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Endothelin receptor-binding subtypes in the human retina and choroid
1Wilmer Ophthalmological Institute, Johns Hopkins Medical Institutions, Baltimore, Md.
Archives of Ophthalmology (Chicago, Ill. : 1960)
|September 1, 1994
Summary
Endothelin receptor subtypes ETA and ETB are found in different locations within the human and rabbit eye posterior pole. This differential localization suggests roles in ocular vascular and neural functions.
Area of Science:
- Ophthalmology
- Vascular Biology
- Neuroscience
Background:
- Endothelins (ETs) are vasoconstrictive peptides produced by vascular endothelial cells.
- ETs are synthesized in the eye, affecting iris and preretinal vessels.
- Two ET receptor subtypes, ETA and ETB, have been identified.
Purpose of the Study:
- To determine the distribution of endothelin receptor subtypes in the human and rabbit eye.
- To understand the localization of ETA and ETB receptor-binding sites in ocular tissues.
Main Methods:
- Autoradiography was employed using iodine 125-labeled ET-1.
- Varying concentrations of unlabeled ET-3 were used to differentiate receptor subtypes.
- The posterior pole of human and rabbit eyes was analyzed.
Main Results:
- ETA-like receptor-binding sites were found on retinal and choroidal blood vessels.
- ETB-like receptor-binding sites were localized to the neural and glial components of the retina.
- Differential localization of ET receptor subtypes was observed between species.
Conclusions:
- Endothelin receptor subtypes exhibit distinct distributions in the posterior eye.
- ET peptides in the retina and choroid may influence ocular conditions.
- These findings suggest a role in systemic disorders like hypertension.