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The Strathprints institutional repository is a digital archive of University of Strathclyde's Open Access research outputs. Strathprints provides access to thousands of Open Access research papers by University of Strathclyde researchers, including by researchers from the Department of Computer & Information Sciences involved in mathematically structured programming, similarity and metric search, computer security, software systems, combinatronics and digital health.

The Department also includes the iSchool Research Group, which performs leading research into socio-technical phenomena and topics such as information retrieval and information seeking behaviour.

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Isolation and characterization of insulin-stimulated, high-affinity cAMP phosphodiesterases from rat liver

Houslay, M D and Pyne, N J and Cooper, M E (1988) Isolation and characterization of insulin-stimulated, high-affinity cAMP phosphodiesterases from rat liver. Methods in Enzmology, 159. pp. 751-760. ISSN 0076-6879

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Abstract

The ability of glucagon to elevate intracellular cAMP concentrations in hepatocytes is antagonized by insulin.l This effect is achieved through inhibition of adenylate cyclasC and activation of specific cAMP phosphodiesterases. l,3,4 The activation of two specific cAMP phosphodiesterases can readily be assessed using a rapid Percoll gradient fractionation procedure to resolve the various membrane fractions. 1 Both of these enzymes express a high affinity and specificity for cAMP. One of them is a peripheral protein found associated exclusively with the plasma membrane 5 and is activated by its phosphorylation, which is triggered by insulin. 6 The other is associated with an as yet undefined intracellular dense-vesicle fraction.~ The mechanism of its activation has yet to be defined but may involve membrane processing/translocation reactions. 7 The dense-vesicle enzyme can also be activated by glucagon through a process which is distinct from that whereby insulin elicits its activation.