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2015 ; 4
(7
): e246
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Inhibition of Gastric Tumor Cell Growth Using Seed-targeting LNA as Specific,
Long-lasting MicroRNA Inhibitors
#MMPMID26151747
Staedel C
; Varon C
; Nguyen PH
; Vialet B
; Chambonnier L
; Rousseau B
; Soubeyran I
; Evrard S
; Couillaud F
; Darfeuille F
Mol Ther Nucleic Acids
2015[Jul]; 4
(7
): e246
PMID26151747
show ga
MicroRNAs regulate eukaryotic gene expression upon pairing onto target mRNAs.
This targeting is influenced by the complementarity between the microRNA "seed"
sequence at its 5' end and the seed-matching sequences in the mRNA. Here, we
assess the efficiency and specificity of 8-mer locked nucleic acid (LNA)-modified
oligonucleotides raised against the seeds of miR-372 and miR-373, two embryonic
stem cell-specific microRNAs prominently expressed in the human gastric
adenocarcinoma AGS cell line. Provided that the pairing is perfect over all the
eight nucleotides of the seed and starts at nucleotide 2 or 1 at the microRNA 5'
end, these short LNAs inhibit miR-372/373 functions and derepress their common
target, the cell cycle regulator LATS2. They decrease cell proliferation in vitro
upon either transfection at nanomolar concentrations or unassisted delivery at
micromolar concentrations. Subcutaneously delivered LNAs reduce tumor growth of
AGS xenografts in mice, upon formation of a stable, specific heteroduplex with
the targeted miR-372 and -373 and LATS2 upregulation. Their therapeutic potential
is confirmed in fast-growing, miR-372-positive, primary human gastric
adenocarcinoma xenografts in mice. Thus, microRNA silencing by 8-mer
seed-targeting LNAs appears a valuable approach for both loss-of-function studies
aimed at elucidating microRNA functions and for microRNA-based therapeutic
strategies.