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• W4361825241 abstract "<div>Abstract<p>Therapies targeting the tyrosine kinase receptor HER2 have significantly improved survival of patients with HER2⁺ cancer. However, both <i>de novo</i> and acquired resistance remain a challenge, particularly in the brain metastatic setting. Here we report that, unlike other HER tyrosine kinase receptors, HER2 possesses a binding motif in its cytosolic juxtamembrane region that allows interaction with members of the Ezrin/Radixin/Moesin (ERM) family. Under physiologic conditions, this interaction controls the localization of HER2 in ERM-enriched domains and stabilizes HER2 in a catalytically repressed state. In HER2⁺ breast cancers, low expression of Moesin correlated with increased HER2 expression. Restoring expression of ERM proteins in HER2⁺ breast cancer cells was sufficient to revert HER2 activation and inhibit HER2-dependent proliferation. A high-throughput assay recapitulating the HER2–ERM interaction allowed for screening of about 1,500 approved drugs. From this screen, we found Zuclopenthixol, an antipsychotic drug that behaved as a Moesin-mimicking compound, because it directly binds the juxtamembrane region of HER2 and specifically inhibits HER2 activation in HER2⁺ cancers, as well as activation of oncogenic mutated and truncated forms of HER2. Zuclopenthixol efficiently inhibited HER2⁺ breast tumor progression <i>in vitro</i> and <i>in vivo</i> and, more importantly, showed significant activity on HER2⁺ brain tumor progression. Collectively, these data reveal a novel class of allosteric HER2 inhibitors, increasing the number of approaches to consider for intervention on HER2⁺ breast cancers and brain metastases.</p>Significance:<p>This study demonstrates the functional role of Moesin in maintaining HER2 in a catalytically repressed state and provides novel therapeutic approaches targeting HER2⁺ breast cancers and brain metastasis using Moesin-mimicking compounds.</p></div>" @default.
• W4361825241 created "2023-04-05" @default.
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• W4361825241 date "2023-03-31" @default.
• W4361825241 modified "2023-09-27" @default.
• W4361825241 title "Data from Allosteric Inhibition of HER2 by Moesin-Mimicking Compounds Targets HER2-Positive Cancers and Brain Metastases" @default.
• W4361825241 doi "https://doi.org/10.1158/0008-5472.c.6513291.v1" @default.
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