Dermatology Online Journal
What is the mechanism of Koebner phenomenon in Henoch-Schönlein purpua?
- Author(s): Shin, Jae Il
- Lee, Jae Seung
- et al.
What is the mechanism of Koebner phenomenon in Henoch-Schönlein purpua?Department of Pediatrics, The Institute of Kidney Disease, Yonsei University College of Medicine, Severance Children's Hospital,
Seoul, Korea. firstname.lastname@example.org
Jae Il Shin MD, Jae Seung Lee MD
Dermatology Online Journal 14 (9): 15
Comment on: Koebner phenomenon in Henoch Schoenlein purpura and role of pressure in its causation (Dermatol Online J. 2007 May 1;13(2):26.)
We read with interest the article by van Nischal et al.  They reported a 42-year-old male with Henoch-Schönlein purpura (HSP) showing Koebner's phenomenon , but the exact patho-mechanism was not elucidated. Namazi  reported that increase of tryptase levels following trauma could also provide a mechanism for Koebner phenomenon seen in psoriasis and Naukkarinen et al.  also showed that mast cell tryptase and chymase are potential regulators of neurogenic inflammation in psoriatic skin. Therefore, tryptase may play an important role in the pathogenesis of Koebner phenomenon. Although not extensively studied in vasculitis, recent studies showed that immuno-enzyme-histological staining of tryptase (a marker for mast cell activation) was found in cutaneous allergic vasculitis  or HSP nephritis . Therefore, further studies should be performed to elucidate the relationship between mast cell activation and Koebner phenomenon in the acute stage of HSP.
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2. Namazi MR. Possible molecular mechanisms to account for the involvement of tryptase in the pathogenesis of psoriasis. Autoimmunity. 2005 Sep;38(6):449-52. PubMed
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