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Glycogen levels and glycogen catabolism in livers from arthritic rats

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Abstract

Hepatic glycogen catabolism and glycogen levels in rats with chronic arthritis were investigated. At 9:00 a.m., the hepatic glycogen contents of ad libitum fed arthritic and normal rats were 225.5 ± 17.7 and 332.1 ± 28.6 μmol glucosyl units × (g liver)–1, respectively. Food intake of arthritic and normal rats was equal to 100.1 ± 6.7 and 105.0 ± 3.1 mg × (g body w)–1 × (per 24 h)–1, respectively. In isolated perfused livers from normal and arthritic rats the rates of glucose, lactate and pyruvate release were the same when substrate- and hormone-free perfusion was performed. During an infusion period of 20 min glucagon caused an increment in glucose release of 35.3 ± 4.7 μmol × (g liver)–1 in livers from arthritic rats; in the normal condition the corresponding increment was 69.6 ± 5.7 μmol × (g liver)–1. Lactate and pyruvate productions (indicators of glycolysis) were diminished by glucagon in livers from normal rats; in the arthritic condition an initial stimulation was found, followed by a slow decay, which did not result in significant inhibition at the end of the glucagon infusion period (20 min). The actions of cAMP and dibutyryl-cAMP were similar to those of glucagon. It was concluded that livers from arthritic rats show an impaired capacity of releasing glucose under the stimulus of glucagon. This can be partly due to the lower glycogen levels and partly to a smaller capacity of inhibiting glycolysis. Reduction in glycogen levels was not associated with reduction in food intake or failure in the energetic state of the hepatic cells. These changes in glycogen metabolism may be related to reduced gluconeogenic capacity of the livers and/or to production of inflammatory mediators observed in the arthritis disease.

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Authors and Affiliations

  1. Laboratory of Liver Metabolism, University of Maringá, 87020900, Maringá, Brazil

    Z. Fedatto-Júnior, E.L. Ishii-Iwamoto, S.M. Caparroz-Assef, G.E. Vicentini, A. Bracht & A.M. Kelmer-Bracht

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  1. Z. Fedatto-Júnior
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  2. E.L. Ishii-Iwamoto
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  3. S.M. Caparroz-Assef
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  4. G.E. Vicentini
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  5. A. Bracht
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  6. A.M. Kelmer-Bracht
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Correspondence to A.M. Kelmer-Bracht.

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Fedatto-Júnior, Z., Ishii-Iwamoto, E., Caparroz-Assef, S. et al. Glycogen levels and glycogen catabolism in livers from arthritic rats. Mol Cell Biochem 229, 1–7 (2002). https://doi.org/10.1023/A:1017913124084

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