PUBLICATION

Plasticity of tyrosine hydroxylase and serotonergic systems in the regenerating spinal cord of adult zebrafish

Authors
Kuscha, V., Barreiro-Iglesias, A., Becker, C.G., and Becker, T.
ID
ZDB-PUB-110811-38
Date
2012
Source
The Journal of comparative neurology   520(5): 933-951 (Journal)
Registered Authors
Barreiro-Iglesias, Antón, Becker, Catherina G., Becker, Thomas, Kuscha, Veronika
Keywords
regeneration, 5-HT, tyrosine hydroxylase, sonic hedgehog, neurogenesis
MeSH Terms
  • Age Factors
  • Animals
  • Animals, Genetically Modified
  • Neuronal Plasticity/physiology*
  • Serotonergic Neurons/enzymology
  • Serotonergic Neurons/metabolism*
  • Serotonergic Neurons/pathology
  • Spinal Cord Injuries/enzymology
  • Spinal Cord Injuries/metabolism*
  • Spinal Cord Injuries/pathology
  • Spinal Cord Regeneration*/genetics
  • Swimming/physiology
  • Tyrosine 3-Monooxygenase/genetics
  • Tyrosine 3-Monooxygenase/metabolism*
  • Zebrafish
PubMed
21830219 Full text @ J. Comp. Neurol.
Citation
Kuscha, V., Barreiro-Iglesias, A., Becker, C.G., and Becker, T. (2012) Plasticity of tyrosine hydroxylase and serotonergic systems in the regenerating spinal cord of adult zebrafish. The Journal of comparative neurology. 520(5):933-951.
Abstract
Monoaminergic innervation of the spinal cord has important modulatory functions for locomotion. Here we performed a quantitative study to determine the plastic changes of tyrosine hydroxylase positive (TH1+; mainly dopaminergic), and serotonergic (5-HT+) terminals and cells during successful spinal cord regeneration in adult zebrafish. TH1+ innervation in the spinal cord is derived from the brain. After spinal cord transection, TH1+ immunoreactivity is completely lost from the caudal spinal cord. Terminal varicosities increase in density rostral to the lesion site compared to unlesioned controls and are re-established in the caudal spinal cord at 6 weeks post-lesion. Interestingly, axons mostly fail to re-innervate to more caudal levels of the spinal cord even after prolonged survival times. However, densities of terminal varicosities correlate with recovery of swimming behavior, which is completely lost again after re-lesion of the spinal cord. Similar observations were made for terminals derived from descending 5-HT+ axons from the brain. In addition, spinal 5-HT+ neurons were newly-generated after a lesion and transiently increased in number up to 5-fold, which depended in part on hedgehog signaling. Overall, TH1+ and 5-HT+ innervation is massively altered in the successfully regenerated spinal cord of adult zebrafish. Despite these changes in TH and 5-HT systems, a remarkable recovery of swimming capability is achieved, suggesting significant plasticity of the adult spinal network during regeneration.
Genes / Markers
Figures
Expression
Phenotype
Mutations / Transgenics
Human Disease / Model
Sequence Targeting Reagents
Fish
Antibodies
Orthology
Engineered Foreign Genes
Mapping
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