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Competition by estrogens for catecholamine receptor binding in vitro

C M Paden, B S McEwen, J Fishman

Journal of Neurochemistry

|August 1, 1982

Summary

Estrogens, particularly 2-hydroxyestradiol, can interact with specific catecholamine receptors in the brain, including alpha 1-noradrenergic and dopaminergic sites. This interaction shows steroid and receptor specificity, with implications for neuroendocrine function.

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Area of Science:

Neuroendocrinology
Pharmacology
Neuroscience

Background:

Catecholamine receptors play crucial roles in brain function.
Steroid hormones can modulate neuronal activity.
The interaction between steroids and catecholamine receptors is not fully understood.

Purpose of the Study:

To investigate the ability of various steroids to compete for binding to catecholamine receptors.
To identify specific receptor subtypes that recognize steroids.
To explore the potential neuroendocrine relevance of these interactions.

Main Methods:

Radioligand binding assays were performed using rat brain membranes (cerebral cortex, striatum, anterior pituitary).
Various [3H]-labeled catecholamine receptor ligands were used, including those for alpha-noradrenergic, beta-noradrenergic, and dopaminergic receptors.

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The competitive binding of different steroids, including 17 beta estrogens, progesterone, testosterone, and corticosterone, was assessed.

Main Results:

17 beta estrogens effectively competed for binding to specific receptors.
Estrogens reduced binding of [3H]spiperone and [3H]ADTN (dopaminergic) in the striatum and [3H]WB4101 and [3H]prazosin (alpha 1-noradrenergic) in the cerebral cortex.
2-hydroxyestradiol was the most potent estrogen, showing comparable affinity to norepinephrine for alpha 1 receptors and lower affinity for dopamine receptors.

Conclusions:

Specific catecholamine receptors, namely alpha 1-noradrenergic and dopaminergic sites, recognize estrogens.
Steroid interactions with these receptors exhibit specificity in terms of both steroid structure and receptor type.
These findings suggest a potential role for steroid-catecholamine receptor interactions in neuroendocrine regulation.