Intracellular recordings from salamander olfactory receptor cells

Area of Science:

• Olfactory neurobiology
• Cellular electrophysiology

Background:

• Olfactory receptor cells (ORCs) are crucial for detecting odors.
• Understanding the electrical properties of ORCs is key to deciphering olfactory processing.

Purpose of the Study:

• To investigate the electrophysiological responses of salamander ORCs to olfactory stimulation.
• To characterize changes in membrane potential, input resistance, and spike generation during odorant detection.

Main Methods:

• Intracellular recordings were performed on salamander olfactory receptor cells.
• Antidromic stimulation of olfactory fibers confirmed neuronal impalement.
• Cells were subjected to varying intensities of olfactory stimulation.

Main Results:

• Mean resting potential was -56 mV; spontaneous activity was generally low (<2 Hz).
• Olfactory stimulation induced a graded hyperpolarization (up to 28 mV) and decreased input resistance.
• Increased stimulation intensity led to higher firing frequencies (up to 25 Hz) and reduced spike amplitude, with a two-stage depolarization observed.

Conclusions:

• Olfactory stimulation in salamander ORCs elicits complex electrical responses, including changes in membrane potential and firing patterns.
• These findings provide insights into the mechanisms of olfactory signal transduction and neuronal excitability.