Zhao Y, Li Y, Wang L, Yang H, Wang Q, Qi H, Li S, Zhou P, Liang P, Wang Q, Li X. microRNA response elements-regulated TRAIL expression shows specific survival-suppressing activity on bladder cancer.
JOURNAL OF EXPERIMENTAL & CLINICAL CANCER RESEARCH : CR 2013;
32:10. [PMID:
23442927 PMCID:
PMC3764979 DOI:
10.1186/1756-9966-32-10]
[Citation(s) in RCA: 17] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Subscribe] [Scholar Register] [Received: 10/26/2012] [Accepted: 02/20/2013] [Indexed: 12/21/2022]
Abstract
Background
Bladder transitional cell carcinoma greatly threatens human health all over
the world. Tumor necrosis factor-related apoptosis-inducing ligand (TRAIL)
shows a strong apoptosis-inducing effect on a variety of cancer cells
including bladder cancer. However, adenovirus-mediated TRAIL expression
still showed cytotoxicity to normal cells mainly due to lack of tumor
specificity.
Methods
To solve the problem, we applied miRNA response elements (MREs) of
miR-1, miR-133 and
miR-218 to confer TRAIL expression with specificity to
bladder cancer cells.
Results
Expression of miR-1, miR-133 and
miR-218 was greatly decreased in bladder cancer than
normal bladder tissue. Luciferase assay showed that application of the 3
MREs was able to restrain exogenous gene expression to within bladder cancer
cells. Subsequently, we constructed a recombinant adenovirus with TRAIL
expression regulated by MREs of miR-1,
miR-133 and miR-218, namely
Ad-TRAIL-MRE-1-133-218. qPCR, immunoblotting and ELISA assays demonstrated
that Ad-TRAIL-MRE-1-133-218 expressed in bladder cancer cells, rather than
normal bladder cells. The differential TRAIL expression also led to
selective apoptosis-inducing and growth-inhibiting effect of
Ad-TRAIL-MRE-1-133-218 on bladder cancers. Finally, bladder cancer xenograft
in mouse models further confirmed that Ad-TRAIL-MRE-1-133-218 effectively
suppressed the growth of bladder cancers.
Conclusions
Collectively, we demonstrated that MREs-based TRAIL delivery into bladder
cancer cells was feasible and efficient for cancer gene therapy.
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