Differential expression of miRNAs in pancreatobiliary type of periampullary adenocarcinoma and its associated stroma.

Abstract:

:Periampullary adenocarcinomas can be of two histological subtypes, intestinal or pancreatobiliary. The latter is more frequent and aggressive, and characterized by a prominent desmoplastic stroma, which is tightly related to the biology of the cancer, including its poor response to chemotherapy. Whereas miRNAs are known to regulate various cellular processes and interactions between cells, their exact role in periampullary carcinoma remains to be characterized, especially with respect to the prominent stromal component of pancreatobiliary type cancers. The present study aimed at elucidating this role by miRNA expression profiling of the carcinomatous and stromal component in twenty periampullary adenocarcinomas of pancreatobiliary type. miRNA expression profiles were compared between carcinoma cells, stromal cells and normal tissue samples. A total of 43 miRNAs were found to be differentially expressed between carcinoma and stroma of which 11 belong to three miRNA families (miR-17, miR-15 and miR-515). The levels of expression of miRNAs miR-17, miR-20a, miR-20b, miR-223, miR-10b, miR-2964a and miR-342 were observed to be higher and miR-519e to be lower in the stromal component compared to the carcinomatous and normal components. They follow a trend where expression in stroma is highest followed by carcinoma and then normal tissue. Pathway analysis revealed that pathways regulating tumor-stroma interactions such as ECM interaction remodeling, epithelial-mesenchymal transition, focal adhesion pathway, TGF-beta, MAPK signaling, axon guidance and endocytosis were differently regulated. The miRNA-mRNA mediated interactions between carcinoma and stromal cells add new knowledge regarding tumor-stroma interactions.

journal_name

Mol Oncol

journal_title

Molecular oncology

authors

Sandhu V,Bowitz Lothe IM,Labori KJ,Skrede ML,Hamfjord J,Dalsgaard AM,Buanes T,Dube G,Kale MM,Sawant S,Kulkarni-Kale U,Børresen-Dale AL,Lingjærde OC,Kure EH

doi

10.1016/j.molonc.2015.10.011

subject

Has Abstract

pub_date

2016-02-01 00:00:00

pages

303-16

issue

2

eissn

1574-7891

issn

1878-0261

pii

S1574-7891(15)00189-1

journal_volume

10

pub_type

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