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Hippocampal slices from prion protein null mice: disrupted Ca(2+)-activated K+ currents
S B Colling1, J Collinge, J G Jefferys
1Department of Physiology and Biophysics, St Mary's Hospital Medical School, Imperial College, London, UK.
Neuroscience Letters
|May 3, 1996
Summary
Mice lacking prion protein (PrP-null) show altered hippocampal CA1 pyramidal cell properties, specifically disrupted calcium-activated potassium currents (IAHP). These findings suggest a role for prion protein in regulating neuronal excitability.
Area of Science:
- Neuroscience
- Prion Biology
- Cellular Electrophysiology
Background:
- Prion protein (PrP) is implicated in various neurological functions.
- Hippocampal CA1 pyramidal cells are crucial for learning and memory.
- Altered neuronal excitability can contribute to neurological dysfunction.
Purpose of the Study:
- To investigate the intrinsic electrophysiological properties of hippocampal CA1 pyramidal cells in mice lacking prion protein (PrP-null).
- To determine if the absence of PrP affects neuronal excitability and ion channel function.
Main Methods:
- Electrophysiological recordings were performed on hippocampal CA1 pyramidal cells from PrP-null and control mice.
- Key intrinsic properties such as resting potential, input resistance, and action potential characteristics were measured.
Main Results:
- PrP-null mice exhibited normal resting potentials, time constants, and spike firing accommodation compared to controls.
- However, PrP-null mice showed significantly lower input resistances.
- A notable absence of the late afterhyperpolarization (AHP) and charybdotoxin-sensitive summated AHP was observed in PrP-null mice.
Conclusions:
- The absence of PrP disrupts calcium-activated potassium currents (IAHP) in hippocampal CA1 pyramidal cells.
- These findings suggest that PrP plays a role in modulating neuronal excitability through its influence on specific ion channels.