Circular RNA circLDB2 functions as a competing endogenous RNA to suppress development and promote cisplatin sensitivity in non-squamous non-small cell lung cancer.

Thoracic Cancer
Yuanyuan WangGuojun Zhang

Abstract

Circular RNAs (circRNAs) are covalently closed RNAs and are implicated in the development of non-small cell lung cancer (NSCLC). Here, we identified the precise actions of circRNA LIM domain binding 2 (circLDB2, hsa_circ_0069244) in non-squamous NSCLC development and drug sensitivity. CircLDB2, microRNA (miR)-346, and LIM and calponin-homology domains 1 (LIMCH1) were quantified by quantitative real-time polymerase chain reaction (qRT-PCR) or western blot. Ribonuclease R (RNase R), actinomycin D, and subcellular localization assays were used to characterize circLDB2. Cell proliferation and viability, colony formation, apoptosis, migration, and invasion were gauged by Cell Counting Kit-8 (CCK-8), colony formation, flow cytometry, wound-healing, and transwell assays, respectively. RNA immunoprecipitation (RIP), RNA pull-down, and dual-luciferase reporter assays were used to verify the direct relationship between miR-346 and circLDB2 or LIMCH1. Animal studies were performed to evaluate the impact of circLDB2 in vivo. CircLDB2 was underexpressed in non-squamous NSCLC and was identified as a bona fide circular transcript. Overexpression of circLDB2 impeded cell proliferation, migration, invasion, and enhanced apoptosis and cisplatin ...Continue Reading

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