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Renewal of Skin Epidermal Stem Cells01:12

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The skin is divided into epidermis, dermis, and hypodermis, the skin's outermost, middle, and inner layers. The human epidermal layer regularly undergoes renewal, where old, dead cells are replaced by new cells. Epidermal stem cells or EpiSCs divide and differentiate to restore the lost cells. For the renewal process, some EpiSCs continuously self-renew. In contrast, few others differentiate into transit-amplifying cells, which later form prickle or spinous cells, followed by granular...
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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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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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Skin Cancer01:30

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Skin cancer is a type of cancer that occurs when there is an abnormal growth of skin cells, usually triggered by damage to the DNA within the skin cells. It is primarily caused by exposure to ultraviolet (UV) radiation from the sun or artificial sources like tanning beds. Skin cancer is the most common type of cancer worldwide, and its incidence continues to rise.
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Unrenewable Cells00:50

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Rapid Genetic Analysis of Epithelial-Mesenchymal Signaling During Hair Regeneration
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The regenerating naevus.

Ricardo E Vilain1, Stanley W McCarthy2, Richard A Scolyer2

  • 1School of Biomedical Sciences and Pharmacy, Faculty of Health, University of Newcastle, Callaghan, Australia; Hunter Cancer Research Alliance (HCRA), Calvary Mater Newcastle, Waratah, Australia; Division of Anatomical Pathology, Pathology North (Hunter), New Lambton Heights, Australia.

Pathology
|March 30, 2016
PubMed
Summary
This summary is machine-generated.

Regenerating naevus, a post-surgical skin lesion, can mimic melanoma. Careful clinical and histological assessment is crucial to avoid misdiagnosis of this benign condition.

Keywords:
Diagnosismelanomapathologypersistent naevuspseudomelanomarecurrent naevusregenerating naevus

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Area of Science:

  • Dermatopathology
  • Oncology

Background:

  • Recurrence of melanocytic lesions after excision poses diagnostic challenges.
  • Regenerating naevi can histologically resemble melanoma, leading to potential misdiagnosis.

Purpose of the Study:

  • To highlight the diagnostic difficulties in distinguishing regenerating naevi from melanoma.
  • To emphasize the importance of clinical context and precursor lesion assessment.

Main Methods:

  • Review of clinical features and histological patterns of regenerating naevi.
  • Correlation of histological findings with clinical history of prior surgery or trauma.

Main Results:

  • Regenerating naevi exhibit specific clinical and histological clues aiding diagnosis.
  • Absence of surgical history necessitates provisional diagnosis, requiring precursor lesion confirmation.

Conclusions:

  • Accurate diagnosis of regenerating naevi relies on integrating clinical information with pathological findings.
  • Over-diagnosis of melanoma can be avoided by recognizing the benign nature of regenerating naevi through careful evaluation.