title: EGFR Transactivation by Peptide G Protein-Coupled Receptors in Cancer.
abstract: Lung cancer kills approximately 1.3 million citizens in the world annually. The tyrosine kinase inhibitors (TKI) erlotinib and gefitinib are effective anti-tumor agents especially in lung cancer patients with epidermal growth factor receptor (EGFR) mutations. The goal is to increase the potency of TKI in lung cancer patients with wild type EGFR. G protein-coupled receptors (GPCR) transactivate the wild type EGFR in lung cancer cells. The GPCR can be activated by peptide agonists causing phosphatidylinositol turnover or stimulation of adenylylcyclase. Recently, nonpeptide antagonists were found to inhibit the EGFR transactivation caused by peptides. Nonpeptide antagonists for bombesin (BB), neurotensin (NTS) and cholecystokinin (CCK) inhibit lung cancer growth and increase the cytotoxicity of gefitinib. The results suggest that GPCR transactivation of the EGFR may play an important role in cancer cell proliferation.
authors.affiliation: NCI, CCR, 9609 Medical Center Drive, Room 2W-130, Bethesda, MD 20892, USA. moodyt@mail.nih.gov.
authors.forename: Terry W
authors.initials: TW
authors.lastname: Moody
authors.forename: Bernardo
authors.initials: B
authors.lastname: Nuche-Berenguer
authors.forename: Taichi
authors.initials: T
authors.lastname: Nakamura
authors.forename: Robert T
authors.initials: RT
authors.lastname: Jensen
mesh_terms: D000970:Antineoplastic Agents / Q000494:pharmacology* / Q000627:therapeutic use; D001839:Bombesin / Q000037:antagonists & inhibitors; D049109:Cell Proliferation / Q000187:drug effects; D002766:Cholecystokinin / Q000037:antagonists & inhibitors; D004357:Drug Synergism; D066246:ErbB Receptors / Q000378:metabolism*; D000077156:Gefitinib; D006801:Humans; D008175:Lung Neoplasms / Q000188:drug therapy* / Q000378:metabolism; D009496:Neurotensin / Q000037:antagonists & inhibitors; D047428:Protein Kinase Inhibitors / Q000494:pharmacology* / Q000627:therapeutic use; D011799:Quinazolines / Q000627:therapeutic use; D043562:Receptors, G-Protein-Coupled / Q000378:metabolism*
chemical_list: D000970:Antineoplastic Agents; D047428:Protein Kinase Inhibitors; D011799:Quinazolines; D043562:Receptors, G-Protein-Coupled; D009496:Neurotensin; D002766:Cholecystokinin; C512478:EGFR protein, human; D066246:ErbB Receptors; D001839:Bombesin; D000077156:Gefitinib