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Xiao L.,Red Cross | Wu Z.,Yunnan University | Zhu Q.,Yunnan University | Gao C.,3rd Affiliated Hospital of Kunming Medical College | And 3 more authors.
Chinese-German Journal of Clinical Oncology | Year: 2010

MicroRNAs (miRNAs) belong to a class of noncoding, regulatory RNAs that are involved in oncogenesis and show remarkable tissue specificity. miRNAs are approximately 22 nt non-coding RNAs, which regulate gene expression in a sequence-specific manner via translational inhibition or messenger RNA (mRNA) degradation, thus affecting various cellular processes. Since the discovery of their fundamental mechanisms of action, the field of miRNAs has opened a new era in the understanding of small noncoding RNAs. Recent evidence has shown that miRNA controls cell growth, apoptosis, and differentiation. Cancer is a complex genetic disease caused by abnormalities in gene structure and expression, moreover, miRNA expression correlates with cancers and could have a crucial function in tumor progression. Bioinformatic data indicate that each miRNA can control hundreds of target genes, but identification of the accurate miRNA targets will be crucial to exploit the emerging knowledge of miRNA contribution to cancer process. © 2010 Springer-Verlag Berlin Heidelberg.

Xu L.,Yunnan University | Wu Z.,Kunming Medical University | Chen Y.,Kunming Medical University | Feng R.,Fifth High School | And 4 more authors.
Chinese-German Journal of Clinical Oncology | Year: 2013

MicroRNAs (miRNAs), which contains approximately 22 nt, belong to a small endogenous, non-coding regulatory single-stranded RNA molecules. They are posttranscriptional regulators of gene expression and highly conserved in evolution. Many researches show that miRNAs involved in many processes, including tumor formation, cell proliferation and apoptosis and proliferation and metastasis of cancer cells. Among that, the relationship between miRNAs and lung cancer is one of the most focal areas for the researchers, because the abnormal expressions of miRNAs were significantly associated with the occurrence and development of lung cancer. The expression level of different miRNAs in lung cancer cells exist differences, compared with normal lung tissue cells, there are two classes of expression: over-expression level and low expression level. In this review, we focused on studying the mechanism of overexpression miRNAs in lung cancer. © 2013 Springer-Verlag Berlin Heidelberg.

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