Hepatocyte growth factor receptor (HGF receptor) [5] [6] is a protein that in humans is encoded by the MET gene. The protein possesses tyrosine kinase activity. [7] The primary single chain precursor protein is post-translationally cleaved to produce the alpha and beta subunits, which are disulfide linked to form the mature receptor.
HGF receptor is a single pass tyrosine kinase receptor essential for embryonic development, organogenesis and wound healing. Hepatocyte growth factor/Scatter Factor (HGF/SF) and its splicing isoform (NK1, NK2) are the only known ligands of the HGF receptor. MET is normally expressed by cells of epithelial origin, while expression of HGF/SF is restricted to cells of mesenchymal origin. When HGF/SF binds its cognate receptor MET it induces its dimerization through a not yet completely understood mechanism leading to its activation.
Abnormal MET activation in cancer correlates with poor prognosis, where aberrantly active MET triggers tumor growth, formation of new blood vessels (angiogenesis) that supply the tumor with nutrients, and cancer spread to other organs (metastasis). MET is deregulated in many types of human malignancies, including cancers of kidney, liver, stomach, breast, and brain. Normally, only stem cells and progenitor cells express MET, which allows these cells to grow invasively in order to generate new tissues in an embryo or regenerate damaged tissues in an adult. However, cancer stem cells are thought to hijack the ability of normal stem cells to express MET, and thus become the cause of cancer persistence and spread to other sites in the body. Both the overexpression of Met/HGFR, as well as its autocrine activation by co-expression of its hepatocyte growth factor ligand, have been implicated in oncogenesis. [8] [9]
Various mutations in the MET gene are associated with papillary renal carcinoma. [10]
MET proto-oncogene (GeneID: 4233) has a total length of 125,982 bp, and it is located in the 7q31 locus of chromosome 7. [11] MET is transcribed into a 6,641 bp mature mRNA, which is then translated into a 1,390 amino-acid MET protein.
MET is a receptor tyrosine kinase (RTK) that is produced as a single-chain precursor. The precursor is proteolytically cleaved at a furin site to yield a highly glycosylated extracellular α-subunit and a transmembrane β-subunit, which are linked together by a disulfide bridge. [12]
A juxtamembrane segment that contains:
MET activation by its ligand HGF induces MET kinase catalytic activity, which triggers transphosphorylation of the tyrosines Tyr 1234 and Tyr 1235. These two tyrosines engage various signal transducers, [17] thus initiating a whole spectrum of biological activities driven by MET, collectively known as the invasive growth program. The transducers interact with the intracellular multisubstrate docking site of MET either directly, such as GRB2, SHC, [18] SRC, and the p85 regulatory subunit of phosphatidylinositol-3 kinase (PI3K), [18] or indirectly through the scaffolding protein Gab1 [19]
Tyr 1349 and Tyr 1356 of the multisubstrate docking site are both involved in the interaction with GAB1, SRC, and SHC, while only Tyr 1356 is involved in the recruitment of GRB2, phospholipase C γ (PLC-γ), p85, and SHP2. [20]
GAB1 is a key coordinator of the cellular responses to MET and binds the MET intracellular region with high avidity, but low affinity. [21] Upon interaction with MET, GAB1 becomes phosphorylated on several tyrosine residues which, in turn, recruit a number of signalling effectors, including PI3K, SHP2, and PLC-γ. GAB1 phosphorylation by MET results in a sustained signal that mediates most of the downstream signaling pathways. [22]
MET engagement activates multiple signal transduction pathways:
MET mediates a complex program known as invasive growth. [26] Activation of MET triggers mitogenesis, and morphogenesis. [31] [32]
During embryonic development, transformation of the flat, two-layer germinal disc into a three-dimensional body depends on transition of some cells from an epithelial phenotype to spindle-shaped cells with motile behaviour, a mesenchymal phenotype. This process is referred to as epithelial-mesenchymal transition (EMT). [33] Later in embryonic development, MET is crucial for gastrulation, angiogenesis, myoblast migration, bone remodeling, and nerve sprouting among others. [34] MET is essential for embryogenesis, because MET−/− mice die in utero due to severe defects in placental development. [35] Along with Ectodysplasin A, it has been shown to be involved in the differentiation of anatomical placodes, precursors of scales, feathers and hair follicles in vertebrates. [36] Furthermore, MET is required for such critical processes as liver regeneration and wound healing during adulthood. [26]
HGF/MET axis is also involved in myocardial development. Both HGF and MET receptor mRNAs are co-expressed in cardiomyocytes from E7.5, soon after the heart has been determined, to E9.5. Transcripts for HGF ligand and receptor are first detected before the occurrence of cardiac beating and looping, and persist throughout the looping stage, when heart morphology begins to elaborate. [37] In avian studies, HGF was found in the myocardial layer of the atrioventricular canal, in a developmental stage in which the epithelial to mesenchymal transformation (EMT) of the endocardial cushion occurs. [38] However, MET is not essential for heart development, since α-MHCMet-KO mice show normal heart development. [39]
MET is normally expressed by epithelial cells. [26] However, MET is also found on endothelial cells, neurons, hepatocytes, hematopoietic cells, melanocytes and neonatal cardiomyocytes. [32] [40] HGF expression is restricted to cells of mesenchymal origin. [33]
MET transcription is activated by HGF and several growth factors. [41] MET promoter has four putative binding sites for Ets, a family of transcription factors that control several invasive growth genes. [41] ETS1 activates MET transcription in vitro. [42] MET transcription is activated by hypoxia-inducible factor 1 (HIF1), which is activated by low concentration of intracellular oxygen. [43] HIF1 can bind to one of the several hypoxia response elements (HREs) in the MET promoter. [33] Hypoxia also activates transcription factor AP-1, which is involved in MET transcription. [33]
MET pathway plays an important role in the development of cancer through:
Coordinated down-regulation of both MET and its downstream effector extracellular signal-regulated kinase 2 (ERK2) by miR-199a* may be effective in inhibiting not only cell proliferation but also motility and invasive capabilities of tumor cells. [45]
MET amplification has emerged as a potential biomarker of the clear cell tumor subtype. [46]
The amplification of the cell surface receptor MET often drives resistance to anti-EGFR therapies in colorectal cancer. [47]
The SFARIgene database lists MET with an autism score of 2.0, which indicates that it is a strong candidate for playing a role in cases of autism. The database also identifies at least one study that found a role for MET in cases of schizophrenia. The gene was first implicated in autism in a study that identified a polymorphism in the promoter of the MET gene. [48] The polymorphism reduces transcription by 50%. Further, the variant as an autism risk polymorphism has been replicated, and shown to be enriched in children with autism and gastrointestinal disturbances. [49] A rare mutation has been found that appears in two family members, one with autism and the other with a social and communication disorder. [50] The role of the receptor in brain development is distinct from its role in other developmental processes. Activation of the MET receptor regulates synapse formation [51] [52] [53] [54] [55] and can impact the development and function of circuits involved in social and emotional behavior. [56]
In adult mice, MET is required to protect cardiomyocytes by preventing age-related oxidative stress, apoptosis, fibrosis and cardiac dysfunction. [39] Moreover, MET inhibitors, such as crizotinib or PF-04254644, have been tested by short-term treatments in cellular and preclinical models, and have been shown to induce cardiomyocytes death through ROS production, activation of caspases, metabolism alteration and blockage of ion channels. [57] [58]
In the injured heart, HGF/MET axis plays important roles in cardioprotection by promoting pro-survival (anti-apoptotic and anti-autophagic) effects in cardiomyocytes, angiogenesis, inhibition of fibrosis, anti-inflammatory and immunomodulatory signals, and regeneration through activation of cardiac stem cells. [59] [60]
PTEN (phosphatase and tensin homolog) is a tumor suppressor gene encoding a protein PTEN, which possesses lipid and protein phosphatase-dependent as well as phosphatase-independent activities. [61] PTEN protein phosphatase is able to interfere with MET signaling by dephosphorylating either PIP3 generated by PI3K, or the p52 isoform of SHC. SHC dephosphorylation inhibits recruitment of the GRB2 adapter to activated MET. [29]
There is evidence of correlation between inactivation of VHL tumor suppressor gene and increased MET signaling in renal cell carcinoma (RCC) and also in malignant transformations of the heart. [62] [63]
Since tumor invasion and metastasis are the main cause of death in cancer patients, interfering with MET signaling appears to be a promising therapeutic approach. A comprehensive list of HGF and MET targeted experimental therapeutics for oncology now in human clinical trials can be found here.
Kinase inhibitors are low molecular weight molecules that prevent ATP binding to MET, thus inhibiting receptor transphosphorylation and recruitment of the downstream effectors. The limitations of kinase inhibitors include the facts that they only inhibit kinase-dependent MET activation, and that none of them is fully specific for MET.
Since HGF is the only known ligand of MET, blocking the formation of a HGF:MET complex blocks MET biological activity. For this purpose, truncated HGF, anti-HGF neutralizing antibodies, and an uncleavable form of HGF have been utilized so far. The major limitation of HGF inhibitors is that they block only HGF-dependent MET activation.
Decoy MET refers to a soluble truncated MET receptor. Decoys are able to inhibit MET activation mediated by both HGF-dependent and independent mechanisms, as decoys prevent both the ligand binding and the MET receptor homodimerization. CGEN241 (Compugen) is a decoy MET that is highly efficient in inhibiting tumor growth and preventing metastasis in animal models. [73]
Drugs used for immunotherapy can act either passively by enhancing the immunologic response to MET-expressing tumor cells, or actively by stimulating immune cells and altering differentiation/growth of tumor cells. [74]
Administering monoclonal antibodies (mAbs) is a form of passive immunotherapy. MAbs facilitate destruction of tumor cells by complement-dependent cytotoxicity (CDC) and cell-mediated cytotoxicity (ADCC). In CDC, mAbs bind to specific antigen, leading to activation of the complement cascade, which in turn leads to formation of pores in tumor cells. In ADCC, the Fab domain of a mAb binds to a tumor antigen, and Fc domain binds to Fc receptors present on effector cells (phagocytes and NK cells), thus forming a bridge between an effector and a target cells. This induces the effector cell activation, leading to phagocytosis of the tumor cell by neutrophils and macrophages. Furthermore, NK cells release cytotoxic molecules, which lyse tumor cells. [74]
Active immunotherapy to MET-expressing tumors can be achieved by administering cytokines, such as interferons (IFNs) and interleukins (IL-2), which triggers non-specific stimulation of numerous immune cells. IFNs have been tested as therapies for many types of cancers and have demonstrated therapeutic benefits. IL-2 has been approved by the U.S. Food and Drug Administration (FDA) for the treatment of renal cell carcinoma and metastatic melanoma, which often have deregulated MET activity. [74]
Met has been shown to interact with:
A tyrosine kinase is an enzyme that can transfer a phosphate group from ATP to the tyrosine residues of specific proteins inside a cell. It functions as an "on" or "off" switch in many cellular functions.
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Tropomyosin receptor kinase A (TrkA), also known as high affinity nerve growth factor receptor, neurotrophic tyrosine kinase receptor type 1, or TRK1-transforming tyrosine kinase protein is a protein that in humans is encoded by the NTRK1 gene.
Receptor tyrosine kinases (RTKs) are the high-affinity cell surface receptors for many polypeptide growth factors, cytokines, and hormones. Of the 90 unique tyrosine kinase genes identified in the human genome, 58 encode receptor tyrosine kinase proteins. Receptor tyrosine kinases have been shown not only to be key regulators of normal cellular processes but also to have a critical role in the development and progression of many types of cancer. Mutations in receptor tyrosine kinases lead to activation of a series of signalling cascades which have numerous effects on protein expression. The receptors are generally activated by dimerization and substrate presentation. Receptor tyrosine kinases are part of the larger family of protein tyrosine kinases, encompassing the receptor tyrosine kinase proteins which contain a transmembrane domain, as well as the non-receptor tyrosine kinases which do not possess transmembrane domains.
Growth factor receptor-bound protein 2, also known as Grb2, is an adaptor protein involved in signal transduction/cell communication. In humans, the GRB2 protein is encoded by the GRB2 gene.
Hepatocyte growth factor (HGF) or scatter factor (SF) is a paracrine cellular growth, motility and morphogenic factor. It is secreted by mesenchymal cells and targets and acts primarily upon epithelial cells and endothelial cells, but also acts on haemopoietic progenitor cells and T cells. It has been shown to have a major role in embryonic organ development, specifically in myogenesis, in adult organ regeneration, and in wound healing.
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Cbl is a mammalian gene family. CBL gene, a part of the Cbl family, encodes the protein CBL which is an E3 ubiquitin-protein ligase involved in cell signalling and protein ubiquitination. Mutations to this gene have been implicated in a number of human cancers, particularly acute myeloid leukaemia.
Receptor tyrosine-protein kinase erbB-3, also known as HER3, is a membrane bound protein that in humans is encoded by the ERBB3 gene.
GRB2-associated-binding protein 1 is a protein that in humans is encoded by the GAB1 gene.
Sprouty homolog 2 (Drosophila), also known as SPRY2, is a protein which in humans is encoded by the SPRY2 gene.
Proto-oncogene tyrosine-protein kinase Src, also known as proto-oncogene c-Src, or simply c-Src, is a non-receptor tyrosine kinase protein that in humans is encoded by the SRC gene. It belongs to a family of Src family kinases and is similar to the v-Src gene of Rous sarcoma virus. It includes an SH2 domain, an SH3 domain and a tyrosine kinase domain. Two transcript variants encoding the same protein have been found for this gene.
Tyrosine-protein kinase receptor UFO is a protein that in human is encoded by the AXL gene. The gene was initially designated as UFO, in allusion to the unidentified function of this protein. However, in the years since its discovery, research into AXL's expression profile and mechanism has made it an increasingly attractive target, especially for cancer therapeutics. In recent years, AXL has emerged as a key facilitator of immune escape and drug-resistance by cancer cells, leading to aggressive and metastatic cancers.
Macrophage-stimulating protein receptor is a protein that in humans is encoded by the MST1R gene. MST1R is also known as RON kinase, named after the French city in which it was discovered. It is related to the c-MET receptor tyrosine kinase.
Proto-oncogene tyrosine-protein kinase ROS is an enzyme that in humans is encoded by the ROS1 gene.
Src kinase family is a family of non-receptor tyrosine kinases that includes nine members: Src, Yes, Fyn, and Fgr, forming the SrcA subfamily, Lck, Hck, Blk, and Lyn in the SrcB subfamily, and Frk in its own subfamily. Frk has homologs in invertebrates such as flies and worms, and Src homologs exist in organisms as diverse as unicellular choanoflagellates, but the SrcA and SrcB subfamilies are specific to vertebrates. Src family kinases contain six conserved domains: a N-terminal myristoylated segment, a SH2 domain, a SH3 domain, a linker region, a tyrosine kinase domain, and C-terminal tail.
c-Met inhibitors are a class of small molecules that inhibit the enzymatic activity of the c-Met tyrosine kinase, the receptor of hepatocyte growth factor/scatter factor (HGF/SF). These inhibitors may have therapeutic application in the treatment of various types of cancers.
George K. Michalopoulos is a Greek-American pathologist and academic. He served as Maud L. Menten Professor of Experimental Pathology and Chair of the Department of Pathology at the University of Pittsburgh and UPMC from 1991 to 2023.