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JAG1 (Jagged canonical Notch ligand 1; Jagged1) is a
membrane-bound ligand that activates NOTCH-family receptors on adjacent cells.
JAG1–Notch signalling regulates cell fate, differentiation, stem-cell maintenance,
angiogenesis and communication between tumour cells and the tumour
microenvironment. JAG1 is frequently overexpressed in established cancers and can
promote cancer-stem-cell properties, proliferation, epithelial–mesenchymal
transition, migration, invasion, angiogenesis, metastasis and resistance to
anticancer treatment. JAG1 inhibition or downregulation has reduced tumour-cell
growth and invasiveness in several preclinical models. The typical
cancer-associated direction is up, while the desired anticancer
modulation is generally down or blockade of JAG1–Notch
signalling.
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