Morphological and immunochemical differences between keloid and hypertrophic scar

H. Paul Ehrlich, Alexis Desmoulière, Robert F. Diegelmann, I. Kelman Cohen, Carolyn C. Compton, Warren L. Garner, Yusuf Kapanci, Giulio Gabbiani

Research output: Contribution to journalArticle

Abstract

There are two types of excessive scarring, keloid and hypertrophic scar. Contrary to hypertrophic scars, keloids do not regress with time, are difficult to revise surgically, and do not provoke scar contractures. These two lesions require different therapeutic approaches but are often confused because of an apparent lack of morphological differences. We have investigated the collagen organization and the possible presence of α- smooth muscle (SM) actin-expressing myofibroblasts in these conditions. Keloids contain large, thick collagen fibers composed of numerous fibrils closely packed together. In contrast hypertrophic scars exhibit nodular structures in which fibroblastic cells, small vessels, and fine, randomly organized collagen fibers are present. We confirm that such nodular structures are always present in hypertrophic scar and rarely in keloid. Furthermore, only nodules of hypertrophic scars contain α-SM actin- expressing myofibroblasts. Electron microscopic examination supports the above-mentioned differences in collagen organization and in fibroblastic features and shows the presence of an amorphous extracellular material surrounding fibroblastic cells in keloid. The presence in hypertrophic scar myofibroblasts of α-SM actin, the actin isoform typical of vascular SM cells, may represent an important element in the pathogenesis of contraction. Interestingly, when placed in culture fibroblasts from hypertrophic scars and keloids express similar amounts of α-SM actin, suggesting that local microenvironmental factors influence in vivo the expression of this protein. Thus several morphological and immunohistochemical differences exist between hypertrophic scar and keloid that are useful for the biological and pathological characterization of the two lesions.

Original languageEnglish (US)
Pages (from-to)105-113
Number of pages9
JournalAmerican Journal of Pathology
Volume145
Issue number1
StatePublished - Jul 1994
Externally publishedYes

Fingerprint

Hypertrophic Cicatrix
Keloid
Actins
Smooth Muscle
Myofibroblasts
Collagen
Cicatrix
Contracture
Vascular Smooth Muscle
Smooth Muscle Myocytes
Protein Isoforms
Fibroblasts
Electrons

ASJC Scopus subject areas

  • Pathology and Forensic Medicine

Cite this

Ehrlich, H. P., Desmoulière, A., Diegelmann, R. F., Cohen, I. K., Compton, C. C., Garner, W. L., ... Gabbiani, G. (1994). Morphological and immunochemical differences between keloid and hypertrophic scar. American Journal of Pathology, 145(1), 105-113.

Morphological and immunochemical differences between keloid and hypertrophic scar. / Ehrlich, H. Paul; Desmoulière, Alexis; Diegelmann, Robert F.; Cohen, I. Kelman; Compton, Carolyn C.; Garner, Warren L.; Kapanci, Yusuf; Gabbiani, Giulio.

In: American Journal of Pathology, Vol. 145, No. 1, 07.1994, p. 105-113.

Research output: Contribution to journalArticle

Ehrlich, HP, Desmoulière, A, Diegelmann, RF, Cohen, IK, Compton, CC, Garner, WL, Kapanci, Y & Gabbiani, G 1994, 'Morphological and immunochemical differences between keloid and hypertrophic scar', American Journal of Pathology, vol. 145, no. 1, pp. 105-113.
Ehrlich HP, Desmoulière A, Diegelmann RF, Cohen IK, Compton CC, Garner WL et al. Morphological and immunochemical differences between keloid and hypertrophic scar. American Journal of Pathology. 1994 Jul;145(1):105-113.
Ehrlich, H. Paul ; Desmoulière, Alexis ; Diegelmann, Robert F. ; Cohen, I. Kelman ; Compton, Carolyn C. ; Garner, Warren L. ; Kapanci, Yusuf ; Gabbiani, Giulio. / Morphological and immunochemical differences between keloid and hypertrophic scar. In: American Journal of Pathology. 1994 ; Vol. 145, No. 1. pp. 105-113.
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