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DEL-22379 is an inhibitor of ERK dimerization that disrupts EGF-induced co-immunoprecipitation of ERK tagged with hemagglutinin (HA) or FLAG epitopes with an IC50 value of approximately 0.5 μM without affecting ERK phosphorylation or kinase activity (IC50s = >10 μM).1 It inhibits cell growth in a panel of melanoma and colorectal cancer cell lines (IC50s = 150-400 nM). DEL-22379 (15 mg/kg, i.p.) inhibits ERK dimerization in liver extract and tumor tissue and inhibits tumor progression in an A375 mouse xenograft model. It also reduces tumor growth in a BRAF mutant colorectal cancer patient-derived xenograft (PDX) mouse model.
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1. Small molecule inhibition of ERK dimerization prevents tumorigenesis by RAS-