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SRC-3 (steroid receptor coactivator-3; NCOA3; AIB1) is a
transcriptional coactivator encoded by the NCOA3 gene. It does
not function as a steroid receptor itself; instead, it binds activated nuclear
receptors and other transcription factors and enhances expression of genes
involved in proliferation, metabolism, survival, migration and invasion. SRC-3
is frequently amplified, overexpressed or excessively activated in cancer,
particularly breast cancer, and can promote estrogen-receptor signaling,
PI3K/AKT signaling, growth-factor responses, epithelial–mesenchymal transition,
metastasis and resistance to endocrine or anticancer therapy. The typical
cancer-associated direction is up, while the desired anticancer
modulation is generally down, functional inhibition or protein
degradation.
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