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Related Concept Videos

Whole Body Regeneration01:33

Whole Body Regeneration

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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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In humans, the photoreceptor cells of the eye and sensory hair cells of the ear lack stem cells. These cells are thus unrenewable and cannot be replaced when they are damaged or destroyed.
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Related Experiment Video

Updated: Mar 7, 2026

Surgical Ablation Assay for Studying Eye Regeneration in Planarians
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Surgical Ablation Assay for Studying Eye Regeneration in Planarians

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Eye Absence Does Not Regulate Planarian Stem Cells during Eye Regeneration.

Samuel A LoCascio1, Sylvain W Lapan2, Peter W Reddien2

  • 1Whitehead Institute for Biomedical Research, Cambridge, MA 02142, USA; Department of Brain and Cognitive Sciences, Massachusetts Institute of Technology (MIT), Cambridge, MA 02139, USA; Howard Hughes Medical Institute, MIT, Cambridge, MA 02139, USA.

Developmental Cell
|March 2, 2017
PubMed
Summary

Planarian flatworm regeneration involves pluripotent stem cells called neoblasts. Contrary to expectations, neoblasts do not directly sense missing eye tissue; regeneration is influenced by injury size and type, not just tissue absence.

Keywords:
eyeneoblastplanarianprogenitorregenerationstem celltarget blindtissue turnover

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Area of Science:

  • Developmental Biology
  • Stem Cell Biology
  • Regenerative Medicine

Background:

  • Planarian flatworms possess remarkable regenerative capabilities driven by pluripotent stem cells known as neoblasts.
  • A key question in regeneration research is whether neoblasts directly sense and respond to specific missing tissues.

Purpose of the Study:

  • To investigate whether neoblasts directly sense and respond to the absence of eye tissue during planarian regeneration.
  • To elucidate the regulatory mechanisms governing eye progenitor production in response to different injury types.

Main Methods:

  • Utilizing the planarian eye as a model system to study stem cell responses to injury.
  • Comparing neoblast behavior and eye progenitor production following eye removal versus decapitation and large head injuries.

Main Results:

  • Eye removal alone was insufficient to increase eye progenitor production, indicating neoblasts do not directly sense missing eye tissue.
  • Decapitation, a major injury, induced increased eye progenitor production, while eye-specific resection relied on homeostatic rates and reduced cell death.
  • Large injuries, even those leaving eyes intact, stimulated non-specific progenitor production across multiple tissues.

Conclusions:

  • Planarian eye regeneration is not directly regulated by the absence of the eye itself.
  • Neoblast response appears to be modulated by the overall injury context and size rather than the specific identity of the missing tissue.