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Table of Contents
Vol. 201, No. 1, 2000
Issue release date: 2000
Section title: Clinical and Laboratory Investigations
Dermatology 2000;201:15–20
(DOI:10.1159/000018422)

Changes in Keratin 6 and Keratin 10 (Co-)Expression in Lesional and Symptomless Skin of Spreading Psoriasis

Mommers J.M. · van Rossum M.M. · van Erp P.E.J. · van de Kerkhof P.C.M.
Department of Dermatology, University Medical Centre Nijmegen, The Netherlands

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Article / Publication Details

First-Page Preview
Abstract of Clinical and Laboratory Investigations

Published online: 8/26/2000

Number of Print Pages: 6
Number of Figures: 4
Number of Tables: 0

ISSN: 1018-8665 (Print)
eISSN: 1421-9832 (Online)

For additional information: http://www.karger.com/DRM

Abstract

Background: Keratin 6 (K6) and keratin 10 (K10) are markers for epidermal hyperproliferation and differentiation, respectively, and are both expressed in the suprabasal layers of the epidermis. They may be co-expressed in different stages of the spreading psoriatic lesion, but single expression can also occur. Objective: To investigate to what extent keratinocytes express K6 and K10, and to what extent they co-express K6 and K10 in different stages of the psoriatic lesion. We studied this in spreading psoriatic plaques. Methods: Three 3-mm punch biopsies were obtained from the inner involved margin of a spreading lesion, from the uninvolved skin immediately adjacent to the spreading plaque, and from the distant uninvolved skin of 8 patients with incipient psoriasis. From 9 healthy volunteers, 3-mm punch biopsies were obtained as controls. After preparation of single cell suspensions of these biopsies, a triple staining protocol was performed with markers for K6 (monoclonal antibody LHK6B), K10 (monoclonal antibody RKSE60) and DNA content (TO-PRO-3 iodide). Subsequently, cells were measured with a flow cytometer and the proportion of the markers was calculated using specific software. Results: We observed a population of K6/K10-co-expressing cells, but also populations expressing only K6. These subpopulations varied with the involvement of the lesion. There was a statistically significant difference between the inner margin and the outer margin with respect to the proportion of K6- and K10-expressing cells, whereas more K6-positive and K10-negative cells were detected in the inner margin of the lesions. The proportion of K6/K10-co-expressing cells in the inner margin was significantly different from the distant uninvolved skin. Conclusion: We confirmed that individual keratinocytes in psoriasis can express K6 or K10 depending on their localization in involved or uninvolved skin. There is a unique subpopulation of cells in the psoriatic plaques which co-express K6 and K10. More studies are required to fully understand the pathogenic relevance of co-expression and single expression of K6 and K10.


Article / Publication Details

First-Page Preview
Abstract of Clinical and Laboratory Investigations

Published online: 8/26/2000

Number of Print Pages: 6
Number of Figures: 4
Number of Tables: 0

ISSN: 1018-8665 (Print)
eISSN: 1421-9832 (Online)

For additional information: http://www.karger.com/DRM


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Drug Dosage: The authors and the publisher have exerted every effort to ensure that drug selection and dosage set forth in this text are in accord with current recommendations and practice at the time of publication. However, in view of ongoing research, changes in goverment regulations, and the constant flow of information relating to drug therapy and drug reactions, the reader is urged to check the package insert for each drug for any changes in indications and dosage and for added warnings and precautions. This is particularly important when the recommended agent is a new and/or infrequently employed drug.
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