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Neurotrophic factors also promote the initial growth and development of neurons in the central nervous system and peripheral nervous system, and they are capable of regrowing damaged neurons in test tubes and animal models. [1] [4] Some neurotrophic factors are also released by the target tissue in order to guide the growth of developing axons.
According to the United States National Library of Medicine's medical subject headings, the term neurotrophin may be used as a synonym for neurotrophic factor, [5] 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). [6]
The Trk proteins act as receptors for NGF and related factors. Trk is a receptor tyrosine kinase. Trk dimerization and phosphorylation leads to activation of various intracellular signaling pathways including the MAP kinase, Akt, and PKC pathways. CNTF: Ciliary neurotrophic factor is another protein that acts as a survival factor for motor neurons.
Neurotrophin-4 (NT-4), [5] also known as neurotrophin-5 (NT-5), is a protein that in humans is encoded by the NTF4 gene. [6] It is a neurotrophic factor that signals predominantly through the TrkB receptor tyrosine kinase. [7] [8] NT-4 was first discovered and isolated from xenopus and viper in the year 1991 by Finn Hallbook et.al [9]
Brain-derived neurotrophic factor (BDNF), or abrineurin, [5] is a protein [6] that, in humans, is encoded by the BDNF gene. [ 7 ] [ 8 ] BDNF is a member of the neurotrophin family of growth factors, which are related to the canonical nerve growth factor (NGF), a family which also includes NT-3 and NT-4 /NT-5.
Neurotrophic factors are biomolecules – nearly all of which are peptides or small proteins – that support the growth, survival, and differentiation of both developing and mature neurons. [2] [3] [4] Examples of notable neurotrophic factors include: Insulin-like growth factor-1 (IGF-1) Glial cell line-derived neurotrophic factor (GDNF)
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Among the TrkA agonists, the small molecule gambogic amide exerts a potent neurotrophic activity decreasing apoptosis in primary hippocampal neurons. [3] The non-peptidic TrkA agonist MT2 protects neurons from Aβ amyloid-mediated death in NGF-deficient neurons [4] and talaumidin and its derivatives show neuroprotective effects, promoting neurite outgrowth in PC12 cells. [5]