Abstract
Spontaneous regrowth of the axons of retinal ganglion cells (RGC) occurs after unilateral optic nerve transection (ONT) in the lizard Gallotia galloti. We have performed an immunohistochemical and ultrastructural study of the conus papillaris (CP) of this lizard during ontogeny and after ONT in order to characterize its cell subpopulations, innervation and putative blood-brain barrier (BBB) and to evaluate changes occurring throughout regeneration. Proliferating PCNA+ cells were abundant between embryonic stage 33 (E33) and hatching. From E33, we observed Pax2+/GS+ glial cells in the primitive CP, which became increasingly pigmented and vascularised from E35. Conal astrocytes coexpressing Pax2 with vimentin and/or GFAP were identified from E37-E38. GluT-1+/LEA+/Pax2- endothelial cells (ECs) formed a continuous endothelium with tight junctions and luminal and abluminal microfolds. In adults, the peripheral blood vessels showed a thinner calibre, stronger GluT-1 staining and more abundant microfolds than those of the central CP indicating the higher specialization involved during transport within the former. Occasional pericytes, abundant Pax2+ pigment cells, LEA+ microglia/macrophages, unmyelinated Tuj1+ nerve fibres and SV2+ synaptic vesicles were also observed in the perivascular zone. After ONT, the expression of GluT-1 and p75NTR persisted in ECs, suggesting the preservation/early recovery of the BBB. Relevant ultrastructural alterations were observed at 0.5 months postlesion, although, by 3 months, the CP had recovered the ultrastructure of controls indicating tissue recovery. Abnormal newly formed blood vessels had developed in the CP-optic nerve junction. Thus, the CP is a central nervous system structure whose regenerating capacity might be key for the nutritional support of regenerating RGCs in G. galloti.
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Abbreviations
- BBB:
-
Blood-brain barrier
- CNS:
-
Central nervous system
- CP:
-
Conus papillaris
- ECs:
-
Endothelial cells
- GFAP:
-
Glial fibrillary acidic protein
- GluT-1:
-
Glucose transporter-1
- GS:
-
Glutamine synthetase
- iR:
-
Inner region
- LEA:
-
Tomato lectin (Lycopersicon esculentum agglutinin)
- MCs:
-
Mast cells
- nPCs:
-
Non-pigmented cells
- ON:
-
Optic nerve
- ONH:
-
Optic nerve head
- ONJ:
-
Optic nerve junction
- ONT:
-
Optic nerve transection
- oR:
-
Outer region
- PCs:
-
Pigmented cells
- PCNA:
-
Proliferating cell nuclear antigen
- p75NTR :
-
p75 Neurotrophin receptor
- RER:
-
Rough endoplasmic reticulum
- RGCs:
-
Retinal ganglion cells
- SV2:
-
Synaptic vesicle marker
- TJs:
-
Tight junctions
- Tuj1:
-
Anti-beta-III tubulin antibody
- Vim:
-
Vimentin
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Acknowledgements
The authors are grateful to Dr. Nualart for his kind gift of some commercial antibodies and they express their appreciation to Agustín Fernández from the Cytometry and Microscopy Centre of the University Complutense of Madrid (UCM) for technical assistance, to the Electron Microscopy Services of the University of La Laguna (ULL) and to the University of Las Palmas of Gran Canaria (ULPGC).
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This work was supported by the Spanish Ministry of Education (Research Project BFU2007-67139) and the Regional Canary Islands Government (ACIISI, Research Project SolSubC200801000281; Project ULPAPD-08/01-4).
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Fig. S1
Immunofluorescence labelling for PCNA, Vim and Pax2/GFAP and electron micrograph in the developing or regenerating CP. Asterisks in this figure indicate CP-ONJ, for orientation. The CP tip is located at the top and the base at the bottom in all images. a, b Abundant PCNA+ cells were detected in the developing CP, being more numerous at E35 than at E33 due to the CP growth. c Labelling for PCNA at 1 month postlesion, showing proliferating cells (arrows) in different regions of the CP. d Vimentin staining was abundant in the entire adult CP. Note the stained endothelial cells (arrows). Cell nuclei are stained with Dapi. e GFAP staining in postnatals is intense in the inner CP (arrow) whereas is absent in peripheral capillaries. Cell nuclei are stained with Dapi. f Lower-power image corresponding to the Fig 2k, k´showing abundant reactive Pax2+/GFAP+ astrocytes (arrowheads) in the ONH and CP base at 1 month postlesion. Note, in addition, scarce Pax2+/GFAP- cells in the CP. g Electron micrograph of a reactive astrocyte at the CP base (arrows in inset g´) at 1 month postlesion, showing a cytoplasm filled with gliofilaments (top-left inset) and lipid droplet (arrow). Overlapping cell processes are closely located (arrowhead). Bars 50 μm (a-f) 10 μm (inset in g) 1 μm (g) (GIF 647 kb)
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Alfayate, M.C., Santos, E., Yanes, C. et al. 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 344, 63–83 (2011). https://doi.org/10.1007/s00441-011-1128-3
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DOI: https://doi.org/10.1007/s00441-011-1128-3