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The immunological targets of estrogen at the molecular, humoral, and cellular level have been well documented, as has estrogen's role in establishing a gender bias in autoimmunity and cancer. During a healthy immune response, activation-induced deaminase (AID) deaminates cytosines at immunoglobulin (Ig) loci, initiating somatic hypermutation (SHM) and class switch recombination (CSR). Protein levels of nuclear AID are tightly controlled, as unregulated expression can lead to alterations in the immune response. Furthermore, hyperactivation of AID outside the immune system leads to oncogenesis. Here, we demonstrate that the estrogen-estrogen receptor complex binds to the AID promoter, enhancing AID messenger RNA expression, leading to a direct increase in AID protein production and alterations in SHM and CSR at the Ig locus. Enhanced translocations of the c-myc oncogene showed that the genotoxicity of estrogen via AID production was not limited to the Ig locus. Outside of the immune system (e.g., breast and ovaries), estrogen induced AID expression by >20-fold. The estrogen response was also partially conserved within the DNA deaminase family (APOBEC3B, -3F, and -3G), and could be inhibited by tamoxifen, an estrogen antagonist. We therefore suggest that estrogen-induced autoimmunity and oncogenesis may be derived through AID-dependent DNA instability.

Original publication

DOI

10.1084/jem.20080521

Type

Journal article

Journal

J exp med

Publication Date

16/01/2009

Volume

206

Pages

99 - 111

Keywords

Animals, B-Lymphocytes, Cell Line, Cell Line, Tumor, Cells, Cultured, Cytidine Deaminase, Cytosine Deaminase, Electrophoretic Mobility Shift Assay, Estrogen Receptor alpha, Estrogens, Female, Gene Expression Regulation, Enzymologic, Humans, Immunoglobulin Class Switching, Mice, Mice, Inbred BALB C, Mutation, Oncogene Proteins, Fusion, Protein Binding, Response Elements, Reverse Transcriptase Polymerase Chain Reaction, Somatic Hypermutation, Immunoglobulin, Transcription, Genetic, fas Receptor