Complex Epigenetic Regulation of Chemotherapy Resistance and Biology in Esophageal Squamous Cell Carcinoma via MicroRNAs

• Published in: International journal of molecular sciences Vol. 19; no. 2; p. 499
• Main Authors: Lindner, Kirsten, Eichelmann, Ann-Kathrin, Matuszcak, Christiane, Hussey, Damian, Haier, Jörg, Hummel, Richard
• Format: Journal Article
• Language: English
• Published: Basel MDPI AG 01.02.2018; MDPI
• Subjects: Adhesion tests; Apoptosis; Bcl-2 protein; Biology; Biotechnology; Cancer therapies; Cell cycle; Chemoresistance; Chemotherapy; Cisplatin; Drug resistance; Esophageal cancer; esophageal squamous cell carcinoma; Esophagus; K270: KYSE-270; K410: KYSE-410; metastasis; microRNA; MicroRNAs; miR: miRNA; miRNA; p53 Protein; resistance; Sensitizing; Squamous cell carcinoma; Western blotting
• ISSN: 1422-0067; 1661-6596; 1422-0067
• DOI: 10.3390/ijms19020499

Background: Resistance towards chemotherapy is a major obstacle in the treatment of esophageal squamous cell carcinoma (ESCC). We investigated the role of specific microRNAs in chemotherapy resistance and tumor biology. Methods: We selected three microRNAs from characteristic microRNA signatures of resistant ESCC (hsa-miR-125a-5p, hsa-miR-130a-3p, hsa-miR-1226-3p), and hsa-miR-148a-3p. Effects on chemotherapy, adhesion, migration, apoptosis and cell cycle were assessed in six ESCC cell lines. Target analyses were performed using Western blotting and luciferase techniques. Results: MiR-130a-3p sensitized cells towards cisplatin in 100% of cell lines, miR-148a-3p in 83%, miR-125a-5p in 67%, miR-1226-3p in 50% (p ≤ 0.04). MiR-130a-3p sensitized 83% of cell lines towards 5-FU, miR-148a-3p/miR-125a-5p/miR-1226-3p only 33% (p ≤ 0.015). Several resistance-relevant pathways seem to be targeted on various levels. Bcl-2 was confirmed as a direct target of miR-130a-3p and miR-148a-3p, and p53 as a target of miR-125a-5p. All microRNAs decreased migration and adhesion, except miR-130a-3p, and increased apoptosis. Simultaneous manipulation of two microRNAs exhibited additive sensitizing effects towards cisplatin in 50% (miR-125a-5p/miR-148a-3p), and 75% (miR-148a-3p/miR-130a-3p) of cell lines (p ≤ 0.006). Conclusion: Our data present strong evidence that specific microRNA signatures are responsible for drug resistance and aggressiveness of ESCC. Final functional readout of these complex processes appears to be more important than single microRNA-target interactions.