Detergents modify uveal flow and intraocular pressure.

Area of Science:

• Ophthalmology
• Pharmacology
• Toxicology

Background:

• Detergents are widely used in research and industry.
• Their effects on ocular hemodynamics and intraocular pressure (IOP) are not fully understood.

Purpose of the Study:

• To investigate the effects of various detergents on ocular hemodynamics and IOP in isolated perfused eyes.
• To explore the role of phospholipids in mediating these effects.

Main Methods:

• Intra-arterial administration of detergents (Tween 80, Triton X-100, digitonin, SDS) to isolated perfused eyes of rabbits and cats.
• Assessment of uveal vessel constriction/dilation and IOP changes.
• Evaluation of effects after preconstriction with epinephrine or eserine + acetylcholine (Ach).
• Investigation of mepacrine's influence on detergent-induced effects.

Main Results:

• Most detergents (Tween 80, Triton X-100, digitonin) constricted uveal vessels and increased IOP.
• Sodium dodecyl sulfate (SDS) uniquely lowered IOP.
• Digitonin (Type B) was more potent than Type A detergents.
• Pupil size remained unaffected by the detergents.
• Nonionic detergents caused vasodilation after epinephrine preconstriction, but higher doses increased IOP.
• Preconstriction with eserine + Ach abolished detergent effects on uveal flow and IOP.
• Mepacrine reduced detergent-induced ocular effects, indicating a role for phospholipids.

Conclusions:

• Detergents exert significant, varied effects on ocular hemodynamics and IOP.
• Phospholipid liberation appears to mediate some of these detergent-induced ocular effects.
• Understanding these mechanisms is crucial for safe detergent use in ocular research and potential therapeutic applications.