The epidermal growth factor receptor is a member of the ErbB family of receptors, a subfamily of four closely related receptor tyrosine kinases: EGFR (ErbB-1), HER2/neu (ErbB-2), Her 3 (ErbB-3) and Her 4 (ErbB-4). In many cancer types, mutations affecting EGFR expression or activity could result in cancer.[6]
Deficient signaling of the EGFR and other receptor tyrosine kinases in humans is associated with diseases such as Alzheimer's, while over-expression is associated with the development of a wide variety of tumors. Interruption of EGFR signalling, either by blocking EGFR binding sites on the extracellular domain of the receptor or by inhibiting intracellular tyrosine kinase activity, can prevent the growth of EGFR-expressing tumours and improve the patient's condition[citation needed].
Function
Epidermal growth factor receptor (EGFR) is a transmembrane protein that is activated by binding of its specific ligands, including epidermal growth factor and transforming growth factor alpha (TGF-α).[7] ErbB2 has no known direct activating ligand, and may be in an activated state constitutively or become active upon heterodimerization with other family members such as EGFR.
Upon activation by its growth factor ligands, EGFR undergoes a transition from an inactive monomeric form to an active homodimer.[8] – although there is some evidence that preformed inactive dimers may also exist before ligand binding.[9] In addition to forming homodimers after ligand binding, EGFR may pair with another member of the ErbB receptor family, such as ErbB2/Her2/neu, to create an activated heterodimer. There is also evidence to suggest that clusters of activated EGFRs form, although it remains unclear whether this clustering is important for activation itself or occurs subsequent to activation of individual dimers.[10]
EGFR dimerization stimulates its intrinsic intracellular protein-tyrosine kinase activity. As a result, autophosphorylation of several tyrosine (Y) residues in the C-terminal domain of EGFR occurs. These include Y992, Y1045, Y1068, Y1148 and Y1173, as shown in the adjacent diagram.[11] This autophosphorylation elicits downstream activation and signaling by several other proteins that associate with the phosphorylated tyrosines through their own phosphotyrosine-binding SH2 domains. These downstream signaling proteins initiate several signal transduction cascades, principally the MAPK, Akt and JNK pathways, leading to DNA synthesis and cell proliferation.[12] Such proteins modulate phenotypes such as cell migration, adhesion, and proliferation. Activation of the receptor is important for the innate immune response in human skin. Additionally, the kinase domain of the EGFR can cross-phosphorylate the tyrosine residues of other receptors with which it is aggregated and thereby activate itself.
Mutations that lead to EGFR overexpression (known as upregulation or amplification) have been associated with a number of cancers, including adenocarcinoma of the lung (40% of cases), anal cancers,[18]glioblastoma (50%) and epithelian tumors of the head and neck (80–100%).[19] These somatic mutations involving EGFR lead to its constant activation, which produces uncontrolled cell division.[20] In glioblastoma a specific mutation of EGFR, called EGFRvIII, is often observed.[21] Mutations, amplifications or misregulations of EGFR or family members are implicated in about 30% of all epithelial cancers.[22]
Inflammatory disease
Aberrant EGFR signaling has been implicated in psoriasis, eczema and atherosclerosis.[23][24] However, its exact roles in these conditions are ill-defined.
Monogenic disease
A single child displaying multi-organ epithelial inflammation was found to have a homozygous loss of function mutation in the EGFR gene. The pathogenicity of the EGFR mutation was supported by in vitro experiments and functional analysis of a skin biopsy. His severe phenotype reflects many previous research findings into EGFR function. His clinical features included a papulopustular rash, dry skin, chronic diarrhoea, abnormalities of hair growth, breathing difficulties and electrolyte imbalances.[25]
Many therapeutic approaches are aimed at the EGFR. Cetuximab and panitumumab are examples of monoclonal antibodyinhibitors. However the former is of the IgG1 type, the latter of the IgG2 type; consequences on antibody-dependent cellular cytotoxicity can be quite different.[33] Other monoclonals in clinical development are zalutumumab, nimotuzumab, and matuzumab. The monoclonal antibodies block the extracellular ligand binding domain. With the binding site blocked, signal molecules can no longer attach there and activate the tyrosine kinase.
Another method is using small molecules to inhibit the EGFR tyrosine kinase, which is on the cytoplasmic side of the receptor. Without kinase activity, EGFR is unable to activate itself, which is a prerequisite for binding of downstream adaptor proteins. Ostensibly by halting the signaling cascade in cells that rely on this pathway for growth, tumor proliferation and migration is diminished. Gefitinib, erlotinib, brigatinib and lapatinib (mixed EGFR and ERBB2 inhibitor) are examples of small molecule kinase inhibitors.
CimaVax-EGF, an active vaccine targeting EGF as the major ligand of EGF, uses a different approach, raising antibodies against EGF itself, thereby denying EGFR-dependent cancers of a proliferative stimulus;[34] it is in use as a cancer therapy against non-small-cell lung carcinoma (the most common form of lung cancer) in Cuba, and is undergoing further trials for possible licensing in Japan, Europe, and the United States.[35]
There are several quantitative methods available that use protein phosphorylation detection to identify EGFR family inhibitors.[36]
New drugs such as osimertinib, gefitinib, erlotinib and brigatinib directly target the EGFR. Patients have been divided into EGFR-positive and EGFR-negative, based upon whether a tissue test shows a mutation. EGFR-positive patients have shown a 60% response rate, which exceeds the response rate for conventional chemotherapy.[37]
However, many patients develop resistance. Two primary sources of resistance are the T790M mutation and MET oncogene.[37] However, as of 2010 there was no consensus of an accepted approach to combat resistance nor FDA approval of a specific combination. Clinical trial phase II results reported for brigatinib targeting the T790M mutation, and brigatinib received Breakthrough Therapy designation status by FDA in Feb. 2015.
The most common adverse effect of EGFR inhibitors, found in more than 90% of patients, is a papulopustular rash that spreads across the face and torso; the rash's presence is correlated with the drug's antitumor effect.[38] In 10% to 15% of patients the effects can be serious and require treatment.[39][40]
Some tests are aiming at predicting benefit from EGFR treatment, as Veristrat.[41]
Laboratory research using genetically engineered stem cells to target EGFR in mice was reported in 2014 to show promise.[42] EGFR is a well-established target for monoclonal antibodies and specific tyrosine kinase inhibitors.[43]
Target for imaging agents
Imaging agents have been developed which identify EGFR-dependent cancers using labeled EGF.[44] The feasibility of in vivo imaging of EGFR expression has been demonstrated in several studies.[45][46]
It has been proposed that certain computed tomography findings such as ground-glass opacities, air bronchogram, spiculated margins, vascular convergence, and pleural retraction can predict the presence of EGFR mutation in patients with non-small cell lung cancer.[47]
Interactions
Epidermal growth factor receptor has been shown to interact with:
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^Olive DM (October 2004). "Quantitative methods for the analysis of protein phosphorylation in drug development". Expert Review of Proteomics. 1 (3): 327–41. doi:10.1586/14789450.1.3.327. PMID15966829. S2CID30003827.
^Roskoski Jr R (January 2014). "The ErbB/HER family of protein-tyrosine kinases and cancer". Pharmacological Research. 79: 34–74. doi:10.1016/j.phrs.2013.11.002. PMID24269963.
^Lucas LJ, Tellez CA, Castilho ML, Lee CL, Hupman MA, Vieira LS, Ferreira I, Raniero L, Hewitt KC (May 2015). "Development of a sensitive, stable and EGFR-specific molecular imaging agent for surface enhanced Raman spectroscopy". Journal of Raman Spectroscopy. 46 (5): 434–446. Bibcode:2015JRSp...46..434L. doi:10.1002/jrs.4678.
^Herrera Ortiz AF, Cadavid Camacho T, Vásquez Perdomo A, Castillo Herazo V, Arambula Neira J, Yepes Bustamante M, Cadavid Camacho E. Clinical and CT patterns to predict EGFR mutation in patients with non-small cell lung cancer: A systematic literature review and meta-analysis. European Journal of Radiology Open.2022;9:100400. https://doi.org/10.1016/j.ejro.2022.100400
^Bonaccorsi L, Carloni V, Muratori M, Formigli L, Zecchi S, Forti G, Baldi E (October 2004). "EGF receptor (EGFR) signaling promoting invasion is disrupted in androgen-sensitive prostate cancer cells by an interaction between EGFR and androgen receptor (AR)". International Journal of Cancer. 112 (1): 78–86. doi:10.1002/ijc.20362. hdl:2158/395766. PMID15305378. S2CID46121331.
^Bonaccorsi L, Muratori M, Carloni V, Marchiani S, Formigli L, Forti G, Baldi E (August 2004). "The androgen receptor associates with the epidermal growth factor receptor in androgen-sensitive prostate cancer cells". Steroids. 69 (8–9): 549–52. doi:10.1016/j.steroids.2004.05.011. hdl:2158/395763. PMID15288768. S2CID23831527.
^Kim M, Tezuka T, Suziki Y, Sugano S, Hirai M, Yamamoto T (October 1999). "Molecular cloning and characterization of a novel cbl-family gene, cbl-c". Gene. 239 (1): 145–54. doi:10.1016/S0378-1119(99)00356-X. PMID10571044.
^Keane MM, Ettenberg SA, Nau MM, Banerjee P, Cuello M, Penninger J, Lipkowitz S (June 1999). "cbl-3: a new mammalian cbl family protein". Oncogene. 18 (22): 3365–75. doi:10.1038/sj.onc.1202753. PMID10362357. S2CID28195948.
^Takahashi K, Suzuki K, Tsukatani Y (July 1997). "Induction of tyrosine phosphorylation and association of beta-catenin with EGF receptor upon tryptic digestion of quiescent cells at confluence". Oncogene. 15 (1): 71–8. doi:10.1038/sj.onc.1201160. PMID9233779. S2CID10127053.
^Stortelers C, Souriau C, van Liempt E, van de Poll ML, van Zoelen EJ (July 2002). "Role of the N-terminus of epidermal growth factor in ErbB-2/ErbB-3 binding studied by phage display". Biochemistry. 41 (27): 8732–41. doi:10.1021/bi025878c. PMID12093292.
^Blagoev B, Kratchmarova I, Ong SE, Nielsen M, Foster LJ, Mann M (March 2003). "A proteomics strategy to elucidate functional protein-protein interactions applied to EGF signaling". Nature Biotechnology. 21 (3): 315–8. doi:10.1038/nbt790. PMID12577067. S2CID26838266.
^Tortora G, Damiano V, Bianco C, Baldassarre G, Bianco AR, Lanfrancone L, Pelicci PG, Ciardiello F (February 1997). "The RIalpha subunit of protein kinase A (PKA) binds to Grb2 and allows PKA interaction with the activated EGF-receptor". Oncogene. 14 (8): 923–8. doi:10.1038/sj.onc.1200906. PMID9050991. S2CID10640461.
^Sun J, Nanjundan M, Pike LJ, Wiedmer T, Sims PJ (May 2002). "Plasma membrane phospholipid scramblase 1 is enriched in lipid rafts and interacts with the epidermal growth factor receptor". Biochemistry. 41 (20): 6338–45. doi:10.1021/bi025610l. PMID12009895.
^Sarmiento M, Puius YA, Vetter SW, Keng YF, Wu L, Zhao Y, Lawrence DS, Almo SC, Zhang ZY (July 2000). "Structural basis of plasticity in protein tyrosine phosphatase 1B substrate recognition". Biochemistry. 39 (28): 8171–9. doi:10.1021/bi000319w. PMID10889023.
^Sato K, Kimoto M, Kakumoto M, Horiuchi D, Iwasaki T, Tokmakov AA, Fukami Y (September 2000). "Adaptor protein Shc undergoes translocation and mediates up-regulation of the tyrosine kinase c-Src in EGF-stimulated A431 cells". Genes to Cells. 5 (9): 749–64. doi:10.1046/j.1365-2443.2000.00358.x. PMID10971656. S2CID26366427.
^Sehat B, Andersson S, Girnita L, Larsson O (July 2008). "Identification of c-Cbl as a new ligase for insulin-like growth factor-I receptor with distinct roles from Mdm2 in receptor ubiquitination and endocytosis". Cancer Research. 68 (14): 5669–77. doi:10.1158/0008-5472.CAN-07-6364. PMID18632619.
Filardo EJ (February 2002). "Epidermal growth factor receptor (EGFR) transactivation by estrogen via the G-protein-coupled receptor, GPR30: a novel signaling pathway with potential significance for breast cancer". The Journal of Steroid Biochemistry and Molecular Biology. 80 (2): 231–8. doi:10.1016/S0960-0760(01)00190-X. PMID11897506. S2CID34995614.
Di Fiore PP, Scita G (October 2002). "Eps8 in the midst of GTPases". The International Journal of Biochemistry & Cell Biology. 34 (10): 1178–83. doi:10.1016/S1357-2725(02)00064-X. PMID12127568.
Kari C, Chan TO, Rocha de Quadros M, Rodeck U (January 2003). "Targeting the epidermal growth factor receptor in cancer: apoptosis takes center stage". Cancer Research. 63 (1): 1–5. PMID12517767.
Bonaccorsi L, Muratori M, Carloni V, Zecchi S, Formigli L, Forti G, Baldi E (February 2003). "Androgen receptor and prostate cancer invasion". International Journal of Andrology. 26 (1): 21–5. doi:10.1046/j.1365-2605.2003.00375.x. hdl:2158/252370. PMID12534934.
Adams TE, McKern NM, Ward CW (June 2004). "Signalling by the type 1 insulin-like growth factor receptor: interplay with the epidermal growth factor receptor". Growth Factors. 22 (2): 89–95. doi:10.1080/08977190410001700998. PMID15253384. S2CID86844427.
Ferguson KM (November 2004). "Active and inactive conformations of the epidermal growth factor receptor". Biochemical Society Transactions. 32 (Pt 5): 742–5. doi:10.1042/BST0320742. PMID15494003.
Carlsson J, Ren ZP, Wester K, Sundberg AL, Heldin NE, Hesselager G, Persson M, Gedda L, Tolmachev V, Lundqvist H, Blomquist E, Nistér M (March 2006). "Planning for intracavitary anti-EGFR radionuclide therapy of gliomas. Literature review and data on EGFR expression". Journal of Neuro-Oncology. 77 (1): 33–45. doi:10.1007/s11060-005-7410-z. PMID16200342. S2CID42293693.
Scartozzi M, Pierantoni C, Berardi R, Antognoli S, Bearzi I, Cascinu S (April 2006). "Epidermal growth factor receptor: a promising therapeutic target for colorectal cancer". Analytical and Quantitative Cytology and Histology. 28 (2): 61–8. PMID16637508.
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