期刊
ONCOTARGET
卷 7, 期 24, 页码 37013-37029出版社
IMPACT JOURNALS LLC
DOI: 10.18632/oncotarget.9455
关键词
cancer; HER3; ITCH/AIP4; antibody; treatment
资金
- program Investissement d'Avenir [ANR-10-LABX-53-01]
- grant AAP13 Fonds Unique Interministeriel FUI [UmAbHER3 F120402M]
- Medical Research Council [MC_U132670600] Funding Source: researchfish
- MRC [MC_U132670600] Funding Source: UKRI
We characterized the mechanism of action of the neuregulin-non-competitive anti-HER3 therapeutic antibody 9F7-F11 that blocks the PI3K/AKT pathway, leading to cell cycle arrest and apoptosis in vitro and regression of pancreatic and breast cancer in vivo. We found that 9F7-F11 induces rapid HER3 down-regulation. Specifically, 9F7-F11-induced HER3 ubiquitination and degradation in pancreatic, breast and prostate cancer cell lines was driven mainly by the itchy E3 ubiquitin ligase (ITCH/AIP4). Overexpression of the ITCH/AIP4 inhibitor N4BP1 or small-interfering RNA-mediated knockdown of ITCH/AIP4 inhibited HER3 ubiquitination/degradation and PI3K/AKT signaling blockade induced by 9F7-F11. Moreover, 9F7-F11-mediated JNK1/2 phosphorylation led to ITCH/AIP4 activation and recruitment to HER3 for receptor ubiquitination and degradation. ITCH/AIP4 activity was activated by the deubiquitinases USP8 and USP9X, as demonstrated by RNA interference. Taken together, our results suggest that 9F7-F11-induced HER3 ubiquitination and degradation in cancer cells mainly occurs through JNK1/2-dependent ITCH/AIP4 activation.
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