NTRK1
Available structures
PDBOrtholog search: PDBe RCSB
Identifiers
AliasesNTRK1, MTC, TRK, TRK1, TRKA, Trk-A, p140-TrkA, neurotrophic receptor tyrosine kinase 1
External IDsOMIM: 191315 MGI: 97383 HomoloGene: 1898 GeneCards: NTRK1
Orthologs
SpeciesHumanMouse
Entrez

4914

18211

Ensembl

ENSG00000198400

ENSMUSG00000028072

UniProt

P04629

Q3UFB7

RefSeq (mRNA)

NM_002529
NM_001007792
NM_001012331

NM_001033124

RefSeq (protein)

NP_001007793
NP_001012331
NP_002520

NP_001028296

Location (UCSC)Chr 1: 156.82 – 156.88 MbChr 3: 87.69 – 87.7 Mb
PubMed search[3][4]
Wikidata
View/Edit HumanView/Edit Mouse

Tropomyosin receptor kinase A (TrkA),[5] 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.[6]

This gene encodes a member of the neurotrophic tyrosine kinase receptor (NTKR) family. This kinase is a membrane-bound receptor that, upon neurotrophin binding, phosphorylates itself (autophosphorylation) and members of the MAPK pathway. The presence of this kinase leads to cell differentiation and may play a role in specifying sensory neuron subtypes. Mutations in this gene have been associated with congenital insensitivity to pain with anhidrosis, self-mutilating behaviors, intellectual disability and/or cognitive impairment and certain cancers. Alternate transcriptional splice variants of this gene have been found, but only three have been characterized to date.[7]

Function and Interaction with NGF

TrkA is the high affinity catalytic receptor for the neurotrophin, Nerve Growth Factor, or "NGF". As a kinase, TrkA mediates the multiple effects of NGF, which include neuronal differentiation, neural proliferation, nociceptor response, and avoidance of programmed cell death.[8]

The binding of NGF to TrkA leads to a ligand-induced dimerization, and a proposed mechanism by which this receptor and ligand interact is that two TrkA receptors associate with a single NGF ligand.[9] This interaction leads to a cross linking dimeric complex where parts of the ligand-binding domains on TrkA are associated with their respective ligands.[9] TrkA has five binding domains on its extracellular portion, and the domain TrkA-d5 folds into an immunoglobulin-like domain which is critical and adequate for the binding of NGF.[10] After being immediately bound by NGF, the NGF/TrkA complex is brought from the synapse to the cell body through endocytosis where it then activates the NGF-dependent transcriptional program.[9] Upon activation, the tyrosine residues are phosphorylated within the cytoplasmic domain of TrkA, and these residues then recruit signaling molecules, following several pathways that lead to the differentiation and survival of neurons.[11] Two pathways that this complex acts to promote growth is through the Ras/MAPK pathway and the PI3K/Akt pathway.[9]

Family members

The three transmembrane receptors TrkA, TrkB, and TrkC (encoded by the genes NTRK1, NTRK2, and NTRK3 respectively) make up the Trk receptor family.[12] This family of receptors are all activated by protein nerve growth factors, or neurotrophins. Also, there are other neurotrophic factors structurally related to NGF: BDNF (for Brain-Derived Neurotrophic Factor), NT-3 (for Neurotrophin-3) and NT-4 (for Neurotrophin-4). While TrkA mediates 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.[13] In one study, the Trk gene was removed from embryonic mice stem cells which led to severe neurological disease, causing most mice to die one month after birth.[14] Thus, Trk is the mediator of developmental and growth processes of NGF, and plays a critical role in the development of the nervous system in many organisms.

There is one other NGF receptor besides TrkA, called the "LNGFR" (for "Low-affinity nerve growth factor receptor "). As opposed to TrkA, the LNGFR plays a somewhat less clear role in NGF 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 in the absence of a co-expressed TrkA, 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.

Role in disease

There are several studies that highlight TrkA's role in various diseases.[15] In one study conducted on two rat models, an inhibition of TrkA with AR786 led to a reduction in joint swelling, joint damage, and pain caused by inflammatory arthritis.[15] Thus, blocking the binding of NGF allows for the alleviation of side effects from inherited arthritis, potentially highlighting a model to aid human inflammatory arthritis.[15]

In one study done on patients with functional dyspepsia, scientists found a significant increase in TrkA and nerve growth factor in gastric mucosa.[16] The increase of TrkA and nerve growth factor is linked to indigestion and gastric symptoms in patients, thus this increase may be linked with the development of functional dyspepsia.[16]

In one study, a total absence of TrkA receptor was found in keratoconus-affected corneas, along with an increased level of repressor isoform of Sp3 transcription factor.[17]

Gene fusions involving NTRK1 have been shown to be oncogenic, leading to the constitutive TrkA activation.[18] In a research study by Vaishnavi A. et al., NTRK1 fusions are estimated to occur in 3.3% of lung cancer as assessed through next generation sequencing or fluorescence in situ hybridization.[18]

While in some contexts, Trk A is oncogenic, in other contexts TrkA has the ability to induced terminal differentiation in cancer cells, halting cellular division. In some cancers, like neuroblastoma, TrkA is seen as a good prognostic marker as it is linked to spontaneous tumor regression.[19]

Regulation

The levels of distinct proteins can be regulated by the "ubiquitin/proteasome" system. In this system, a small (7–8 kd)protein called "ubiquitin" is affixed to a target protein, and is thereby targeted for destruction by a structure called the "proteasome". TrkA is targeted for proteasome-mediated destruction by an "E3 ubiquitin ligase" called NEDD4-2.[20] This mechanism may be a distinct way to control the survival of a neuron. The extent and maybe type of TrkA ubiquitination can be regulated by the other, unrelated receptor for NGF, p75NTR.

Interactions

TrkA has been shown to interact with:

Ligands

TRKA receptor domain 5 (purple) bound to NGF (red)

Small molecules such as amitriptyline and gambogic acid derivatives have been claimed to activate TrkA. Amitriptyline activates TrkA and facilitates the heterodimerization of TrkA and TrkB in the absence of NGF. Binding of amitriptyline to TrkA occurs to the Leucine Rich Region (LRR) of the extracellular domain of the receptor, which is distinct from the NGF binding site. Amitryptiline possesses neurotrophic activity both in-vitro and in-vivo (mouse model).[37] Gambogic amide, a derivative of gambogic acid, selectively activates TrkA (but not TrkB and TrkC) both in-vitro and in-vivo by interacting with the cytoplasmic juxtamembrane domain of TrkA.[38]

Role in cancer

TrkA has a dual role in cancer. TrkA was originally cloned from a colon tumor; the cancer occurred via a translocation, which resulted in the activation of the TrkA kinase domain. Although originally identified as an oncogenic fusion in 1982,[39] 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. The mechanism of activation of the Human Trk oncogene is suspected to involve a folding of its kinase domain, leading the receptor to remain constitutively active.[40] In contrast, Trk A also has the potential to induce differentiation and spontaneous regression of cancer in infants.[19]

Inhibitors in development

There are several Trk inhibitors that have been FDA approved, and have been clinically seen to counteract the effects of Trk over-expression by acting as a Trk inhibitor.[41]

Entrectinib (formerly RXDX-101) is an investigational drug developed by Ignyta, Inc., which has potential antitumor activity. It is a selective pan-trk receptor tyrosine kinase inhibitor (TKI) targeting gene fusions in trkA, trkB, and trkC (coded by NTRK1, NTRK2, and NTRK3 genes) that is currently in phase 2 clinical testing.[42]

""Larotrectinib"" is an inhibitor to all of the Trk receptors (TrkA, TrkB, and TrkC) and the drug is used as a treatment for tumors with Trk fusions.[12] A clinical study analyzing the efficiency of the drug found that Larotrectinib was an effective anti tumor treatment, and worked efficiently regardless of age of the patient or tumor type; additionally, the drug did not have long lasting side effects, highlighting the beneficial use of this drug in treating Trk fusions.[12]

References

  1. 1 2 3 GRCh38: Ensembl release 89: ENSG00000198400 - Ensembl, May 2017
  2. 1 2 3 GRCm38: Ensembl release 89: ENSMUSG00000028072 - Ensembl, May 2017
  3. ↑ "Human PubMed Reference:". National Center for Biotechnology Information, U.S. National Library of Medicine.
  4. ↑ "Mouse PubMed Reference:". National Center for Biotechnology Information, U.S. National Library of Medicine.
  5. ↑ Malenka RC, Nestler EJ, Hyman SE (2009). "Chapter 8: Atypical neurotransmitters". In Sydor A, Brown RY (eds.). Molecular Neuropharmacology: A Foundation for Clinical Neuroscience (2nd ed.). New York: McGraw-Hill Medical. ISBN 9780071481274. 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). ...
    Trk 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.
  6. ↑ Martin-Zanca D, Hughes SH, Barbacid M (April 1986). "A human oncogene formed by the fusion of truncated tropomyosin and protein tyrosine kinase sequences". Nature. 319 (6056): 743–8. Bibcode:1986Natur.319..743M. doi:10.1038/319743a0. PMID 2869410. S2CID 4316805.
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  8. ↑ Martin-Zanca D, Hughes SH, Barbacid M (2016). "A human oncogene formed by the fusion of truncated tropomyosin and protein tyrosine kinase sequences". Nature. 319 (6056): 743–8. doi:10.1136/annrheumdis-2014-207203. PMC 4893148. PMID 2869410.
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  31. 1 2 Nakamura T, Komiya M, Sone K, Hirose E, Gotoh N, Morii H, et al. (December 2002). "Grit, a GTPase-activating protein for the Rho family, regulates neurite extension through association with the TrkA receptor and N-Shc and CrkL/Crk adapter molecules". Molecular and Cellular Biology. 22 (24): 8721–34. doi:10.1128/MCB.22.24.8721-8734.2002. PMC 139861. PMID 12446789.
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  36. ↑ Borrello MG, Pelicci G, Arighi E, De Filippis L, Greco A, Bongarzone I, et al. (June 1994). "The oncogenic versions of the Ret and Trk tyrosine kinases bind Shc and Grb2 adaptor proteins". Oncogene. 9 (6): 1661–8. PMID 8183561.
  37. ↑ Jang SW, Liu X, Chan CB, Weinshenker D, Hall RA, Xiao G, Ye K (June 2009). "Amitriptyline is a TrkA and TrkB receptor agonist that promotes TrkA/TrkB heterodimerization and has potent neurotrophic activity". Chemistry & Biology. 16 (6): 644–56. doi:10.1016/j.chembiol.2009.05.010. PMC 2844702. PMID 19549602.
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