JAG1 can activate NOTCH4 signaling, based on co-culture of JAG1-expressing and NOTCH4 expressing HUVEC cells (human umbilical vein endothelial cell line) (Shawber et al. 2007). JAG1 and NOTCH4 are upregulated in human ER+ breast cancers resistant to anti-estrogen therapy, which correlates with an increase in population of breast cancer stem cells (Simoes et al. 2015).
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