Related Experiment Videos
The effects of local anaesthetics on retinal function
Vision Research
|January 1, 1982
Summary
Local anesthetics like MS-222 inhibit frog eye dark adaptation by blocking rhodopsin regeneration. This occurs through a complex formation with 11-cis retinal, preventing visual pigment renewal.
Area of Science:
- Biochemistry
- Neuroscience
- Ophthalmology
Background:
- Dark adaptation is crucial for vision recovery in low light.
- Local anesthetics are known to affect cellular processes.
Purpose of the Study:
- To investigate the impact of local anesthetics on the electroretinogram (ERG) during dark adaptation in frog eyecups.
- To elucidate the mechanism by which local anesthetics interfere with rhodopsin regeneration.
Main Methods:
- Frog eyecups were treated with MS-222, benzocaine, and procaine HCl.
- ERG recordings were used to assess dark adaptation.
- Rhodopsin regeneration was measured in situ and in vitro.
- Spectrophotometry was employed to detect drug-retinal interactions.
Main Results:
- Local anesthetics significantly inhibited dark adaptation and c-wave recovery in frog eyecups.
- Rhodopsin regeneration was found to be inhibited by these anesthetics.
- MS-222 formed a complex with 11-cis retinal, suggesting a molecular interaction.
Conclusions:
- Local anesthetics, particularly MS-222, interfere with dark adaptation by inhibiting rhodopsin regeneration.
- A proposed Schiff's base formation between MS-222 and 11-cis retinal blocks rhodopsin recombination, impacting visual function.