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Related Concept Videos

Overview of Regeneration and Repair01:19

Overview of Regeneration and Repair

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.
Regeneration
All animals have varying degrees of...
Whole Body Regeneration01:33

Whole Body Regeneration

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; even...
Neurogenesis and Regeneration of Nervous Tissue01:15

Neurogenesis and Regeneration of Nervous Tissue

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...
Tissue Renewal without Stem Cells01:23

Tissue Renewal without Stem Cells

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.
However, failure of such a system...
Liver Regeneration01:24

Liver Regeneration

The liver is an important organ in vertebrates that plays an essential role in metabolism. It is also responsible for storing and redistributing nutrients such as carbohydrates, fats, and vitamins in the body. Additionally, the liver releases bile salts which are critical for digesting food and eliminating toxic metabolites from the body.
Cells of Liver
The liver comprises four major types of cells— hepatocytes, stellate, Kupffer, and sinusoidal endothelial cells. The hepatocytes are large...
Healing I: Introduction01:11

Healing I: Introduction

Healing is the physiological process by which the body restores the integrity and function of damaged tissues following injury. It involves a coordinated interplay of cellular proliferation, extracellular matrix remodeling, and growth factor signaling. The extent and nature of the tissue damage determine whether healing occurs by resolution, regeneration, or replacement.ResolutionResolution represents the most complete form of healing, occurring when the injury is minimal and tissue...

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Related Experiment Video

Updated: May 24, 2026

Capturing Tissue Repair in Zebrafish Larvae with Time-lapse Brightfield Stereomicroscopy
14:29

Capturing Tissue Repair in Zebrafish Larvae with Time-lapse Brightfield Stereomicroscopy

Published on: January 31, 2015

Salamanders and fish can regenerate lost structures--why can't we?

Hans-Georg Simon1

  • 1Department of Pediatrics, Northwestern University, The Feinberg School of Medicine, Children's Memorial Research Center, 2300 Children's Plaza, Chicago, IL 60614, USA. hgsimon@northwestern.edu

BMC Biology
|February 29, 2012
PubMed
Summary

New research challenges the idea that dedifferentiation drives all vertebrate tissue regeneration. It suggests a revised perspective on how blastemal cells originate during muscle repair, impacting our understanding of regeneration.

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Last Updated: May 24, 2026

Capturing Tissue Repair in Zebrafish Larvae with Time-lapse Brightfield Stereomicroscopy
14:29

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Published on: January 31, 2015

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Generation of Chimeric Axolotls with Mutant Haploid Limbs Through Embryonic Grafting
07:17

Generation of Chimeric Axolotls with Mutant Haploid Limbs Through Embryonic Grafting

Published on: January 29, 2020

Area of Science:

  • Developmental Biology
  • Regenerative Medicine
  • Cell Biology

Background:

  • The traditional view posits complete dedifferentiation as key to vertebrate tissue regeneration.
  • Recent in vivo lineage-tracing studies using fluorescently labeled cells have questioned this long-standing model.
  • Understanding the origin of blastemal cells is crucial for advancing regenerative strategies.

Purpose of the Study:

  • To re-evaluate the mechanisms underlying vertebrate tissue regeneration.
  • To explore the origin of blastemal cells in light of new lineage-tracing evidence.
  • To propose a revised perspective on muscle regeneration.

Main Methods:

  • Integration of classic experimental findings with recent in vivo lineage-tracing data.
  • Analysis of cellular origins during tissue repair processes.
  • Comparative review of existing literature on regeneration.

Main Results:

  • Evidence suggests that complete dedifferentiation may not be the sole driver of regeneration.
  • A novel perspective on the origin of blastemal cells is emerging.
  • The findings necessitate a re-evaluation of established regeneration models.

Conclusions:

  • Vertebrate muscle regeneration likely involves more complex mechanisms than previously thought.
  • The study contributes to a rapidly evolving understanding of blastemal cell origins.
  • A new framework for studying tissue regeneration is proposed.