Global microRNA profiles in cervical squamous cell carcinoma depend on Drosha expression levels - PubMed (original) (raw)
. 2007 Aug;212(4):368-77.
doi: 10.1002/path.2179.
L D Goldstein, G Ng, D M Winder, R D Palmer, E L Gooding, N L Barbosa-Morais, G Mukherjee, N P Thorne, I Roberts, M R Pett, N Coleman
Affiliations
- PMID: 17471471
- DOI: 10.1002/path.2179
Global microRNA profiles in cervical squamous cell carcinoma depend on Drosha expression levels
B Muralidhar et al. J Pathol. 2007 Aug.
Abstract
Gain of chromosome 5p is seen in over 50% of advanced cervical squamous cell carcinomas (SCCs), although the genes responsible for the selective advantage provided by this abnormality are poorly understood. In the W12 cervical carcinogenesis model, we observed that 5p gain was rapidly selected over approximately 15 population doublings and was associated with the acquisition of a growth advantage and invasiveness. The most significantly upregulated transcript following 5p gain was the microRNA (miRNA) processor Drosha. In clinically progressed cervical SCC, Drosha copy-number gain was seen in 21/36 clinical samples and 8/10 cell lines and there was a significant association between Drosha transcript levels and copy-number gain. Other genes in the miRNA processing pathway, DGCR8, XPO5 and Dicer, showed infrequent copy-number gain and over-expression. Drosha copy-number and expression were not elevated in pre-malignant cervical squamous intraepithelial lesions. Importantly, global miRNA profiling showed that Drosha over-expression in cervical SCC appears to be of functional significance. Unsupervised principal component analysis of a mixed panel of cervical SCC cell lines and clinical specimens showed clear separation according to Drosha over-expression. miRNAs most significantly associated with Drosha over-expression are implicated in carcinogenesis in other tissues, suggesting that they regulate fundamental processes in neoplastic progression. Our evidence suggests that copy-number driven over-expression of Drosha and consequent changes in miRNAs are likely to be important contributors to the selective advantage provided by 5p gain in cervical neoplastic progression.
Copyright (c) 2007 Pathological Society of Great Britain and Ireland. Published by John Wiley & Sons, Ltd.
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