Activation of Src-family tyrosine kinases in hyperproliferative epidermal disorders

Elias E. Ayli, Weijie Li, Tamu T. Brown, Agnieszka Witkiewicz, Rosalie Elenitsas, John T. Seykora

Research output: Contribution to journalArticlepeer-review

41 Scopus citations


Background: Src-family tyrosine kinases (SFKs) are important regulators of keratinocyte growth and differentiation. In a broad range of cell types, persistent activation of SFKs correlates with increased cell proliferation. In this study, we determined if SFK activity is increased in cutaneous neoplasia and psoriasis, common hyperproliferative epidermal disorders. Methods: Formalin-fixed tissue sections of unremarkable epidermis, psoriasis, actinic keratoses (AKs), squamous cell carcinoma in situ (SCIS) and squamous cell carcinoma (SCC) were subjected to immunohistochemical staining for activated SFKs. Results: All psoriasis specimens displayed significantly greater staining for activated SFKs than sections of unremarkable skin. In the psoriasis biopsies, the degree of epidermal hyperplasia was proportional to the level of activated SFK staining. All AKs, SCISs and SCCs exhibited more prominent staining than sections of unremarkable epidermis. No discernable difference in activated SFK staining was seen between AKs, SCIS and SCC specimens. Conclusions: This study shows increased staining of activated SFKs in human biopsy specimens of psoriasis and cutaneous neoplasia. These data provide direct evidence for increased activation of SFKs in the pathogenesis of hyperproliferative epidermal disorders.

Original languageEnglish (US)
Pages (from-to)273-277
Number of pages5
JournalJournal of Cutaneous Pathology
Issue number3
StatePublished - Mar 2008

ASJC Scopus subject areas

  • Pathology and Forensic Medicine
  • Histology
  • Dermatology


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