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The human mineral dust-induced gene, mdig, is a cell growth regulating gene associated with lung cancer.

Authors
Zhang-YD; Lu-Y; Yuan-BZ; Castranova-V; Shi-XL; Stauffer-JL; Demers-LM; Chen-F
Source
Oncogene 2005 Jul; 24(31):4873-4882
NIOSHTIC No.
20028019
Abstract
Environmental or occupational exposure to mineral dusts, mainly silica and asbestos, is associated with an increased incidence of lung inflammation, fibrosis, and/or cancer. To better understand the molecular events associated with these pulmonary diseases, we attempted to identify genes that are regulated by mineral dusts. Using a differential display reverse transcription polymerase chain reaction technique and mRNAs of alveolar macrophages from both normal individuals and coal miners, we identified a novel mineral dust-induced gene named mdig, which had not been fully characterized. The expression of mdig mRNA was detected in alveolar macrophages from coal miners but not from normal subjects. The inducible expression of mdig could be observed in A549 cells exposed to silica particles in a time-dependent manner. The full-length mdig mRNA was expressed in human lung cancer tissues but was barely detectable in the adjacent normal tissues. In addition, a number of lung cancer cell lines constitutively express mdig. Alternative spliced transcripts of mdig were detected in some lung cancer cell lines. Silencing mdig mRNA expression in A549 lung cancer cells by siRNA-mediated RNA interference inhibits cell proliferation and sensitizes the cells to silica-induced cytotoxicity. These results suggest that the mdig gene may be involved in the regulation of cell growth and possibly the development of cancer.
Keywords
Genes; Cell-growth; Cancer; Lung-cancer; Pulmonary-system-disorders; Occupational-exposure; Environmental-exposure; Respiratory-system-disorders; Mineral-dusts; Dusts; Dust-exposure; Silica-dusts; Silicates; Asbestos-dust; Lung-fibrosis; Miners; Coal-miners; Exposure-levels; Exposure-assessment; Mineral-dusts; Minerals
Contact
F Chen, Pathology and Physiology Research Branch, National Institute for Occupational Safety and Health, Mail Stop 2015, 1095 Willowdale Road, Morgantown, WV 26505, USA
CODEN
ONCNES
CAS No.
14808-60-7; 1332-21-4
Publication Date
20050721
Document Type
Journal Article
Email Address
LFD3@cdc.gov
Fiscal Year
2005
NTIS Accession No.
NTIS Price
Issue of Publication
31
ISSN
0950-9232
NIOSH Division
HELD
Source Name
Oncogene
State
WV
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