Corporate Banner
Satellite Banner
Technology
Networks
Scientific Communities
 
Become a Member | Sign in
Home>News>This Article
  News
Return

Cigarette Smoke Mediates Epigenetic Repression of miR-487b During Pulmonary Carcinogenesis

Published: Tuesday, February 19, 2013
Last Updated: Tuesday, February 19, 2013
Bookmark and Share
This study utilized an in vitro model system to examine miRNA alterations mediated by cigarette smoke condensate in normal human respiratory epithelia and lung cancer cells derived from smokers as well as nonsmokers.

Abstract

MicroRNAs are critical mediators of stem cell pluripotency, differentiation, and malignancy. Limited information exists regarding microRNA alterations that facilitate initiation and progression of human lung cancers. In this study, array techniques were used to evaluate microRNA expression in normal human respiratory epithelia and lung cancer cells cultured in the presence or absence of cigarette smoke condensate (CSC). Under relevant exposure conditions, CSC significantly repressed miR-487b. Subsequent experiments demonstrated that miR-487b directly targeted SUZ12, BMI1, WNT5A, MYC, and KRAS. Repression of miR-487b correlated with overexpression of these targets in primary lung cancers and coincided with DNA methylation, de novo nucleosome occupancy, and decreased H2AZ and TCF1 levels within the miR-487b genomic locus. Deoxyazacytidine derepressed miR-487b and attenuated CSC-mediated silencing of miR-487b. Constitutive expression of miR-487b abrogated Wnt signaling, inhibited in vitro proliferation and invasion of lung cancer cells mediated by CSC or overexpression of miR-487b targets, and decreased growth and metastatic potential of lung cancer cells in vivo. Collectively, these findings indicate that miR-487b is a tumor suppressor microRNA silenced by epigenetic mechanisms during tobacco-induced pulmonary carcinogenesis and suggest that DNA demethylating agents may be useful for activating miR-487b for lung cancer therapy.

This article was published online in The Journal of Clinical Investidation and is free to access.


Further Information

Join For Free

Access to this exclusive content is for Technology Networks Premium members only.

Join Technology Networks Premium for free access to:

  • Exclusive articles
  • Presentations from international conferences
  • Over 3,500+ scientific posters on ePosters
  • More Than 5,000+ scientific videos on LabTube
  • 35 community eNewsletters


Sign In



Forgotten your details? Click Here
If you are not a member you can join here

*Please note: By logging into TechnologyNetworks.com you agree to accept the use of cookies. To find out more about the cookies we use and how to delete them, see our privacy policy.


Scientific News
Mass Spec Technology Drives Innovation Across the Biopharma Workflow
With greater resolving power, analytical speed, and accuracy, new mass spectrometry technology and techniques are infiltrating the biopharmaceuticals workflow.
One Step Closer to Precision Medicine for Chronic Lung Disease Sufferers
A study led by University of North Carolina at Chapel Hill, and National Jewish Health, has provided evidence of links between SNPs and known COPD blood protein biomarkers.
A Diversity of Genomes
New DNA from understudied groups reveals modern genetic variation, ancient population shifts.
“Sixth Sense” May Be More Than Just A Feeling
The NIH Study shows that two young patients with a mutation in the PIEZ02 have problems with touch and proprioception, or body awareness.
Gene Could Reduce Female Mosquitoes
Virginia Tech researchers have found a gene that can reduce female mosquitoes over many generations.
Biomolecular Manufacturing ‘On-the-Go’
Wyss Institute team unveils a low-cost, portable method to manufacture biomolecules for a wide range of vaccines, other therapies as well as diagnostics.
Improving Crop Efficiency with CRISPR
New study of CRISPR-Cas9 technology from Virginia Tech shows potential to improve crop efficiency.
Fighting Cancer with Sticky Nanoparticles
Treatment that uses bioadhesive nanoparticles drug carriers proved more effective than conventional treatments for certain cancers.
Stem Cell ‘Heart Patch’ Almost Perfected
Scientists aiming to perfect and test 3D "heart patches" in animal model, last hurdle before human patients.
Fighting Plant Pathogens with RNA
Researchers develop strategy that could lead to environmentally friendly fungicide to fight pathogens.
Scroll Up
Scroll Down
Skyscraper Banner

Skyscraper Banner
Go to LabTube
Go to eposters
 
Access to the latest scientific news
Exclusive articles
Upload and share your posters on ePosters
Latest presentations and webinars
View a library of 1,800+ scientific and medical posters
3,500+ scientific and medical posters
A library of 2,500+ scientific videos on LabTube
5,000+ scientific videos
Close
Premium CrownJOIN TECHNOLOGY NETWORKS PREMIUM FOR FREE!