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0This research identifies escape from dormancy as the primary bottleneck for breast cancer spreading to the brain, rather than the initial entry into the organ. Using advanced intravital imaging, the study demonstrates that disseminated tumor cells (DTCs) remain quiet while nestled against astrocyte endfeet within the brain's vascular niche. At these sites, a specific protein called laminin-211 is deposited by astrocytes to enforce cellular rest. This suppressive signal is transmitted through the dystroglycan receptor on tumor cells, which physically traps the growth-promoting protein YAP in the cytoplasm to prevent proliferation. When these astrocyte endfeet are stripped away or the signaling axis is disrupted, YAP moves into the nucleus, triggering the transition from dormant single cells into fatal brain metastases.
References:
Dai J, Cimino P J, Gouin III K H, et al. Astrocytic laminin-211 drives disseminated breast tumor cell dormancy in brain[J]. Nature Cancer, 2022, 3(1): 25-42.
