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Effect of Ketone Bodies on Glucose Production and Utilization in the Miniature Pig

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Effect of Ketone Bodies on Glucose Production and Utilization in the Miniature Pig Effect of ketone bodies on glucose production and utilization in the miniature pig. M J Müller, … , U Paschen, H J Seitz J Clin Invest. 1984;74(1):249-261. https://doi.org/10.1172/JCI111408. Research Article The effect of ketone bodies on glucose production (Ra) and utilization (Rd) was investigated in the 24-h starved, conscious unrestrained miniature pig. Infusing Na-DL-beta-OH-butyrate (Na-DL-beta-OHB) and thus shifting the blood pH from 7.40 to 7.56 resulted in a decrease of Ra by 52% and of Rd by 45%, as determined by the isotope dilution technique. Simultaneously, the concentrations of arterial insulin and glucagon were slightly enhanced, whereas the plasma levels of glucose, lactate, pyruvate, alanine, alpha-amino-N, and free fatty acids (FFA) were all reduced. Infusion of Na- bicarbonate, which yielded a similar shift in blood pH, did not mimick these effects. Infusion of equimolar amounts of the ketoacid, yielding a blood pH of 7.35, induced similar metabolic alterations with respect to plasma glucose, Ra, Rd, and insulin; however, plasma alanine and alpha-amino-N increased. Infusing different amounts of Na-DL-beta-OHB resulting in plasma steady state levels of ketones from 0.25 to 1.5 mM had similar effects on arterial insulin and glucose kinetics. No dose dependency was observed. Prevention of the Na-DL-beta-OHB-induced hypoalaninemia by simultaneous infusion of alanine (1 mumol/kg X min) did not prevent hypoglycemia. Infusion of Na-DL-beta-OHB plus insulin (0.4 mU/kg X min) showed no additive effect on the inhibition of Ra. Ketones did not inhibit the insulin-stimulated metabolic clearance rate (MCR) for glucose. Infusion of somatostatin (0.2 micrograms/kg X min) initially […] Find the latest version: https://jci.me/111408/pdf Effect of Ketone Bodies on Glucose Production and Utilization in the Miniature Pig Manfred J. Muller, Ulrich Paschen, and Hans J. Seitz Institut fur Physiologische Chemie, Universitits-Krankenhaus Eppendorf, 2000 Hamburg 20, Federal Republic of Germany As bstract. The effect of ketone bodies on glucose X min) showed no additive effect on the inhibition of production (Ra) and utilization (Rd) was investigated in Ra. Ketones did not inhibit the insulin-stimulated met- the 24-h starved, conscious unrestrained miniature pig. abolic clearance rate (MCR) for glucose. Infusion of so- Infusing Na-DL-3-OH-butyrate (Na-DL-f-OHB) and thus matostatin (0.2 ,ug/kg X min) initially decreased plasma shifting the blood pH from 7.40 to 7.56 resulted in a glucose, Ra, and Rd. which was followed by an increase decrease of Ra by 52% and of Rd by 45%, as determined in plasma glucose and Ra; however, on infusion of so- by the isotope dilution technique. Simultaneously, the matostatin plus Na-DL-3-OHB, hypoglycemia and the concentrations of arterial insulin and glucagon were reduced Ra were maintained. slightly enhanced, whereas the plasma levels of glucose, In the anaesthetized 24-h starved miniature pig, lactate, pyruvate, alanine, a-amino-N, and free fatty acids Na-DL-3-OHB infusion decreased the hepatic exchange (FFA) were all reduced. Infusion of Na-bicarbonate, which for glucose, lactate, and FFA, whereas the exchange for yielded a similar shift in blood pH, did not mimick these glycerol, alanine, and a-amino-N as well as liver perfusion effects. Infusion of equimolar amounts of the ketoacid, rate were unaffected. Simultaneously, portal glucagon and yielding a blood pH of 7.35, induced similar metabolic insulin as well as hepatic insulin extraction rate were alterations with respect to plasma glucose, Ra, Rd, and elevated. Leg exchange for glucose, lactate, glycerol, al- insulin; however, plasma alanine and a-amino-N in- anine, a-amino-N, and FFA were decreased, while ketone creased. body utilization increased. Infusing different amounts of Na-DL-3-OHB resulting Repeated infusion of Na-DL-3-OHB at the fourth, in plasma steady state levels of ketones from 0.25 to 1.5 fifth, and sixth day of starvation in the conscious, un- mM had similar effects on arterial insulin and glucose restrained mini-pig resulted in a significant drop in urinary kinetics. No dose dependency was observed. nitrogen (N)-excretion. However, this effect was mimicked Prevention of the Na-DL-3-OHB-induced hypoala- by infusing equimolar amounts of Na-bicarbonate. In ninemia by simultaneous infusion of alanine (1 ttmol/kg contrast, when only the ketoacid was given, urinary N- X min) did not prevent hypoglycemia. excretion accelerated. Infusion of Na-DL-l-OHB plus insulin (0.4 mU/kg To summarize: (a) Ketone bodies decrease endoge- nous glucose production via an insulin-dependent mech- In conducting the experiments described in this report, the investigators anism; in addition, ketones probably exert a direct in- adhered to the Guiding Principles in The Care And Use Of Animals hibitory action on gluconeogenesis. The ketone body- approved by the Council of The American Physiological Society. The induced hypoalaninemia does not contribute to this effect. facilities are fully accredited by the Gesundheitsbehorde der Freien und (b) The Hansestadt Hamburg, and veterinary supervision of the animals was counterregulatory response to hypoglycemia is supplied for the entire experimental period. reduced by ketones. (c) As a consequence of the decrease Dr. Muller's present address is Medizinische Hochschule Hannover, in Ra, glucose utilization declines during ketone infusion. Abt. Klinische Endokrinologie, D-3000 Hannover 61, Federal Republic (d) The insulin-stimulated MCR for glucose is not affected of Germany. Dr. Paschen's present address is AK Altona, Chirurgische by ketones. (e) Ketones in their physiological moiety do Abteilung, D-2000 Hamburg 50, Federal Republic of Germany. Received for publication 5 July 1983 and in revised form 8 March not show a protein-sparing effect. 1984. Introduction J. Clin. Invest. Ketotic hypoglycemia is the commonest variety of childhood © The American Society for Clinical Investigation, Inc. hypoglycemia and accounts for 30-50% of the cases encountered 0021-9738/84/07/0249/13 $1.00 in western clinical practice (1, 2). It occurs not only in children, Volume 74, July 1984, 249-261 but also in adults (2). Although it is known that ketotic hy- 249 Ketone Bodies and Glucose Turnover poglycemia is not a single disease entity, ketones have been superior, the vena jugularis externa, at the superior bulb of the vena proposed to be in some way causative for hypoglycemia. The jugularis interna, into the portal vein, the main stem of the hepatic vein infusion ofexogenous ketones has been widely used in searching of the left lobe, and via the right vena iliaca interna into the vena for specific roles of ketone bodies in glucose homeostasis. In- femoralis (16, 17). After finishing the operative procedures, the abdomen fusion of Na-DL-f3-OH-butyrate (Na-DL-/3-OHB)' reduced the was closed and experiments were started after a recovery period of 60 rate of hepatic glucose production (3, 4, 5) as well as peripheral min. In these experiments, an increase in serum creatine kinase (up to 70 g/l) and lactate dehydrogenase (up to 240 u/1) was observed. At the glucose uptake and oxidation (3, 5, 6). As to the mechanism end of the experiments, animals were sacrificed, and the position of all responsible for the decrease in hepatic gluconeogenesis, the fol- catheters was verified (16, 17). lowing hypotheses have been put forward: (a) a diminished Experimental procedures. Experiments were performed after a star- hepatic precursor, i.e., alanine supply, possibly due to the pro- vation period of 24 h or up to 10 d. Labeled glucose was given via the posed protein sparing action of ketones (1, 2, 7, 8); (b) ketone vena cava superior, and all other substrates and hormones were given body-induced insulin secretion (5, 9, 10). With respect to the via vena jugularis externa. Patency of all catheters during the experiments reduced muscular amino acid release, recent data demonstrate was maintained by a constant infusion of 0.9% NaCI (0.1-0.2 ml/min); that the ketone-induced hypoalaninemic effect represents an between the experiments, catheters were filled up exactly with a heparin experimental artifact related to the alkalinizing effect of infusing solution (0.1 U/kg body wt). A primed (20 MCi)/continuous (0.20 MCi/ Na-DL-3-OHB (1 1). In fact, on infusing the free ketone acid, a min) infusion of [3-3H] glucose (I mCi/l ml; New England Nuclear Corp., Dreieich, Federal Republic of Germany) was begun to permit rise in plasma alanine was observed; however, blood glucose isotopic determination ofthe rates ofglucose production and utilization. decreased again (1 1). Up to 120 min were allowed for isotope equilibration, steady state was On the other hand, the effect of insulin mediating the ketone- reached usually between -20 min and 0 time as was reflected by the induced hypoglycemia was questioned by some clinical data (1, constancy in the concentration of labeled and unlabeled compounds in 12, 13), e.g., the hypoglycemic action of Na-DL-(3-OHB also the blood. Na-DL-P-OHB (Sigma Chemicals, Munchen, Federal Republic could be demonstrated in diabetics (14). of Germany) was prepared immediately before the experiments as a 4% The present paper sets out to investigate the physiological solution (pH 9.20; osmolality, 940 mosmol/kg H20) in sterile Ringer effect of ketone bodies on glucose homeostasis. Our data clearly solution (Na+, 147.2 mmol/liter; K+, 4.0 mmol/liter; Call, 2.25 mmol/ demonstrate (a) that ketones inhibit hepatic gluconeogenesis, liter; C1-, 155.7 mmol/liter; osmolality, 289 mosmol/kg H20). Using different concentrations of Na-DL-#-OHB, a 2, 4, 8, 12, or 16 g/100 ml (b) that this effect is predominantly mediated by insulin and is solution was prepared; the total infusion volume was 226 ml/180 min independent of the alanine supply, (c) that the counterregulatory or 450 ml/360 min.
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