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Down-Regulation of Albumin Synthesis in the Rat by Human Recombinant Interleukin-1β or Turpentine and the Response to Nutrients

Rowett Research Institute, Aberdeen, United Kingdom

Margaret A. Mcnurlan, PHD

Rowett Research Institute, Aberdeen, United Kingdom

Ian Grant

Rowett Research Institute, Aberdeen, United Kingdom

Peter J. Garlick, PHD

Rowett Research Institute, Aberdeen, United Kingdom, Department of Surgery, Health Sciences Center, State University of New York at Stony Brook, NY 11794-8191

Background: Inflammatory stimuli and provision of nutrients are important factors regulating both total liver protein synthesis and albumin synthesis. Methods: The influence of interleukin-1β or turpentine injection and a 2-hour infusion of a hypocaloric mixture of glucose and amino acids on the synthesis of total liver protein and albumin was investigated in rats. Total liver protein synthesis was measured by an IV flooding dose of L-[2,6³H]phenylalanine and albumin synthesis was determined from the labeling of immunoprecipitated albumin and expressed both as a fraction of total liver protein synthesis and as an absolute rate. Results: Interleukin-1β or turpentine injection stimulated total liver protein synthesis compared with controls, whereas albumin synthesis, both as a fraction of total liver protein synthesis and as an absolute synthesis rate, decreased. In control animals, the 2-hour IV infusion with glucose and amino acids resulted in a significant increase of total liver protein synthesis. Albumin synthesis as a fraction of total liver protein synthesis was not altered, but increased when expressed as an absolute rate in control animals. However, interleukin-1β or turpentine injection abolished this response of albumin synthesis to nutrient supply. Conclusions: Total liver protein synthesis increases under inflammatory conditions and remains responsive to nutrient supply. In contrast, albumin synthesis decreases under the same conditions and does not seem to be responsive to short-term IV nutrients. (Journal of Parenteral and Enteral Nutrition 19:266-271, 1995)

Journal of Parenteral and Enteral Nutrition, Vol. 19, No. 4, 266-271 (1995)
DOI: 10.1177/0148607195019004266


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