Characterization of angiotensin II binding sites in African Green monkey uterus

The observation that there are significant differences in the concentration, affinity, and specificity of both central nervous system (CNS) and peripheral angiotensin receptors among several different mammalian species, including the African Green monkey, led to the detailed analysis of 125I-angiotensin II binding in the uterus of the African Green monkey. The Bmax for angiotensin receptors in uterine tissue from this species is 56.6 +/- 8.7 fmole per mg protein. The Kd for angiotensin II is .601 +/- .108 nM. The specificity of the receptor is similar to that reported for the uterus of the rat and dog. These results indicate that the angiotensin II receptors, although nearly absent from the CNS of the African Green monkey, are found in the uterus and are very similar to uterine receptors previously characterized in the rat and dog and support the use of these species as appropriate models for studying the biochemistry of angiotensin binding in the uterus.