Tropomyosin receptor kinase C
Tropomyosin receptor kinase C (TrkC),[5] also known as NT-3 growth factor receptor, neurotrophic tyrosine kinase receptor type 3, or TrkC tyrosine kinase is a protein that in humans is encoded by the NTRK3 gene.[6]
TrkC is the high affinity catalytic receptor for the neurotrophin NT-3 (neurotrophin-3). As such, TrkC mediates the multiple effects of this neurotrophic factor, which includes neuronal differentiation and survival.
The TrkC receptor is part of the large family of receptor tyrosine kinases. A "tyrosine kinase" is an enzyme which is capable of adding a phosphate group to the certain tyrosines on target proteins, or "substrates". A receptor tyrosine kinase is a "tyrosine kinase" which is located at the cellular membrane, and is activated by binding of a ligand via its extracellular domain. Other example of tyrosine kinase receptors include the insulin receptor, the IGF-1 receptor, the MuSK protein receptor, the vascular endothelial growth factor (VEGF) receptor, etc. The "substrate" proteins which are phosphorylated by TrkC include PI3 kinase.
Function
TrkC is the high affinity catalytic receptor for the neurotrophin-3 (also known as NTF3 or NT-3). Similar to other NTRK receptors and receptor tyrosine kinases in general, ligand binding induces receptor dimerization followed by trans-autophosphorylation on conserved tyrosine in the intracellular (cytoplasmic) domain of the receptor. These conserved tyrosine serve as docking sites for adaptor proteins that trigger downstream signaling cascades. Signaling through PLCG1, PI3K and RAAS, downstream of activated NTRK3, regulates cell survival, proliferation and motility[7]
Moreover, TrkC has been identified as a novel synaptogenic adhesion molecule responsible for excitatory synapse development.[8]
The TrkC locus encodes at least eight isoforms including forms without the kinase domain or with kinase insertions adjacent to the major autophosphorylation site. These forms arise by alternative splicing events and are expressed in different tissues and cell types.[9] NT-3 activation of catalytic TrkC isoform promotes both proliferation of neural crest cells and neuronal differentiation. On the other hand, the binding of NT-3 to the non-catalytic TrkC isoform induces neuronal differentiation, but nor neuronal proliferation[10]
Family members
Tropomyosin receptor kinases, also known as neurotrophic tyrosine kinase receptors (Trk) play an essential role in the biology of neurons by mediating Neurotrophin-activated signaling. There are three transmembrane receptors TrkA, TrkB and TrkC (encoded by the genes NTRK1, NTRK2 and NTRK3 respectively) make up the Trk receptor family.[11] This family of receptors are all activated by neurotrophins, including NGF (for Nerve Growth Factor), BDNF (for Brain Derived Neurotrophic Factor), NT-4 (for Neurotrophin-4) and NT-3 (for Neurotrophin-3). While TrkA mediated the effects of NGF, TrkB is bound and activated by BDNF, NT-4 and NT-3. Further, TrkC binds and is activated by NT-3.[12] TrkB binds BDNF and NT-4 more strongly than it binds NT-3. TrkC binds NT-3 more strongly than TrkB does.
There is one other NT-3 receptor family besides the Trks (TrkC & TrkB), called the "LNGFR" (for "low affinity nerve growth factor receptor"). As opposed to TrkC, the LNGFR plays a somewhat less clear role in NT-3 biology. Some researchers have shown the LNGFR binds and serves as a "sink" for neurotrophins. Cells which express both the LNGFR and the Trk receptors might therefore have a greater activity - since they have a higher "microconcentration" of the neurotrophin. It has also been shown, however, that the LNGFR may signal a cell to die via apoptosis - so therefore cells expressing the LNGFR in the absence of Trk receptors may die rather than live in the presence of a neurotrophin.
It has been demonstrated that NTRK3 is a dependence receptor, meaning that it can be capable of inducing proliferation when it binds to its ligand NT-3, however, the absence of the NT-3 will result in the induction of apoptosis by NTRK3.[13]
Role in disease
With the past of the years, lot of studies have shown that the lack or deregulation of TrkC or the complex TrkC:NT-3 can be associated with different diseases.
One study have demonstrated that mice defective for either NT-3 or TrkC display severe sensory defects. These mice have normal nociception, but they are defective in proprioception, the sensory activity responsible for localizing the limbs in space.[14]
The reduction of TrkC expression has been observed in neurodegenerative diseases, including Alzheimer's (AD), Parkinson's (PD), and Huntington's diseases (HD).[15] The role of NT-3 was also therapeutically studied in models of amyotrophic lateral sclerosis (ALS) with loss of spinal cord motor neurons that express TrkC[16]
Moreover, it has been shown that TrkC plays a role in cancer. The expression and function of Trk subtypes are dependent on the tumor type. For example, in neuroblastoma, TrkC expression correlates with a good prognosis, but in breast, prostate and pancreatic cancers, the expression of the same TrkC subtype is associated with cancer progression and metastasis.[17]
Role in cancer
Although originally identified as an oncogenic fusion in 1982,[18] only recently has there been a renewed interest in the Trk family as it relates to its role in human cancers because of the identification of NTRK1 (TrkA), NTRK2 (TrkB) and NTRK3 (TrkC) gene fusions and other oncogenic alterations in a number of tumor types. A number of Trk inhibitors are (in 2015) in clinical trials and have shown early promise in shrinking human tumors.[19] Family of neurotrophin receptors including NTRK3 have been shown to induce a variety of pleiotorpic response in malignant cells, including enhanced tumor cell invasiveness and chemotoxis.[20] Increased NTRK3 expression has been demonstrated in neuroblastoma,[21] in medulloblastoma,[22] and in neuroectodermal brain tumors.[23]
NTRK3 methylation
The promoter region of NTRK3 contains a dense CpG island located relatively adjacent to the transcription start site (TSS). Using HumanMethylation450 arrays, quantitative methylation-specific PCR (qMSP), and Methylight assays, it has been indicated that NTRK3 is methylated in all CRC cell lines and non of the normal epithelium samples. In light of its preferential methylation in CRCs and because of its role as a neurotrophin receptor, it has been suggested to have a functional role in colorectal cancer formation.[24] It has also been suggested that methylation status of NTRK3 promoter is capable of discriminating CRC tumor samples from normal adjacent tumor-free tissue. Hence it can be considered as a biomarker for molecular detection of CRC, specially in combination with other markers like SEPT9.[25] NTRK3 has also been indicated as one of the genes in the panel of nine CpG methylation probes located at promoter or exon 1 region of eight genes (including DDIT3, FES, FLT3, SEPT5, SEPT9, SOX1, SOX17, and NTRK3) for prognostic prediction in ESCC (esophageal squamous cell carcinoma) patients.[26]
TrkC (NTRK3 gene) inhibitors in development
Entrectinib (formerly RXDX-101) is an investigational drug developed by Ignyta, Inc., which has potential antitumor activity. It is an oral pan-TRK, ALK and ROS1 inhibitor that has demonstrated its anti tumor activity in murine, human tumor cell lines, and patient-derived xenograft tumor models. In vitro, entrectinib inhibits the Trk family members TrkA, TrkB and TrkC at low nano molar concentrations. It is highly bound to plasma proteins (99,5%), and can readily diffuse across the blood-brain barrier (BBB).[27]
Entrectinib has been approved by the FDA on August 15, 2019 for the treatment of adult and pediatric patients 12 years of age and older with solid tumors that have a neurotrophic tyrosine kinase receptor gene fusion[28]
Interactions
TrkC has been shown to interact with:
- SH2B2
- SQSTM1
- KIDINS220
- PTPRS[29]
- MAPK8IP3/JIP3
- Neurotrophin-3[30][31][32][33][34]
- TβRII[35]
- DOK5[36]
- BMPRII[37]
- PLCG1[38][39]
Ligands
Small molecules peptidomimetics based on β-turn NT-3, with the rationale of targeting the extracellular domain of the TrkC receptor have shown to be agonist of TrkC.[40] Posterior studies, have shown that peptidomimetics with an organic backbone, and a pharmacophore based on β-turn NT-3 structure can also function as an antagonist of TrkC.[41]
References
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Another common feature of neurotrophins is that they produce their physiologic effects by means of the tropomyosin receptor kinase (Trk) receptor family (also known as the tyrosine receptor kinase family). ... Try receptors. All neurotrophins bind to a class of highly homologous receptor tyrosine kinases known as Trk receptors, of which three types are known: TrkA, TrkB, and TrkC. These transmembrane receptors are glycoproteins whose molecular masses range from 140 to 145 kDa. Each type of Trk receptor tends to bind specific neurotrophins: TrkA is the receptor for NGF, TrkB the receptor for BDNF and NT-4, and TrkC the receptor for NT-3.However, some overlap in the specificity of these receptors has been noted.
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Further reading
- Lamballe F, Klein R, Barbacid M (September 1991). "trkC, a new member of the trk family of tyrosine protein kinases, is a receptor for neurotrophin-3". Cell. 66 (5): 967–79. doi:10.1016/0092-8674(91)90442-2. PMID 1653651. S2CID 23448391.
- Tessarollo L, Tsoulfas P, Martin-Zanca D, Gilbert DJ, Jenkins NA, Copeland NG, et al. (June 1993). "trkC, a receptor for neurotrophin-3, is widely expressed in the developing nervous system and in non-neuronal tissues". Development. 118 (2): 463–75. doi:10.1242/dev.118.2.463. PMID 8223273.
- Klein R, Silos-Santiago I, Smeyne RJ, Lira SA, Brambilla R, Bryant S, et al. (March 1994). "Disruption of the neurotrophin-3 receptor gene trkC eliminates la muscle afferents and results in abnormal movements". Nature. 368 (6468): 249–51. Bibcode:1994Natur.368..249K. doi:10.1038/368249a0. PMID 8145824. S2CID 4328770.
- Ip NY, Stitt TN, Tapley P, Klein R, Glass DJ, Fandl J, et al. (February 1993). "Similarities and differences in the way neurotrophins interact with the Trk receptors in neuronal and nonneuronal cells". Neuron. 10 (2): 137–49. doi:10.1016/0896-6273(93)90306-C. PMID 7679912. S2CID 46072027.
- Ebendal T (August 1992). "Function and evolution in the NGF family and its receptors". Journal of Neuroscience Research. 32 (4): 461–70. doi:10.1002/jnr.490320402. PMID 1326636. S2CID 24492932.
- Guiton M, Gunn-Moore FJ, Glass DJ, Geis DR, Yancopoulos GD, Tavaré JM (September 1995). "Naturally occurring tyrosine kinase inserts block high affinity binding of phospholipase C gamma and Shc to TrkC and neurotrophin-3 signaling". The Journal of Biological Chemistry. 270 (35): 20384–90. doi:10.1074/jbc.270.35.20384. PMID 7657612.
- Shelton DL, Sutherland J, Gripp J, Camerato T, Armanini MP, Phillips HS, et al. (January 1995). "Human trks: molecular cloning, tissue distribution, and expression of extracellular domain immunoadhesins". The Journal of Neuroscience. 15 (1 Pt 2): 477–91. doi:10.1523/JNEUROSCI.15-01-00477.1995. PMC 6578290. PMID 7823156.
- Pflug BR, Dionne C, Kaplan DR, Lynch J, Djakiew D (January 1995). "Expression of a Trk high affinity nerve growth factor receptor in the human prostate". Endocrinology. 136 (1): 262–8. doi:10.1210/endo.136.1.7828539. PMID 7828539.
- Lamballe F, Tapley P, Barbacid M (August 1993). "trkC encodes multiple neurotrophin-3 receptors with distinct biological properties and substrate specificities". The EMBO Journal. 12 (8): 3083–94. doi:10.1002/j.1460-2075.1993.tb05977.x. PMC 413573. PMID 8344249.
- Andersson B, Wentland MA, Ricafrente JY, Liu W, Gibbs RA (April 1996). "A "double adaptor" method for improved shotgun library construction". Analytical Biochemistry. 236 (1): 107–13. doi:10.1006/abio.1996.0138. PMID 8619474.
- Yamamoto M, Sobue G, Yamamoto K, Terao S, Mitsuma T (August 1996). "Expression of mRNAs for neurotrophic factors (NGF, BDNF, NT-3, and GDNF) and their receptors (p75NGFR, trkA, trkB, and trkC) in the adult human peripheral nervous system and nonneural tissues". Neurochemical Research. 21 (8): 929–38. doi:10.1007/BF02532343. PMID 8895847. S2CID 20559271.
- Yu W, Andersson B, Worley KC, Muzny DM, Ding Y, Liu W, et al. (April 1997). "Large-scale concatenation cDNA sequencing". Genome Research. 7 (4): 353–8. doi:10.1101/gr.7.4.353. PMC 139146. PMID 9110174.
- Valent A, Danglot G, Bernheim A (1997). "Mapping of the tyrosine kinase receptors trkA (NTRK1), trkB (NTRK2) and trkC(NTRK3) to human chromosomes 1q22, 9q22 and 15q25 by fluorescence in situ hybridization". European Journal of Human Genetics. 5 (2): 102–4. doi:10.1159/000484742. PMID 9195161.
- Terenghi G, Mann D, Kopelman PG, Anand P (May 1997). "trkA and trkC expression is increased in human diabetic skin". Neuroscience Letters. 228 (1): 33–6. doi:10.1016/S0304-3940(97)00350-9. PMID 9197281. S2CID 30847717.
- Knezevich SR, McFadden DE, Tao W, Lim JF, Sorensen PH (February 1998). "A novel ETV6-NTRK3 gene fusion in congenital fibrosarcoma". Nature Genetics. 18 (2): 184–7. doi:10.1038/ng0298-184. PMID 9462753. S2CID 7390311.
- Urfer R, Tsoulfas P, O'Connell L, Hongo JA, Zhao W, Presta LG (March 1998). "High resolution mapping of the binding site of TrkA for nerve growth factor and TrkC for neurotrophin-3 on the second immunoglobulin-like domain of the Trk receptors". The Journal of Biological Chemistry. 273 (10): 5829–40. doi:10.1074/jbc.273.10.5829. PMID 9488719.
- Hu YQ, Koo PH (July 1998). "Inhibition of phosphorylation of TrkB and TrkC and their signal transduction by alpha2-macroglobulin". Journal of Neurochemistry. 71 (1): 213–20. doi:10.1046/j.1471-4159.1998.71010213.x. PMID 9648868. S2CID 24946628.
- Ichaso N, Rodriguez RE, Martin-Zanca D, Gonzalez-Sarmiento R (October 1998). "Genomic characterization of the human trkC gene". Oncogene. 17 (14): 1871–5. doi:10.1038/sj.onc.1202100. PMID 9778053.
- Qian X, Riccio A, Zhang Y, Ginty DD (November 1998). "Identification and characterization of novel substrates of Trk receptors in developing neurons". Neuron. 21 (5): 1017–29. doi:10.1016/S0896-6273(00)80620-0. PMID 9856458.
- Bibel M, Hoppe E, Barde YA (February 1999). "Biochemical and functional interactions between the neurotrophin receptors trk and p75NTR". The EMBO Journal. 18 (3): 616–22. doi:10.1093/emboj/18.3.616. PMC 1171154. PMID 9927421.
- Labouyrie E, Dubus P, Groppi A, Mahon FX, Ferrer J, Parrens M, et al. (February 1999). "Expression of neurotrophins and their receptors in human bone marrow". The American Journal of Pathology. 154 (2): 405–15. doi:10.1016/s0002-9440(10)65287-x. PMC 1849993. PMID 10027399.