ArticleJournal of mammary gland biology and neoplasia2026
LMO2 Regulates Epithelial-Mesenchymal Plasticity of Mammary Epithelial Cells.
Article in Journal of mammary gland biology and neoplasia, 2026. The graph could read no effect estimate from its abstract, so it casts no vote on the map. Not yet cited in PubMed.
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Abstract
Cellular plasticity in mammary epithelial cells enables dynamic cell state changes essential for normal development but can be hijacked by breast cancer cells to drive tumor progression and metastasis. However, the molecular factors that maintain cellular plasticity through the regulation of a hybrid cell state (epithelial/mesenchymal) are not fully defined. As LMO2 has been previously shown to regulate metastasis in breast cancer, here we determine the role of LMO2 in normal mammary epithelial cells. Using lineage tracing and knockout mouse models, we find that Lmo2 lineage-traced cells are present in the luminal and basal layer of the mammary gland but have limited proliferative potential. Lmo2 loss does not impact mammary gland development, but acute deletion decreases in vivo reconstitution. Moreover, LMO2 knockdown in mouse and human mammary epithelial cells (MECs) reduces organoid formation. We find that LMO2 regulates the epithelial cell state in MECs and LMO2 knockdown promotes mesenchymal differentiation. Transcriptional profiling of LMO2 knockdown cells reveals significant enrichment in the epithelial-mesenchymal transition (EMT) pathway and upregulation of MCAM, a mesenchymal marker and negative regulator of regenerative capacity in the mammary gland. Altogether, we show that LMO2 plays a role in maintaining cellular plasticity in MECs, adding insight into the normal differentiation programs hijacked by cancer cells to drive tumor progression.
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