells and Limbs as Complex Living Systems, Learning From History.

Kate MacCord1,2, Jane Maienschein1,2

  • 1School of Life Sciences, Arizona State University, Tempe, AZ, United States.

Frontiers in Cell and Developmental Biology
|September 17, 2021
PubMed
Summary

Historical analysis offers a new perspective on regeneration, moving beyond model organisms to understand this vital biological process for regenerative medicine. Studying history can reveal limitations in current research and guide future advancements.

Keywords:
Morganblastemacomplex living systemsgeneralizabilitymodel organismsreductionismregeneration

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Area of Science:

  • Regenerative biology
  • History of science
  • Evolutionary biology

Background:

  • Regeneration research historically focuses on gene expression and cell signaling in model organisms.
  • Evolutionary assumptions suggest cross-species generalizability of regeneration mechanisms.
  • Despite advances, translating findings to human regenerative medicine remains a challenge.

Purpose of the Study:

  • To explore the historical perspective of regeneration research.
  • To identify limitations in current reductionist approaches.
  • To propose a shift toward broader generalizations for advancing regenerative medicine.

Main Methods:

  • Historical analysis of regeneration research.
  • Review of scientific literature and philosophical assumptions.
  • Comparative study of historical and contemporary approaches.

Main Results:

  • Historical investigation reveals evolving paradigms in regeneration research.
  • Current focus on model organisms may limit broader understanding.
  • A historical perspective can uncover overlooked assumptions and limitations.

Conclusions:

  • Historical insights are crucial for advancing regenerative medicine.
  • Moving beyond a sole focus on model organisms is necessary for generalization.
  • Integrating historical perspectives can foster innovation in harnessing human regenerative potential.