Abstract
In contrast to mammals, teleost fish exhibit an enormous potential to regenerate adult spinal cord tissue after injury. However, the mechanisms mediating this ability are largely unknown. Here, we analyzed the major processes underlying structural and functional regeneration after amputation of the caudal portion of the spinal cord in Apteronotus leptorhynchus, a weakly electric teleost. After a transient wave of apoptotic cell death, cell proliferation started to increase 5 days after the lesion and persisted at high levels for at least 50 days. New cells differentiated into neurons, glia, and ependymal cells. Retrograde tract tracing revealed axonal re-growth and innervation of the regenerate. Functional regeneration was demonstrated by recovery of the amplitude of the electric organ discharge, a behavior generated by spinal motoneurons. Computer simulations indicated that the observed rates of apoptotic cell death and cell proliferation can adequately explain the re-growth of the spinal cord.
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Abbreviations
- ANOVA:
-
Analysis of variance
- BrdU:
-
5-bromo-2′-deoxyuridine
- BSA:
-
Bovine serum albumine
- CNS:
-
Central nervous system
- DAPI:
-
4′,6-diamidino-2-phenylindoledihydrochloride
- EOD:
-
Electric organ discharge
- GFAP:
-
Glial fibrillary acidic protein
- PB:
-
Phosphate buffer
- PBS:
-
Phosphate-buffered saline
- SCI:
-
Spinal cord injury
- SD:
-
Standard deviation
- SSC:
-
Saline-sodium citrate (buffer)
- TBS:
-
Tris-buffered saline
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Acknowledgments
This study received financial support from Wilhelm Herbst Stiftung zur Förderung von Kunst und Wissenschaft, Ernst A.-C. Lange-Stiftung, Conrad Naber Stiftung, Tönjes Vagt Stiftung, and Jacobs University Bremen. We thank U. M. Wellbrock for technical assistance and C. Ubilla and M. M. Zupanc for comments on the manuscript. All experiments were performed in accordance with the relevant German law, the Deutsches Tierschutzgesetz, of 1998. All efforts were made to reduce the number of animals used and to minimize animal suffering.
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Sîrbulescu, R.F., Ilieş, I. & Zupanc, G.K.H. Structural and functional regeneration after spinal cord injury in the weakly electric teleost fish, Apteronotus leptorhynchus . J Comp Physiol A 195, 699–714 (2009). https://doi.org/10.1007/s00359-009-0445-4
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DOI: https://doi.org/10.1007/s00359-009-0445-4