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. 1993 May 15;292(Pt 1):253–259. doi: 10.1042/bj2920253

Glycogenolytic and haemodynamic responses to bovine serum albumin in isolated perfused livers from sensitized rats.

D B Buxton 1, O Halvorsen 1, W Zhou 1, M S Olson 1
PMCID: PMC1134297  PMID: 8503854

Abstract

Infusion of BSA into isolated perfused livers of rats sensitized by intraperitoneal injection of BSA led to rapid increases in portal-vein pressure, glucose output and the lactate/pyruvate ratio in the effluent perfusate, with concomitant decreases in oxygen consumption and lactate+pyruvate efflux. The responses were attenuated at low (approximately 7 microM) perfusate Ca2+, but were restored on re-addition of normal Ca2+ concentration. Co-infusion of the cyclo-oxygenase inhibitor ibuprofen (50 microM) or of the platelet-activating factor receptor antagonist WEB 2170 (1.2 microM) inhibited haemodynamic responses to BSA (5 micrograms/ml) by 48% and 59% respectively. Responses to BSA were also attenuated by prior infusion of the beta-adrenergic agonist isoprenaline. Glycogen phosphorylase a activity was increased by 26% in livers freeze-clamped 2 min after onset of BSA infusion; tissue prostaglandin E2 content was increased at 2 min, but returned to control levels at 5 min. Homologous desensitization of hepatic responses to BSA was observed, but heterologous desensitization with heat-aggregated IgG did not take place. It is concluded that livers from rats sensitized to antigen respond directly to subsequent antigen administration by vasoconstriction and glycogenolysis, and that autacoid mediators are involved in these responses.

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Selected References

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