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EVI1 splice variants modulate functional responses in ovarian cancer cells.

Abstract：

:Amplification of 3q26.2, found in many cancer lineages, is a frequent and early event in ovarian cancer. We previously defined the most frequent region of copy number increase at 3q26.2 to EVI1 (ecotropic viral integration site-1) and MDS1 (myelodysplastic syndrome 1) (aka MECOM), an observation recently confirmed by the cancer genome atlas (TCGA). MECOM is increased at the DNA, RNA, and protein level and likely contributes to patient outcome. Herein, we report that EVI1 is aberrantly spliced, generating multiple variants including a Del(190-515) variant (equivalent to previously reported) expressed in >90% of advanced stage serous epithelial ovarian cancers. Although EVI1(Del190-515) lacks ∼70% of exon 7, it binds CtBP1 as well as SMAD3, important mediators of TGFβ signaling, similar to wild type EVI1. This contrasts with EVI1 1-268 which failed to interact with CtBP1. Interestingly, the EVI1(Del190-515) splice variant preferentially localizes to PML nuclear bodies compared to wild type and EVI1(Del427-515). While wild type EVI1 efficiently repressed TGFβ-mediated AP-1 (activator protein-1) and plasminogen activator inhibitor-1 (PAI-1) promoters, EVI1(Del190-515) elicited a slight increase in both promoter activities. Expression of EVI1 and EVI1(Del427-515) (but not EVI1(Del190-515)) in OVCAR8 ovarian cancer cells increased cyclin E1 LMW expression and cell cycle progression. Furthermore, knockdown of specific EVI1 splice variants (both MDS1/EVI1 and EVI1(Del190-515)) markedly increased claudin-1 mRNA and protein expression in HEY ovarian and MDA-MB-231 breast cancer cells. Changes in claudin-1 were associated with alterations in specific epithelial-mesenchymal transition markers concurrent with reduced migratory potential. Collectively, EVI1 is frequently aberrantly spliced in ovarian cancer with specific forms eliciting altered functions which could potentially contribute to ovarian cancer pathophysiology.

journal_name

Mol Oncol

journal_title

Molecular oncology

authors

Dutta P,Bui T,Bauckman KA,Keyomarsi K,Mills GB,Nanjundan M

doi

10.1016/j.molonc.2013.02.008

subject

Has Abstract

pub_date

2013-06-01 00:00:00

pages

647-68

issue

3

eissn

1574-7891

issn

1878-0261

pii

S1574-7891(13)00032-X

journal_volume

7

pub_type

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