Abstract
Glia activation and neuroinflamation are major factors implicated in the aetiology of most neurodegenerative diseases (NDDs). Several agents and toxins have been known to be capable of inducing glia activation an inflammatory response; most of which are active substances that can cause oxidative stress by inducing production of reactive oxygen species (ROS). Neurogenesis on the other hand involves metabolic and structural interaction between neurogenic and glia cells of the periventricular zone (PVZ); a region around the third ventricle. This study investigates glia activation (GFAP), cell proliferation (Ki-67) and neuronal metabolism (NSE) during neurogenesis and oxidative stress by comparing protein expression in the PVZ against that of the parietal cortex. Adult Wistar Rats were treated with normal saline and 20 mg/Kg KCN for 7 days. The tissue sections were processed for immunohistochemistry to demonstrate glia cells (anti Rat-GFAP), cell proliferation (anti Rat-Ki-67) and neuronal metabolism (anti Rat-NSE) using the antigen retrieval method. The sections from Rats treated with cyanide showed evidence of neurodegeneration both in the PVZ and cortex. The distribution of glia cells (GFAP), Neuron specific Enolase (NSE) and Ki-67 increased with cyanide treatment, although the increases were more pronounced in the neurogenic cell area (PVZ) when compared to the cortex. This suggests the close link between neuronal metabolism and glia activation both in neurogenesis and oxidative stress.
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Abbreviations
- PVZ:
-
Periventricular zone
- GFAP:
-
Glia fibrillary acidic protein
- NSE:
-
Neuron specific enolase
- Ki:
-
67- Antigen Ki-67
- KCN:
-
Potassium Cyanide
- ROS:
-
Reactive oxygen Species
- RNS:
-
Reactive nitrogen species
- NO:
-
Nitric oxide
- ACSF:
-
Accessory cerebrospinal fluid
- BSA:
-
Bovine serum albumin
- DNA:
-
Deoxyribonucleic acid
- DAB:
-
3′3′ Diaminobenzidine Tetrachloride
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Acknowledgments
We acknowledge the contributions of Mr. Madukwe Jonathan of the Department of Histopathology, National Hospital Abuja. We will also like to appreciate Mr. Oso of the Department of Chemical Sciences, Mrs. Olaiya of the Physiology Laboratory, Afe Babalola University for their assistance in regent preparation and treatment of the animals throughout the duration of the experiment.
Conflict of interest
The Authors hereby declare there is no conflict of interest associated with this study or any of the procedures and materials used for the purpose of the study.
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Highlights
1. Structural evidence reveals neuronal damage cytoplasmic fragmentation and loss of axonal projections in neuronal cells for the treatment group
2. Glia activation increased with cyanide treatment and oxidative stress
3. Neuronal metabolism increased both in oxidative stress and neurogenesis as shown by NSE immunopositivity and was more prominent in neurogenic cells of the PVZ both in the control and treatment category
4. Cell proliferation increased in PVZ and parietal cortex with cyanide treatment. The increase was much more prominent in neurogenic cells of the PVZ. The cortical cell increase was found to be glia (GFAP immunopositive) rather than neuronal
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Ogundele, O.M., Omoaghe, A.O., Ajonijebu, D.C. et al. Glia activation and its role in oxidative stress. Metab Brain Dis 29, 483–493 (2014). https://doi.org/10.1007/s11011-013-9446-7
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DOI: https://doi.org/10.1007/s11011-013-9446-7