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Muscarinic cholinergic receptor subtypes expression by human placenta
S K Tayebati1, M Sabbatini, D Zaccheo
1Sezione di Anatomia Umana, Dipartimento di Scienze Farmacologiche e Medicina Sperimentale, Universita di Camerino, Italy.
Neuroscience Letters
|January 17, 1997
Summary
Researchers investigated muscarinic cholinergic receptors in human placenta using radioligand binding. The study found evidence for four subtypes (M1-M4) of these receptors, suggesting the placenta as a source for studying them.
Area of Science:
- Pharmacology
- Reproductive Biology
- Neuroscience
Background:
- The cholinergic system's presence in the placenta is suggested but receptor expression remains uncharacterized.
- Understanding placental cholinergic receptors is crucial for elucidating the placental cholinergic system's function.
Purpose of the Study:
- To investigate the expression and characteristics of muscarinic cholinergic receptors in human placental tissue.
- To determine the subtypes of muscarinic cholinergic receptors present in the human placenta.
Main Methods:
- Utilized radioligand binding techniques with [3H]N-methyl scopolamine ([3H]NMS) on human placental sections.
- Analyzed binding kinetics, including dissociation constant (Kd) and maximum binding site density (Bmax).
- Performed displacement assays using subtype-selective ligands to identify receptor subtypes.
Main Results:
- [3H]NMS binding was consistent with muscarinic cholinergic receptors, exhibiting time-, temperature-, and concentration-dependence.
- High-affinity binding sites were identified with a Kd of 0.1 +/- 0.03 nM and Bmax of 10.82 +/- 0.09 fmol/mg.
- Analysis indicated the presence of four muscarinic cholinergic receptor subtypes (M1-M4) assayable by radioligand binding.
Conclusions:
- Human placenta expresses muscarinic cholinergic recognition sites, specifically subtypes M1-M4.
- These findings contribute to understanding the significance of the placental cholinergic system.
- The human placenta serves as an accessible source for M1-M4 muscarinic cholinergic receptor subtypes.