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PubMed1975

[Breath acetone and ketonemia in normal- and overweight subjects during total fasting (author's transl)].

In subjects of ideal weight (7 males and 7 females) total whole blood ketones and breath acetone were determined during a 6 day fast, and in obese subjects (8 males, 18 females) during 6-28 days of fasting. Development of starvation ketosis was significantly slower in overweight than in normal weight subjects. Breath acetone concentration was up to blood ketone levels of 4 mMol/1 a linear function of the blood ketone concentration, beyond that level, however, an additional exponential component became apparent. The highest acetone elimination found was 4.46 mg/min, corresponding to 6.4 g acetone and 11.2 g acetoacetic acid in 24 hours. Hence the decarboxylation of acetoacetic acid to acetone may be an additional mechanism for the lowering of ketoacidosis in starvation.

Acetone↗

PubMed1984

Clinical evaluation of ketone bodies in body fluids of cows in late pregnancy and their fetuses.

Ketone body concentrations were determined in six body fluids of cows in late pregnancy and their fetuses (blood plasma and urine of cows, amniotic and allantoic fetal fluids, and fetal blood serum and urine) using the head-space gas chromatographic method. Physiological ratios O/T% of oxidized (acetone and acetoacetic acid) to total (acetone, isopropanol, acetoacetic and 3-hydroxybutyric acid) ketone bodies were below 10% in cow blood plasma and urine, fetal serum and urine, and allantoic fluid, and below 20% in amniotic fluid. A scheme for the evaluation of the degree and duration of ketosis based on the O/T% ratio is proposed. The existence of a renal regulatory mechanism for excretion of ketone bodies is suggested by analogy with the renal acidobasic regulation.

Allantoin↗

PubMed1998

The metabolism and n-6/n-3 ratio of essential fatty acids in rats: effect of dietary arachidonic acid and a mixture of sesame lignans (sesamin and episesamin).

In this study, we examined the effect of dietary arachidonic acid (AA) and sesame lignans on the content and n-6/n-3 ratio of polyunsaturated fatty acid (PUFA) in rat liver and the concentrations of triglyceride (TG) and ketone bodies in serum. For 4 wk, rats were fed two types of dietary oils: (i) the control oil diet groups (CO and COS): soybean oil/perilla oil = 5:1, and (ii) the AA-rich oil group (AO and AOS): AA ethyl esters/palm oil/perilla oil = 2:2:1, with (COS and AOS) or without (CO and AO) 0.5% (w/w) of sesame lignans. Dietary AA and sesame lignans significantly affected hepatic PUFA metabolism. AA content and n-6/n-3 ratio in the liver were significantly increased in the AO group, despite the dietary total of n-6 PUFA being the same in all groups, while AOS diet reduced AA content and n-6/n-3 ratio to a level similar to the CO and COS groups. These results suggest that (i) dietary AA considerably affects the hepatic profile and n-6/n-3 ratio of PUFA, and (ii) dietary sesame lignans reduce AA content and n-6/n-3 ratio in the liver. In the AO group, the concentration of acetoacetate was significantly increased, but the ratio of beta-hydroxybutyrate/acetoacetate was decreased. On the other hand, the AO diet increased the concentration of TG in serum by almost twofold as compared to other groups. However, the AOS diet significantly reduced serum TG level as compared to the AO group. In addition, the AOS diet significantly increased the acetoacetate level, but reduced the beta-hydroxybutyrate/acetoacetate ratio. These results suggest that dietary sesame lignans promote ketogenesis and reduce PUFA esterification into TG. This study resulted in two findings: (i) sesame lignans inhibited extreme changes of the n-6/n-3 ratio by reducing hepatic PUFA content, and (ii) the reduction of hepatic PUFA content may have occurred because of the effects of sesame lignans on PUFA degradation (oxidation) and esterification.

Animals↗

PubMed1985

Measurement of acetol in serum.

A method for the derivatization of acetol (1-hydroxyacetone) with 2,4-dinitrophenylhydrazine (DNPH) and for the measurement of the acetol dinitrophenylhydrazone derivative (acetol-DNPH) by high-performance liquid chromatography is presented. The chromatographic separation described here resulted in baseline resolution of the acetol-DNPH peak. Peak integration was proportional to serum acetol concentration over a 5- to 500-nmol/ml range. No other method for the determination of acetol in serum currently exists. Serum from rats in diabetic ketoacidosis was found to contain 11.2 +/- 1.1 nmol acetol/ml serum (N = 3). Serum from a 21-day-fasted human contained 16 nmol/ml acetol. Serum from rats maintained on drinking water containing 1% acetone (v:v) for 6 days contained 152 +/- 31 nmol/ml acetol (N = 5). The presence of acetol in serum under conditions where acetoacetate and acetone are chronically elevated suggests that acetoacetate may be converted to glucose through the conversion of acetone to acetol and L-1,2-propanediol.

Acetone↗

PubMed1986

Induction of succinyl-coenzyme A:3-oxoacid coenzyme A-transferase during differentiation of 3T3-L1 cells.

Differentiation of confluent 3T3-L1 preadipocytes to adipocytes in the presence of dexamethasone and 1-methyl-3-isobutylxanthine for 7 days resulted in a 4-fold increase in the incorporation of acetoacetate-carbon into fatty acids and in the activity of 3-oxoacid CoA-transferase, which catalyzes the first committed step in the conversion of acetoacetate to acetoacetyl-CoA. The increase in enzyme activity was due to an increase in the cellular content of the enzyme, as determined by immunoprecipitation of 3-oxoacid CoA-transferase from 3T3-L1 preadipocytes and adipocytes with rabbit antiserum specific for the rat brain enzyme. The 4-fold increase in enzyme activity was accompanied by a 2.7-fold increase in the average relative rate of synthesis of 3-oxoacid CoA-transferase (between Days 4 and 7). Additionally, the half-life of the enzyme increased 1.9-fold relative to the half-life of total protein, indicating that changes in both synthesis and degradation of 3-oxoacid CoA-transferase are responsible for alterations in its activity. Previous studies on the turnover of other enzymes that are induced during differentiation of 3T3-L1 cells have assigned changes in enzyme synthesis as the primary or sole mechanism for changes in enzyme activity. This report provides the first documentation that both enzyme synthesis and degradation play a role in regulating the enzyme activity of an enzyme during differentiation of 3T3-L1 cells.

1-Methyl-3-isobutylxanthine↗

PubMed1988

Involvement of the ADP/ATP carrier in calcium-induced perturbations of the mitochondrial inner membrane permeability: importance of the orientation of the nucleotide binding site.

Compounds which induce calcium efflux from calcium-loaded mitochondria generally provoke membrane leakiness. The involvement of the ADP/ATP carrier in modification of mitochondrial membrane properties was studied. The addition of impermeant inhibitors of the ADP/ATP carrier, namely carboxyatractylate, palmitoyl coenzyme A (in the absence of carnitine), and pyridoxal 5-phosphate, to calcium-loaded mitochondria triggered the release of accumulated calcium, the leakage of endogenous ADP, and the swelling of mitochondria. Permeant ligands, such as bongkrekic acid or ADP, showed no damaging effect on membrane permeability; in fact, they impeded the membrane perturbation which was induced by the three impermeant effectors. In addition, both bongkrekic acid and ADP were able to cancel the calcium loss and swelling resulting from the oxidation of intramitochondrial pyridine nucleotides by acetoacetate. In acetoacetate-treated mitochondria, the ADP/ATP carrier was shown to be mainly in a c-state conformation (i.e., the nucleotide binding site had an external orientation). It was concluded that induction of membrane leakiness by calcium ions depends on the conformational state of the adenine nucleotide carrier. The ability of intramitochondrial calcium ions to modify membrane properties is determined by the orientation of the nucleotide binding site. Only the c-state conformation allows membrane destabilization. Consequently, all compounds which stabilize the ADP/ATP carrier in the c-state conformation will have a deleterious effect on calcium-loaded mitochondria.

Adenosine Diphosphate↗

PubMed1991

Regulation of fatty acid beta-oxidation in rat heart mitochondria.

In an attempt to elucidate the mechanism by which the rate of fatty acid oxidation is tuned to the energy demand of the heart, the effects of changing intramitochondrial ratios of [acetyl-CoA]/[CoASH] and [NADH]/[NAD+] on the rate of beta-oxidation were studied. When 10 mM L-carnitine was added to coupled rat heart mitochondria to lower the ratio of [acetyl-CoA]/[CoASH], the rate of palmitoylcarnitine beta-oxidation, as measured by the formation of acid-soluble products, was stimulated more than fourfold at state 4 respiration while beta-oxidation at state 3 respiration was hardly affected. Neither oxaloacetate nor acetoacetate, added to mitochondria to lower the [NADH]/[NAD+] ratio, stimulated beta-oxidation. Rates of respiration at states 3 and 4 were unchanged by additions of L-carnitine, oxaloacetate, or acetoacetate. Determinations of intramitochondrial ratios of [acetyl-CoA]/[CoASH] by high performance liquid chromatography yielded values close to 10 for palmitoylcarnitine-supported respiration at state 4 and 2.5 at state 3 respiration. Addition of 10 mM L-carnitine caused a dramatic decrease of these ratios to less than 0.2 at both respiration states. Studies with purified or partially purified enzymes revealed strong inhibitions of 3-ketoacyl-CoA thiolase by acetyl-CoA and of L-3-hydroxyacyl-CoA dehydrogenase by NADH. Moreover, the activity of 3-ketoacyl-CoA thiolase at concentrations of acetyl-CoA and CoASH prevailing at state 3 respiration was 4 times higher than its activity in the presence of acetyl-CoA and CoASH observed at state 4. Altogether, this study leads to the conclusion that the rate of beta-oxidation in heart can be regulated by the intramitochondrial ratio of [acetyl-CoA]/[CoASH] which reflects the energy demand of the tissue. The thiolytic cleavage catalyzed by 3-ketoacyl-CoA thiolase may be the site at which beta-oxidation is controlled by the [acetyl-CoA]/[CoASH] ratio.

3-Hydroxyacyl CoA Dehydrogenases↗

PubMed1983

Correction for metabolic exchange in the calculation of the rate of gluconeogenesis in rats.

The degree by which the rate of gluconeogenesis is underestimated when calculated from the transfer of 14C atoms from circulating precursors to plasma glucose was estimated from the ratio of the specific activity of plasma glucose and blood acetoacetate during the infusion of [2-14C]acetate in rats fasted for 3 days. The specific activity of blood acetoacetate was taken to be equal to that of its only precursor, the acetyl C atoms of hepatocellular AcCoA. These latter are assumed not to be available for the net synthesis of glucose and may be incorporated into the molecule by "metabolic exchange" in the hepatic oxalo-acetate pool only. By this approach 25% of the C atoms of plasma glucose have been estimated to arise from AcCoA. Multiplication by a correction factor H = 1.33 +/- 0.03 is being suggested to compensate for the metabolic exchange of 14C for 12C atoms when the rate of gluconeogenesis is calculated from the transfer of 14C atoms from labeled precursors to glucose.

Animals↗

PubMed1986

The role of the hepatocellular redox state in the hepatic triglyceride accumulation following acute ethanol administration.

The role of the increased hepatocellular redox-state [( NADH]/[NAD+] ratio) as a mechanism underlying hepatic triglyceride deposition after acute ethanol dosing has been investigated in the rat. Following a single dose of ethanol (2 g/kg i.p.) in fasted rats, increases were observed at 1.5 hr in the hepatic [lactate]/[pyruvate] (133%), [3-hydroxybutyrate]/[acetoacetate] (69%) ratios, and the liver triglyceride concentration (129%). At the same time point, ethanol increased radioactivity incorporated into hepatic total lipid and triglyceride, after an injection of [U-14C] palmitic acid, by 76% and 158% respectively. Treatment of animals with Naloxone hydrochloride (2 mg/kg i.p.) at 1.0 hr and 2.5 hr after ethanol abolished these ethanol-mediated redox-state changes, without inhibiting ethanol oxidation or affecting hepatic acetaldehyde levels. This, however, did not prevent completely the triglyceride accumulation in the liver or reverse the enhanced uptake of radio-labelled palmitate caused by ethanol. Administration of sorbitol (3.5 g/kg i.p.) caused 109%, 57% and 200% increases in the hepatic [lactate]/[pyruvate], [3-hydroxybutyrate]/[acetoacetate] ratios and glycerol-3-phosphate concentrations respectively. However, the hepatic triglyceride concentration and the incorporation of [U-14C] palmitic acid into hepatic lipids were not influenced by this treatment. In vitro studies in which rat liver slices were incubated with [1-14C] palmitic acid also indicated that the altered [NADH]/[NAD+] ratio was not responsible for the decreased rate of fatty acid oxidation seen after ethanol administration or after the addition of ethanol to the incubation medium. In conclusion, these experiments indicate that increases in the hepatic [NADH]/[NAD+] ratio resulting from ethanol oxidation may not be directly implicated in the altered hepatic fatty acid utilisation and triglyceride deposition observed after acute ethanol administration in rats.

Acetaldehyde↗

PubMed1990

Interactions between plasticizers and fatty acid metabolism in the perfused rat liver and in vivo. Inhibition of ketogenesis by 2-ethylhexanol.

Rates of ketone body (beta-hydroxybutyrate plus acetoacetate) production by perfused livers from starved rats were decreased about 60% from 39 +/- 2 to 17 +/- 3 mumol/g/hr by 2-ethylhexanol (200 microM), a primary metabolite of the plasticizer diethylhexyl phthalate. Inhibition of ketogenesis by ethylhexanol was dose dependent (half-maximal inhibition occurred with 25 microM) in the presence or absence of 4-methylpyrazole, an inhibitor of alcohol dehydrogenase. Concentrations of beta-hydroxybutyrate relative to acetoacetate (B/A) increased in a step-wise manner from 0.32 to 0.75 in the effluent perfusate when ethylhexanol was infused. In contrast, the B/A ratio decreased in parallel with inhibition of ketone body production when alcohol dehydrogenase was inhibited. Pretreatment of rats with phenobarbital, an inducer of omega and omega-1 hydroxylases, diminished inhibition of ketone body production by low (less than 50 microM) of ethylhexanol. Thus, ethylhexanol is oxidized via phenobarbital-inducible pathways to metabolites which do not inhibit ketogenesis. Studies were conducted to determine the site of inhibition of fatty acid oxidation by ethylhexanol. Rates of ketone body production in the presence of oleate (250 microM), which requires transport of the corresponding CoA compound into mitochondria, were reduced from 80 +/- 6 to 58 +/- 8 mumol/g/hr by ethylhexanol. In contrast, ketone body production from hexanoate, which is activated in the mitochondria, was not affected by ethylhexanol. Basal and oleate-stimulated rates of H2O2 production were not affected by ethylhexanol, indicating that peroxisomal beta-oxidation was not altered by the compound. Based on these data it is concluded that 2-ethylhexanol inhibits beta-oxidation of fatty acids in mitochondria but not in peroxisomes. Treatment of rats with ethylhexanol (0.32 g/kg, i.p.) decreased plasma ketone bodies from 1.6 to 0.8 mM, increased hepatic triglycerides and increased lipid predominantly in periportal regions of the liver lobule. These data indicate that alterations in hepatic fatty acid metabolism in periportal regions of the liver lobule may be early events in peroxisome proliferation.

Animals↗

PubMed1977

Human splanchnic metabolism during diabetic ketoacidosis.

Splanchnic exchange rates of glucose, acetoacetate, beta-hydroxybutyrate, lactate, pyruvate, glycerol, alanine, glutamine, glutamate, free fatty acids, and triglycerides were measured in eight patients during moderate to severe diabetic ketoacidosis. Their arterial glucose concentration was 20.68 (9.80-52.79) mumole/liter and tic glucose release was 0.77 (0.09-2.44) mmole/min. Gluconeogenesis accounted for about one-half of net splanchnic glucose release, assuming quantitative conversion of net splanchnic extracted lactate, pyruvate, glycerol, alanine, and alpha-ketoglutarate equivalents to glucose. Net splanchnic free fatty acid extraction was 0.24 (0.09-0.52) mmole/min. There was a positive correlation between free fatty acid uptake and ketone-body release. Net splanchnic acetoacetate release was 0.50 (0.05-0.92) mmole/min and beta-hydroxybutyrate release was 0.35 (-0.16 to 0.84) mmole/min. Total ketone-body release was 0.84 (0.37-1.61) mmole/min. The wide ranges of net splanchnic glucose and ketone-body production rates show the heterogeneous characteristics of the diabetic patient in ketoacidosis. It is concluded that the hyperglycemia and hyperketonemia of diabetic ketoacidosis is due to the lack of reciprocity among rates of hepatic glycogenlysis, gluconeogenesis, and ketogenesis resulting in inappropriate net splanchnic release of glucose and ketone bodies.

Alanine↗

PubMed1983

The effects of cyclopropane carboxylic acid on hepatic pyruvate metabolism.

The effects of the hypoglycemic agent, cyclopropane carboxylate, on the metabolism of various substrates that enter the mitochondrion via the mitochondrial monocarboxylate transporter were investigated in perfused rat livers. Metabolism of pyruvate, branched-chain alpha-keto acids, acetoacetate and, to a lesser extent beta-hydroxybutyrate, were all inhibited by cyclopropane carboxylate. In addition, the stimulation of pyruvate decarboxylation by beta-hydroxybutyrate at low pyruvate concentrations because of exchange of extramitochondrial pyruvate with intramitochondrially generated acetoacetate, was abolished by cyclopropane carboxylate. Gluconeogenesis from alanine, which is not transported via the monocarboxylate translocator, was not inhibited by low concentrations of cyclopropane carboxylate. Cyclopropane carboxylate also inhibited fatty acid oxidation, as measured by ketone body production. These results support previous findings that the hypoglycemic agent, cyclopropane carboxylate, exerts at least some of its metabolic effects at the level of the mitochondrial monocarboxylate transporter.

Animals↗

PubMed1988

Impact of methionine on net ketoacid production in humans.

An exogenous acid load (NH4Cl) inhibits net ketoacid production in the first week of starvation and the fourth to eighth weeks of ketogenic dieting. To determine whether an acid load produced by amino acid metabolism can similarly modify ketosis, five overweight volunteers ingested methionine (H2SO4), NH4Cl, and NaCl (control), in varying order, each day for seven days during weeks 5 to 8 of hypocaloric ketogenic dieting. During days 5 to 7 of each phase, blood pH, bicarbonate, and pCO2 were stable but lower in the NH4Cl phase (7.32 +/- 0.02, 18.1 +/- 1.2 mmol/L, 35.8 +/- 1.4 mmHg) and the methionine phase (7.33 +/- 0.01, 17.1 +/- 0.9 mmol/L, 34.0 +/- 2.0 mmHg) than in the NaCl phase (7.38 +/- 0.01, 22.3 +/- 0.2 mmol/L, 37.6 +/- 1.6 mmHg), P less than .05. Over this period, blood acetoacetate concentration was lower during the methionine and NH4Cl phases than during NaCl, P less than .05. In addition blood beta-hydroxybutyrate and total ketone-body concentrations were lower in the methionine than NaCl phases, P less than .05. Urinary acetoacetate and beta-hydroxybutyrate excretion fell with both acid loads, P less than .05. Compared with control values, urinary total ketone excretion was suppressed by 67 +/- 10% in the NH4Cl and 89 +/- 3% in the methionine periods. When NaCl was ingested after either of the acid loads, urinary ketone excretion increased by 300% to 700%. Thus, methionine ingestion, which results in an acid challenge equivalent to that of a large protein load, has an impact on net ketoacid production similar to that of NH4Cl.(ABSTRACT TRUNCATED AT 250 WORDS)

Acid-Base Equilibrium↗

PubMed1990

Metabolism of ketone bodies by skeletal muscle in starvation and uncontrolled diabetes.

Previous studies have suggested that skeletal muscle may be responsible for as much as 25% of ketone body (KB) production in poorly controlled diabetes. In the present studies, acetoacetate (AcAc) and beta-hydroxybutyrate production was quantitated in the canine hindlimb from surgically placed arterial and venous catheters in conscious insulin-withdrawn diabetic (n = 5) and 4-day fasted (n = 7) dogs. A two-pool modeling technique, using simultaneous infusions of 13C acetoacetate and 14C beta-hydroxybutyrate (beta OHB) was employed to quantitate total body and hindlimb KB kinetics. Total KB production was 9.4 and 39.3 mumol.kg-1.min-1 in the fasted and diabetic animals, respectively. Hindlimb KB production was negligible in both groups. The two-pool model estimates of hindlimb KB utilization were similar to the values obtained by an arterial-venous difference calculation. In conclusion, the hindlimb does not contribute to de novo synthesis of KBs in either fasted or diabetic dogs. Since species differences in KB metabolism occur, it is possible that muscle may be a site for KB production in humans.

Animals↗

PubMed1986

Mechanism for the oleate stimulation of gluconeogenesis from dihydroxyacetone by hepatocytes from fasted rats.

Oleate stimulates glucose production and concomitantly decreases lactate and pyruvate production by rat hepatocyte suspensions incubated with dihydroxyacetone as substrate. The actions of oleate could be blocked by D-(+)dodecanoylcarnitine, which inhibits transport of the fatty acid into the mitochondria and the subsequent oxidation. beta-Hydroxybutyrate, but not acetoacetate, also stimulated glucose synthesis and inhibited lactate and pyruvate production. Furthermore, both beta-hydroxybutyrate and oleate stimulated oxygen consumption to the same extent. This suggests that oleate stimulates glucose production by the provision of energy subsequent to mitochondrial beta-oxidation of the fatty acids. The content of ATP itself did not appear to be responsible for the effects of oleate. Crossover analysis of the gluconeogenic intermediates implicated a site of oleate action between fructose 1,6-bisphosphate and fructose 6-phosphate, suggesting phosphofructokinase and/or fructose-bisphosphatase as possible regulatory sites. Coupled with the finding that intracellular citrate accumulates upon addition of oleate or beta-hydroxybutyrate, but not acetoacetate, the results suggest that citrate inhibition of phosphofructokinase accounts for the redirection of carbon flow from lactate and pyruvate formation and towards that of glucose.

Animals↗

PubMed1989

Glucose, glutamine and ketone body utilisation by resting and concanavalin A activated rat splenic lymphocytes.

The utilisation of glucose, glutamine, acetoacetate and D-3-hydroxybutyrate were investigated over 72 h of incubation of rat splenic lymphocytes, with and without concanavalin A. Lymphocytes consumed both ketone bodies; acetoacetate was consumed preferentially. The ketone bodies reduced glucose consumption by 30-50%, but had little effect on lactate production. Glutamine uptake was concentration dependent up to 4 mM, and consumption was increased in the presence of concanavalin. Glutamine stimulated glucose consumption and lactate production in both resting and activated cells. Complete oxidation contributed 65% of glucose-derived ATP, but less than 40% of glutamine-derived ATP. Glutamine metabolism makes only a minor contribution to lymphocyte ATP generation.

Adenosine Triphosphate↗

PubMed1985

Ketogenic regulation by certain metabolites in rumen epithelium.

In experiments with rumen epithelium incubated in vitro in the presence of butyrate, the ketogenic effect of glucose was shared by epimeric monosaccharides but not by non-metabolizable analogues. 14C from glucose was not incorporated into ketone bodies. Malate increased ketogenesis from butyrate and decreased its oxidation, pyruvate and NH4+ had the opposite effect, and malonate inhibited both processes. The ketogenic effect of glucose was also effective with isovalerate maintaining the high proportion of acetoacetate which is characteristic of this substrate. Rumen epithelium transformed added acetoacetate into 3-hydroxybutyrate. It is concluded that reducing equivalents produced from glucose and other metabolizable substrates are responsible regulators of ketogenesis from butyrate. The results are discussed in view of the functional role of ruminal ketogenesis.

3-Hydroxybutyric Acid↗

PubMed2005

Acetoacetyl-CoA synthetase gene is abundant in rat adipose, and related with fatty acid synthesis in mature adipocytes.

Acetoacetyl-CoA synthetase (AACS, acetoacetate-CoA ligase, EC 6.2.1.16) is a novel cytosolic ketone body (acetoacetate)-specific ligase, the physiological role of which remains to be elucidated. We examined the expression profiles of AACS mRNA in adult rat tissues, finding that it was particularly abundant in male subcutaneous white adipose tissue after weaning. In white adipose tissue, AACS mRNA was preferentially detected in mature adipocytes but not in preadipocytes. The AACS mRNA expression in primary preadipocytes increased during the adipocyte differentiation. These expression profiles were similar to that of acetyl-CoA carboxylase-1, but not like to that of 3-hydroxy-3-methylglutaryl-CoA reductase. These results suggest that AACS in adipose tissue plays an important role in utilizing ketone body for the fatty acid-synthesis during adipose tissue development.

Adipocytes↗