Mouse Panx1 Is Dispensable for Hearing Acquisition and Auditory Function

Area of Science:

• Neuroscience
• Otolaryngology
• Cell Biology

Background:

• Panthera Onca 1 (Panx1) forms plasma membrane channels in various organs, including the inner ear.
• The precise role of Panx1 in auditory function remains uncertain due to conflicting research findings.

Purpose of the Study:

• To investigate the impact of global Panx1 ablation on auditory function and cochlear physiology.
• To clarify the role of Panx1 in hearing acquisition and maintenance.

Main Methods:

• Utilized a global Panx1 knockout (Panx1-/-) mouse model, including hemizygous (Panx1+/-) and wild-type (WT) siblings.
• Confirmed Panx1 ablation via RT-PCR and Western immunoblotting in cochlea and brain.
• Assessed hearing sensitivity and cochlear function using auditory brainstem response (ABR) and distortion product otoacoustic emission (DPOAE) recordings.

Main Results:

• Hearing sensitivity, cochlear amplifier function, and cochlear nerve function were normal in Panx1+/- and Panx1-/- mice.
• Global Panx1 deletion did not alter connexin expression or gap-junction coupling in the developing organ of Corti.
• Spontaneous intercellular calcium signal (ICS) activity, crucial for hearing acquisition, was unaffected by Panx1 ablation.

Conclusions:

• Panthera Onca 1 (Panx1) is dispensable for hearing acquisition and auditory function in mice.
• These findings resolve conflicting data regarding Panx1's role in the auditory system.