| Structural highlights
Disease
[EGFR_HUMAN] Defects in EGFR are associated with lung cancer (LNCR) [MIM:211980]. LNCR is a common malignancy affecting tissues of the lung. The most common form of lung cancer is non-small cell lung cancer (NSCLC) that can be divided into 3 major histologic subtypes: squamous cell carcinoma, adenocarcinoma, and large cell lung cancer. NSCLC is often diagnosed at an advanced stage and has a poor prognosis.
Function
[EGFR_HUMAN] Receptor tyrosine kinase binding ligands of the EGF family and activating several signaling cascades to convert extracellular cues into appropriate cellular responses. Known ligands include EGF, TGFA/TGF-alpha, amphiregulin, epigen/EPGN, BTC/betacellulin, epiregulin/EREG and HBEGF/heparin-binding EGF. Ligand binding triggers receptor homo- and/or heterodimerization and autophosphorylation on key cytoplasmic residues. The phosphorylated receptor recruits adapter proteins like GRB2 which in turn activates complex downstream signaling cascades. Activates at least 4 major downstream signaling cascades including the RAS-RAF-MEK-ERK, PI3 kinase-AKT, PLCgamma-PKC and STATs modules. May also activate the NF-kappa-B signaling cascade. Also directly phosphorylates other proteins like RGS16, activating its GTPase activity and probably coupling the EGF receptor signaling to the G protein-coupled receptor signaling. Also phosphorylates MUC1 and increases its interaction with SRC and CTNNB1/beta-catenin.[1] [2] [3] [4] [5] [6] [7] [8] [9] [10] [11] [12] [13] Isoform 2 may act as an antagonist of EGF action.[14] [15] [16] [17] [18] [19] [20] [21] [22] [23] [24] [25] [26]
Publication Abstract from PubMed
The epidermal growth factor receptor (EGFR)-targeted monoclonal antibodies are a valid therapeutic strategy for patients with metastatic colorectal cancer (mCRC). However, only a small subset of mCRC patients has therapeutic benefits and there are high demands for EGFR therapeutics with broader patient pool and more potent efficacy. In this study, we report GC1118 exhibiting a different character in terms of binding epitope, affinity, mode of action, and efficacy from other anti-EGFR antibodies. Structural analysis of the EGFR-GC1118 crystal complex revealed that GC1118 recognizes linear, discrete N-terminal epitopes of domain III of EGFR, critical for EGF binding but not overlapping with those of other EGFR-targeted antibodies. GC1118 exhibited superior inhibitory activity against high-affinity EGFR ligands in terms of EGFR binding, triggering EGFR-signaling, and proliferation compared with cetuximab and panitumumab. EGFR signaling driven by low-affinity ligands, on the contrary, was well-inhibited by all the antibodies tested. GC1118 demonstrated robust anti-tumor activity on tumor xenografts with elevated expression of high-affinity ligands in vivo while cetuximab did not. Considering significant role of high-affinity EGFR ligands in modulating tumor microenvironment and inducing resistance to various cancer therapeutics, our study suggests potential therapeutic advantage of GC1118 in terms of efficacy and a range of benefited patient pool.
GC1118, an anti-EGFR antibody with a distinct binding epitope and superior inhibitory activity against high-affinity EGFR ligands.,Lim Y, Yoo J, Kim MS, Hur M, Lee EH, Hur HS, Lee JC, Lee SN, Park TW, Lee K, Chang KH, Kim K, Kang Y, Hong KW, Kim SH, Kim YG, Yoon Y, Nam DH, Yang H, Kim DG, Cho HS, Won J Mol Cancer Ther. 2015 Nov 19. pii: molcanther.0679.2015. PMID:26586721[27]
From MEDLINE®/PubMed®, a database of the U.S. National Library of Medicine.
References
- ↑ Galisteo ML, Dikic I, Batzer AG, Langdon WY, Schlessinger J. Tyrosine phosphorylation of the c-cbl proto-oncogene protein product and association with epidermal growth factor (EGF) receptor upon EGF stimulation. J Biol Chem. 1995 Sep 1;270(35):20242-5. PMID:7657591
- ↑ Derrien A, Druey KM. RGS16 function is regulated by epidermal growth factor receptor-mediated tyrosine phosphorylation. J Biol Chem. 2001 Dec 21;276(51):48532-8. Epub 2001 Oct 15. PMID:11602604 doi:10.1074/jbc.M108862200
- ↑ Shao H, Cheng HY, Cook RG, Tweardy DJ. Identification and characterization of signal transducer and activator of transcription 3 recruitment sites within the epidermal growth factor receptor. Cancer Res. 2003 Jul 15;63(14):3923-30. PMID:12873986
- ↑ Arcaro A, Zvelebil MJ, Wallasch C, Ullrich A, Waterfield MD, Domin J. Class II phosphoinositide 3-kinases are downstream targets of activated polypeptide growth factor receptors. Mol Cell Biol. 2000 Jun;20(11):3817-30. PMID:10805725
- ↑ Habib AA, Chatterjee S, Park SK, Ratan RR, Lefebvre S, Vartanian T. The epidermal growth factor receptor engages receptor interacting protein and nuclear factor-kappa B (NF-kappa B)-inducing kinase to activate NF-kappa B. Identification of a novel receptor-tyrosine kinase signalosome. J Biol Chem. 2001 Mar 23;276(12):8865-74. Epub 2000 Dec 14. PMID:11116146 doi:10.1074/jbc.M008458200
- ↑ Li Y, Ren J, Yu W, Li Q, Kuwahara H, Yin L, Carraway KL 3rd, Kufe D. The epidermal growth factor receptor regulates interaction of the human DF3/MUC1 carcinoma antigen with c-Src and beta-catenin. J Biol Chem. 2001 Sep 21;276(38):35239-42. Epub 2001 Aug 1. PMID:11483589 doi:10.1074/jbc.C100359200
- ↑ Wang SC, Nakajima Y, Yu YL, Xia W, Chen CT, Yang CC, McIntush EW, Li LY, Hawke DH, Kobayashi R, Hung MC. Tyrosine phosphorylation controls PCNA function through protein stability. Nat Cell Biol. 2006 Dec;8(12):1359-68. Epub 2006 Nov 19. PMID:17115032 doi:10.1038/ncb1501
- ↑ Hsu JM, Chen CT, Chou CK, Kuo HP, Li LY, Lin CY, Lee HJ, Wang YN, Liu M, Liao HW, Shi B, Lai CC, Bedford MT, Tsai CH, Hung MC. Crosstalk between Arg 1175 methylation and Tyr 1173 phosphorylation negatively modulates EGFR-mediated ERK activation. Nat Cell Biol. 2011 Feb;13(2):174-81. doi: 10.1038/ncb2158. Epub 2011 Jan 23. PMID:21258366 doi:10.1038/ncb2158
- ↑ Ogiso H, Ishitani R, Nureki O, Fukai S, Yamanaka M, Kim JH, Saito K, Sakamoto A, Inoue M, Shirouzu M, Yokoyama S. Crystal structure of the complex of human epidermal growth factor and receptor extracellular domains. Cell. 2002 Sep 20;110(6):775-87. PMID:12297050
- ↑ Ferguson KM, Berger MB, Mendrola JM, Cho HS, Leahy DJ, Lemmon MA. EGF activates its receptor by removing interactions that autoinhibit ectodomain dimerization. Mol Cell. 2003 Feb;11(2):507-17. PMID:12620237
- ↑ Wood ER, Truesdale AT, McDonald OB, Yuan D, Hassell A, Dickerson SH, Ellis B, Pennisi C, Horne E, Lackey K, Alligood KJ, Rusnak DW, Gilmer TM, Shewchuk L. A unique structure for epidermal growth factor receptor bound to GW572016 (Lapatinib): relationships among protein conformation, inhibitor off-rate, and receptor activity in tumor cells. Cancer Res. 2004 Sep 15;64(18):6652-9. PMID:15374980 doi:10.1158/0008-5472.CAN-04-1168
- ↑ Red Brewer M, Choi SH, Alvarado D, Moravcevic K, Pozzi A, Lemmon MA, Carpenter G. The juxtamembrane region of the EGF receptor functions as an activation domain. Mol Cell. 2009 Jun 26;34(6):641-51. PMID:19560417 doi:10.1016/j.molcel.2009.04.034
- ↑ Lu C, Mi LZ, Grey MJ, Zhu J, Graef E, Yokoyama S, Springer TA. Structural Evidence for Loose Linkage between Ligand Binding and Kinase Activation in the Epidermal Growth Factor Receptor. Mol Cell Biol. 2010 Sep 13. PMID:20837704 doi:10.1128/MCB.00742-10
- ↑ Galisteo ML, Dikic I, Batzer AG, Langdon WY, Schlessinger J. Tyrosine phosphorylation of the c-cbl proto-oncogene protein product and association with epidermal growth factor (EGF) receptor upon EGF stimulation. J Biol Chem. 1995 Sep 1;270(35):20242-5. PMID:7657591
- ↑ Derrien A, Druey KM. RGS16 function is regulated by epidermal growth factor receptor-mediated tyrosine phosphorylation. J Biol Chem. 2001 Dec 21;276(51):48532-8. Epub 2001 Oct 15. PMID:11602604 doi:10.1074/jbc.M108862200
- ↑ Shao H, Cheng HY, Cook RG, Tweardy DJ. Identification and characterization of signal transducer and activator of transcription 3 recruitment sites within the epidermal growth factor receptor. Cancer Res. 2003 Jul 15;63(14):3923-30. PMID:12873986
- ↑ Arcaro A, Zvelebil MJ, Wallasch C, Ullrich A, Waterfield MD, Domin J. Class II phosphoinositide 3-kinases are downstream targets of activated polypeptide growth factor receptors. Mol Cell Biol. 2000 Jun;20(11):3817-30. PMID:10805725
- ↑ Habib AA, Chatterjee S, Park SK, Ratan RR, Lefebvre S, Vartanian T. The epidermal growth factor receptor engages receptor interacting protein and nuclear factor-kappa B (NF-kappa B)-inducing kinase to activate NF-kappa B. Identification of a novel receptor-tyrosine kinase signalosome. J Biol Chem. 2001 Mar 23;276(12):8865-74. Epub 2000 Dec 14. PMID:11116146 doi:10.1074/jbc.M008458200
- ↑ Li Y, Ren J, Yu W, Li Q, Kuwahara H, Yin L, Carraway KL 3rd, Kufe D. The epidermal growth factor receptor regulates interaction of the human DF3/MUC1 carcinoma antigen with c-Src and beta-catenin. J Biol Chem. 2001 Sep 21;276(38):35239-42. Epub 2001 Aug 1. PMID:11483589 doi:10.1074/jbc.C100359200
- ↑ Wang SC, Nakajima Y, Yu YL, Xia W, Chen CT, Yang CC, McIntush EW, Li LY, Hawke DH, Kobayashi R, Hung MC. Tyrosine phosphorylation controls PCNA function through protein stability. Nat Cell Biol. 2006 Dec;8(12):1359-68. Epub 2006 Nov 19. PMID:17115032 doi:10.1038/ncb1501
- ↑ Hsu JM, Chen CT, Chou CK, Kuo HP, Li LY, Lin CY, Lee HJ, Wang YN, Liu M, Liao HW, Shi B, Lai CC, Bedford MT, Tsai CH, Hung MC. Crosstalk between Arg 1175 methylation and Tyr 1173 phosphorylation negatively modulates EGFR-mediated ERK activation. Nat Cell Biol. 2011 Feb;13(2):174-81. doi: 10.1038/ncb2158. Epub 2011 Jan 23. PMID:21258366 doi:10.1038/ncb2158
- ↑ Ogiso H, Ishitani R, Nureki O, Fukai S, Yamanaka M, Kim JH, Saito K, Sakamoto A, Inoue M, Shirouzu M, Yokoyama S. Crystal structure of the complex of human epidermal growth factor and receptor extracellular domains. Cell. 2002 Sep 20;110(6):775-87. PMID:12297050
- ↑ Ferguson KM, Berger MB, Mendrola JM, Cho HS, Leahy DJ, Lemmon MA. EGF activates its receptor by removing interactions that autoinhibit ectodomain dimerization. Mol Cell. 2003 Feb;11(2):507-17. PMID:12620237
- ↑ Wood ER, Truesdale AT, McDonald OB, Yuan D, Hassell A, Dickerson SH, Ellis B, Pennisi C, Horne E, Lackey K, Alligood KJ, Rusnak DW, Gilmer TM, Shewchuk L. A unique structure for epidermal growth factor receptor bound to GW572016 (Lapatinib): relationships among protein conformation, inhibitor off-rate, and receptor activity in tumor cells. Cancer Res. 2004 Sep 15;64(18):6652-9. PMID:15374980 doi:10.1158/0008-5472.CAN-04-1168
- ↑ Red Brewer M, Choi SH, Alvarado D, Moravcevic K, Pozzi A, Lemmon MA, Carpenter G. The juxtamembrane region of the EGF receptor functions as an activation domain. Mol Cell. 2009 Jun 26;34(6):641-51. PMID:19560417 doi:10.1016/j.molcel.2009.04.034
- ↑ Lu C, Mi LZ, Grey MJ, Zhu J, Graef E, Yokoyama S, Springer TA. Structural Evidence for Loose Linkage between Ligand Binding and Kinase Activation in the Epidermal Growth Factor Receptor. Mol Cell Biol. 2010 Sep 13. PMID:20837704 doi:10.1128/MCB.00742-10
- ↑ Lim Y, Yoo J, Kim MS, Hur M, Lee EH, Hur HS, Lee JC, Lee SN, Park TW, Lee K, Chang KH, Kim K, Kang Y, Hong KW, Kim SH, Kim YG, Yoon Y, Nam DH, Yang H, Kim DG, Cho HS, Won J. GC1118, an anti-EGFR antibody with a distinct binding epitope and superior inhibitory activity against high-affinity EGFR ligands. Mol Cancer Ther. 2015 Nov 19. pii: molcanther.0679.2015. PMID:26586721 doi:http://dx.doi.org/10.1158/1535-7163.MCT-15-0679
|
