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Am J Physiol Endocrinol Metab 266: E921-E929, 1994;
0193-1849/94 $5.00
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AJP - Endocrinology and Metabolism, Vol 266, Issue 6 E921-E929, Copyright © 1994 by American Physiological Society

ARTICLES

Acute adaptation of carbohydrate metabolism to decreased arterial PO2

B. A. Zinker, K. Namdaran, R. Wilson, D. B. Lacy and D. H. Wasserman
Department of Molecular Physiology and Biophysics, Vanderbilt University School of Medicine, Nashville, Tennessee 37232-0615.

To assess the interaction of arterial PO2 (PaO2) and glucose metabolism, conscious 18-h-fasted dogs with chronically implanted sampling catheters (carotid artery, iliac vein) and flow probe (external iliac artery) were studied during inspiration of air containing 21 (n = 9), 14 (n = 6), 11 (n = 4), or 8% (n = 5) O2. Isotopic and arteriovenous methods were used to assess carbohydrate metabolism. PaO2 was 103 +/- 3, 64 +/- 4, 45 +/- 4, and 30 +/- 1 mmHg with decreased inspired O2. Although limb O2 delivery was reduced (51 +/- 6, 42 +/- 8, 39 +/- 7, and 34 +/- 5 ml/min), limb O2 uptake was not compromised. Plasma insulin was 9 +/- 1, 8 +/- 2, 14 +/- 2, and 16 +/- 3 microU/ml, and glucagon was 53 +/- 3, 49 +/- 3, 64 +/- 5, and 101 +/- 7 pg/ml with decreasing O2. Plasma epinephrine and cortisol were increased whereas norepinephrine was unaffected. Glycemia was unaffected by reduced O2, whereas hepatic glucose output (14 +/- 1, 19 +/- 3, 21 +/- 1, and 22 +/- 1 mumol.kg-1.min-1) and glucose disappearance (14 +/- 2, 18 +/- 3, 20 +/- 1, and 22 +/- 2 mumol.kg-1.min-1) rose similarly. Limb glucose uptake (LGU) rose (21.5 +/- 4.7, 21.2 +/- 5.6, 30.6 +/- 4.7, and 45.3 +/- 9.7 mumol/min) with decreasing O2 because of greater fractional extraction (0.023 +/- 0.005, 0.024 +/- 0.005, 0.031 +/- 0.004, and 0.043 +/- 0.004). Of the increased LGU, approximately 33 and 67% were metabolized oxidatively and nonoxidatively.(ABSTRACT TRUNCATED AT 250 WORDS)


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