Network Pharmacology Reveals Luteolin From Vitex Negundo Novel Targets CDK1/Cyclin B In ER+ Breast Cancer Stem Cells.

Breast cancer remains a leading cause of cancer-related mortality in women, primarily due to Breast Cancer Stem Cells (BCSCs), which contribute to tumor progression, metastasis, and resistance to conventional therapies. Vitex negundo Linn. (VN), a medicinal plant abundant in polyphenolic flavonoids such as luteolin (LT), has previously demonstrated anticancer potential. This study investigates the active metabolite profiling of VN targeting BCSCs and evaluates LT's therapeutic potential through in vitro and in silico approaches. An integrated network pharmacology and computational approach identified VN metabolites targeting BCSCs, including CDK1, cyclin B1/B2, TOP1, GSK-3β, and PARP1. Mutational analysis in MCF-7 cells followed by luteolin (LT) treatment assessed its impact on stemness, gene expression, ROS generation, cell cycle, and apoptosis. Molecular docking and dynamics confirmed LT's strong binding to CDK1/Cyclin B. LT significantly reduced the properties of BCSCs by inhibiting the CDK1/Cyclin B complex and downregulating associated genes. It induced ROS-mediated apoptosis and altered cell cycle distribution, notably increasing G1 and S phase populations. Molecular modeling confirmed strong binding of LT to CDK1/Cyclin B, suggesting disruption of cell cycle regulation and self-renewal. LT binds strongly to CDK1 and Cyclin B proteins, suppressing their activity in MCF-7 cells. This disrupts gene expression linked to BCSC self-renewal, induces apoptosis, and causes cell cycle arrest. LT targeting CDK1/Cyclin B complexes offers promising therapeutic potential for future clinical development against BCSCs. LT from VN shows promise as a therapeutic agent targeting CDK1/Cyclin B in ER+ breast cancer stem cells, supporting its potential for clinical development.