CD44 and hyaluronan expression in human cutaneous scar fibroblasts

D. V. Messadi, Charles Bertolami

Research output: Contribution to journalArticle

Abstract

Fibrotic disorders of skin and other organs are typically associated with an abnormal accumulation of extracellular matrix. This study focuses on a matrix constituent, hyaluronan - which is known to be altered in fibrotic disorders of skin - and on CD44, a cell adhesion molecule and putative receptor for hyaluronan. Tissue samples were obtained from biopsies of human normal skin, normal cutaneous scar, and hypertrophic cutaneous scar. After culturing, cells were studied by single- and double-labeling immunohistochemistry using the two anti-CD44 monoclonal antibodies, BU-52 and J173, and a biotinylated hyaluronan binding complex probe, b-HABR. Certain cultures were pretreated with Streptomyces hyaluronidase to assess the dependency of CD44 expression on the presence of endogenous hyaluronan. CD44 expression, both in the presence and the absence of exogenous hyaluronan, was quantitated by radioimmunobinding assay. Overall glycosaminoglycan synthesis and identification of hyaluronan were accomplished by precursor incorporation assays and by quantitative cellulose acetate electrophoresis. CD44 was found to be a normal human adult fibroblastic antigen whose expression is markedly increased for hypertrophic scar fibroblasts compared with normal skin fibroblasts. Although hyaluronan was found to be the predominant glycosaminoglycan constituent of the pericellular matrix for these fibroblasts, CD44 attachment to the cell surface is neither mediated by hyaluronan nor is the presence of hyaluronan a prerequisite for CD44 expression. Exogenous hyaluronan induced a decline in measurable CD44 expression for normal skin fibroblasts but not for hypertrophic scar fibroblasts. These observations are compatible with current understanding of the way cells manage the hyaluronan economy of the extracellular matrix and emphasize phenotypic heterogeneities between fibroblasts derived from normal versus scar tissues.

Original languageEnglish (US)
Pages (from-to)1041-1049
Number of pages9
JournalAmerican Journal of Pathology
Volume142
Issue number4
StatePublished - 1993

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Hyaluronic Acid
Cicatrix
Fibroblasts
Skin
Hypertrophic Cicatrix
Glycosaminoglycans
Extracellular Matrix
CD44 Antigens
Cellulose Acetate Electrophoresis
Hyaluronoglucosaminidase
Cell Adhesion Molecules
Streptomyces
Immunohistochemistry
Monoclonal Antibodies
Biopsy
Antigens

ASJC Scopus subject areas

  • Pathology and Forensic Medicine

Cite this

CD44 and hyaluronan expression in human cutaneous scar fibroblasts. / Messadi, D. V.; Bertolami, Charles.

In: American Journal of Pathology, Vol. 142, No. 4, 1993, p. 1041-1049.

Research output: Contribution to journalArticle

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