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- W4282964695 abstract "Abstract Bombesin (BB) is an autocrine growth factor for non-small cell lung cancer (NSCLC) cells. BB stimulates whereas the BB2 receptor (R) antagonist PD176252 inhibits NSCLC growth (Moody et al., Eur. J. Pharmacol; 2003; 474:21). The BB2R regulates the transactivation of the EGFR, HER2 and HER3 (Lee et al., BBAMCR 2020; 1867: 118625). HER4 increases the proliferation of NSCLC cells (Mota et al., Oncotarget 2017; 8: 89284). It is unknown if BB2R stimulation increases tyrosine phosphorylation of HER4 and this was investigated using NSCLC cells. BB or neuregulin (NRG1) addition to NSCLC cells increased the phosphorylation of Tyr1284-HER4. By RT-PCR and western blot, mRNA and protein for BB2R, HER4 and NRG1 was present in NCI-H522 and NCI-H661 NSCLC cells. The addition of BB to NCI-H522 or NCI-H661 cells increased phosphorylation of HER4, ERK and AKT which was blocked by PD176252. By immunoprecipitation, HER4 heterodimerized with HER2 and the EGFR after addition of BB to NSCLC cells. PP2 and N-acetylcysteine impaired the ability of BB to increase P-Tyr1284-HER4 in NSCLC cells, which indicates that SRC and reactive oxygen species are essential. Ibrutinib, a tyrosine kinase inhibitor (Rauf et al., Oncogene 2018; 37: 2237), impaired the ability of BB2Rs to regulate HER4 transactivation. Ibrutinib or PD176252 inhibited the growth of NSCLC cells whereas BB or NRG1 increased NSCLC colony formation. The results indicate that peptide receptors for BB regulate HER4 transactivation and the proliferation of NSCLC cells. Citation Format: Terry W. Moody, Irene Ramos-Alvarez, Samuel A. Mantey, Robert T. Jensen. Bombesin receptors regulate transactivation of HER4 [abstract]. In: Proceedings of the American Association for Cancer Research Annual Meeting 2022; 2022 Apr 8-13. Philadelphia (PA): AACR; Cancer Res 2022;82(12_Suppl):Abstract nr 2688." @default.
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- W4282964695 date "2022-06-15" @default.
- W4282964695 modified "2023-09-27" @default.
- W4282964695 title "Abstract 2688: Bombesin receptors regulate transactivation of HER4" @default.
- W4282964695 doi "https://doi.org/10.1158/1538-7445.am2022-2688" @default.
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