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Neurotrophins are a family of proteins that induce the survival,^[1] development, and function^[2] of neurons.

They belong to a class of growth factors, secreted proteins that are capable of signaling particular cells to survive, differentiate, or grow.^[3] Growth factors such as neurotrophins that promote the survival of neurons are known as neurotrophic factors. Neurotrophic factors are secreted by target tissue and act by preventing the associated neuron from initiating programmed cell death - thus allowing the neurons to survive. Neurotrophins also induce differentiation of progenitor cells, to form neurons.

Although the vast majority of neurons in the mammalian brain are formed prenatally, parts of the adult brain (for example, the hippocampus) retain the ability to grow new neurons from neural stem cells,^{[citation needed]} a process known as neurogenesis. Neurotrophins are chemicals that help to stimulate and control neurogenesis.

Terminology

The term neurotrophin may be used as a synonym for neurotrophic factor,^[4] but the term neurotrophin is more generally reserved for four structurally related factors: nerve growth factor (NGF), brain-derived neurotrophic factor (BDNF), neurotrophin-3 (NT-3), and neurotrophin-4 (NT-4), Neurotrophin-6 (NT-6) and neurotrophin-7 (NT-7), with neurotrophic factor additionally referring to the GDNF family of ligands and ciliary neurotrophic factor (CNTF).^[5] NT-6 and NT-7 are only found in zebrafish.^[6]

Function

During the development of the vertebrate nervous system, many neurons become redundant (because they have died, failed to connect to target cells, etc.) and are eliminated. At the same time, developing neurons send out axon outgrowths that contact their target cells.^[7] Such cells control their degree of innervation (the number of axon connections) by the secretion of various specific neurotrophic factors that are essential for neuron survival. One of these is nerve growth factor (NGF or beta-NGF), a vertebrate protein that stimulates division and differentiation of sympathetic and embryonic sensory neurons.^[8]^[9] NGF is mostly found outside the central nervous system (CNS), but slight traces have been detected in adult CNS tissues, although a physiological role for this is unknown.^[7] It has also been found in several snake venoms.^[10]^[11]

In the peripheral and central neurons, neurotrophins are important regulators for survival, differentiation, and maintenance of nerve cells. They are small proteins that secrete into the nervous system to help keep nerve cells alive. There are two distinct classes of glycosylated receptors that can bind to neurotrophins. These two proteins are p75 (NTR), which binds to all neurotrophins, and subtypes of Trk, which are each specific for different neurotrophins. The reported structure above is a 2.6 Å-resolution crystal structure of neurotrophin-3 (NT-3) complexed to the ectodomain of glycosylated p75 (NRT), forming a symmetrical crystal structure.

Receptors

There are two classes of receptors for neurotrophins: p75 and the "Trk" family of Tyrosine kinases receptors.^[12]

Types

Nerve growth factor

Nerve growth factor (NGF), the prototypical growth factor, is a protein secreted by a neuron's target cell. 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 TrkA on the neuron, and is internalized into the responsive neuron. The NGF/TrkA complex is subsequently trafficked back to the neuron's cell body. This movement of NGF from axon tip to soma is thought to be involved in the long-distance signaling of neurons^{[citation needed]}.

Brain-derived neurotrophic factor

Brain-derived neurotrophic factor (BDNF) is a neurotrophic factor found originally in the brain, but also found in the periphery. To be specific, it is a protein that has activity on certain neurons of the central nervous system and the peripheral nervous system; it helps to support the survival of existing neurons, and encourage the growth and differentiation of new neurons and synapses through axonal and dendritic sprouting. In the brain, it is active in the hippocampus, cortex, cerebellum, and basal forebrain — areas vital to learning, memory, and higher thinking. BDNF is the second neurotrophic factor to be characterized, after NGF and before neurotrophin-3.

BDNF is one of the most active substances to stimulate neurogenesis. Mice born without the ability to make BDNF suffer developmental defects in the brain and sensory nervous system, and usually die soon after birth, suggesting that BDNF plays an important role in normal neural development.

Despite its name, BDNF is actually found in a range of tissue and cell types, not just the brain. Expression can be seen in the retina, the CNS, motor neurons, the kidneys, and the prostate. Exercise has been shown to increase the amount of BDNF and therefore serve as a vehicle for neuroplasticity.^[13]

Neurotrophin-3

Neurotrophin-3, or NT-3, is a neurotrophic factor, in the NGF-family of neurotrophins. It is a protein growth factor that has activity on certain neurons of the peripheral and central nervous system; it helps to support the survival and differentiation of existing neurons, and encourages the growth and differentiation of new neurons and synapses. NT-3 is the third neurotrophic factor to be characterized, after NGF and BDNF.

NT-3 is unique among the neurotrophins in the number of neurons it has potential to stimulate, given its ability to activate two of the receptor tyrosine kinase neurotrophin receptors (TrkC and TrkB). Mice born without the ability to make NT-3 have loss of proprioceptive and subsets of mechanoreceptive sensory neurons.

Neurotrophin-4

Neurotrophin-4 (NT-4) is a neurotrophic factor that signals predominantly through the TrkB receptor tyrosine kinase. It is also known as NT4, NT5, NTF4, and NT-4/5.^[14]

Role in Programmed Cell Death

The dimerization of p75NTR when bound to proneurotrophins and sortilin leads to apoptosis via the JNK cascade.

During neuron development neurotrophins play a key role in growth, differentiation, and survival.^[15] They also play and important role in the apoptotic programmed cell death (PCD) of neurons.^[16] Neurotrophic survival signals in neurons are mediated by the high-affinity binding of neurotrophins to their respective Trk receptor.^[15] In turn, a majority of neuronal apoptotic signals are mediated by neurotrophins binding to the p75NTR.^[16] The PCD which occurs during brain development is responsible for the loss of a majority of neuroblasts and differentiating neurons.^[15] It is necessary because during development there is a massive over production of neurons which must be killed off to attain optimal function.^[15]^[16]

In the development of both the peripheral nervous system (PNS) and the central nervous system (CNS) the p75NTR-neurotrophin binding activates multiple intracellular pathways which are important in regulating apoptosis.^[15]^[17] Proneurotrophins (proNTs) are neurotrophins which are released as biologically active uncleaved pro-peptides.^[15] Unlike mature neurotrophins which bind to the p75NTR with a low affinity, proNTs preferentially bind to the p75NTR with high affinity.^[18]^[19] The p75NTR contains a death domain on its cytoplasmic tail which when cleaved activates an apoptotic pathway.^[15]^[16]^[20] The binding of a proNT (proNGF or proBDNF) to p75NTR and its sortilin co-receptor (which binds the pro-domain of proNTs) causes a p75NTR-dependent signal transduction cascade.^[15]^[16]^[18]^[20] The cleaved death domain of p75NTR activates c-Jun N-terminal kinase (JNK).^[16]^[21]^[22] The activated JNK translocates into the nucleus, where it phosphorylates and transactivates c-Jun.^[21]^[16] The transactivation of c-Jun results in the transcription of pro-apoptotic factors TFF-a, Fas-L and Bak.^[15]^[16]^[18]^[20]^[23]^[22]^[21] The importance of sotilin in p75NTR-mediated apoptosis is exhibited by the fact that the inhibition of sortilin expression in neurons expressing p75NTR suppresses proNGF-mediated apoptosis, and the prevention of proBDNF binding to p75NTR and sortilin abolished apoptotic action.^[18] Activation of p75NTR-mediated apoptosis is much more effective in the absence of Trk receptors due to the fact that activated Trk receptors suppress the JNK cascade.^[22]^[24]

The expression of TrkA or TrkC receptors in the absence of neurotrophins can lead to apoptosis, but the mechanism is poorly understood.^[25] The addition of NGF (for TrkA) or NT-3 (for TrkC) prevents this apoptosis.^[25] For this reason TrkA and TrkC are referred to as dependence receptors, because whether they induce apoptosis or survival is dependent on the presence of neurotrophins.^[16]^[26] The expression of TrkB, which is found mainly in the CNS, does not cause apoptosis.^[16] This is thought to be because it is differentially located in the cell membrane while TrkA and TrkC are co-localized with p75NTR in lipid rafts.^[16]^[25]

In the PNS (where NGF, NT-3 and NT-4 are mainly secreted) cell fate is determined by a single growth factor (i.e. neurotrophins).^[18]^[26] However, in the CNS (where BDNF is mainly secreted in the spinal cord, substantia nigra, amygdala, hypothalamus, cerebellum, hippocampus and cortex) more factors determine cell fate, including neural activity and neurotransmitter input.^[18]^[26] Neurotrophins in the CNS have also been shown to play a more important role in neural cell differentiation and function rather than survival.^[26] For these reasons, compared to neurons in the PNS, neurons of the CNS are less sensitive to the absence of a single neurotrophin or neurotrophin receptor during development; with the exception being neurons in the thalamus and substantia nigra.^[16]

Gene knockout experiments were conducted to identify the neuronal populations in both the PNS and CNS that were affected by the loss of different neurotrophins during development and the extent to which these populations were affected.^[16] These knockout experiments resulted in the loss of several neuron populations including the retina, cholinergic brainstem and the spinal cord.^[16]^[18] It was found that NGF-knockout mice had losses of a majority of their dorsal root ganglia (DRG), trigeminal ganglia and superior cervical ganglia.^[16]^[22] The viability of these mice was poor.^[16] The BDNF-knockout mice had losses of a majority of their vestibular ganglia and moderate losses of their DRG,^[27] trigeminal ganglia, nodose petrosal ganglia and cochlear ganglia.^[16]^[22] In addition they also had minor losses of their facial motoneurons located in the CNS.^[16]^[22] The viability of these mice was moderate.^[16] The NT-4-knockout mice had moderate losses of their nodose petrosal ganglia and minor losses of their DRG, trigeminal ganglia and vestibular ganglia.^[16]^[22] The NT-4-knockout mice also had minor losses of facial motoneurons.^[16]^[22] These mice were very viable.^[16] The NT-3 knockout mice had losses of a majority of their DRG, trigeminal ganglia, cochlear ganglia and superior cervival ganglia and moderate losses of nodose petrosal ganglia and vestibular ganglia.^[16]^[22] In addition the NT-3-knockout mice had moderate losses of spinal moroneurons.^[16]^[22] These mice had very poor viability.^[16] These results show that the absence of different neurotrophins result in losses of different neuron populations (mainly in the PNS).^[16] Furthermore, the absence of the neurotrophin survival signal leads to apoptosis.^[16]

References

^ Hempstead BL (February 2006). "Dissecting the diverse actions of pro- and mature neurotrophins". Curr Alzheimer Res 3 (1): 19–24. doi:10.2174/156720506775697061. PMID 16472198.
^ Reichardt LF (September 2006). "Neurotrophin-regulated signalling pathways". Philos. Trans. R. Soc. Lond., B, Biol. Sci. 361 (1473): 1545–64. doi:10.1098/rstb.2006.1894. PMC 1664664. PMID 16939974.
^ Allen SJ, Dawbarn D (February 2006). "Clinical relevance of the neurotrophins and their receptors". Clin. Sci. 110 (2): 175–91. doi:10.1042/CS20050161. PMID 16411894.
^ Neurotrophins at the US National Library of Medicine Medical Subject Headings (MeSH)
^ Sanes, Dan H., Reh, Thomas A., Harris, William A. Development of the Nervous System. Academic Press, 2012, p.173-193.
^ Sanes, Dan H. (2012). Development of the Nervous System. Academic Press. pp. 173–193.
^ ^a ^b Hofer M, Pagliusi SR, Hohn A, Leibrock J, Barde YA (1990). "Regional distribution of brain-derived neurotrophic factor mRNA in the adult mouse brain". EMBO J. 9 (8): 2459–2464. PMC 552273. PMID 2369898.
^ Piatigorsky J, Wistow G (1987). "Recruitment of enzymes as lens structural proteins". Science 236 (4808): 1554–1556. doi:10.1126/science.3589669. PMID 3589669.
^ McDonald NQ, Blundell TL, Lapatto R, Murray-Rust J, Bradshaw RA (1993). "Nerve growth factor revisited". Trends Biochem. Sci. 18 (2): 48–52. doi:10.1016/0968-0004(93)90052-O. PMID 8488558.
^ Inoue S, Ikeda K, Hayashi K, Koyama J (1992). "Purification and amino-acid sequence of a nerve growth factor from the venom of Vipera russelli russelli". Biochim. Biophys. Acta 1160 (3): 287–292. doi:10.1016/0167-4838(92)90090-Z. PMID 1477101.
^ Oda T, Inoue S, Ikeda K, Hayashi K, Koyama J (1991). "Amino acid sequences of nerve growth factors derived from cobra venoms". FEBS Lett. 279 (1): 38–40. doi:10.1016/0014-5793(91)80244-W. PMID 1995338.
^ Arévalo JC, Wu SH (July 2006). "Neurotrophin signaling: many exciting surprises!". Cell. Mol. Life Sci. 63 (13): 1523–37. doi:10.1007/s00018-006-6010-1. PMID 16699811.
^ Exercise builds brain health: key roles of growth factor cascades and inﬂammation by Carl W. Cotman, Nicole C. Berchtold and Lori-Ann Christie http://scholar.google.com/scholar?cluster=11830727319998892361&hl=en&as_sdt=0,10
^ "Entrez database entry for NT-4/5". NCBI. Retrieved 2007-05-07.
^ ^a ^b ^c ^d ^e ^f ^g ^h ⁱ Sanes, Dan H.; Reh, Thomas A.; Harris, William A. (2012). Development of the Nervous System. Academic Press. pp. 173–193.
^ ^a ^b ^c ^d ^e ^f ^g ^h ⁱ ^j ^k ^l ^m ⁿ ^o ^p ^q ^r ^s ^t ^u ^v ^w ^x ^y ^z ^aa Squire, Larry R.; Berg, Darwin; Bloom, Floyd E.; du Lac, Sascha; Ghosh, Anirvan; Spitzer, Nicholas C. (2013). Fundamental Neuroscience. Academic Press. pp. 405–435. ISBN 978-0-12-385870-2.
^ Bamji, SX (1998). "The p75 neurotrophin receptor mediates neuronal apoptosis and is essential for naturally occurring sympathetic neuron death". J Cell Biol 140 (4): 911–923. PMID 9472042.
^ ^a ^b ^c ^d ^e ^f ^g Lu, B; et al. (2005). "The Yin and Yang of Neurotrophin Action". Nature Reviews Neuroscience 6: 603–614. PMID 16062169.
^ Nikiletopoulou, V; et al. (2010). "Neurotrophin receptor TrkA and TrkC cause neuronal death whereas TrkB does not". Nature 467: 59–63. doi:10.1038/nature09336. PMID 20811452.
^ ^a ^b ^c Teng, KK; et al. (2010). "Understanding proneurotrophins actions: Recent advances and challenges". Developmental Neurobiology 70 (5): 350–359. doi:10.1002/dneu.20768. PMID 20186707.
^ ^a ^b ^c Dhanasekaran, DN; Reddy, EP (2008). "JNK Signaling in Apoptosis". Oncogene 27 (48): 6245–6251. doi:10.1038/onc.2008.301. PMID 18931691.
^ ^a ^b ^c ^d ^e ^f ^g ^h ⁱ ^j Haung, EJ; Reichardt, LF (2001). "Neurotrophins: Roles in neuronal development". Annual Review Neuroscience 24: 677–736. PMID 11520916.
^ Longo, FM; et al. (2013). "Small-molecule modulation of neurotrophin receptors: a strategy for the treatment of neurological diseases". Nature Reviews Drug Discovery 12: 507–525. PMID 23977697.
^ Yoon, SO (1998). "Competitive signaling between TrkA and p75 nerve growth factor receptors determines cell survival". Journal of Neuroscience 18 (9): 3273–81. PMID 9547236.
^ ^a ^b ^c Dekkers, MP (2013). "Death of developing neurons new insight and implications for connectivity". Journal of Cell Biology 203 (3): 385–393. doi:10.1083/jcb.201306136. PMID 24217616.
^ ^a ^b ^c ^d Lessman, V (2003). "Neurotrophin secretion: current facts and future prospects". Progress in Neurobiology 69: 341–374. PMID 12787574.
^ Ernsberger, U (2009). "Role of neurotrophin signaling in the differentiation of neurons from dorsal root ganglia and sympathetic ganglia". Cell Tissue Rec 336: 349–384. doi:10.1007/500441-009-0784-2. PMID 19387688.

External links

DevBio.com - 'Neurotrophin Receptors: The neurotrophin family consists of four members: nerve growth factor (NGF), brain derived neurotrophic factor (BDNF), neurotrophin 3 (NT-3), and neurotrophin 4 (NT-4)' (April 4, 2003)
Dr.Koop.com - 'New Clues to Neurological Diseases Discovered: Findings could lead to new treatments, two studies suggest', Steven Reinberg, HealthDay (July 5, 2006)
Helsinki.fi - 'Neurotrophic factors'
Neurotrophins at the US National Library of Medicine Medical Subject Headings (MeSH)
[1] - Neurotrophin-3 image

This article incorporates text from the public domain Pfam and InterPro IPR002072

UpToDate Contents

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1. プラチナベースの化学療法の神経学的合併症 neurologic complications of platinum based chemotherapy

English Journal

Prevention of oxaliplatin-induced mechanical allodynia and neurodegeneration by neurotropin in the rat model.

Kawashiri T, Egashira N, Watanabe H, Ikegami Y, Hirakawa S, Mihara Y, Yano T, Ikesue H, Oishi R.SourceDepartment of Pharmacy, Kyushu University Hospital, Fukuoka 812-8582, Japan.
European journal of pain (London, England).Eur J Pain.2011 Apr;15(4):344-50. Epub 2010 Sep 9.
Oxaliplatin is a key drug for colorectal cancer, but it causes acute peripheral neuropathy (triggered by cold) and chronic neuropathy (sensory and motor neuropathy) in patients. Neurotropin, a non-protein extract from the inflamed rabbit skin inoculated with vaccinia virus, has been used to treat va
PMID 20829082

Neurotrophins modulate the expression of chemokine receptors in the brain.

Avdoshina V, Becker J, Campbell LA, Parsadanian M, Mhyre T, Tessarollo L, Mocchetti I.SourceDepartment of Neuroscience, Georgetown University Medical Center, Washington, DC, USA.
Journal of neurovirology.J Neurovirol.2011 Feb;17(1):58-62. Epub 2010 Nov 30.
In the central nervous system, chemokines are primarily mediators of inflammatory processes. Their receptors, in particular, CXCR4 and CCR5, serve as co-factors along with CD4 that permit Human immunodeficiency virus-1 (HIV) infection. Moreover, experimental evidence has shown that CXCR4 and CCR5 me
PMID 21165786

Japanese Journal

慢性前立腺炎/慢性骨盤痛症候群に対するノイロトロピンの有効性報告

玉木信
臨床泌尿器科 65(3), 225-228, 2011-03
NAID 40018750170

経験と考察複合性局所疼痛症候群に対するエルカトニンの有用性

益子竜弥,本宮真,西田欽也 [他]
整形外科 62(1), 24-28, 2011-01
NAID 40017440205

Related Pictures

Antipyretics, Analgesics, Anti-Inflammatory List of Items｜Family Pharmacy Global Neurotropin Pharma – Neurotropin HGH Information Neurotrophin solution for injection ampoules 2 ml No. 10 Authenticity – Neurotropin Pharma Brains in Silicon

★リンクテーブル★

リンク元

「ノイロトロピン」

Available protein structures:
Pfam	structures
PDB	RCSB PDB; PDBe; PDBj
PDBsum	structure summary

Neurotrophin
Identifiers
Symbol	NGF
Pfam	PF00243
InterPro	IPR002072
PROSITE	PDOC00221
SCOP	1bet
SUPERFAMILY	1bet
Available protein structures:
Pfam	structures
PDB	RCSB PDB; PDBe; PDBj
PDBsum	structure summary

　　[★]

英: neurotropin

概念

ペインクリニック治療指針改訂第4版、添付文書より

ノイロトロピンはワクシニアウイルスをウサギに接種し、炎症皮膚組織から抽出した非タンパク質性生理活性物質を含有する製剤である。
痛みの下行性抑制系の賦活、ブラジキニン産生抑制、局所血流改善効果を有する。
オピオイド系を介さずにセロトニン系およびノルアドレナリンの下行性抑制系を賦活して鎮痛効果を発揮し、用量依存性に侵害刺激によるブラジキニン産生を抑制する。さらに、興奮性神経ペプチドの放出抑制作用や交感神経抑制作用、神経軸索変性の抑制作用も示唆されている。

適応

帯状疱疹後神経痛：4週間で効果の認められない場合は漫然と投薬を続けないよう
腰痛症
頸肩腕症候群
肩関節周囲炎
変形性関節症

[pmid16472198-1] Hempstead BL (February 2006). "Dissecting the diverse actions of pro- and mature neurotrophins". Curr Alzheimer Res 3 (1): 19–24. doi:10.2174/156720506775697061. PMID 16472198.

[pmid16939974-2] Reichardt LF (September 2006). "Neurotrophin-regulated signalling pathways". Philos. Trans. R. Soc. Lond., B, Biol. Sci. 361 (1473): 1545–64. doi:10.1098/rstb.2006.1894. PMC 1664664. PMID 16939974.

[pmid16411894-3] Allen SJ, Dawbarn D (February 2006). "Clinical relevance of the neurotrophins and their receptors". Clin. Sci. 110 (2): 175–91. doi:10.1042/CS20050161. PMID 16411894.

[4] Neurotrophins at the US National Library of Medicine Medical Subject Headings (MeSH)

[5] Sanes, Dan H., Reh, Thomas A., Harris, William A. Development of the Nervous System. Academic Press, 2012, p.173-193.

[6] Sanes, Dan H. (2012). Development of the Nervous System. Academic Press. pp. 173–193.

[PUB00001187-7] Hofer M, Pagliusi SR, Hohn A, Leibrock J, Barde YA (1990). "Regional distribution of brain-derived neurotrophic factor mRNA in the adult mouse brain". EMBO J. 9 (8): 2459–2464. PMC 552273. PMID 2369898.

[PUB00005102-8] Piatigorsky J, Wistow G (1987). "Recruitment of enzymes as lens structural proteins". Science 236 (4808): 1554–1556. doi:10.1126/science.3589669. PMID 3589669.

[PUB00005408-9] McDonald NQ, Blundell TL, Lapatto R, Murray-Rust J, Bradshaw RA (1993). "Nerve growth factor revisited". Trends Biochem. Sci. 18 (2): 48–52. doi:10.1016/0968-0004(93)90052-O. PMID 8488558.

[PUB00000638-10] Inoue S, Ikeda K, Hayashi K, Koyama J (1992). "Purification and amino-acid sequence of a nerve growth factor from the venom of Vipera russelli russelli". Biochim. Biophys. Acta 1160 (3): 287–292. doi:10.1016/0167-4838(92)90090-Z. PMID 1477101.

[PUB00001600-11] Oda T, Inoue S, Ikeda K, Hayashi K, Koyama J (1991). "Amino acid sequences of nerve growth factors derived from cobra venoms". FEBS Lett. 279 (1): 38–40. doi:10.1016/0014-5793(91)80244-W. PMID 1995338.

[pmid16699811-12] Arévalo JC, Wu SH (July 2006). "Neurotrophin signaling: many exciting surprises!". Cell. Mol. Life Sci. 63 (13): 1523–37. doi:10.1007/s00018-006-6010-1. PMID 16699811.

[13] Exercise builds brain health: key roles of growth factor cascades and inﬂammation by Carl W. Cotman, Nicole C. Berchtold and Lori-Ann Christie http://scholar.google.com/scholar?cluster=11830727319998892361&hl=en&as_sdt=0,10

[nt4-14] "Entrez database entry for NT-4/5". NCBI. Retrieved 2007-05-07.

[:0-15] ^ ^a ^b ^c ^d ^e ^f ^g ^h ⁱ Sanes, Dan H.; Reh, Thomas A.; Harris, William A. (2012). Development of the Nervous System. Academic Press. pp. 173–193.

[:1-16] ^ ^a ^b ^c ^d ^e ^f ^g ^h ⁱ ^j ^k ^l ^m ⁿ ^o ^p ^q ^r ^s ^t ^u ^v ^w ^x ^y ^z ^aa Squire, Larry R.; Berg, Darwin; Bloom, Floyd E.; du Lac, Sascha; Ghosh, Anirvan; Spitzer, Nicholas C. (2013). Fundamental Neuroscience. Academic Press. pp. 405–435. ISBN 978-0-12-385870-2.

[17] Bamji, SX (1998). "The p75 neurotrophin receptor mediates neuronal apoptosis and is essential for naturally occurring sympathetic neuron death". J Cell Biol 140 (4): 911–923. PMID 9472042.

[:2-18] ^ ^a ^b ^c ^d ^e ^f ^g Lu, B; et al. (2005). "The Yin and Yang of Neurotrophin Action". Nature Reviews Neuroscience 6: 603–614. PMID 16062169.

[:3-19] Nikiletopoulou, V; et al. (2010). "Neurotrophin receptor TrkA and TrkC cause neuronal death whereas TrkB does not". Nature 467: 59–63. doi:10.1038/nature09336. PMID 20811452.

[:7-20] Teng, KK; et al. (2010). "Understanding proneurotrophins actions: Recent advances and challenges". Developmental Neurobiology 70 (5): 350–359. doi:10.1002/dneu.20768. PMID 20186707.

[:8-21] Dhanasekaran, DN; Reddy, EP (2008). "JNK Signaling in Apoptosis". Oncogene 27 (48): 6245–6251. doi:10.1038/onc.2008.301. PMID 18931691.

[:4-22] ^ ^a ^b ^c ^d ^e ^f ^g ^h ⁱ ^j Haung, EJ; Reichardt, LF (2001). "Neurotrophins: Roles in neuronal development". Annual Review Neuroscience 24: 677–736. PMID 11520916.

[23] Longo, FM; et al. (2013). "Small-molecule modulation of neurotrophin receptors: a strategy for the treatment of neurological diseases". Nature Reviews Drug Discovery 12: 507–525. PMID 23977697.

[24] Yoon, SO (1998). "Competitive signaling between TrkA and p75 nerve growth factor receptors determines cell survival". Journal of Neuroscience 18 (9): 3273–81. PMID 9547236.

[:5-25] Dekkers, MP (2013). "Death of developing neurons new insight and implications for connectivity". Journal of Cell Biology 203 (3): 385–393. doi:10.1083/jcb.201306136. PMID 24217616.

[:6-26] Lessman, V (2003). "Neurotrophin secretion: current facts and future prospects". Progress in Neurobiology 69: 341–374. PMID 12787574.

[27] Ernsberger, U (2009). "Role of neurotrophin signaling in the differentiation of neurons from dorsal root ganglia and sympathetic ganglia". Cell Tissue Rec 336: 349–384. doi:10.1007/500441-009-0784-2. PMID 19387688.

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neurotropin