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β2-Adrenergic agonist regulation of immune aggregate- and platelet-activating factor-stimulated hepatic metabolism
Journal article   Open access   Peer reviewed

β2-Adrenergic agonist regulation of immune aggregate- and platelet-activating factor-stimulated hepatic metabolism

Mark E Steinhelper, Rory A Fisher, G E Revtyak, Donald J Hanahan and M S Olson
The Journal of biological chemistry, Vol.264(19), pp.10976-10981
07/05/1989
DOI: 10.1016/S0021-9258(18)60414-4
PMID: 2544577
url
https://doi.org/10.1016/S0021-9258(18)60414-4View
Published (Version of record) Open Access

Abstract

Vasoconstriction and subsequent glycogenolysis stimulated by immune complex infusion into perfused rat livers was inhibited by prior infusion of isoproterenol. Similarly, isoproterenol inhibited the biosynthesis of bioactive lipid autacoids such as platelet-activating factor, prostaglandin E2, and thromboxane B2 which was stimulated by immune aggregates. The adrenergic receptor specificity of these effects was determined through the use of specific adrenergic subtype-specific agonists and antagonists to be mediated by beta 2-adrenergic receptors. Indirect evidence for the differential expression of hepatic sinusoidal and parenchymal beta-adrenergic receptors in the male rat during ontogeny suggested that inhibition of immune aggregate-stimulated autacoid biosynthesis, vasoconstriction, and glycogenolysis by isoproterenol occurs at a sinusoidal locus, most likely Kupffer cells. In contrast with the ability of beta 2-adrenergic agonists to inhibit immune aggregate- and platelet-activating factor-stimulated hepatic metabolism, dibutyryl cyclic AMP did not mimic these sinusoidal beta 2-adrenergic effects, despite stimulating hepatic parenchymal cell glycogenolysis as effectively as isoproterenol. These observations suggest a role for cyclic AMP-independent mechanisms in the regulation of heterologous stimulus-response coupling by hepatic sinusoidal beta 2-adrenergic receptors.
Dinoprostone - biosynthesis Liver - metabolism Platelet Activating Factor - biosynthesis Platelet Activating Factor - pharmacology Vasoconstriction Rats Male Receptors, Adrenergic, beta - physiology Thromboxane B2 - biosynthesis Rats, Inbred Strains Antigen-Antibody Complex - physiology Liver - blood supply Animals Glycogen - metabolism Liver - drug effects Isoproterenol - pharmacology Bucladesine - pharmacology

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