Mechanically gated currents in mouse sensory neurons lacking PIEZO2

Area of Science:

• Neuroscience
• Cell Biology
• Biophysics

Background:

• Touch sensation relies on mechanosensitive ion channels in skin mechanoreceptors.
• The PIEZO2 channel is known to be essential for certain low-threshold mechanoreceptors and rapidly adapting (RA) currents.

Purpose of the Study:

• To quantitatively investigate the role of PIEZO2 in mediating mechanically gated currents in sensory neurons.
• To determine if PIEZO2 is the sole channel responsible for RA currents.

Main Methods:

• Characterization of mechanically gated currents in embryonic and postnatal sensory neurons from global Piezo2 knockout and conditional knockout mice.
• Quantitative analysis of current sensitivity, incidence, and kinetics upon substrate deflection.

Main Results:

• PIEZO2 gene deletion did not significantly reduce the overall sensitivity or incidence of mechanosensitive currents.
• A moderate decrease in the incidence of very fast-activating and inactivating RA currents was observed in Piezo2-deficient neurons.
• These findings indicate that other mechanosensitive channels contribute to RA currents.

Conclusions:

• PIEZO2 channels are not exclusively responsible for all RA currents in sensory neurons.
• Loss of PIEZO2 function may have secondary effects on sensory neuron development, influencing observed phenotypes.
• Further research is needed to understand the diverse roles of mechanosensitive ion channels in sensory neurons.