Mast cell density and IL-8 expression in nonlesional and lesional psoriatic skin

Wen Yue Jiang, Arka D. Chattedee, Siba P Raychaudhuri, Smriti K. Raychaudhuri, Eugene M. Farber

Research output: Contribution to journalArticlepeer-review

68 Scopus citations


Background: An important cellular aberration at sites of psoriatic inflammation is an increase in the number of dermal mast cells. Being multifactorial immune effector cells, it is believed that mast cells play an essential role in perpetuating the inflammatory process of psoriasis. However, factors responsible for the infiltration and accumulation of mast cells in psoriatic lesions are largely unknown. Recent studies have demonstrated that Interleukin-8 (IL-8) exerts strong chemotactic effects on mast cells in vitro. Overexpression of IL-8 has also been reported in psoriatic lesions. In this study, we have found a correlation between the expression of IL-8 and dermal mast cell density in lesional psoriatic skin as compared to nonlesional psoriatic skin. Methods: Four-mm punch biopsies were taken from 14 psoriatic patients and eight healthy volunteers. Using immunohistochemical techniques, 8 μm sections of lesional psoriatic. nonlesional psoriatic, and normal control samples were evaluated for dermal mast cell density and the density of IL-8 expressing keratinocytes. Results: It was found that dermal mast cell density in lesional psoriatic, nonlesional psoriatic, and normal skin was 105.4 ± 71.2, 42.3 ± 30.1, and 47.5 ± 32.5 mast cells/mm2, respectively. IL-8+ keratinocyte density in lesional psoriatic, non lesional psoriatic, and normal skin was 171.5 ± 67.1, 25.4 ± 14.9 and 20.6 ± 8.7 IL-8+ Keratinocytes/mm2, respectively. Conclusions: The results of this study suggest that increased levels of IL-8 in the keratinocytes or psoriatic plaques play a contributing role in the migration of mast cells to lesions sites.

Original languageEnglish (US)
Pages (from-to)699-703
Number of pages5
JournalInternational Journal of Dermatology
Issue number11
StatePublished - 2001
Externally publishedYes

ASJC Scopus subject areas

  • Dermatology


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