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Controlled elevation of intraocular pressure in anesthetized mice
Diana C Lozano1, William O Cepurna1, Elaine C Johnson1
1Oregon Health & Science University, Casey Eye Institute, USA.
Experimental Eye Research
|September 22, 2024
Summary
This study developed a protocol for prolonged anesthesia in mice to study optic nerve axon injury from controlled elevation of intraocular pressure (CEI). Elevated intraocular pressure (IOP) of 50 mmHg or higher for 4 hours caused significant optic nerve damage in mice.
Area of Science:
- Ophthalmology
- Neuroscience
- Animal Models
Background:
- Prolonged anesthesia protocols are crucial for in vivo studies.
- Understanding optic nerve axon injury mechanisms requires reliable experimental models.
Purpose of the Study:
- To establish a protocol for prolonged anesthesia in mice.
- To evaluate optic nerve axon injury following controlled elevation of intraocular pressure (CEI).
Main Methods:
- Mice underwent 4-hour anesthesia with physiological monitoring.
- Intraocular pressure (IOP) was elevated to 20, 30, 50, or 60 mmHg.
- Optic nerve injury was assessed 14 days post-procedure.
Main Results:
- Physiological parameters remained stable during anesthesia.
- Significant optic nerve injury occurred at IOPs of 50 mmHg and 60 mmHg.
- Optic nerve injury correlated positively with IOP, not physiological parameters.
Conclusions:
- A 4-hour CEI protocol with stable physiology can induce optic nerve injury in mice.
- IOP levels of 50 mmHg or greater are critical for inducing damage.
- The study provides a detailed method for IOP elevation and monitoring in mice.
