The binding characteristics of beta-adrenergic ligand [3H]-dihydroalprenolol (DHA) were determined in particulate membranes of early human placenta (8 - 12 weeks of gestation). [3H]-DHA binding to crude membrane fractions was rapid, reversible, saturable and linearly correlated with the membrane protein concentration. Scatchard analysis of saturation experiments showed a KD of 2.80 ± 0.9 nM and a density of binding sites of 330.30 ± 93.5 fmol/mg protein. Agonist potency isoproterenol epinephrine norepinephrine indicated that early human placenta contains an adrenergic receptor of beta-2 subtype.
ASJC Scopus subject areas
- Biochemistry, Genetics and Molecular Biology(all)
- Pharmacology, Toxicology and Pharmaceutics(all)