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Related Experiment Videos

Morphological and immunochemical differences between keloid and hypertrophic scar

H P Ehrlich1, A Desmoulière, R F Diegelmann

  • 1Department of Surgery, Milton S. Hershey Medical Center, Hershey, Pennsylvania.

The American Journal of Pathology
|July 1, 1994
PubMed
Summary

Keloids and hypertrophic scars, distinct excessive scarring types, show key differences in collagen structure and myofibroblast presence. These distinctions are crucial for accurate diagnosis and targeted therapeutic approaches.

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Area of Science:

  • Dermatology
  • Pathology
  • Cell Biology

Background:

  • Keloids and hypertrophic scars are distinct forms of excessive scarring with differing clinical behaviors and therapeutic needs.
  • Despite apparent morphological similarities, distinguishing between keloid and hypertrophic scars is challenging but essential for appropriate patient management.
  • Understanding the underlying biological differences is key to developing effective treatments for these scar types.

Purpose of the Study:

  • To investigate and delineate the distinct collagen organization and myofibroblast presence in keloids versus hypertrophic scars.
  • To identify reliable morphological and immunohistochemical markers for differentiating between keloid and hypertrophic scars.
  • To explore the role of alpha-smooth muscle (SM) actin-expressing myofibroblasts in scar contracture and their expression patterns in vivo and in vitro.

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Main Methods:

  • Comparative analysis of collagen fiber organization using electron microscopy.
  • Immunohistochemical staining for alpha-smooth muscle (SM) actin to identify myofibroblasts.
  • In vitro cell culture of fibroblasts from both scar types to assess protein expression.

Main Results:

  • Keloids exhibit large, thick collagen fibers, while hypertrophic scars show modular structures with fibroblastic cells and fine collagen.
  • Nodular structures, characteristic of hypertrophic scars, contain alpha-SM actin-expressing myofibroblasts; these are rare in keloids.
  • In vitro, fibroblasts from both scar types express similar amounts of alpha-SM actin, suggesting microenvironmental regulation of in vivo expression.

Conclusions:

  • Significant morphological and immunohistochemical differences exist between keloids and hypertrophic scars, aiding their biological and pathological characterization.
  • The presence of alpha-SM actin-expressing myofibroblasts in hypertrophic scar nodules may contribute to scar contracture.
  • Local microenvironmental factors appear to influence the in vivo expression of alpha-SM actin in scar fibroblasts.