Pertussis Toxin Uncouples Enkephalin-Mediated Inhibition of Rabbit Luteal Adenylyl Cyclase

  • Joel Abramowitz
  • Bhanu P. Jena


Hormonally responsive adenylyl cyclases are membrane-bound enzyme systems which consist of at least five distinct components: receptors for stimulatory and inhibitory hormones; transducing proteins called Gs and Gi, respectively, which mediate the effects of hormone-occupied receptor and function in a guanine nucleotide- and Mg ion-dependent fashion; and a catalytic component, which produces cAMP (for review on the component nature of adenylyl cyclases, see 1). Previous studies from our laboratory indicate that rabbit corpora lutea contain an adenylyl cyclase system that, in addition to being stimulated by gonadotropin and catecholamines (2,3), is attenuated by guanine nucleotides and enkephalin (4,5) suggesting the presence of Gi. As first demonstrated by Katada and Ui (6,7), one method to substantiate the existence of Gi in a given tissue is to treat the tissue with pertussis toxin and a [P]NAD, demonstrate the [P] ADP-ribosylation of a membrane protein with an Mr of 40–41,000 daltons and show that this treatment uncouples inhibitory receptors linked to adenylyl cyclase. In this study we present such data establishing the existence of Gi in the rabbit corpus luteum.


Adenylate Cyclase Adenylyl Cyclase Cholera Toxin Adenine Nucleotide Guanine Nucleotide 


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Copyright information

© Plenum Press, New York 1989

Authors and Affiliations

  • Joel Abramowitz
    • 1
  • Bhanu P. Jena
    • 1
  1. 1.Department of ZoologyIowa State University of Science and TechnologyArnesUSA

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