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Molecular Cancer
Published in: Molecular Cancer 1/2011

Open Access 01-12-2011 | Research

Long noncoding intronic RNAs are differentially expressed in primary and metastatic pancreatic cancer

Authors: Ana C Tahira, Márcia S Kubrusly, Michele F Faria, Bianca Dazzani, Rogério S Fonseca, Vinicius Maracaja-Coutinho, Sergio Verjovski-Almeida, Marcel CC Machado, Eduardo M Reis

Published in: Molecular Cancer | Issue 1/2011

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Abstract

Background

Pancreatic ductal adenocarcinoma (PDAC) is known by its aggressiveness and lack of effective therapeutic options. Thus, improvement in current knowledge of molecular changes associated with pancreatic cancer is urgently needed to explore novel venues of diagnostics and treatment of this dismal disease. While there is mounting evidence that long noncoding RNAs (lncRNAs) transcribed from intronic and intergenic regions of the human genome may play different roles in the regulation of gene expression in normal and cancer cells, their expression pattern and biological relevance in pancreatic cancer is currently unknown. In the present work we investigated the relative abundance of a collection of lncRNAs in patients' pancreatic tissue samples aiming at identifying gene expression profiles correlated to pancreatic cancer and metastasis.

Methods

Custom 3,355-element spotted cDNA microarray interrogating protein-coding genes and putative lncRNA were used to obtain expression profiles from 38 clinical samples of tumor and non-tumor pancreatic tissues. Bioinformatics analyses were performed to characterize structure and conservation of lncRNAs expressed in pancreatic tissues, as well as to identify expression signatures correlated to tissue histology. Strand-specific reverse transcription followed by PCR and qRT-PCR were employed to determine strandedness of lncRNAs and to validate microarray results, respectively.

Results

We show that subsets of intronic/intergenic lncRNAs are expressed across tumor and non-tumor pancreatic tissue samples. Enrichment of promoter-associated chromatin marks and over-representation of conserved DNA elements and stable secondary structure predictions suggest that these transcripts are generated from independent transcriptional units and that at least a fraction is under evolutionary selection, and thus potentially functional.
Statistically significant expression signatures comprising protein-coding mRNAs and lncRNAs that correlate to PDAC or to pancreatic cancer metastasis were identified. Interestingly, loci harboring intronic lncRNAs differentially expressed in PDAC metastases were enriched in genes associated to the MAPK pathway. Orientation-specific RT-PCR documented that intronic transcripts are expressed in sense, antisense or both orientations relative to protein-coding mRNAs. Differential expression of a subset of intronic lncRNAs (PPP3CB, MAP3K14 and DAPK1 loci) in metastatic samples was confirmed by Real-Time PCR.

Conclusion

Our findings reveal sets of intronic lncRNAs expressed in pancreatic tissues whose abundance is correlated to PDAC or metastasis, thus pointing to the potential relevance of this class of transcripts in biological processes related to malignant transformation and metastasis in pancreatic cancer.
Appendix
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Metadata
Title
Long noncoding intronic RNAs are differentially expressed in primary and metastatic pancreatic cancer
Authors
Ana C Tahira
Márcia S Kubrusly
Michele F Faria
Bianca Dazzani
Rogério S Fonseca
Vinicius Maracaja-Coutinho
Sergio Verjovski-Almeida
Marcel CC Machado
Eduardo M Reis
Publication date
01-12-2011
Publisher
BioMed Central
Published in
Molecular Cancer / Issue 1/2011
Electronic ISSN: 1476-4598
DOI
https://doi.org/10.1186/1476-4598-10-141

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