Cadmium promotes breast cancer cell proliferation by potentiating the interaction between ERalpha and c-Jun.
Cadmium is an environmental contaminant that enters the body through diet or cigarette smoke. It affects multiple cellular processes, including cell proliferation, differentiation, and apoptosis. Recently, cadmium has been shown to function as an endocrine disruptor, to stimulate estrogen receptor alpha (ERalpha) activity and promote uterine and mammary gland growth in mice. Although cadmium exposure has been associated with the development of breast cancer, the mechanism of action of cadmium remains unclear. To address this deficit, we examined the effects of cadmium treatment on breast cancer cells. We found that ERalpha is required for both cadmium-induced cell growth and modulation of gene expression. We also determined that ERalpha translocates to the nucleus in response to cadmium exposure. Additionally, we provide evidence that cadmium potentiates the interaction between ERalpha and c-Jun and enhances recruitment of this transcription factor complex to the proximal promoters of cyclin D1 and c-myc, thus increasing their expression. This study provides a mechanistic link between cadmium exposure and ERalpha and demonstrates that cadmium plays an important role in the promotion of breast cancer.
Siewit
Christina L
CL
Department of Natural Sciences and Mathematics, Dominican University of California, San Rafael, California 94901, USA.
Gengler
Bridget
B
Vegas
Esera
E
Puckett
Rachel
R
Louie
Maggie C
MC
D015153:Blotting, Western; D001943:Breast Neoplasms / Q000139:chemically induced / Q000378:metabolism*; D002104:Cadmium / Q000494:pharmacology*; D045744:Cell Line, Tumor; D049109:Cell Proliferation / Q000187:drug effects*; D047369:Chromatin Immunoprecipitation; D019938:Cyclin D1 / Q000378:metabolism; D047628:Estrogen Receptor alpha / Q000378:metabolism*; D005260:Female; D006801:Humans; D047468:Immunoprecipitation; D011485:Protein Binding / Q000187:drug effects; D016755:Proto-Oncogene Proteins c-jun / Q000378:metabolism*; D020133:Reverse Transcriptase Polymerase Chain Reaction
D047628:Estrogen Receptor alpha; D016755:Proto-Oncogene Proteins c-jun; D002104:Cadmium; D019938:Cyclin D1