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Contributions by kidney and liver to glucose production in the postabsorptive state and after 60 h of fasting.

  1. K Ekberg,
  2. B R Landau,
  3. A Wajngot,
  4. V Chandramouli,
  5. S Efendic,
  6. H Brunengraber and
  7. J Wahren
  1. Department of Clinical Physiology, Karolinska Hospital, Stockholm, Sweden. kekberg@klinfys.ks.se
    Diabetes 1999 Feb; 48(2): 292-298. https://doi.org/10.2337/diabetes.48.2.292
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    Abstract

    Contributions of renal glucose production to whole-body glucose turnover were determined in healthy individuals by using the arteriovenous balance technique across the kidneys and the splanchnic area combined with intravenous infusion of [U-13C6]glucose, [3-(3)H]glucose, or [6-(3)H]glucose. In the postabsorptive state, the rate of glucose appearance was 11.5 +/- 0.6 micromol x kg(-1) x min(-1). Hepatic glucose production, calculated as the sum of net glucose output (9.8 +/- 0.8 micromol x kg(-1) x min(-1)) and splanchnic glucose uptake (2.2 +/- 0.3 micromol x kg(-1) x min(-1)) accounted for the entire rate of glucose appearance. There was no net exchange of glucose across the kidney and no significant renal extraction of labeled glucose. The renal contribution to total glucose production calculated from the arterial, hepatic, and renal venous 13C-enrichments (glucose M+6) was 5 +/- 2%. In the 60-h fasted state, the rate of glucose appearance was 8.2 +/- 0.3 micromol x kg(-1) x min(-1). Hepatic glucose production, estimated as net splanchnic output (5.8 +/- 0.7 micromol x kg(-1) x min(-1)) plus splanchnic uptake (0.6 +/- 0.3 micromol x kg(-1) x min(-1)) accounted for 79% of the rate of glucose appearance. There was a significant net renal output of glucose (0.9 +/- 0.3 micromol x kg(-1) x min(-1)), but no significant extraction of labeled glucose across the kidney. The renal contribution to whole-body glucose turnover calculated from the 13C-enrichments was 24 +/- 3%. We concluded that 1) glucose production by the human kidney in the postabsorptive state, in contrast to recent reports, makes at most only a minor contribution (approximately 5%) to blood glucose homeostasis, but that 2) after 60-h of fasting, renal glucose production may account for 20-25% of whole-body glucose turnover.

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    Contributions by kidney and liver to glucose production in the postabsorptive state and after 60 h of fasting.
    K Ekberg, B R Landau, A Wajngot, V Chandramouli, S Efendic, H Brunengraber, J Wahren
    Diabetes Feb 1999, 48 (2) 292-298; DOI: 10.2337/diabetes.48.2.292

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    Contributions by kidney and liver to glucose production in the postabsorptive state and after 60 h of fasting.
    K Ekberg, B R Landau, A Wajngot, V Chandramouli, S Efendic, H Brunengraber, J Wahren
    Diabetes Feb 1999, 48 (2) 292-298; DOI: 10.2337/diabetes.48.2.292
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