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Shah SH, Goldberg JL. The Role of Axon Transport in Neuroprotection and Regeneration. Dev Neurobiol 2018; 78:998-1010. [PMID: 30027690 DOI: 10.1002/dneu.22630] [Citation(s) in RCA: 15] [Impact Index Per Article: 2.5] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/28/2023]
Abstract
Retinal ganglion cells and other central nervous system neurons fail to regenerate after injury. Understanding the obstacles to survival and regeneration, and overcoming them, is key to preserving and restoring function. While comparisons in the cellular changes seen in these non-regenerative cells with those that do have intrinsic regenerative ability has yielded many candidate genes for regenerative therapies, complete visual recovery has not yet been achieved. Insights gained from neurodegenerative diseases, like glaucoma, underscore the importance of axonal transport of organelles, mRNA, and effector proteins in injury and disease. Targeting molecular motor networks, and their cargoes, may be necessary for realizing complete axonal regeneration and vision restoration.
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Affiliation(s)
- Sahil H Shah
- Byers Eye Institute, Stanford University, Palo Alto, California.,Neurosciences Graduate Program, University of California, San Diego, California.,Medical Scientist Training Program, University of California, San Diego, California
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2
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Williams DL. Regenerating reptile retinas: a comparative approach to restoring retinal ganglion cell function. Eye (Lond) 2016; 31:167-172. [PMID: 27834958 DOI: 10.1038/eye.2016.224] [Citation(s) in RCA: 6] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/21/2016] [Accepted: 09/22/2016] [Indexed: 11/09/2022] Open
Abstract
Transection or damage to the mammalian optic nerve generally results in loss of retinal ganglion cells by apoptosis. This cell death is seen less in fish or amphibians where retinal ganglion cell survival and axon regeneration leads to recovery of sight. Reptiles lie somewhere in the middle of this spectrum of nerve regeneration, and different species have been reported to have a significant variation in their retinal ganglion cell regenerative capacity. The ornate dragon lizard Ctenophoris ornatus exhibits a profound capacity for regeneration, whereas the Tenerife wall lizard Gallotia galloti has a more variable response to optic nerve damage. Some individuals regain visual activity such as the pupillomotor responses, whereas in others axons fail to regenerate sufficiently. Even in Ctenophoris, although the retinal ganglion cell axons regenerate adequately enough to synapse in the tectum, they do not make long-term topographic connections allowing recovery of complex visually motivated behaviour. The question then centres on where these intraspecies differences originate. Is it variation in the innate ability of retinal ganglion cells from different species to regenerate with functional validity? Or is it variances between different species in the substrate within which the nerves regenerate, the extracellular environment of the damaged nerve or the supporting cells surrounding the regenerating axons? Investigations of retinal ganglion cell regeneration between different species of lower vertebrates in vivo may shed light on these questions. Or perhaps more interesting are in vitro studies comparing axon regeneration of retinal ganglion cells from various species placed on differing substrates.
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Affiliation(s)
- D L Williams
- Department of Veterinary Medicine, University of Cambridge, Queen's Veterinary School Hospital, Cambridge, UK
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Lang DM, Romero-Alemán MDM, Dobson B, Santos E, Monzón-Mayor M. Nogo-A does not inhibit retinal axon regeneration in the lizardGallotia galloti. J Comp Neurol 2016; 525:936-954. [DOI: 10.1002/cne.24112] [Citation(s) in RCA: 5] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/18/2015] [Revised: 06/19/2016] [Accepted: 07/08/2016] [Indexed: 01/07/2023]
Affiliation(s)
- Dirk M. Lang
- Division of Physiological Sciences, Department of Human Biology; University of Cape Town; Observatory 7925 South Africa
| | - Maria del Mar Romero-Alemán
- Research Institute of Biomedical and Health Sciences; University of Las Palmas de Gran Canaria; 35016 Las Palmas Canary Islands Spain
| | - Bryony Dobson
- Division of Physiological Sciences, Department of Human Biology; University of Cape Town; Observatory 7925 South Africa
| | - Elena Santos
- Research Institute of Biomedical and Health Sciences; University of Las Palmas de Gran Canaria; 35016 Las Palmas Canary Islands Spain
| | - Maximina Monzón-Mayor
- Research Institute of Biomedical and Health Sciences; University of Las Palmas de Gran Canaria; 35016 Las Palmas Canary Islands Spain
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Han XF, Zhang Y, Xiong LL, Xu Y, Zhang P, Xia QJ, Wang TH, Ba YC. Lentiviral-Mediated Netrin-1 Overexpression Improves Motor and Sensory Functions in SCT Rats Associated with SYP and GAP-43 Expressions. Mol Neurobiol 2016; 54:1684-1697. [PMID: 26873853 DOI: 10.1007/s12035-016-9723-7] [Citation(s) in RCA: 7] [Impact Index Per Article: 0.9] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/30/2015] [Accepted: 01/13/2016] [Indexed: 02/05/2023]
Abstract
Spinal cord injury (SCI), as a major cause of disability, usually causes serious loss of motor and sensory functions. As a bifunctional axonal guidance cue, netrin-1 can attract axons via the deleted in colorectal cancer (DCC) receptors and repelling others via Unc5 receptors, but its exact role in the recovery of motor and sensory function has not well been studied, and the mechanisms remains elusive. The aim of this experiment is to determine whether lentiviral (LV)-mediated overexpression of netrin-1 or RNA interference (RNAi) can regulate the functional recovery in rats subjected to spinal cord transection (SCT). Firstly, two lentiviral vectors including Lv-exNtn-1 (netrin-1 open reading frame (ORF)) and Lv-shNtn-1 (netrin-1 sh) were constructed and injected into spinal cords rostral and caudal to the transected lesion site. Overexpressing netrin-1 enhanced significantly locomotor function, and reduced thermal and mechanical stimuli in vivo, compared with the control, while silencing netrin-1 did not significantly change the situation. Western blot and immunostaining analysis confirmed that netrin-1 ORF treatment not only effectively increased the expression level of netrin-1, also up-regulated the level of synaptophysin (SYP) in spinal cord rostral to the lesion, but also enhanced growth-associated protein-43 (GAP-43) expression in spinal cord caudal to the lesion site. Comparatively, knockdown of netrin-1 did not give rise to positive findings in our experimental condition. These findings therefore pointed that Lv-mediated netrin-1 overexpression could promote motor and sensory functional recoveries following SCT, and the underlying mechanisms were associated with SYP and GAP-43 expressions. The present study therefore provided a novel strategy for the treatment of SCI and explained the possible mechanisms for the functional improvement.
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Affiliation(s)
- Xue Fei Han
- Institute of Neuroscience and Department of Anatomy, Kunming Medical University, Kunming, 650000, China
| | - Yuan Zhang
- Institute of Neuroscience and Department of Anatomy, Kunming Medical University, Kunming, 650000, China
| | - Liu Lin Xiong
- Department of Anesthesia, Institute of Neurological Disease, Translational Neuroscience Center, West China Hospital, Sichuan University, Chengdu, 610041, People's Republic of China
| | - Yang Xu
- Department of Anesthesia, Institute of Neurological Disease, Translational Neuroscience Center, West China Hospital, Sichuan University, Chengdu, 610041, People's Republic of China
| | - Piao Zhang
- Institute of Neuroscience and Department of Anatomy, Kunming Medical University, Kunming, 650000, China
| | - Qing Jie Xia
- Department of Anesthesia, Institute of Neurological Disease, Translational Neuroscience Center, West China Hospital, Sichuan University, Chengdu, 610041, People's Republic of China.
| | - Ting Hua Wang
- Department of Anesthesia, Institute of Neurological Disease, Translational Neuroscience Center, West China Hospital, Sichuan University, Chengdu, 610041, People's Republic of China.
| | - Ying Chun Ba
- Institute of Neuroscience and Department of Anatomy, Kunming Medical University, Kunming, 650000, China.
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Kirkham M, Joven A. Studying newt brain regeneration following subtype specific neuronal ablation. Methods Mol Biol 2015; 1290:91-99. [PMID: 25740479 DOI: 10.1007/978-1-4939-2495-0_7] [Citation(s) in RCA: 8] [Impact Index Per Article: 0.9] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 06/04/2023]
Abstract
The realization that neuronal injury does not result in permanent functional or cellular loss in all vertebrates has fascinated regenerative biologists. Neuronal regeneration occurs in a subset of species, including lizards, teleost fish, axolotls, and newts. One tool for studying neuronal regeneration in the adult brain is intraventricular injection of selective neuronal toxins, which leads to loss of subpopulations of neurons. To trace cells involved in the regeneration process, plasmids encoding reporter proteins can be electroporated in vivo into the cells of interest. This protocol describes methods to label the ependymoglial cells of the brain of the red spotted newt Notophthalmus viridescens and follow their response after ablation of dopaminergic neurons.
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Affiliation(s)
- Matthew Kirkham
- Department of Cell and Molecular Biology, Karolinska Institutet, Berzelius väg 35, Stockholm, 171 77, Sweden,
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Variable functional recovery and minor cell loss in the ganglion cell layer of the lizard Gallotia galloti after optic nerve axotomy. Exp Eye Res 2013; 118:89-99. [PMID: 24184031 DOI: 10.1016/j.exer.2013.09.020] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/06/2013] [Revised: 09/12/2013] [Accepted: 09/26/2013] [Indexed: 12/23/2022]
Abstract
The lizard Gallotia galloti shows spontaneous and slow axon regrowth through a permissive glial scar after optic nerve axotomy. Although much of the expression pattern of glial, neuronal and extracellular matrix markers have been analyzed by our group, an estimation of the cell loss in the ganglion cell layer (GCL) and the degree of visual function recovery remained unresolved. Thus, we performed a series of tests indicative of effective visual function (pupillary light reflex, accommodation, visually elicited behavior) in 18 lizards at 3, 6, 9 and 12 months post-axotomy which were then processed for immunohistochemistry for the neuronal markers SMI-31 (neurofilaments), Tuj1 (beta-III tubulin) and SV2 (synaptic vesicles) at the last timepoint. Separately, cell loss in the GCL was estimated by comparative quantitation of DAPI(+) nuclei in control and 12 months experimental lizards. Additionally, 15 lizards were processed for electron microscopy to monitor relevant ultrastructural changes in the GCL, optic nerve and optic tract throughout regeneration. Hypertrophy of RGCs was persistent, morphology of the regenerated nerves varied from narrow to neuroma-like features and larger regenerated axons underwent remyelination by 9 months. The estimated cell loss in the GCL was 27% and two-third of the animals recovered the pupillary light reflex which involves the pretectum. Strikingly, visually elicited behavior involving the tectum was only restored in two specimens, presumably due to the higher complexity of this pathway. These preliminary results indicate that limited functional regeneration occurs spontaneously in the severely injured visual system of the lacertid G. galloti.
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Romero-Alemán MDM, Monzón-Mayor M, Santos E, Yanes CM. Regrowth of transected retinal ganglion cell axons despite persistent astrogliosis in the lizard (Gallotia galloti). J Anat 2013; 223:22-37. [PMID: 23656528 DOI: 10.1111/joa.12053] [Citation(s) in RCA: 5] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Accepted: 04/01/2013] [Indexed: 12/14/2022] Open
Abstract
We analysed the astroglia response that is concurrent with spontaneous axonal regrowth after optic nerve (ON) transection in the lizard Gallotia galloti. At different post-lesional time points (0.5, 1, 3, 6, 9 and 12 months) we used conventional electron microscopy and specific markers for astrocytes [glial fibrillary acidic protein (GFAP), vimentin (Vim), sex-determining region Y-box-9 (Sox9), paired box-2 (Pax2)¸ cluster differentiation-44 (CD44)] and for proliferating cells (PCNA). The experimental retina showed a limited glial response since the increase of gliofilaments was not significant when compared with controls, and proliferating cells were undetectable. Conversely, PCNA(+) cells populated the regenerating ON, optic tract (OTr) and ventricular wall of both the hypothalamus and optic tectum (OT). Subpopulations of these PCNA(+) cells were identified as GFAP(+) and Vim(+) reactive astrocytes and radial glia. Reactive astrocytes up-regulated Vim at 1 month post-lesion, and both Vim and GFAP at 12 months post-lesion in the ON-OTr, indicating long-term astrogliosis. They also expressed Pax2, Sox9 and CD44 in the ON, and Sox9 in the OTr. Concomitantly, persistent tissue cavities and disorganised regrowing fibre bundles reaching the OT were observed. Our ultrastructural data confirm abundant gliofilaments in reactive astrocytes joined by desmosomes. Remarkably, they also accumulated myelin debris and lipid droplets until late stages, indicating their participation in myelin removal. These data suggest that persistent mammalian-like astrogliosis in the adult lizard ON contributes to a permissive structural scaffold for long-term axonal regeneration and provides a useful model to study the molecular mechanisms involved in these beneficial neuron-glia interactions.
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Affiliation(s)
- María del Mar Romero-Alemán
- Departamento de Morfología (Biología Celular), Universidad de Las Palmas de Gran Canaria, Canary Islands, Spain.
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D'Angelo L, De Girolamo P, Cellerino A, Tozzini ET, Varricchio E, Castaldo L, Lucini C. Immunolocalization of S100-like protein in the brain of an emerging model organism: Nothobranchius furzeri. Microsc Res Tech 2011; 75:441-7. [PMID: 22021149 DOI: 10.1002/jemt.21075] [Citation(s) in RCA: 11] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/12/2011] [Accepted: 08/01/2011] [Indexed: 01/16/2023]
Abstract
The S100 protein in nervous tissue appears to play important roles in regulating neuronal differentiation, glial proliferation, plasticity, development, axonal growth, and in neurogenetic processes. In fish, the adult neurogenic activity is much higher than in mammals. In this study, the localization of S100 protein was investigated in the brain of annual teleost fish, Nothobranchius furzeri, which is an emerging model organism for aging research. By immunohistochemical techniques, S100 immunoreactivity (IR) was detected in glial cells, small neurons, and fibers throughout all regions of central nervous system (CNS) with different pattern of distribution. In the telencephalon, S100 IR was seen in the olfactory bulbs and in different areas of the telencephalic hemispheres. In the diencephalon, S100 positivity was observed in the habenular nuclei of the epithalamus, in the cortical thalamic nucleus, in the dorsal, ventral and caudal portions, the latter with the posterior recessus nucleus, and in the diffuse inferior lobe of the hypothalamus, along the diencephalic ventricle and in the dorsal optic tract. In the mesencephalon, S100 IR was observed in the longitudinal tori, in the optic tectum, and along the mesencephalic ventricle. In the rhombencephalon, S100 IR was shown in valvula and body of the cerebellum, and in some nuclei of the medulla oblongata. The results suggest that S100 may play a key role in the maintenance of the CNS and in neurogenesis processes in the adulthood.
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Affiliation(s)
- Livia D'Angelo
- Department of Biological Structures, Functions and Technology, University of Naples Federico II, 80137 Napoli, Italy
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Santos E, Romero-Alemán M, Monzón-Mayor M, Lang D, Rodger J, Yanes C. Expression of BDNF and NT-3 during the ontogeny and regeneration of the lacertidian (Gallotia galloti) visual system. Dev Neurobiol 2011; 71:836-53. [DOI: 10.1002/dneu.20939] [Citation(s) in RCA: 10] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/13/2022]
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11
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Development of astroglia heterogeneously expressing Pax2, vimentin and GFAP during the ontogeny of the optic pathway of the lizard (Gallotia galloti): an immunohistochemical and ultrastructural study. Cell Tissue Res 2011; 345:295-311. [DOI: 10.1007/s00441-011-1211-9] [Citation(s) in RCA: 10] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/15/2011] [Accepted: 07/13/2011] [Indexed: 01/03/2023]
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12
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Ontogeny of the conus papillaris of the lizard Gallotia galloti and cellular response following transection of the optic nerve: an immunohistochemical and ultrastructural study. Cell Tissue Res 2011; 344:63-83. [DOI: 10.1007/s00441-011-1128-3] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/07/2010] [Accepted: 12/27/2010] [Indexed: 12/31/2022]
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Shypitsyna A, Málaga-Trillo E, Reuter A, Stuermer CAO. Origin of Nogo-A by domain shuffling in an early jawed vertebrate. Mol Biol Evol 2010; 28:1363-70. [PMID: 21098000 DOI: 10.1093/molbev/msq313] [Citation(s) in RCA: 13] [Impact Index Per Article: 0.9] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/14/2022] Open
Abstract
Unlike mammals, fish are able to regenerate axons in their central nervous system. This difference has been partly attributed to the loss/acquisition of inhibitory proteins during evolution. Nogo-A--the longest isoform of the reticulon4 (rtn4) gene product--is commonly found in mammalian myelin where it acts as a potent inhibitor of axonal regeneration. Interestingly, fish RTN4 isoforms were previously reported to lack the most inhibitory Nogo-A-specific region (NSR). Nevertheless, fish axons collapse on contact with mammalian NSR, suggesting that fish possess a functional Nogo-A receptor but not its ligand. To reconcile these findings, we revisited the early evolution of rtn4. Mining of current genome databases established the unequivocal presence of NSR-coding sequences in fish rtn4 paralogues. Further comparative analyses indicate that the common ancestor of fish and tetrapods had an NSR-coding rtn4 gene, which underwent duplication and divergent evolution in bony fish. Our genomic survey also revealed that the cephalochordate Branchiostoma floridae contains a single rtn gene lacking the NSR. Hence, Nogo-A most probably arose independently in the rtn4 gene of a gnathostome ancestor before the split of the fish and tetrapod lineages. Close examination of the NSR uncovered clusters of structural and sequential similarities with neurocan (NCAN), an inhibitory proteoglycan of the glial scar. Notably, the shared presence of transposable elements in ncan and rtn4 genes suggests that Nogo-A originated via insertion of an ncan-like sequence into the rtn4 gene of an early jawed vertebrate with myelinated axons.
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Romero-Alemán M, Monzón-Mayor M, Santos E, Yanes C. Expression of neuronal markers, synaptic proteins, and glutamine synthetase in the control and regenerating lizard visual system. J Comp Neurol 2010; 518:4067-87. [DOI: 10.1002/cne.22444] [Citation(s) in RCA: 16] [Impact Index Per Article: 1.1] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/20/2022]
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Abstract
For many years the mammalian CNS has been seen as an organ that is unable to regenerate. However, it was also long known that lower vertebrate species are capable of impressive regeneration of CNS structures. How did this situation arise through evolution? Increasing cellular and molecular understanding of regeneration in different animal species coupled with studies of adult neurogenesis in mammals is providing a basis for addressing this question. Here we compare CNS regeneration among vertebrates and speculate on how this ability may have emerged or been restricted.
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Lang DM, Monzon-Mayor M, del Mar Romero-Aleman M, Yanes C, Santos E, Pesheva P. Tenascin-R and axon growth-promoting molecules are up-regulated in the regenerating visual pathway of the lizard (Gallotia galloti). Dev Neurobiol 2008; 68:899-916. [DOI: 10.1002/dneu.20624] [Citation(s) in RCA: 21] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/03/2023]
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Santos E, Monzón-Mayor M, Romero-Alemán M, Yanes C. Distribution of neurotrophin-3 during the ontogeny and regeneration of the lizard (Gallotia galloti) visual system. Dev Neurobiol 2007; 68:31-44. [DOI: 10.1002/dneu.20566] [Citation(s) in RCA: 11] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/29/2022]
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Santos E, Yanes CM, Monzón-Mayor M, del Mar Romero-Alemán M. Peculiar and typical oligodendrocytes are involved in an uneven myelination pattern during the ontogeny of the lizard visual pathway. ACTA ACUST UNITED AC 2006; 66:1115-24. [PMID: 16929522 DOI: 10.1002/neu.20256] [Citation(s) in RCA: 11] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/09/2022]
Abstract
We studied the myelination of the visual pathway during the ontogeny of the lizard Gallotia galloti using immunohistochemical methods to stain the myelin basic protein (MBP) and proteolipid protein (PLP/DM20), and electron microscopy. The staining pattern for the PLP/DM20 and MBP overlapped during the lizard ontogeny and was first observed at E39 in cell bodies and fibers located in the temporal optic nerve, optic chiasm, middle optic tract, and in the stratum album centrale of the optic tectum (OT). The expression of these proteins extended to the nerve fiber layer (NFL) of the temporal retina and to the outer strata of the OT at E40. From hatching onwards, the labeling became stronger and extended to the entire visual pathway. Our ultrastructural data in postnatal and adult animals revealed the presence of both myelinated and unmyelinated retinal ganglion cell axons in all visual areas, with a tendency for the larger axons to show the thicker myelin sheaths. Moreover, two kinds of oligodendrocytes were described: peculiar oligodendrocytes displaying loose myelin sheaths were only observed in the NFL, whereas typical medium electron-dense oligodendrocytes displaying compact myelin sheaths were observed in the rest of the visual areas. The weakest expression of the PLP/DM20 in the NFL of the retina appears to be linked to the loose appearance of its myelin sheaths. We conclude that typical and peculiar oligodendrocytes are involved in an uneven myelination process, which follows a temporo-nasal and rostro-caudal gradient in the retina and ON, and a ventro-dorsal gradient in the OT.
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Affiliation(s)
- Elena Santos
- Department of Cellular Biology, Faculty of Biology, University of La Laguna, 38206 Tenerife, Canary Islands, Spain
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Schweigreiter R, Roots BI, Bandtlow CE, Gould RM. Understanding Myelination Through Studying Its Evolution. INTERNATIONAL REVIEW OF NEUROBIOLOGY 2006; 73:219-73. [PMID: 16737906 DOI: 10.1016/s0074-7742(06)73007-0] [Citation(s) in RCA: 37] [Impact Index Per Article: 2.1] [Reference Citation Analysis] [MESH Headings] [Grants] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 01/20/2023]
Affiliation(s)
- Rüdiger Schweigreiter
- Medical University Innsbruck, Biocenter Innsbruck, Division of Neurobiochemistry, A-6020 Innsbruck, Austria
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Dunlop SA, Tee LBG, Stirling RV, Taylor AL, Runham PB, Barber AB, Kuchling G, Rodger J, Roberts JD, Harvey AR, Beazley LD. Failure to restore vision after optic nerve regeneration in reptiles: Interspecies variation in response to axotomy. J Comp Neurol 2004; 478:292-305. [PMID: 15368531 DOI: 10.1002/cne.20299] [Citation(s) in RCA: 32] [Impact Index Per Article: 1.6] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/22/2022]
Abstract
Optic nerve regeneration within the reptiles is variable. In a snake, Viper aspis, and the lizard Gallotia galloti, regeneration is slow, although some retinal ganglion cell (RGC) axons eventually reach the visual centers (Rio et al. [1989] Brain Res 479:151-156; Lang et al. [1998] Glia 23:61-74). By contrast, in a lizard, Ctenophorus ornatus, numerous RGC axons regenerate rapidly to the visual centers, but unless animals are stimulated visually, the regenerated projection lacks topography and animals remain blind via the experimental eye (Beazley et al. [2003] J. Neurotrauma 20:1263-1269). V. aspis, G. galloti, and C. ornatus belong respectively to the Serpentes, Lacertidae, and Agamidae within the Eureptilia, the major modern group of living reptiles comprising the Squamata (snakes, lizards, and geckos) and the Crocodyllia. Here we have extended the findings on Eureptilia to include two geckos (Gekkonidae), Cehyra variegata and Nephrurus stellatus. We also examined a turtle, Chelodina oblonga, the Testudines being the sole surviving representatives of the Parareptilia, the more ancient reptilian group. In all three species, visually elicited behavioral responses were absent throughout regeneration, a result supported electrophysiologically; axonal tracing revealed that only a small proportion of RGC axons crossed the lesion and none entered the contralateral optic tract. RGC axons failed to reach the chiasm in C. oblonga, and in G. variegata, and N. stellatus RGC axons entered the opposite optic nerve; a limited ipsilateral projection was seen in G. variegata. Our results support a heterogeneous response to axotomy within the reptiles, each of which is nevertheless dysfunctional.
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Affiliation(s)
- Sarah A Dunlop
- School of Animal Biology, The University of Western Australia, Crawley 6009, Australia.
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Romero-Alemán MDM, Monzón-Mayor M, Yanes C, Arbelo-Galván JF, Lang D, Renau-Piqueras J, Negrín-Martínez C. S100 immunoreactive glial cells in the forebrain and midbrain of the lizard Gallotia galloti during ontogeny. JOURNAL OF NEUROBIOLOGY 2003; 57:54-66. [PMID: 12973828 DOI: 10.1002/neu.10258] [Citation(s) in RCA: 28] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 11/06/2022]
Abstract
We identified S100 immunoreactive cells in the brain of the lizard Gallotia galloti during ontogeny using immunohistochemical techniques for light and electron microscopy. In double labeling experiments with antibodies specific for S100A1 and S100B (anti-S100) and proliferative cell nuclear antigen (anti-PCNA), myelin basic protein (anti-MBP), phosphorylated neurofilaments (SMI-31), glial fibrillary acidic protein (anti-GFAP), or glutamine synthetase (anti-GS), we detected S100-like immunoreactivity in glial cells but never in neurons. Restricted areas of the ventricular zone were stained in the hypothalamus from E32 to postnatal stages, and in the telencephalon at E35, E36, and in adults. S100 immunoreactivity was observed predominantly in scattered PCNA-negative cells that increased in number from E35 to the adult stage in the myelinated tracts of the brain and had the appearance of oligodendrocytes. Quantitative analysis revealed that all of the S100-positive glial cells were GFAP-negative, whereas most of the S100-positive glial cells were GS-positive. Ultrastructurally, most of these S100-positive/GS-positive glial cells resembled oligodendrocytes of light and medium electron density. In adult lizards, a small subpopulation of astrocyte-like cells was also stained in the pretectum. We conclude that in the lizard S100 can be considered a marker of a subpopulation of oligodendrocytes rather than of astrocytes, as is the case in mammals. The S100-positive subpopulation of oligodendrocytes in the lizard could represent cells actively involved in the process of myelination during development and in the maintenance of myelin sheaths in the adult.
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Affiliation(s)
- María del Mar Romero-Alemán
- Departamento de Morfología (Biología Celular), Facultad de Ciencias de la Salud, Universidad de Las Palmas de Gran Canaria, 35080 Las Palmas, Canary Islands, Spain
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Lang DM, del Mar Romero-Aleman M, Arbelo-Galvan JF, Stuermer CAO, Monzon-Mayor M. Regeneration of retinal axons in the lizard Gallotia galloti is not linked to generation of new retinal ganglion cells. JOURNAL OF NEUROBIOLOGY 2002; 52:322-35. [PMID: 12210099 DOI: 10.1002/neu.10099] [Citation(s) in RCA: 28] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 11/06/2022]
Abstract
Using anterograde tracing with HRP and antibodies (ABs) against neurofilaments, we show that regrowth of retinal ganglion cell (RGC) axons in the lizard Gallotia galloti commences only 2 months after optic nerve transection (ONS) and continues over at least 9 months. This is unusually long when compared to RGC axon regeneration in fish or amphibians. Following ONS, lizard RGCs up-regulate the immediate early gene C-JUN for 9 months or longer, indicating their reactive state. In keeping with the in vivo data, axon outgrowth from lizard retinal explants is increased above control levels from 6 weeks, reaches its maximum as late as 3 months, and remains elevated for at least 1 year after ONS. By means of BrdU incorporation assays and antiproliferating cell nuclear antigen immunohistochemistry, we show that the late axon outgrowth is not derived from new RGCs that might have arisen in reaction to ONS: no labeled cells were detected in lizard retinas at 0.5, 1, 1.5, 3, 6, and 12 months after ONS. Conversely, numbers of RGCs undergoing apoptosis were too low to be detectable in TUNEL assays at any time after ONS. These results demonstrate that retinal axon regeneration in G. galloti is due to axon regrowth from the resident population of RGCs, which remain in a reactive state over an extended time interval. Neurogenesis does not appear to be involved in RGC axon regrowth in G. galloti.
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Affiliation(s)
- Dirk M Lang
- Department of Human Biology, Faculty of Health Sciences, University of Cape Town, Observatory 7925, South Africa.
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Bernhardt RR. Cellular and molecular bases of axonal regeneration in the fish central nervous system. Exp Neurol 1999; 157:223-40. [PMID: 10364435 DOI: 10.1006/exnr.1999.7059] [Citation(s) in RCA: 55] [Impact Index Per Article: 2.2] [Reference Citation Analysis] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/03/2023]
Affiliation(s)
- R R Bernhardt
- Neurobiology, Universitaet Hamburg, Martinistrasse 52, Hamburg, D-20246, Germany
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