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Molecular Mechanisms of Malignant Transformation by Low Dose Cadmium in Normal Human Bronchial Epithelial Cells.
Cartularo, Laura; Kluz, Thomas; Cohen, Lisa; Shen, Steven S; Costa, Max.
Afiliación
  • Cartularo L; Department of Environmental Medicine, New York University School of Medicine, New York, New York, United States of America.
  • Kluz T; Department of Environmental Medicine, New York University School of Medicine, New York, New York, United States of America.
  • Cohen L; Department of Biochemistry and Molecular Pharmacology, New York University School of Medicine, New York, New York, United States of America.
  • Shen SS; Department of Environmental Medicine, New York University School of Medicine, New York, New York, United States of America.
  • Costa M; Department of Biochemistry and Molecular Pharmacology, New York University School of Medicine, New York, New York, United States of America.
PLoS One ; 11(5): e0155002, 2016.
Article en En | MEDLINE | ID: mdl-27186882
Cadmium is a carcinogenic metal, the mechanisms of which are not fully understood. In this study, human bronchial epithelial cells were transformed with sub-toxic doses of cadmium (0.01, 0.05, and 0.1 µM) and transformed clones were characterized for gene expression changes using RNA-seq, as well as other molecular measurements. 440 genes were upregulated and 47 genes were downregulated in cadmium clones relative to control clones over 1.25-fold. Upregulated genes were associated mostly with gene ontology terms related to embryonic development, immune response, and cell movement, while downregulated genes were associated with RNA metabolism and regulation of transcription. Several embryonic genes were upregulated, including the transcription regulator SATB2. SATB2 is critical for normal skeletal development and has roles in gene expression regulation and chromatin remodeling. Small hairpin RNA knockdown of SATB2 significantly inhibited growth in soft agar, indicating its potential as a driver of metal-induced carcinogenesis. An increase in oxidative stress and autophagy was observed in cadmium clones. In addition, the DNA repair protein O6-methylguanine-DNA-methyltransferase was depleted by transformation with cadmium. MGMT loss caused significant decrease in cell viability after treatment with the alkylating agent temozolomide, demonstrating diminished capacity to repair such damage. Results reveal various mechanisms of cadmium-induced malignant transformation in BEAS-2B cells including upregulation of SATB2, downregulation of MGMT, and increased oxidative stress.
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Texto completo: 1 Colección: 01-internacional Base de datos: MEDLINE Asunto principal: Cadmio / Carcinógenos / Transformación Celular Neoplásica / Mucosa Respiratoria / Células Epiteliales Límite: Humans Idioma: En Revista: PLoS One Asunto de la revista: CIENCIA / MEDICINA Año: 2016 Tipo del documento: Article País de afiliación: Estados Unidos Pais de publicación: Estados Unidos
Texto completo
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Texto completo: 1 Colección: 01-internacional Base de datos: MEDLINE Asunto principal: Cadmio / Carcinógenos / Transformación Celular Neoplásica / Mucosa Respiratoria / Células Epiteliales Límite: Humans Idioma: En Revista: PLoS One Asunto de la revista: CIENCIA / MEDICINA Año: 2016 Tipo del documento: Article País de afiliación: Estados Unidos Pais de publicación: Estados Unidos