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Interferon inhibits synaptic potentiation in rat hippocampus
G D'Arcangelo1, F Grassi, D Ragozzino
1Dipartimento di Medicina Sperimentale e Scienze Biochimiche, Università di Roma Tor Vergata, Italy.
Brain Research
|November 15, 1991
Summary
Rat interferon (IFN) impairs synaptic plasticity, reducing both short-term and long-term potentiation in the hippocampus. These findings suggest interferon may act as a neuromodulator in the mammalian brain.
Area of Science:
- Neuroscience
- Immunology
Background:
- Synaptic plasticity, including short-term potentiation (STP) and long-term potentiation (LTP), is crucial for learning and memory.
- Interferons (IFNs) are cytokines primarily known for their role in immune responses, but their direct effects on neuronal function are less understood.
Purpose of the Study:
- To investigate the effects of rat interferon (IFN) on synaptic transmission and plasticity in the rat hippocampus.
- To explore the potential role of IFN as a neuromodulator in the mammalian brain.
Main Methods:
- Extracellular field potential recordings in rat hippocampal slices.
- Electrically-induced potentiation of synaptic transmission.
- Application of varying concentrations of rat IFN.
- Patch-clamp recordings of neuronal currents in cultured hippocampal neurons.
Main Results:
- Rat IFN (120 U/ml) significantly reduced STP and suppressed LTP in a dose-dependent manner (50-500 U/ml).
- IFN also affected basal synaptic transmission at concentrations ≥250 U/ml.
- In cultured neurons, IFN attenuated N-methyl-D-aspartate-induced currents and altered voltage-activated Ca2+ currents.
Conclusions:
- Rat interferon negatively impacts synaptic plasticity in the hippocampus.
- IFN may function as a neuromodulator, influencing neuronal excitability and synaptic function.
- These findings highlight a potential link between immune signaling and brain function during immune responses.