Low-affinity nerve growth factor receptor
The low-affinity nerve growth factor receptor (nerve growth factor receptor (TNFR superfamily, member 16), also called the LNGFR or p75 neurotrophin receptor) is one of the two receptor types for the neurotrophins, a family of protein growth factors that stimulate neuronal cells to survive and differentiate. LNGFR is a member of the tumor necrosis factor receptor (TNF receptor)superfamily – indeed, LNGFR was the first member of this large family of receptors to be characterized.[5][6]
Neurotrophins
Neurotrophins include four proteins, all of which bind to the LNGFR: nerve growth factor (NGF), brain derived neurotrophic factor (BDNF), neurotrophin-3 (NT-3), and neurotrophin-4 (NT-4).
Nerve growth factor, the prototypical growth factor, is a protein secreted by a neuron's target. NGF is critical for the survival and maintenance of sympathetic and sensory neurons. NGF is released from the target cells, binds to and activates its high-affinity receptor tropomyosin receptor kinase A (TrkA), and is internalized into the responsive neuron. The NGF/TrkA complex is subsequently trafficked back to the cell body. This movement of NGF from axon tip to soma is thought to be involved in the long-distance signaling of neurons.
The activation of TrkA by NGF is critical in inducing the survival and differentiation caused by this growth factor.
However, NGF binds at least two receptors on the surface of cells that are capable of responding to this growth factor, TrkA (pronounced "Track A") and the LNGFR.
Trk family of receptor tyrosine kinases
TrkA is a receptor tyrosine kinase (meaning it mediates its actions by causing the addition of phosphate molecules on certain tyrosines in the cell, activating cellular signaling). There are other related Trk receptors, TrkB and TrkC. 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 binds and is activated by BDNF, NT-4, and NT-3, and TrkC binds and is activated only by NT-3.
Function
Neurotrophins activating LNGFR may signal a cell to die via apoptosis, but this effect is counteracted by anti-apoptotic signaling by TrkA, TrkB, or TrkC signaling in cells that also express those receptors. LNGFR functions in a complex with Nogo receptor (NgR, Reticulon 4 receptor) to mediate RhoA-dependent inhibition of growth of regenerating axons exposed to inhibitory proteins of CNS myelin, such as Nogo, MAG or OMgP. LNGFR also activates a caspase- dependent signaling pathway that promotes developmental axon pruning, and axon degeneration in neurodegenerative disease.
Recent research has suggested a number of roles for the LNGFR, including in development of the eyes and sensory neurons,[7][8] and in repair of muscle and nerve damage in adults.[9][10][11]
Two distinct subpopulations of Olfactory ensheathing glia (being researched for nerve repair) have been identified[12] with high or low cell surface expression of low-affinity nerve growth factor receptor (p75).
Role in cancer stem cells
LNGFR has been implicated as a marker for cancer stem cells in melanoma and other cancers. Melanoma cells transplanted into an immunodeficient mouse model were shown to require expression of CD271 in order to grow a melanoma.[13] Gene knockdown of CD271 has also been shown to abolish neural crest stem cell properties of melanoma cells and decrease genomic stability leading to a reduced migration, tumorigenicity, proliferation and induction of apoptosis.[14][15][16] Furthermore, increased levels of CD271 were observed in brain metastatic melanoma cells whereas resistance to the BRAF inhibitor vemurafenib supposedly selects for highly malignant brain and lung-metastasizing melanoma cells.[17][18][19][20]
Interactions
Low-affinity nerve growth factor receptor has been shown to interact with:
References
- ^ a b c GRCh38: Ensembl release 89: ENSG00000064300 – Ensembl, May 2017
- ^ a b c GRCm38: Ensembl release 89: ENSMUSG00000000120 – Ensembl, May 2017
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- ^ Mukai J, Hachiya T, Shoji-Hoshino S, Kimura MT, Nadano D, Suvanto P, Hanaoka T, Li Y, Irie S, Greene LA, Sato TA (June 2000). "NADE, a p75NTR-associated cell death executor, is involved in signal transduction mediated by the common neurotrophin receptor p75NTR". The Journal of Biological Chemistry. 275 (23): 17566–70. doi:10.1074/jbc.C000140200. PMID 10764727.
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- ^ Lee R, Kermani P, Teng KK, Hempstead BL (November 2001). "Regulation of cell survival by secreted proneurotrophins". Science. 294 (5548): 1945–8. doi:10.1126/science.1065057. PMID 11729324.
- ^ Higuchi H, Yamashita T, Yoshikawa H, Tohyama M (April 2003). "PKA phosphorylates the p75 receptor and regulates its localization to lipid rafts". The EMBO Journal. 22 (8): 1790–800. doi:10.1093/emboj/cdg177. PMC 154469. PMID 12682012.
- ^ a b Ye X, Mehlen P, Rabizadeh S, VanArsdale T, Zhang H, Shin H, Wang JJ, Leo E, Zapata J, Hauser CA, Reed JC, Bredesen DE (October 1999). "TRAF family proteins interact with the common neurotrophin receptor and modulate apoptosis induction". The Journal of Biological Chemistry. 274 (42): 30202–8. doi:10.1074/jbc.274.42.30202. PMID 10514511.
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Further reading
- Buxser S, Puma P, Johnson GL (February 1985). "Properties of the nerve growth factor receptor. Relationship between receptor structure and affinity". The Journal of Biological Chemistry. 260 (3): 1917–26. PMID 2981877.
- Glass DJ, Nye SH, Hantzopoulos P, Macchi MJ, Squinto SP, Goldfarb M, Yancopoulos GD (July 1991). "TrkB mediates BDNF/NT-3-dependent survival and proliferation in fibroblasts lacking the low affinity NGF receptor". Cell. 66 (2): 405–13. doi:10.1016/0092-8674(91)90629-D. PMID 1649703.
- Ibáñez CF (June 2002). "Jekyll-Hyde neurotrophins: the story of proNGF". Trends in Neurosciences. 25 (6): 284–6. doi:10.1016/S0166-2236(02)02169-0. PMID 12086739.
- Radeke MJ, Misko TP, Hsu C, Herzenberg LA, Shooter EM (1987). "Gene transfer and molecular cloning of the rat nerve growth factor receptor". Nature. 325 (6105): 593–7. doi:10.1038/325593a0. PMID 3027580.
External links
- Nerve+Growth+Factor+Receptor,+Low-Affinity at the U.S. National Library of Medicine Medical Subject Headings (MeSH)