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Inward rectification in rat nucleus accumbens neurons
N Uchimura1, E Cherubini, R A North
1Vollum Institute, Oregon Health Sciences University, Portland 97201.
Journal of Neurophysiology
|December 1, 1989
Summary
Neurons in the rat nucleus accumbens septi exhibit inward rectifier potassium currents. These currents contribute significantly to the resting membrane potential and conductance of these neurons.
Area of Science:
- Neuroscience
- Electrophysiology
- Molecular Biology
Background:
- The nucleus accumbens septi plays a crucial role in reward processing and motivation.
- Understanding neuronal membrane properties is essential for deciphering neural circuit function.
Purpose of the Study:
- To investigate the properties of ion channels contributing to the resting membrane potential in nucleus accumbens neurons.
- To characterize the inward currents present in these neurons using electrophysiological techniques.
Main Methods:
- Intracellular recordings from rat nucleus accumbens neurons.
- Single-electrode voltage-clamp to measure membrane currents.
- Application of barium, strontium, cesium, and rubidium to block specific ion conductances.
Main Results:
- Nucleus accumbens neurons possess a voltage-dependent membrane conductance, with higher conductance at more negative potentials.
- Barium ions significantly blocked inward currents and reduced inward rectification in a dose-dependent manner.
- Strontium, cesium, and rubidium also inhibited inward rectification, suggesting a potassium-based inward rectifier current.
Conclusions:
- The study concludes that nucleus accumbens neurons possess a potassium conductance with characteristics of an inward rectifier.
- This inward rectifier potassium conductance plays a significant role in establishing the resting membrane potential and conductance of these neurons.