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Evidence for an adenosine receptor in human tissues
Advances in Experimental Medicine and Biology
|January 1, 1984
Summary
Researchers identified high-affinity adenosine receptors in the human placenta using [3H] chloroadenosine. This binding is time-dependent, reversible, and saturable, consistent with known adenosine receptor characteristics.
Area of Science:
- Pharmacology
- Biochemistry
- Human Physiology
Background:
- Adenosine receptors play crucial roles in various physiological processes.
- Characterizing specific adenosine receptor subtypes is essential for understanding their functions.
Purpose of the Study:
- To identify and characterize adenosine binding sites in human placenta.
- To determine if [3H] chloroadenosine can be used to label these sites.
Main Methods:
- Radioligand binding assays using [3H] chloroadenosine.
- Time-course, reversibility, and saturation studies.
- Competition assays with methylxanthine antagonists.
Main Results:
- [3H] chloroadenosine identified binding sites in human placenta.
- Binding exhibited characteristics of high-affinity adenosine receptors.
- Binding was time-dependent, reversible, and saturable.
- The antagonist potency series was consistent with adenosine receptor pharmacology.
Conclusions:
- Human placenta possesses high-affinity adenosine receptors.
- [3H] chloroadenosine is a suitable radioligand for studying these receptors.
- These findings contribute to understanding adenosine receptor distribution and function in placental tissue.