Ultrastructural localization of hippocampal TNF-alpha immunoreactive cells in rats following transient global ischemia
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Updated: Aug 9, 2026
2-Vessel Occlusion/Hypotension: A Rat Model of Global Brain Ischemia
Published on: June 22, 2013
1Department of Anatomical Sciences and Neurobiology, School of Medicine, University of Louisville, Louisville, KY 40292, USA. mttsen01@athena.louisville.edu
Insights
Tumor necrosis factor-alpha (TNF-alpha) is present in rat hippocampal neurons after ischemia. Ischemic stress enhances TNF-alpha levels in these neurons, indicating its role in neuronal response to injury.
Area of Science:
- Neuroscience
- Immunology
- Cell Biology
Background:
- Ischemic stroke causes neuronal damage.
- Tumor necrosis factor-alpha (TNF-alpha) is a pro-inflammatory cytokine implicated in various neurological conditions.
- The precise localization and dynamic changes of TNF-alpha in the hippocampus following ischemia are not fully understood.
Purpose of the Study:
- To investigate the cellular localization of TNF-alpha within the rat hippocampus after an ischemic event.
- To determine if ischemic stress alters TNF-alpha expression in hippocampal neurons and glial cells.
Main Methods:
- Utilized a polyclonal antibody against rat TNF-alpha for immunohistochemical analysis.
- Examined hippocampal tissue at various time points up to 72 hours post-ischemia.
- Employed electron microscopy to identify ultrastructural localization of immunoreactive products.
Main Results:
- Identified specific intracellular immunoreactive sites for TNF-alpha in hippocampal pyramidal neurons, including somata and dendrites.
- Observed TNF-alpha immunoreactivity within 72 hours after ischemia.
- Found that astrocytes and microglia showed minimal TNF-alpha immunoreactivity compared to neurons.
Conclusions:
- Demonstrated the presence of TNF-alpha within hippocampal neurons.
- Concluded that ischemic stress enhances TNF-alpha expression in hippocampal neurons.
- Suggests a potential role for neuronal TNF-alpha in the response to ischemic injury.
Abstract:
Using a polyclonal antibody against rat TNF-alpha, we have identified specific intracellular immunoreactive sites in hippocampal pyramidal cells, astroglia, and in microglia within 72 h after a period of ischemia. Electron opaque immunoreactive products in pyramidal cells were found mainly in somata and dendrites. Astrocytes and microglia were nearly devoid of such complexes. These findings demonstrate the presence of TNF-alpha in hippocampal neurons and its enhancement by ischemic stress.
