Corporate Banner
Satellite Banner
RNAi
Scientific Community
 
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 4,000+ scientific posters on ePosters
  • More than 5,300+ 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
New Mechanism to Control Human Viral Infections Discovered
Researchers discover long sought after mechanism in human cells that could help treat diseases caused by viruses.
Study Reveals New Role for Hippo Pathway in Suppressing Cancer Immunity
Hippo pathway signaling regulates organ size by moderating cell growth, apoptosis and stem cell renewal, but dysregulation contributes to cancer development.
RNAi Activated in Response to Influenza
Discovery could lead to better ways of combating serious infections, including Ebola and Zika.
Gene Therapy Maintains Clotting Factor for Hemophilia Patients
Following a single gene therapy dose, the highest levels of an essential blood clotting factor IX were observed in hemophilia B patients.
Transporting Microscopic Cargo Between Human Cells
Scientists have developed a virus-inspired delivery system for material transport between cells.
Improving Drug Production with Computer Model
A model has been developed that can be used to improve and accelerate the production of biotherapeutics, cancer drugs, and vaccines.
Turning Off Asthma Attacks
Researchers discover a critical cellular “off” switch for the inflammatory immune response that causes asthma attacks.
New Strategy May Drop Cancer’s Guard
Scientists eye ways to deconstruct tumors’ protective wall with current diabetes drug.
Scientists Identify Unique Genomic Features in Testicular Cancer
The findings may shed light on factors in other cancers that influence their sensitivity to chemotherapy.
Smart Patch Releases Blood Thinners When Needed
Researchers have developed a smart patch that activelly monitors a patient's blood and releases blood thinning drugs when necessary.
SELECTBIO

SELECTBIO Market Reports
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
4,000+ scientific and medical posters
A library of 2,500+ scientific videos on LabTube
5,300+ scientific videos
Close
Premium CrownJOIN TECHNOLOGY NETWORKS PREMIUM FOR FREE!