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The contribution of stem cells to epidermal and hair follicle tumours in the dog.
MedLine Citation:
PMID:  23331697     Owner:  NLM     Status:  In-Data-Review    
Background -  Although cutaneous stem cells have been implicated in skin tumourigenesis in humans, no studies have been conducted to elucidate the presence and the possible role of stem cells in hair follicle tumours in the dog. Hypothesis -  Stem cell markers are expressed in canine epidermal and follicular tumours and can be used to better understand the biology and origin of these tumours. Animals and Methods -  In the present study, normal skin sections and 44 follicular tumours were retrospectively investigated for the immunohistochemical expression of keratin 15 (K15) and nestin. In addition, 30 squamous cell carcinomas were evaluated for K15 expression. Results -  In normal skin, K15 and nestin were expressed in the outer root sheath cells of the isthmic portion of the hair follicle (bulge region), and K15 expression was also scattered in the basal cell layer of the epidermis. Infundibular keratinizing acanthomas, pilomatricomas and squamous cell carcinomas were mostly negative for K15, trichoblastomas were moderately to strongly positive, tricholemmomas were either negative or strongly positive, and trichoepitheliomas had heterogeneous staining. Nestin expression was generally faint in all follicular tumours. Conclusions and clinical importance -  Our results show that K15 can be a reliable marker for investigating the role of stem cells in hair follicle tumours of the dog, while nestin was judged to be a nonoptimal marker. Furthermore, our study suggests that hair follicle stem cells are present in the bulge region of hair follicles and could possibly play a role in tumourigenesis of canine tumours originating from this portion of the follicle, namely trichoblastomas, tricholemmomas and trichoepitheliomas. The loss of K15 expression in squamous cell carcinomas compared with normal skin suggests that this event could be important in the malignant transformation.
Chiara Brachelente; Ilaria Porcellato; Monica Sforna; Elvio Lepri; Luca Mechelli; Laura Bongiovanni
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Publication Detail:
Type:  Journal Article    
Journal Detail:
Title:  Veterinary dermatology     Volume:  24     ISSN:  1365-3164     ISO Abbreviation:  Vet. Dermatol.     Publication Date:  2013 Feb 
Date Detail:
Created Date:  2013-01-21     Completed Date:  -     Revised Date:  -    
Medline Journal Info:
Nlm Unique ID:  9426187     Medline TA:  Vet Dermatol     Country:  England    
Other Details:
Languages:  eng     Pagination:  188-e41     Citation Subset:  IM    
Copyright Information:
© 2013 The Authors. Veterinary Dermatology © 2013 ESVD and ACVD.
Department of Biopathological Sciences and Hygiene of Animal and Alimentary Productions, Faculty of Veterinary Medicine, University of Perugia, Perugia, Italy Department of Comparative Biomedical Sciences, Faculty of Veterinary Medicine, University of Teramo, Teramo, Italy.
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