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目的:探讨miR-551b-3p对肺癌A549细胞凋亡和放射敏感性的影响及分子机制。方法:将miRNC,miR-551b-3p,anti-miR-NC,anti-miR-551b-3p,si-NC,si-USP9X分别转染至A549中,记为miR-NC组、miR-551b-3p组、anti-miR-NC组、anti-miR-551b-3p组、si-NC组、si-USP9X组;将miR-551b-3p分别与pc DNA和pc DNA-USP9X共转染至A549中,记为miR-551b-3p+pc DNA组、