We found that plasma levels of miR-21 www.selleckchem.com/products/mi-503.html were significantly higher in glioma samples than in normal control samples (P < 0.001, Figure 5A), and levels of miR-128 and miR-342-3p were significantly lower in glioma samples than in control samples (P < 0.001, Figure 5B). In addition, there was no significant difference between controls and meningioma patients or pituitary tumor patients (P > 0.008, Figure 5C). The data suggest that the three miRNAs are specifically associated with glioma. Figure 5 Plasma levels of miR-21, miR-128
and miR-342-3p in normal cohorts, meningioma cohorts, pituitary adenoma cohorts and glioma cohorts. (A) Plasma levels of miR-21 are significantly increased in glioma samples Cyclosporin A nmr compared to control samples, (B) and (C) levels of miR-128 and miR-342-3p are markedly reduced in glioma samples compared to control samples. But there was no significant difference between controls and meningioma AZD1480 patients or pituitary adenoma patients (P > 0.05). * P < 0.008 in comparison with normal, # P < 0.008 in comparison with meningioma, △ P < 0.008 in comparison with pituitary adenoma. Discussion In the study, our results showed that miR-21 was up-regulated in plasma samples
of human glioma tumors compared to healthy controls, whereas miR-128 and miR-342-3p were down-regulated. ROC analysis demonstrated the sensitivity and specificity of miR-21, miR-128 and Resveratrol miR-342-3p for GBM diagnosis. In order to further indentify the relationship between plasma level of the three miRNAs and classification and treatment effect of glioma, we next performed statistical analysis of our miRNAs expression data. There was a significant difference in plasma levels of miR-128 between the earlier stages (grade II) and the later subgroups (grade III and IV). Plasma level of miR-342-3p was notably decreased in glioma with ascending tumor grades. Expression levels of three miRNAs in plasma samples of patients treated
reached levels comparable with control subjects. Additionally, the three miRNAs can specifically discriminate glioma from other brain tumor such as pituitary adenoma and meningioma. MiRNAs were firstly discovered in 1993 when Lee et al. studied regulation of developmental timing in Caenorhabditis and reported a small RNA, lineage- definicient-4 (lin-4) [16]. To date, more than 1 000 miRNAs in human have been discovered according to miRBase sequence Database Release 14 (http://www.mirbase.org/). MiRNAs represent approximately 1% of the eukaryotic transcriptome. They play key regulatory roles in a diverse range of pathway, including tumorigenesis and progression of cancer.