Abstract
Here we propose a model of a peripheral axon with a great deal of autonomy from its cell body—the autonomous axon—but with a substantial dependence on its ensheathing Schwann cell (SC), the axon-SC unit. We review evidence in several fields and show that (i) axons can extend sprouts and grow without the concurrence of the cell body, but regulated by SCs; (ii) axons synthesize their proteins assisted by SCs that supply them with ribosomes and, probably, with mRNAs by way of exosomes; (iii) the molecular organization of the axoplasm, i.e., its phenotype, is regulated by the SC, as illustrated by the axonal microtubular content, which is down-regulated by the SC; and (iv) the axon has a program for self-destruction that is boosted by the SC. The main novelty of this model axon-SC unit is that it breaks with the notion that all proteins of the nerve cell are specified by its own nucleus. The notion of a collaborative specification of the axoplasm by more than one nucleus, which we present here, opens a new dimension in the understanding of the nervous system in health and disease and is also a frame of reference to understand other tissues or cell associations.
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References
Aguayo AJ, Bray GM, Rasminsky M, Zwimpfer T, Carter D, Vidal-Sanz M (1990) Synaptic connections made by axons regenerating in the central nervous system of adult mammals. J Exp Biol 153:199–224
Alvarez J (2001) The autonomous axon: a model based on local synthesis of proteins. Biol Res 34(2):103–109
Alvarez J, Benech CR (1983) Axoplasmic incorporation of amino acids in a myelinated fiber exceeds that of its soma: a radioautographic study. Exp Neurol 82(1):25–42
Alvarez J, Zarour J (1983) Microtubules in short and in long axons of the same caliber: implications for the maintenance of the neuron. Exp Neurol 79(1):283–286
Alvarez J, Arredondo F, Espejo F, Williams V (1982) Regulation of axonal microtubules: effect of sympathetic hyperactivity elicited by reserpine. Neuroscience 7(10):2551–2559
Alvarez J, Moreno RD, Llanos O, Inestrosa NC, Brandan E, Colby T, Esch FS (1992) Axonal sprouting induced in the sciatic nerve by the amyloid precursor protein (APP) and other antiproteases. Neurosci Lett 144(1–2):130–134
Alvarez J, Moreno RD, Inestrosa NC (1995) Mitosis of Schwann cells and demyelination are induced by the amyloid precursor protein and other protease inhibitors in the rat sciatic nerve. Eur J Neurosci 7(1):152–159
Alvarez J, Giuditta A, Koenig E (2000) Protein synthesis in axons and terminals: significance for maintenance, plasticity and regulation of phenotype. With a critique of slow transport theory. Prog Neurobiol 62:1–62
Alvarez-Erviti L, Seow Y, Yin H, Betts C, Lakhal S, Wood MJA (2011) Delivery of siRNA to the mouse brain by systemic injection of targeted exosomes. Nat Biotechnol 29(4):341–345
Baj-Krzyworzeka M, Szatanek R, Weglarczyk K, Baran J, Urbanowicz B, Brański P, Ratajczak MZ, Zembala M (2006) Tumour-derived microvesicles carry several surface determinants and mRNA of tumour cells and transfer some of these determinants to monocytes. Cancer Immunol Immunother 55:808–818
Barrientos SA, Martinez NW, Yoo S, Jara JS, Zamorano S, Hetz C, Twiss JL, Alvarez J, Court FA (2011) Axonal degeneration is mediated by the mitochondrial permeability transition pore. J Neurosci 31:359–370
Benavides E, Alvarez J (1998) Peripheral axons of Wlds mice, which regenerate after a delay of several weeks, do so readily when transcription is inhibited in the distal stump. Neurosci Lett 258(2):77–80
Bisby MA, Keen P (1985) The effect of a conditioning lesion on the regeneration rate of peripheral nerve axons containing substance P. Brain Res 336(2):201–206
Bittner GD, Mann DW (1976) Differential survival of isolated portions of crayfish axons. Cell Tissue Res 169(3):301–311
Blesch A, Tuszynski MH (2009) Spinal cord injury: plasticity, regeneration and the challenge of translational drug development. Trends Neurosci 32(1):41–47
Bustos J, Vial JD, Faundez V, Alvarez J (1991) Axons sprout and microtubules increase after local inhibition of RNA synthesis, and microtubules decrease after inhibition of protein synthesis: a morphometric study of rat sural nerves. Eur J Neurosci 3(11):1123–1133
Cajal SR (1928) Degeneration and regeneration of the nervous system. Oxford University Press
Chattopadhyay S, Shubayev V (2009) MMP-9 controls Schwann cell proliferation and phenotypic remodeling via IGF-1 and ErbB receptor-mediated activation of MEK/ERK pathway. Glia 57(12):1316–1325
Chen Z-L, Yu W-M, Strickland S (2007) Peripheral regeneration. Annu Rev Neurosci 30:209–233
Cocucci E, Racchetti G, Meldolesi J (2009) Shedding microvesicles: artefacts no more. Trends Cell Biol 19(2):43–51
Court F, Alvarez J (2000) Nerve regeneration in Wld(s) mice is normalized by actinomycin D. Brain Res 867:1–8
Court FA, Alvarez J (2005) Local regulation of the axonal phenotype, a case of merotrophism. Biol Res 38:365–374
Court FA, Alvarez J (2011) Slow axoplasmic transport under scrutiny. Biol Res 44:283–293
Court FA, Coleman MP (2012) Mitochondria as a central sensor for axonal degenerative stimuli. Trends Neurosci 35:364–372
Court FA, Hendriks WTJ, Macgillavry HD, Alvarez J, van Minnen J (2008) Schwann cell to axon transfer of ribosomes: toward a novel understanding of the role of glia in the nervous system. J Neurosci 28:11024–11029
Court FA, Midha R, Cisterna BA, Grochmal J, Shakhbazau A, Hendriks WT, van Minnen J (2011) Morphological evidence for a transport of ribosomes from Schwann cells to regenerating axons. Glia 59:1529–1539
Edström A (1966) Amino acid incorporation in isolated Mauthner nerve fibre of goldfish. J Neurochem 13:315–321
Ellerton EL, Thompson WJ, Rimer M (2008) Induction of zinc-finger proliferation 1 expression in non-myelinating Schwann cells after denervation. Neuroscience 153(4):975–985. doi:10.1016/j.neuroscience.2008.02.078
Espejo F, Alvarez J (1986) Microtubules and calibers in normal and regenerating axons of the sural nerve of the rat. J Comp Neurol 250(1):65–72. doi:10.1002/cne.902500106
Fabrizi C, Kelly BM, Gillespie CS, Schlaepfer WW, Scherer SS, Brophy PJ (1997) Transient expression of the neurofilament proteins NF-L and NF-M by Schwann cells is regulated by axonal contact. J Neurosci Res 50(2):291–299
Fadic R, Alvarez J (1986) Calibers and microtubules of sympathetic axons are not subject to trophic control by the preganglionic nerve. Exp Neurol 94(1):237–240
Fadic R, Vergara J, Alvarez J (1985) Microtubules and caliber of central and peripheral processes of sensory axons. J Comp Neurol 236(2):258–264. doi:10.1002/cne.902360209
Faundez V, Cordero ME, Rosso P, Alvarez J (1990) Calibers and microtubules of nerve fibers: differential effect of undernutrition in developing and adult rats. Brain Res 509(2):198–204
Filbin MT (2003) Myelin-associated inhibitors of axonal regeneration in the adult mammalian CNS. Nat Rev Neurosci 4:703–713
Friede RL, Samorajski T (1970) Axon caliber related to neurofilaments and microtubules in sciatic nerve fibers of rats and mice. Anat Rec 167(4):379–387. doi:10.1002/ar.1091670402
Glenn TD, Talbot WS (2013) Signals regulating myelination in peripheral nerves and the Schwann cell response to injury. Curr Opin Neurobiol 23:1041–1048
Harding C, Heuser J, Stahl P (1983) Receptor-mediated endocytosis of transferrin and recycling of the transferrin receptor in rat reticulocytes. J Cell Biol 97(2):329–339
Hayworth CR, Moody SE, Chodosh LA, Krieg P, Rimer M, Thompson WJ (2006) Induction of neuregulin signaling in mouse schwann cells in vivo mimics responses to denervation. J Neurosci 26(25):6873–6884. doi:10.1523/JNEUROSCI.1086-06.2006
Hernandez C, Blackburn E, Alvarez J (1989) Calibre and microtubule content of the non-medullated and myelinated domains of optic nerve axons of rats. Eur J Neurosci 1(6):654–658
Hoy RR, Bittner GD, Kennedy D (1967) Regeneration in crustacean motoneurons: evidence for axonal fusion. Science 156(3772):251–252
Iñiguez A, Alvarez J (1999) Isolated axons of Wlds mice regrow centralward. Neurosci Lett 268:57–114
Jessen KR, Mirsky R (2008) Negative regulation of myelination: relevance for development, injury, and demyelinating disease. Glia 56(14):1552–1565
Jung H, Yoon BC, Holt CE (2012) Axonal mRNA localization and local protein synthesis in nervous system assembly, maintenance and repair. Nat Rev Neurosci 13:308–324
Kang H, Tian L, Mikesh M, Lichtman JW, Thompson WJ (2014) Terminal Schwann cells participate in neuromuscular synapse remodeling during reinnervation following nerve injury. J Neurosci 34(18):6323–6333. doi:10.1523/JNEUROSCI.4673-13.2014
Koenig E (1984) Local synthesis of axonal protein. In: Lajtha A (ed) Handbook of neurochemistry, vol 7. Plenum, New York, pp 315–340
Kramer-Albers EM, Bretz N, Tenzer S, Winterstein C, Mobius W, Berger H, Nave KA, Schild H, Trotter J (2007) Oligodendrocytes secrete exosomes containing major myelin and stress-protective proteins: trophic support for axons? Proteomics Clin Appl 1(11):1446–1461. doi:10.1002/prca.200700522
Krasne FB, Lee SH (1977) Regenerating afferents establish synapses with a target neuron that lacks its cell body. Science 198(4316):517–519
Kun A, Otero L, Sotelo-Silveira JR, Sotelo JR (2007) Ribosomal distributions in axons of mammalian myelinated fibers. J Neurosci Res 85(10):2087–2098. doi:10.1002/jnr.21340
Li Y, Thompson WJ (2011) Nerve terminal growth remodels neuromuscular synapses in mice following regeneration of the postsynaptic muscle fiber. J Neurosci 31(37):13191–13203. doi:10.1523/JNEUROSCI.2953-11.2011
Lin AC, Holt CE (2008) Function and regulation of local axonal translation. Curr Opin Neurobiol 18:60–68
Liu H, Kim Y, Chattopadhyay S, Shubayev I, Dolkas J, Shubayev VI (2010) Matrix metalloproteinase inhibition enhances the rate of nerve regeneration in vivo by promoting dedifferentiation and mitosis of supporting schwann cells. J Neuropathol Exp Neurol 69(4):386–395. doi:10.1097/NEN.0b013e3181d68d12
Lopez JM, Alvarez J (1990) The microtubular pattern changes at the spinal cord-root junction and reverts at the root-peripheral nerve junction in sensory and motor fibres of the rat. Eur J Neurosci 2(10):873–878
Lopez-Verrilli MA, Court FA (2012) Transfer of vesicles from schwann cells to axons: a novel mechanism of communication in the peripheral nervous system. Front Physiol 3:205
Lopez-Verrilli MA, Court FA (2013) Exosomes: mediators of communication in eukaryotes. Biol Res 46:5–11
Lopez-Verrilli MA, Picou F, Court FA (2013) Schwann cell-derived exosomes enhance axonal regeneration in the peripheral nervous system. Glia 61:1795–1806
Mason A, Muller KJ (1982) Axon segments sprout at both ends: tracking growth with fluorescent D-peptides. Nature 296(5858):655–657
Masuda-Nakagawa LM, Muller KJ, Nicholls JG (1993) Axonal sprouting and laminin appearance after destruction of glial sheaths. Proc Natl Acad Sci USA 90(11):4966–4970
McQuarrie IG, Jacob JM (1991) Conditioning nerve crush accelerates cytoskeletal protein transport in sprouts that form after a subsequent crush. J Comp Neurol 305(1):139–147. doi:10.1002/cne.903050113
Moreno RD, Inestrosa NC, Culwell AR, Alvarez J (1996) Sprouting and abnormal contacts of nonmedullated axons, and deposition of extracellular material induced by the amyloid precursor protein (APP) and other protease inhibitors. Brain Res 718:13–24
Palay SL, Palade GE (1955) The fine structure of neurons. J Biophys Biochem Cytol 1(1):69–88
Pannese E, Ledda M, Arcidiacono G, Rigamonti L, Procacci P (1984a) A comparison of the density of microtubules in the central and peripheral axonal branches of the pseudounipolar neurons of lizard spinal ganglia. Anat Rec 208(4):595–605. doi:10.1002/ar.1092080415
Pannese E, Procacci P, Ledda M, Arcidiacono G, Rigamonti L (1984b) A quantitative study of microtubules in motor and sensory axons. Acta Anat 118(4):193–200
Pannese E, Ledda M, Matsuda S (1988) Nerve fibres with myelinated and unmyelinated portions in dorsal spinal roots. J Neurocytol 17(5):693–700
Peters A, Palay S, Webster HdF (1991) Fine structure of the nervous system: neurons and their supporting cells. Oxford Press, New York
Rigaud M, Gemes G, Barabas M-E, Chernoff DI, Abram SE, Stucky CL, Hogan QH (2008) Species and strain differences in rodent sciatic nerve anatomy: implications for studies of neuropathic pain. Pain 136:188–201
Roberson MD, Toews AD, Goodrum JF, Morell P (1992) Neurofilament and tubulin mRNA expression in Schwann cells. J Neurosci Res 33(1):156–162
Russo F, Di Bella S, Nigita G, Macca V, Laganà A, Giugno R, Pulvirenti A, Ferro A (2012) miRandola: extracellular circulating microRNAs database. PLoS ONE 7:e47786. doi:10.1371/journal.pone.0047786
Saitua F, Alvarez J (1989) Microtubular packing varies along the course of motor and sensory axons: possible regulation of microtubules by environmental cues. Neurosci Lett 104(3):249–252
Schmitte R, Tipold A, Stein VM, Schenk H, Flieshardt C, Grothe C, Haastert K (2010) Genetically modified canine Schwann cells–In vitro and in vivo evaluation of their suitability for peripheral nerve tissue engineering. J Neurosci Methods 186(2):202–208. doi:10.1016/j.jneumeth.2009.11.023
Serra M, Alvarez J (1989) On the asymmetry of the primary branching of vagal sensory axons: possible role of the supporting tissue. J Comp Neurol 284(1):108–118. doi:10.1002/cne.902840108
Skog J, Würdinger T, van Rijn S, Meijer DH, Gainche L, Sena-Esteves M, Curry WT, Carter BS, Krichevsky AM, Breakefield XO (2008) Glioblastoma microvesicles transport RNA and proteins that promote tumour growth and provide diagnostic biomarkers. Nat Cell Biol 10:1470–1476
Smith RS (1973) Microtubule and neurofilament densities in amphibian spinal root nerve fibers: relationship to axoplasmic transport. Can J Physiol Pharmacol 51(11):798–806
Tapia M, Inestrosa NC, Alvarez J (1995) Early axonal regeneration: repression by Schwann cells and a protease? Exp Neurol 131(1):124–132
Théry C, Zitvogel L, Amigorena S (2002) Exosomes: composition, biogenesis and function. Nat Rev Immunol 2:569–579
Théry C, Ostrowski M, Segura E (2009) Membrane vesicles as conveyors of immune responses. Nat Rev Immunol 9:581–593
Twiss J, Fainzilber M (2009) Ribosomes in axons - scrounging from the neighbors? Trends Cell Biol 19:236–243
Valadi H, Ekström K, Bossios A, Sjöstrand M, Lee JJ, Lötvall JO (2007) Exosome-mediated transfer of mRNAs and microRNAs is a novel mechanism of genetic exchange between cells. Nat Cell Biol 9(6):654–659
Valenzuela V, Collyer E, Armentano D, Parsons GB, Court FA, Hetz C (2012) Activation of the unfolded protein response enhances motor recovery after spinal cord injury. Cell Death Dis 3:e272. doi:10.1038/cddis.2012.8
Vergara J, Serra M, Saitua F, Iturriaga R, Alvarez J (1991) Axonal microtubules: comparative anatomy in vertebrates, including man. J Submicrosc Cytol Pathol 23(3):357–363
Villegas R, Martinez NW, Lillo J, Pihan P, Hernandez D, Twiss JL, Court FA (2014) Calcium release from intra-axonal endoplasmic reticulum leads to axon degeneration through mitochondrial dysfunction. J Neurosci 34(21):7179–7189. doi:10.1523/JNEUROSCI.4784-13.2014
Wang D, Sun T (2010) Neural plasticity and functional recovery of human central nervous system with special reference to spinal cord injury. Spinal Cord 49:486–492
Windebank AJ, Wood P, Bunge RP, Dyck PJ (1985) Myelination determines the caliber of dorsal root ganglion neurons in culture. J Neurosci 5(6):1563–1569
Yiu G, He Z (2006) Glial inhibition of CNS axon regeneration. Nat Rev Neurosci 7:617–627
Yokota R (1984) Occurrence of long non-myelinated axonal segments intercalated in myelinated, presumably sensory axons: electron microscopic observations in the dog atrial endocardium. J Neurocytol 13(1):127–143
Yoo S, van Niekerk EA, Merianda TT, Twiss JL (2010) Dynamics of axonal mRNA transport and implications for peripheral nerve regeneration. Exp Neurol 223(1):19–27. doi:10.1016/j.expneurol.2009.08.011
Zelena J, Lubinska L, Gutmann E (1968) Accumulation of organelles at the ends of interrupted axons. Z Mikrosk Anat Forsch 91(2):200–219
Zhang J, Zhao F, Wu G, Li Y, Jin X (2010) Functional and histological improvement of the injured spinal cord following transplantation of Schwann cells transfected with NRG1 gene. Anat Rec 293(11):1933–1946. doi:10.1002/ar.21223
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Court, F.A., Alvarez, J. (2016). Schwann Cell and Axon: An Interlaced Unit—From Action Potential to Phenotype Expression. In: von Bernhardi, R. (eds) Glial Cells in Health and Disease of the CNS. Advances in Experimental Medicine and Biology, vol 949. Springer, Cham. https://doi.org/10.1007/978-3-319-40764-7_9
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