Trophic Factors. Trophic Factors. History 2. History Growth Factors. Giles Plant
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1 217 - Growth Factors Giles Plant Role in: Growth and Trophic Factors Soluble/diffusible factors - polypeptides Proliferation Differentiation (ie Cancer) Survival (degenerative diseases) Innervation Maintenance Plasticity, learning and memory Regeneration and repair Retrograde and anterograde transport. Targets. Paracrine and autocrine functions Receptors and signal transduction. Interaction with other neuroactive molecules. Trophic Factors Activities in both the developing and mature nervous systems Anatomical and functional plasticity and repair of the damaged system Cell death and neurotrophic factors (Hamburger, 1992) Trophic Factors The survival of neurons is regulated by survival factors called trophic factors. The neurotrophic hypothesis was formulated by Victor Hamburger and Rita Levi Montalcini based on studies in the developing nervous system.implantaing an extra limb increases the number of motorneurons. Showed that a decreased number of neurons dying was the cause not proliferation. Growth competition! History 1934 Hamburger - removal of a target reduces numbers of cells innervating (chick bud) 1942 Levi Montalcini and Levi target dervived signals control the survival of differentiating neurons 1954 Levi-Montalcini explant experiments using sympathetic ganglia deduced snake venom (used to actually separate nuclei acid and protein fraction) and cell extract from a cancer cell line have the same effect on axonal growth via the same product History Cohen examined the mammalian homologue of the snake venom gland-salivary gland. Male mice glands even richer in factor. When antiserum injected into mice all symapthetic motoneurons died 1959 Bocchini and Angeletti isolate NGF also known as 2.5S NGF. To purify from target organs would have required a purification factor of 100 million whereas only in mouse salivary gland
2 History Barde isolated new brain factor called Brain Derived Neurotrophic Factor 1986 Nobel prize to Levi-Montalcini and Cohen for discovery of NGF and EGF Target-derived neurotrophic factors should be: produced and released in limited quantities in the projection areas of the responsive neurons, and regulate the extent of the survival and differentiation of these neurons during embryonic development and the maintenance of their specific function in adulthood Hans Thoenen Examples of growth or trophic factors: Neurotrophins, Fibroblast growth factors, Cytokines (, LIF etc), Transforming growth factors (TGFβ, GDNF etc), Insulin-like growth factors NGF Rita Levi-Montalcini and Stanley cohen purified the first trophic factor. Nerve growth factor (NGF) for which they received the nobel prize BDNF, NT-3 and NT-4 regulate survival of various neurons. The Trk receptors are related receptors for the factors (tyrosine kinase) Ciliary neurotrophic factor is another protein that acts as a survival factor for motor neurons. acts via receptors rα, GP130 and LIFRß. GDNF Glial derived neurotrophic factor is a member of the TGFb family of proteins and is a potent trophic factor for striatal neurons. The functional receptor is heterodimer composed of type 1, type 2 receptors. Activation of SMAD proteins which then translocate to the nucleus to activate gene expression.
3 Neurotrophin Receptors Trks NGF Receptors Trophic Signals
4 Retrograde influences on neuronal viability and phenotype BDNF
5 Exercise and trophic factor production in the adult brain Other Growth Factors and cyclic AMP Procedures - method of surgery Rα camp Injection site Fluorogold LIFRβ gp 130 Mitogen activated protein kinase (MAPK) Phosphotidylinosite-3 kinase (PI-3K) Protein kinase A (PKA) 1.5mm Optic nerve 15 mm Peripheral nerve graft Biological functions Biological functions The proportion of surviving retinal ganglion cells that regrew an axon into a peripheral nerve graft Number of Regenerating vs TUJ1-positive RGCs/retina % % 10.1% 23.6% 61.6% Graft only Saline CPTcAMP CPTcAMP + 2.3% NT-4/5 TUJ1-positive Regenerating 6.9% CPTcAMP +NT-4/5 Cui, Yip, So and Harvey Molecular and Cellular Neuroscience, 22: (2003)
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