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Hormone effects on the synthesis of alpha(1) (acute-phase) glycoprotein and of albumin by isolated rat hepatocytes in suspension were examined. Insulin, glucagon, cortisol, somatotropin (bovine growth hormone) and tri-iodothyronine were added to achieve physiological concentrations in the medium [Jeejeebhoy, Ho, Greenberg, Phillips, Bruce-Robertson &amp; Sodtke (1975) Biochem. J.146, 141-155]. After periodic additions, there were increases (compared with values for non-hormone-treated suspensions) in the concurrent absolute syntheses of alpha(1) (acute-phase) glycoprotein and of albumin. Trends were detectable after 24h, and significant increases were demonstrated after 48h of incubation (219 and 119% respectively of control values). Manipulation of hormones, by omission from the mixture or by addition of only one or two hormones in various combinations, indicated that for alpha(1) (acute-phase) glycoprotein (which may be representative of some other acute-phase proteins), cortisol was one of the most important hormones involved in the stimulation of synthesis, with glucagon enhancing the effect of cortisol but not being stimulatory by itself. Addition of actinomycin D inhibited this stimulation, suggesting that cortisol might have acted through promotion of RNA synthesis. For albumin, cortisol alone did not stimulate synthesis, but its absence from a hormone mixture significantly decreased synthesis compared with that observed with the complete hormone mixture. Our findings support the possibility that following tissue injury, synthesis of alpha(1) (acute-phase) glycoprotein may be stimulated by the hormonal response to this injury (which response includes elevated blood concentrations of cortisol and glucagon).

Effects of hormones on the synthesis of α1 (acute-phase) glycoprotein in isolated rat hepatocytes