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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 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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Blebs are a type of membrane protrusion formed by the internal hydrostatic pressure of the cytoplasm. Blebs are observed in several cell types, including fibroblasts, immune cells, and single-celled organisms like the amoeba. The primary function of blebs is cell locomotion and apoptosis, but they are also found during necrosis and cell division. The life cycle of a bleb comprises an initiation phase followed by the expansion and retraction phases.
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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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Cell size is a significant factor impacting cellular design, function, and fitness. There exists some internal coordination by which cells double their masses before division, thus, achieving homeostasis. Coordination between cell growth and proliferation depends on the checkpoints in between cell cycle phases. Loss of coordination or failure in the checkpoint mechanism can drive the cell to uncontrolled growth and loss of cellular function. Like dividing cells that coordinate cellular growth,...
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Related Experiment Video

Updated: Oct 20, 2025

Three-dimensional Tissue Engineered Aligned Astrocyte Networks to Recapitulate Developmental Mechanisms and Facilitate Nervous System Regeneration
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Axon Regeneration: A Subcellular Extension in Multiple Dimensions.

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Axon regeneration is crucial for restoring neuronal communication after damage. This review summarizes progress and challenges in promoting axon repair, particularly in the central nervous system.

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Area of Science:

  • Neuroscience
  • Cell Biology
  • Regenerative Medicine

Background:

  • Axons are vital for neuronal communication; damage leads to functional deficits.
  • Understanding spontaneous regeneration in some neurons informs repair strategies.
  • The adult mammalian central nervous system presents significant barriers to axon regeneration.

Purpose of the Study:

  • To review historical progress in axon regeneration research.
  • To summarize current understanding of neuronal repair mechanisms.
  • To highlight challenges and limitations in promoting axon regeneration.

Main Methods:

  • Literature review of studies on axon regeneration.
  • Analysis of regenerative capacities in different neuronal systems.
  • Examination of barriers to regeneration in the central nervous system.

Main Results:

  • Several strategies have been developed to promote axon regeneration.
  • Significant limitations persist, especially in the adult mammalian central nervous system.
  • A comprehensive understanding of regenerative mechanisms is still incomplete.

Conclusions:

  • Continued research is essential for overcoming barriers to axon regeneration.
  • Developing effective strategies for functional restoration remains a key goal.
  • This review provides a historical and current perspective on axon regeneration endeavors.