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  • Title: [Correlations between miRNAs and TGF-β1 in tumor microenvironment of esophageal squamous cell cancer].
    Author: Zhu L, Jin L, Jiang R, Wang Q, Jiang J, Mao C, Chen D.
    Journal: Xi Bao Yu Fen Zi Mian Yi Xue Za Zhi; 2013 May; 29(5):524-8. PubMed ID: 23643275.
    Abstract:
    OBJECTIVE: To detect the levels of mir-18a-5p, mir-23a-3p, mir-24-3p, mir-25-3p and TGF-β1 in tumor microenvironment of esophageal squamous cell cancer (ESCC) patients and explore their clinical significances and correlations. METHODS: The mRNA expressions of mir-18a-5p, mir-23a-3p, mir-24-3p, mir-25-3p and TGF-β1 were measured by real-time quantitative RT-PCR in ESCC cell lines ECA-109 and TE-1, normal esophageal squamous epithelial cells, tumor tissues and tumor-adjacent normal tissues from 52 ESCC patients. The expression of TGF-β1 protein in the three types of cells, tumor tissues and tumor-adjacent normal tissues from 52 ESCC patients was detected by Western blotting. RESULTS: The expressions of mir-18a-5p, mir-24-3p, mir-25-3p and mir-23a-3p in ECA-109 were significantly higher than those in normal esophageal squamous epithelial cells (P<0.05); that is also true of the first three miRNAs in TE-1 (P<0.05). Compared with the normal esophageal squamous epithelial cells, the expression of TGF-β1 was reduced in ECA-109 and TE-1 (P<0.05). Compared with the normal tissues, ESCC tumor tissues were characterized by significant overexpressions of mir-18a-5p, mir-23a-3p, mir-24-3p and mir-25-3p with the rates being 86.5% (45/52), 63.5% (33/52), 78.8% (41/52), 86.5% (45/52), respectively (all P<0.05), and by significantly decreased expression of TGF-β1 (P<0.05). The up-regulation of mir-18a-5p, mir-23a-3p, mir-24-3p, mir-25-3p and the down-regulation of TGF-β1 were not correlated with sex, age, tumor size and tumor site in ESCC patients, but the overexpressions of mir-18a-5p, mir-23a-3p, mir-25-3p were significantly related to tumor differentiation (P<0.05), and a significant variation of mir-25-3p was found in different T stages (P<0.05). TGF-β1 level was lower in tumor tissues compared to normal tissues from the 52 ESCC patients, and higher in stage TIII/IV; than stage TI/II;(P<0.05), and a significant variation was found in histological differentiation (P<0.05). There was no correlation between mir-18a-5p, mir-23a-3p and TGF-β1, but mir-24-3p and mir-25-3p had an inverse correlation with TGF-β1 in tumor microenvironment of ESCC. CONCLUSION: Mir-18a-5p, mir-23a-3p, mir-24-3p, mir-25-3p and TGF-β1 might play important roles in the carcinogenic process of ESCC.
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