Uterine oxytocin receptors in an Australian marsupial, the brushtail possum, Trichosurus vulpecula |
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Authors: | C Sernia J Garcia-Aragon W G Thomas R T Gemmell |
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Institution: | Department of Physiology and Pharmacology, University of Queensland, St. Lucia, Australia. |
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Abstract: | 1. Oxytocin receptors in the uterus of the brushtail possum (T. vulpecula) were characterized by radioreceptor assay and compared with those of the sheep and rat uterus. 2. A single oxytocin binding site was found with an affinity (Kd) and receptor concentration (Ro) of 3.0 +/- 0.8 nmol/l and 200 +/- 60 fmol/mg protein, respectively (SEM; n = 5). The receptor was stable at -20 degrees C; divalent ions were required for optimum binding. 3. Competitive displacement curves with related peptides showed the following order of specificity: vasotocin greater than oxytocin greater than mesotocin = arginine-vasopressin = Thr4, Gly7]-oxytocin greater than lysine-vasopressin = isotocin much greater than d(CH2)5, D-Phe2, Ile4, Ala9-NH2]-AVP. 4. It was concluded that oxytocin receptors in the possum have similar characteristics to those of placental mammals. |
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