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Physical Factors Affecting Outflow Facility Measurements in Mice.
Alexandra Boussommier-Calleja1, Guorong Li2, Amanda Wilson1
1Department of Bioengineering Imperial College London, London, United Kingdom.
Investigative Ophthalmology & Visual Science
|January 1, 2016
Summary
Hydration and anterior chamber deepening significantly impact mouse eye outflow measurements. Temperature also influences conventional outflow, suggesting physical factors require careful control in ocular perfusion studies.
Area of Science:
- Ocular Physiology
- Ophthalmology Research
- Mouse Models in Vision Science
Background:
- Mice are vital models for studying conventional outflow physiology.
- Accurate ocular perfusion measurements are crucial for understanding eye conditions.
- Physical factors can influence physiological measurements in ex vivo models.
Purpose of the Study:
- To investigate the impact of hydration on ocular perfusion in mice.
- To determine the effect of temperature on conventional outflow in mouse eyes.
- To assess how anterior chamber deepening influences ocular perfusion measurements.
Main Methods:
- Enucleated C57BL/6 mouse eyes underwent multilevel constant pressure perfusion.
- Hydration effects were tested by perfusing eyes in air versus saline immersion.
- Temperature effects were studied at 20°C and 35°C; anterior chamber deepening was simulated.
Main Results:
- Exposure to air created non-zero pressure-independent outflow, reduced by saline immersion.
- Increasing temperature from 20°C to 35°C increased outflow facility 2.5-fold.
- Perfusion via the anterior chamber, not posterior, caused iris bowing and increased outflow.
Conclusions:
- Inadequate hydration can falsely elevate pressure-independent outflow in mouse eyes.
- Anterior chamber deepening may artifactually increase outflow, influenced by the mouse lens.
- Temperature-dependent metabolic processes affect conventional outflow; physical factors need control.
