Temperature effects on membrane potential and input resistance in rat hypothalamic neurones

Area of Science:

• Neuroscience
• Physiology

Background:

• Neuronal thermosensitivity is crucial for thermoregulation.
• The role of membrane potential changes in neuronal thermosensitivity is debated.

Purpose of the Study:

• To investigate if thermal changes in membrane potential contribute to neuronal thermosensitivity in rat hypothalamic slices.

Main Methods:

• Whole-cell and intracellular recordings were performed on rat hypothalamic neurons.
• Membrane potential and input resistance were measured under varying temperatures.

Main Results:

• Warm-sensitive neurons increased firing rates with temperature but showed no change in resting membrane potential.
• Temperature affected input resistance in all neuron types, but not resting membrane potential.
• Thermally induced input resistance changes can artifactually alter recorded membrane potentials.

Conclusions:

• Physiological changes in resting membrane potential do not determine neuronal warm sensitivity.
• Thermal changes in input resistance do not explain the primary differences between warm-sensitive and temperature-insensitive hypothalamic neurons.