MicroRNA miR-24-3p reduces DNA damage responses, apoptosis, and susceptibility to chronic obstructive pulmonary disease.

Journal Article (Journal Article)

The pathogenesis of chronic obstructive pulmonary disease (COPD) involves aberrant responses to cellular stress caused by chronic cigarette smoke (CS) exposure. However, not all smokers develop COPD and the critical mechanisms that regulate cellular stress responses to increase COPD susceptibility are not understood. Because microRNAs are well-known regulators of cellular stress responses, we evaluated microRNA expression arrays performed on distal parenchymal lung tissue samples from 172 subjects with and without COPD. We identified miR-24-3p as the microRNA that best correlated with radiographic emphysema and validated this finding in multiple cohorts. In a CS exposure mouse model, inhibition of miR-24-3p increased susceptibility to apoptosis, including alveolar type II epithelial cell apoptosis, and emphysema severity. In lung epithelial cells, miR-24-3p suppressed apoptosis through the BH3-only protein BIM and suppressed homology-directed DNA repair and the DNA repair protein BRCA1. Finally, we found BIM and BRCA1 were increased in COPD lung tissue, and BIM and BRCA1 expression inversely correlated with miR-24-3p. We concluded that miR-24-3p, a regulator of the cellular response to DNA damage, is decreased in COPD, and decreased miR-24-3p increases susceptibility to emphysema through increased BIM and apoptosis.

Full Text

Duke Authors

Cited Authors

  • Nouws, J; Wan, F; Finnemore, E; Roque, W; Kim, S-J; Bazan, I; Li, C-X; Skold, CM; Dai, Q; Yan, X; Chioccioli, M; Neumeister, V; Britto, CJ; Sweasy, J; Bindra, R; Wheelock, ÅM; Gomez, JL; Kaminski, N; Lee, PJ; Sauler, M

Published Date

  • January 25, 2021

Published In

Volume / Issue

  • 6 / 2

PubMed ID

  • 33290275

Pubmed Central ID

  • PMC7934877

Electronic International Standard Serial Number (EISSN)

  • 2379-3708

Digital Object Identifier (DOI)

  • 10.1172/jci.insight.134218

Language

  • eng

Conference Location

  • United States