Mechanical Brain Injury Increases Cells’ Production of Cystathionine β-Synthase and Glutamine Synthetase, but Reduces Pax2 Expression in the Telencephalon of Juvenile Chum Salmon, Oncorhynchus keta

Autor: E. V. Pushchina, Eva I. Zharikova, A. A. Varaksin
Jazyk: angličtina
Rok vydání: 2021
Předmět:
Telencephalon
PAX6 Transcription Factor
radial glia
Neuroepithelial Cells
Excitotoxicity
medicine.disease_cause
lcsh:Chemistry
Neural Stem Cells
Hydrogen Sulfide
Sonic hedgehog
lcsh:QH301-705.5
Spectroscopy
Neurons
biology
Cerebrum
traumatic brain injury
Neurogenesis
Glutamate receptor
cystathionine β-synthase
glutamine synthetase
Cell Differentiation
General Medicine
NPCs
Neural stem cell
Computer Science Applications
Cell biology
Neuroepithelial cell
adult neurogenesis
Adult Stem Cells
Oncorhynchus keta
medicine.anatomical_structure
Brain Regeneration
Pacific chum salmon
Neuroglia
Fish Proteins
Cystathionine beta-Synthase
Glutamic Acid
Neuroprotection
Article
Catalysis
Inorganic Chemistry
Paired Box2
Glutamate-Ammonia Ligase
sonic hedgehog signaling
medicine
Animals
Hedgehog Proteins
Physical and Theoretical Chemistry
Molecular Biology
Cell Proliferation
aNSCs
PAX2 Transcription Factor
Organic Chemistry
Gene Expression Regulation
lcsh:Biology (General)
lcsh:QD1-999
Brain Injuries
biology.protein
Zdroj: International Journal of Molecular Sciences, Vol 22, Iss 1279, p 1279 (2021)
International Journal of Molecular Sciences
Volume 22
Issue 3
ISSN: 1661-6596
1422-0067
Popis: The considerable post-traumatic brain recovery in fishes makes them a useful model for studying the mechanisms that provide reparative neurogenesis, which is poorly represented in mammals. After a mechanical injury to the telencephalon in adult fish, lost neurons are actively replaced due to the proliferative activity of neuroepithelial cells and radial glia in the neurogenic periventricular zone. However, it is not enough clear which signaling mechanisms are involved in the activation of adult neural stem cells (aNSC) after the injury (reactive proliferation) and in the production of new neurons (regenerative neurogenesis) from progenitor cells (NPC). In juvenile Pacific salmon, the predominant type of NSCs in the telencephalon are neuroepithelial cells corresponding to embryonic NSCs. Expression of glutamine synthetase (GS), a NSC molecular marker, was detected in the neuroepithelial cells of the pallium and subpallium of juvenile chum salmon, Oncorhynchus keta. At 3 days after a traumatic brain injury (TBI) in juvenile chum salmon, the GS expression was detected in the radial glia corresponding to aNSC in the pallium and subpallium. The maximum density of distribution of GS+ radial glia was found in the dorsal pallial region. Hydrogen sulfide (H2S) is a proneurogenic factor that reduces oxidative stress and excitotoxicity effects, along with the increased GS production in the brain cells of juvenile chum salmon. In the fish brain, H2S producing by cystathionine β-synthase in neurogenic zones may be involved in maintaining the microenvironment that provides optimal conditions for the functioning of neurogenic niches during constitutive neurogenesis. After injury, H2S can determine cell survivability, providing a neuroprotective effect in the area of injury and reducing the process of glutamate excitotoxicity, acting as a signaling molecule involved in changing the neurogenic environment, which leads to the reactivation of neurogenic niches and cell regeneration programs. The results of studies on the control of the expression of regulatory Sonic Hedgehog genes (Shh) and the transcription factors Paired Box2 (Pax2) regulated by them are still insufficient. A comparative analysis of Pax2 expression in the telencephalon of intact chum salmon showed the presence of constitutive patterns of Pax2 expression in neurogenic areas and non-neurogenic parenchymal zones of the pallium and subpallium. After mechanical injury, the patterns of Pax2 expression changed, and the amount of Pax2+ decreased (p <
0.05) in lateral (Dl), medial (Dm) zones of the pallium, and the lateral zone (Vl) of the subpallium compared to the control. We believe that the decrease in the expression of Pax2 may be caused by the inhibitory effect of the Pax6 transcription factor, whose expression in the juvenile salmon brain increases upon injury.
Databáze: OpenAIRE
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