Document Detail


Expression of the CDK inhibitor p27kip1 and oxidative DNA damage in non-neoplastic and neoplastic vulvar epithelial lesions.
MedLine Citation:
PMID:  16474380     Owner:  NLM     Status:  MEDLINE    
Abstract/OtherAbstract:
Vulvar cancer represents an important medical problem worldwide whose incidence is increasing at an alarming rate in young females. Several factors have been linked to vulvar cancer development, but its exact pathogenesis remains to be determined. Vulvar tumorigenesis proceeds through intermediate dysplastic lesions, known as vulvar intraepithelial neoplasias, frequently associated with non-neoplastic epithelial disorders of the vulva, such as lichen sclerosus and squamous cell hyperplasia. In this study, the expression of the CDK inhibitor p27Kip1 and the extent of endogenous oxidative DNA damage were evaluated in vulvar specimens, including normal tissues, lichen sclerosus, squamous cell hyperplasia, vulvar intraepithelial neoplasias and invasive squamous cell carcinomas. We found that p27Kip1 was constantly expressed in normal vulvar epithelium cells while a progressive significant reduction in the percentage of p27Kip1-positive cells was observed in vulvar intraepithelial neoplasias (77%) and in invasive carcinomas (64%). Mean percentage of positive cells in invasive carcinomas, but not in vulvar intraepithelial neoplasias, was also significantly lower than squamous cell hyperplasia lesions (78%) while lichen sclerosus displayed a percentage of positive cells (45%) significantly lower than both vulvar intraepithelial neoplasias and invasive carcinomas. 8-hydroxydeoxyguanosine (8-OHdG) is considered a sensitive biomarker for oxidative stress. We observed a progressive significant increase in the levels of 8-OHdG and in the percentage of positive cells from normal vulvar epithelium to vulvar intraepithelial neoplasias (25%) and to invasive carcinomas (64%). Squamous cell hyperplasia displayed an intermediate percentage of positive cells comparable to vulvar intraepithelial neoplasias 2 but significantly higher than vulvar intraepithelial neoplasias 1 and lower than invasive carcinomas. Lichen sclerosus staining was significantly lower than carcinomas but higher than vulvar intraepithelial neoplasias and squamous cell hyperplasia. These results demonstrate that expression of p27Kip1 is downregulated while oxidative DNA damage increases from early non-neoplastic epithelial alterations through vulvar intraepithelial neoplasias to invasive vulvar carcinomas. Thus, both parameters might play an important role in the development of this cancer and their study might contribute to our understanding of human vulvar carcinogenesis.
Authors:
Gian F Zannoni; Beatrice Faraglia; Elisabetta Tarquini; Andrea Camerini; Karen Vrijens; Mario Migaldi; Achille Cittadini; Alessandro Sgambato
Publication Detail:
Type:  Journal Article; Research Support, Non-U.S. Gov't    
Journal Detail:
Title:  Modern pathology : an official journal of the United States and Canadian Academy of Pathology, Inc     Volume:  19     ISSN:  0893-3952     ISO Abbreviation:  Mod. Pathol.     Publication Date:  2006 Apr 
Date Detail:
Created Date:  2006-03-23     Completed Date:  2006-07-10     Revised Date:  2006-11-15    
Medline Journal Info:
Nlm Unique ID:  8806605     Medline TA:  Mod Pathol     Country:  United States    
Other Details:
Languages:  eng     Pagination:  504-13     Citation Subset:  IM    
Affiliation:
Istituto di Anatomia Patologica, Università Cattolica del Sacro Cuore, Rome, Italy.
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MeSH Terms
Descriptor/Qualifier:
Aged
Aged, 80 and over
Carcinoma, Squamous Cell / metabolism,  pathology
Cell Line, Tumor
Cyclin-Dependent Kinase Inhibitor p27 / biosynthesis*
DNA Damage*
Deoxyguanosine / analogs & derivatives,  analysis
Female
Humans
Hyperplasia
Immunohistochemistry
Lichen Sclerosus et Atrophicus / metabolism,  pathology
Middle Aged
Oxidative Stress
Vulva / chemistry,  pathology*
Vulvar Neoplasms / metabolism,  pathology*
Chemical
Reg. No./Substance:
0/8-hydroxy-2'-deoxyguanosine; 147604-94-2/Cyclin-Dependent Kinase Inhibitor p27; 961-07-9/Deoxyguanosine

From MEDLINE®/PubMed®, a database of the U.S. National Library of Medicine


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