BackgroudAberrant expression of Aldo-Keto reductase family 1 member B10 (AKR1B10) has been observed during the progression of some human carcinomas. However, the expression pattern and clinical relevance of AKR1B10 in breast cancer (BC) need clarification.MethodsThe relationship between the high expression of AKR1B10 and the overall prognosis and disease-free survival of breast cancer patients was analyzed by Kaplan-Meier Plotter database. Breast cancer cell lines MCF-7/AKR1B10 stably overexpressing AKR1B10 and breast cancer cell lines BT-20/shAKR1B10 that knock down AKR1B10 were constructed, respectively. RT-qPCR, Western blot and immunohistochemistry were used to detect the expression of AKR1B10 in breast cancer and its normal tissues. CCK8 cell proliferation assay and cell scratch test were used to detect the proliferation and migration of breast cancer cells. Western blot was used to detect the expression of proliferation-related proteins cyclinD1, c-myc, survivin and EMT-related proteins twist, snail, slug, ZEB1, E-cadherin, PI3K, p-PI3K, AKT, p-AKT, IKBα, p-IKBα, NF-κB p65, and p-NF-κB p65 proteins in breast cancer cells. The PI3K inhibitor LY94002 was used to treat MCF-7 cells to detect PI3K/AKT/NF-κB signal cascade protein Expression, and expression of NF-κB p65 in nucleoproteins and plasma proteins.ResultsIn this study, we found that AKR1B10 expression was higher in BC tissue compared to paired non-cancerous tissue. The expression of AKR1B10 positively correlated with lymph node metastasis, tumor size, Ki67 expression, and p53 expression, but inversely correlated with overall and disease-free survival rates. Gene Ontology (GO) analysis showed that AKR1B10 was closely related to cell proliferation. Overexpression of AKR1B10 facilitated proliferation and migration of BC cells in vitro in association with induction of epithelial-mesenchymal transition. Conversely, knockdown of AKR1B10 inhibited these effects. Mechanistically, silencing AKR1B10 reduced the phosphorylation of PI3K, AKT, and NF-κB p65, whereas AKR1B10 overexpression activated these signaling molecules. Indeed, PI3K inhibition attenuated NF-κB p65 nuclear localization.ConclusionsOur results demonstrate that AKR1B10 promotes proliferation and migration of BC cells and represents a novel prognostic indicator as well as a potential therapeutic target in BC.