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.[1][2]
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,[3][4] and in repair of muscle and nerve damage in adults.[5][6][7]
Two distinct subpopulations of Olfactory ensheathing glia (being researched for nerve repair) have been identified[8] 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.[9]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.[10][11][12] 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.[13][14][15][16]
Interactions
Low-affinity nerve growth factor receptor has been shown to interact with:
↑Johnson D, Lanahan A, Buck CR, Sehgal A, Morgan C, Mercer E, Bothwell M, Chao M (November 1986). "Expression and structure of the human NGF receptor". Cell. 47 (4): 545–54. doi:10.1016/0092-8674(86)90619-7. PMID3022937.
↑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. PMID3027580.
↑Nicol GD (October 2008). "Nerve growth factor, sphingomyelins, and sensitization in sensory neurons". Sheng Li Xue Bao. 60 (5): 603–4. PMID18958367.
↑Di Girolamo N, Sarris M, Chui J, Cheema H, Coroneo MT, Wakefield D (December 2008). "Localization of the low-affinity nerve growth factor receptor p75 in human limbal epithelial cells". Journal of Cellular and Molecular Medicine. 12 (6B): 2799–811. doi:10.1111/j.1582-4934.2008.00290.x. PMID19210757.
↑Chen LW, Yung KK, Chan YS, Shum DK, Bolam JP (December 2008). "The proNGF-p75NTR-sortilin signalling complex as new target for the therapeutic treatment of Parkinson's disease". CNS & Neurological Disorders Drug Targets. 7 (6): 512–23. doi:10.2174/187152708787122923. PMID19128208.
↑Honoré A, Le Corre S, Derambure C, Normand R, Duclos C, Boyer O, Marie JP, Guérout N (March 2012). "Isolation, characterization, and genetic profiling of subpopulations of olfactory ensheathing cells from the olfactory bulb". Glia. 60 (3): 404–13. doi:10.1002/glia.22274. PMID22161947.
↑Zubrilov I, Sagi-Assif O, Izraely S, Meshel T, Ben-Menahem S, Ginat R, Pasmanik-Chor M, Nahmias C, Couraud PO, Hoon DS, Witz IP (May 2015). "Vemurafenib resistance selects for highly malignant brain and lung-metastasizing melanoma cells". Cancer Letters. 361 (1): 86–96. doi:10.1016/j.canlet.2015.02.041. PMID25725450.
↑Redmer T (July 2018). "Deciphering mechanisms of brain metastasis in melanoma - the gist of the matter". Molecular Cancer. 17 (1): 106. doi:10.1186/s12943-018-0854-5. PMID30053879.
↑Shonukan O, Bagayogo I, McCrea P, Chao M, Hempstead B (June 2003). "Neurotrophin-induced melanoma cell migration is mediated through the actin-bundling protein fascin". Oncogene. 22 (23): 3616–23. doi:10.1038/sj.onc.1206561. PMID12789270.
↑ 18.018.1Tcherpakov M, Bronfman FC, Conticello SG, Vaskovsky A, Levy Z, Niinobe M, Yoshikawa K, Arenas E, Fainzilber M (December 2002). "The p75 neurotrophin receptor interacts with multiple MAGE proteins". The Journal of Biological Chemistry. 277 (51): 49101–4. doi:10.1074/jbc.C200533200. PMID12414813.
↑Kuwako K, Taniura H, Yoshikawa K (January 2004). "Necdin-related MAGE proteins differentially interact with the E2F1 transcription factor and the p75 neurotrophin receptor". The Journal of Biological Chemistry. 279 (3): 1703–12. doi:10.1074/jbc.M308454200. PMID14593116.
↑Bronfman FC, Tcherpakov M, Jovin TM, Fainzilber M (April 2003). "Ligand-induced internalization of the p75 neurotrophin receptor: a slow route to the signaling endosome". The Journal of Neuroscience. 23 (8): 3209–20. PMID12716928.
↑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. PMID10764727.
↑Nykjaer A, Lee R, Teng KK, Jansen P, Madsen P, Nielsen MS, Jacobsen C, Kliemannel M, Schwarz E, Willnow TE, Hempstead BL, Petersen CM (February 2004). "Sortilin is essential for proNGF-induced neuronal cell death". Nature. 427 (6977): 843–8. doi:10.1038/nature02319. PMID14985763.
↑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. PMID11729324.
↑ 25.025.1Ye 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. PMID10514511.
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. PMID3027580.