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Caveolin-1 regulates lung cancer stem-like cell induction and p53 inactivation in carbon nanotube-driven tumorigenesis.

Authors
Luanpitpong-S; Wang-L; Stueckle-TA; Tse-W; Chen-YC; Rojanasakul-Y
Source
OncoTarget 2014 Jun; 5(11):3541-3554
NIOSHTIC No.
20044808
Abstract
Cancer stem cells (CSCs) may represent targets for carcinogenic initiation by chemical and environmental agents. Recent studies have raised a concern over the potential carcinogenicity of carbon nanotubes (CNTs), one of the most commonly used engineered nanomaterials with asbestos-like properties. Here, we show that chronic (6-month) exposure of human lung epithelial cells to single-walled (SW) CNTs at the workplace-relevant concentration induced an emergence of lung CSCs, as indicated by the induction of CSC tumor spheres and side population (SP). These CSCs, which were found to overexpress tumor promoter caveolin-1 (Cav-1), displayed aggressive cancer phenotypes of apoptosis resistance and enhanced cell invasion and migration compared with their non-CSC counterpart. Using gene manipulation strategies, we reveal for the first time that Cav-1 plays an essential role in CSC regulation and aggressiveness of SWCNT-transformed cells partly through p53 dysregulation, consistent with their suggested role by microarray and gene ontology analysis. Cav-1 not only promoted tumorigenesis in a xenograft mouse model but also metastasis of the transformed cells to neighboring tissues. Since CSCs are crucial to the initiation and early development of carcinogenesis, our findings on CSC induction by SWCNTs and Cav-1 could aid in the early detection and risk assessment of the disease.
Keywords
Cancer; Carcinogens; Carcinogenesis; Carcinogenicity; Nanotechnology; In-vitro-study; Lung-cancer; Lung-cells; Lung-disease; Lung-disorders; Respiratory-system-disorders; Cell-biology; Cell-function; Cell-transformation; Cellular-function; Author Keywords: caveolin-1; p53; lung; cancer stem-like cells; tumorigenesis; carbon nanotubes
Contact
Sudjit Luanpitpong, Pathology and Physiology Research Branch, Health Effects Laboratory Division, National Institute for Occupational Safety and Health, Morgantown, WV 26505, USA
Publication Date
20140615
Document Type
Journal Article
Email Address
suidjit@gmail.com
Fiscal Year
2014
NTIS Accession No.
NTIS Price
Identifying No.
M082014
Issue of Publication
11
ISSN
1949-2553
NIOSH Division
HELD
Priority Area
Manufacturing
Source Name
OncoTarget
State
WV
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