Lens opacification by antioestrogens: tamoxifen vs ICI 182,780

¹Department of Physiology, University of Wales, Cardiff.

|August 1, 1995

Summary

Tamoxifen blocks chloride channels and causes lens clouding, while steroidal ICI 182780 does not. Steroidal antioestrogens may reduce ocular toxicity compared to nonsteroidal ones.

Area of Science:

Ophthalmology
Pharmacology
Cell Biology

Background:

Antioestrogens are used in treating hormone-dependent conditions.
Tamoxifen, a nonsteroidal antioestrogen, has known ocular side effects.
Volume-regulated chloride channels play a role in lens transparency.

Purpose of the Study:

To compare the effects of tamoxifen and ICI 182780 on lens transparency and chloride channels.
To evaluate the potential for ocular toxicity of different antioestrogen classes.

Main Methods:

In vitro studies using bovine lenses.
Electrophysiological recordings of volume-regulated chloride currents in cultured cell lines.
Assessment of lens opacification.

Main Results:

Tamoxifen blocked volume-regulated chloride channels and reduced lens transparency.
Steroidal antioestrogen ICI 182780 did not block these channels in cell lines.
ICI 182780 required higher concentrations to induce lens opacification compared to tamoxifen.

Conclusions:

Nonsteroidal antioestrogens like tamoxifen may pose a higher risk of ocular toxicity.
Steroidal antioestrogens, such as ICI 182780, appear to have a better ocular safety profile.
These findings support the use of steroidal antioestrogens to minimize ocular side effects.

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Related Experiment Videos

Lens opacification by antioestrogens: tamoxifen vs ICI 182,780

Area of Science:

Background:

Purpose of the Study:

Main Methods:

Main Results:

Conclusions:

Related Concept Videos

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