Mouse Vestibulo-Ocular Reflex Testing for Otolith Organs and Horizontal Semicircular Canal

Area of Science:

• Neuroscience
• Vestibular System Research
• Animal Models in Research

Background:

• Vestibulo-ocular reflexes (VORs) are crucial for maintaining visual stability during head movements.
• Assessing vestibular function in mice is vital for understanding balance disorders.
• Existing methods for VOR measurement in mice can be invasive or lack standardization.

Purpose of the Study:

• To establish a standardized, noninvasive protocol for measuring VORs in mice.
• To detail the methodology for both angular VOR (aVOR) and off-vertical axis rotation (OVAR) tests.
• To provide a framework for evaluating vestibular deficits in mouse models.

Main Methods:

• Developed a protocol involving eye rotation calibration and a noninvasive mouse immobilization setup.
• Integrated aVOR and OVAR stimulus modes for comprehensive vestibular assessment.
• Included waveform interpretation for deriving VOR values and analyzing horizontal semicircular canal cristae (HSCC) and otolith organ function.

Main Results:

• The protocol enables precise measurement of VORs in mice.
• Integrated aVOR and OVAR modes allow for evaluation of both otolith organs and horizontal semicircular canals.
• Standardized calibration tools facilitate inter-laboratory comparison of results.

Conclusions:

• This methodology offers a standardized and noninvasive approach to assess vestibular function in mice.
• The protocol is suitable for evaluating common vestibular deficits.
• Advancements in VOR measurement are expected to provide deeper insights into HSCC and otolith organ function.