Home Bratislava Medical Journal 2014 Bratislava Medical Journal Vol.115, No.11, p.685-691, 2014

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Published Monthly, in English
Founded: 1919
ISSN 0006-9248
(E)ISSN 1336-0345

Impact factor 1.564


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Bratislava Medical Journal Vol.115, No.11, p.685-691, 2014

Title: The inhibition effect of expressions of miR-221 and miR-222 on glioma and corresponding mechanism
Author: Z. Zhang, B. Z. Cui, L. H. Wu, Q. L. Xu, Z. Wang, B. Yang


Purpose: This study was designed to investigate the expressions of genes miR-221 and miR-222 in glioma cells and elucidate the mechanism of the inhibition of expressions of miR-221 and miR-222 in glioma.
Methods: After being cultured, in vitro cells of U251 malignant glioma were divided into five groups, namely, blank control group, nonsense sequence ODN transfection group, AS-miR-221-ODN transfection group, AS-miR-222-ODN transfection group, AS-miR-221 ODN and AS-miR-222 0DN co-transfection group.
Results: The growth of the cells in AS-miR-221/222 group was significantly inhibited after transfection of 24 hours. Moreover, this inhibition degree became more apparent with prolonged time. The cell percentage in AS-miR-221/222 transfection group was 57.2 % in G0/G1 phase, 35.1 % in S phase, and 38.2 % in G2/M phase. The cell percentage in S phase was decreased. Cell cycle arrest was found in G0/G1 phase.

Animal experiments showed that the glioma volume of AS-miR-221/222 treatment group was significantly different to that of the control group (p < 0.05).

Furthermore, this difference gradually increased with time. It reached the maximum at the end of the observation period. In the U251 glioma specimens in AS-miR-221/222 treatment group, local glioma tissue developed necrosis foci. In addition, the nuclear size, color, heteromorphism, and new vessel number of these glioma tissues were decreased.
Conclusion: There are a series of abnormal miRNA expressions in glioma. Among them, miR-221 and miR -222 are clustered miR s with elevated expressions. The over-expressions of miR-221 and miR-222 can be considered as new molecular tags for human glioma (Tab. 5, Fig. 4, Ref. 30).

Keywords: miR-221, miR-222, glioma, inhibition, target gene.
Year: 2014, Volume: 115, Issue: 11 Page From: 685, Page To: 691

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