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Vanweert F, Schrauwen P, Phielix E. Role of branched-chain amino acid metabolism in the pathogenesis of obesity and type 2 diabetes-related metabolic disturbances BCAA metabolism in type 2 diabetes. Nutr Diabetes 2022; 12:35. [PMID: 35931683 PMCID: PMC9356071 DOI: 10.1038/s41387-022-00213-3] [Citation(s) in RCA: 57] [Impact Index Per Article: 28.5] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 12/16/2021] [Revised: 06/15/2022] [Accepted: 07/05/2022] [Indexed: 12/23/2022] Open
Abstract
Branched-chain amino acid (BCAA) catabolism has been considered to have an emerging role in the pathogenesis of metabolic disturbances in obesity and type 2 diabetes (T2D). Several studies showed elevated plasma BCAA levels in humans with insulin resistance and patients with T2D, although the underlying reason is unknown. Dysfunctional BCAA catabolism could theoretically be an underlying factor. In vitro and animal work collectively show that modulation of the BCAA catabolic pathway alters key metabolic processes affecting glucose homeostasis, although an integrated understanding of tissue-specific BCAA catabolism remains largely unknown, especially in humans. Proof-of-concept studies in rodents -and to a lesser extent in humans – strongly suggest that enhancing BCAA catabolism improves glucose homeostasis in metabolic disorders, such as obesity and T2D. In this review, we discuss several hypothesized mechanistic links between BCAA catabolism and insulin resistance and overview current available tools to modulate BCAA catabolism in vivo. Furthermore, this review considers whether enhancing BCAA catabolism forms a potential future treatment strategy to promote metabolic health in insulin resistance and T2D.
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Affiliation(s)
- Froukje Vanweert
- Department of Nutrition and Movement Sciences, NUTRIM, School of Nutrition and Translational Research in Metabolism, Maastricht University Medical Center, Maastricht, The Netherlands
| | - Patrick Schrauwen
- Department of Nutrition and Movement Sciences, NUTRIM, School of Nutrition and Translational Research in Metabolism, Maastricht University Medical Center, Maastricht, The Netherlands
| | - Esther Phielix
- Department of Nutrition and Movement Sciences, NUTRIM, School of Nutrition and Translational Research in Metabolism, Maastricht University Medical Center, Maastricht, The Netherlands.
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Peroxisome Proliferator-Activated Receptors and Caloric Restriction-Common Pathways Affecting Metabolism, Health, and Longevity. Cells 2020; 9:cells9071708. [PMID: 32708786 PMCID: PMC7407644 DOI: 10.3390/cells9071708] [Citation(s) in RCA: 36] [Impact Index Per Article: 9.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/24/2020] [Revised: 07/14/2020] [Accepted: 07/14/2020] [Indexed: 02/06/2023] Open
Abstract
Caloric restriction (CR) is a traditional but scientifically verified approach to promoting health and increasing lifespan. CR exerts its effects through multiple molecular pathways that trigger major metabolic adaptations. It influences key nutrient and energy-sensing pathways including mammalian target of rapamycin, Sirtuin 1, AMP-activated protein kinase, and insulin signaling, ultimately resulting in reductions in basic metabolic rate, inflammation, and oxidative stress, as well as increased autophagy and mitochondrial efficiency. CR shares multiple overlapping pathways with peroxisome proliferator-activated receptors (PPARs), particularly in energy metabolism and inflammation. Consequently, several lines of evidence suggest that PPARs might be indispensable for beneficial outcomes related to CR. In this review, we present the available evidence for the interconnection between CR and PPARs, highlighting their shared pathways and analyzing their interaction. We also discuss the possible contributions of PPARs to the effects of CR on whole organism outcomes.
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Abstract
T1R2-T1R3 is a heteromeric receptor that binds sugars, high potency sweeteners, and sweet taste blockers. In rodents, T1R2-T1R3 is largely responsible for transducing sweet taste perception. T1R2-T1R3 is also expressed in non-taste tissues, and a growing body of evidence suggests that it helps regulate glucose and lipid metabolism. It was previously shown that clofibric acid, a blood lipid-lowering drug, binds T1R2-T1R3 and inhibits its activity in vitro The purpose of this study was to determine whether clofibric acid inhibits sweetness perception in humans and is, therefore, a T1R2-T1R3 antagonist in vivo Fourteen participants rated the sweetness intensity of 4 sweeteners (sucrose, sucralose, Na cyclamate, acesulfame K) across a broad range of concentrations. Each sweetener was prepared in solution neat and in mixture with either clofibric acid or lactisole. Clofibric acid inhibited sweetness of every sweetener. Consistent with competitive binding, inhibition by clofibric acid was diminished with increasing sweetener concentration. This study provides in vivo evidence that the lipid-lowering drug clofibric acid inhibits sweetness perception and is, therefore, a T1R carbohydrate receptor inhibitor. Our results are consistent with previous in vitro findings. Given that T1R2-T1R3 may in part regulate glucose and lipid metabolism, future studies should investigate the metabolic effects of T1R inhibition.
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Affiliation(s)
- Matthew Kochem
- Department of Nutritional Sciences, Rutgers University, 65 Dudley Road, New Brunswick, NJ 08901, USA and
| | - Paul A S Breslin
- Department of Nutritional Sciences, Rutgers University, 65 Dudley Road, New Brunswick, NJ 08901, USA and
- Monell Chemical Senses Center, 3500 Market Street, Philadelphia, PA 19104, USA
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Ramakrishnan SK, Russo L, Ghanem SS, Patel PR, Oyarce AM, Heinrich G, Najjar SM. Fenofibrate Decreases Insulin Clearance and Insulin Secretion to Maintain Insulin Sensitivity. J Biol Chem 2016; 291:23915-23924. [PMID: 27662905 DOI: 10.1074/jbc.m116.745778] [Citation(s) in RCA: 23] [Impact Index Per Article: 2.9] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/28/2016] [Revised: 09/22/2016] [Indexed: 01/18/2023] Open
Abstract
High fat diet reduces the expression of CEACAM1 (carcinoembryonic antigen-related cell adhesion molecule 1), a transmembrane glycoprotein that promotes insulin clearance and down-regulates fatty acid synthase activity in the liver upon its phosphorylation by the insulin receptor. Because peroxisome proliferator-activated receptor α (PPARα) transcriptionally suppresses CEACAM1 expression, we herein examined whether high fat down-regulates CEACAM1 expression in a PPARα-dependent mechanism. By activating PPARα, the lipid-lowering drug fenofibrate reverses dyslipidemia and improves insulin sensitivity in type 2 diabetes in part by promoting fatty acid oxidation. Despite reducing glucose-stimulated insulin secretion, fenofibrate treatment does not result in insulin insufficiency. To examine whether this is mediated by a parallel decrease in CEACAM1-dependent hepatic insulin clearance pathways, we fed wild-type and Pparα-/- null mice a high fat diet supplemented with either fenofibrate or Wy14643, a selective PPARα agonist, and examined their effect on insulin metabolism and action. We demonstrated that the decrease in insulin secretion by fenofibrate and Wy14643 is accompanied by reduction in insulin clearance in wild-type but not Pparα-/- mice, thereby maintaining normoinsulinemia and insulin sensitivity despite continuous high fat intake. Intact insulin secretion in L-CC1 mice with protected hepatic insulin clearance and CEACAM1 levels provides in vivo evidence that insulin secretion responds to changes in insulin clearance to maintain physiologic insulin and glucose homeostasis. These results also emphasize the relevant role of hepatic insulin extraction in regulating insulin sensitivity.
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Affiliation(s)
- Sadeesh K Ramakrishnan
- From the Center for Diabetes and Endocrine Research, College of Medicine and Life Sciences, The University of Toledo, Toledo, Ohio 43614
| | - Lucia Russo
- From the Center for Diabetes and Endocrine Research, College of Medicine and Life Sciences, The University of Toledo, Toledo, Ohio 43614
| | - Simona S Ghanem
- From the Center for Diabetes and Endocrine Research, College of Medicine and Life Sciences, The University of Toledo, Toledo, Ohio 43614
| | - Payal R Patel
- From the Center for Diabetes and Endocrine Research, College of Medicine and Life Sciences, The University of Toledo, Toledo, Ohio 43614
| | - Ana Maria Oyarce
- From the Center for Diabetes and Endocrine Research, College of Medicine and Life Sciences, The University of Toledo, Toledo, Ohio 43614.,the Department of Pharmacology and Experimental Therapeutics College of Pharmacy and Pharmaceutical Sciences, The University of Toledo, Toledo, Ohio 43614, and
| | - Garrett Heinrich
- the Department of Pharmacology and Experimental Therapeutics College of Pharmacy and Pharmaceutical Sciences, The University of Toledo, Toledo, Ohio 43614, and
| | - Sonia M Najjar
- From the Center for Diabetes and Endocrine Research, College of Medicine and Life Sciences, The University of Toledo, Toledo, Ohio 43614, .,the Department of Biomedical Sciences, Heritage College of Osteopathic Medicine, Ohio University, Athens, Ohio 45701
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So WY, Leung PS. Fibroblast Growth Factor 21 As an Emerging Therapeutic Target for Type 2 Diabetes Mellitus. Med Res Rev 2016; 36:672-704. [PMID: 27031294 DOI: 10.1002/med.21390] [Citation(s) in RCA: 57] [Impact Index Per Article: 7.1] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/21/2015] [Revised: 12/13/2015] [Accepted: 02/15/2016] [Indexed: 12/19/2022]
Abstract
Fibroblast growth factor (FGF) 21 is a distinctive member of the FGF family that functions as an endocrine factor. It is expressed predominantly in the liver, but is also found in adipose tissue and the pancreas. Pharmacological studies have shown that FGF21 normalizes glucose and lipid homeostasis, thereby preventing the development of metabolic disorders, such as obesity and diabetes. Despite growing evidence for the therapeutic potential of FGF21, paradoxical increases of FGF21 in different disease conditions point to the existence of FGF21 resistance. In this review, we give a critical appraisal of recent advances in the understanding of the regulation of FGF21 production under various physiological conditions, its antidiabetic actions, and the clinical implications. We also discuss recent preclinical and clinical trials using engineered FGF21 analogs in the management of diabetes, as well as the potential side effects of FGF21 therapy.
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Affiliation(s)
- Wing Yan So
- School of Biomedical Sciences, Faculty of Medicine, the Chinese University of Hong Kong, Shatin, Hong Kong, China
| | - Po Sing Leung
- School of Biomedical Sciences, Faculty of Medicine, the Chinese University of Hong Kong, Shatin, Hong Kong, China
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Integrated physiology and systems biology of PPARα. Mol Metab 2014; 3:354-71. [PMID: 24944896 PMCID: PMC4060217 DOI: 10.1016/j.molmet.2014.02.002] [Citation(s) in RCA: 405] [Impact Index Per Article: 40.5] [Reference Citation Analysis] [Abstract] [Key Words] [Download PDF] [Figures] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 02/05/2014] [Revised: 02/20/2014] [Accepted: 02/21/2014] [Indexed: 12/23/2022] Open
Abstract
The Peroxisome Proliferator Activated Receptor alpha (PPARα) is a transcription factor that plays a major role in metabolic regulation. This review addresses the functional role of PPARα in intermediary metabolism and provides a detailed overview of metabolic genes targeted by PPARα, with a focus on liver. A distinction is made between the impact of PPARα on metabolism upon physiological, pharmacological, and nutritional activation. Low and high throughput gene expression analyses have allowed the creation of a comprehensive map illustrating the role of PPARα as master regulator of lipid metabolism via regulation of numerous genes. The map puts PPARα at the center of a regulatory hub impacting fatty acid uptake, fatty acid activation, intracellular fatty acid binding, mitochondrial and peroxisomal fatty acid oxidation, ketogenesis, triglyceride turnover, lipid droplet biology, gluconeogenesis, and bile synthesis/secretion. In addition, PPARα governs the expression of several secreted proteins that exert local and endocrine functions.
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Abstract
Patients with type-2 diabetes mellitus (T2DM) are considered to be at particularly high risk for cardiovascular disease. Over the last decade, the members of the peroxisome proliferator-activated receptor (PPAR) subfamily of nuclear receptors have emerged as valuable pharmacological targets whose activation can normalize metabolic dysfunctions and reduce some cardiovascular risk factors associated with T2DM. PPARalpha agonists, such as the fibrates, can correct dyslipidemia. PPARgamma agonists, such as the thiazolidinediones, act as insulin sensitizers and improve insulin resistance in patients with T2DM. Because of restricted potency and certain side-effects of PPAR agonists, as well as the increasingly epidemic incidence of T2DM, there is a real need for the development of selective PPAR agonists with improved clinical efficacy. This chapter focuses on the PPAR agonists currently used in the clinic, as well as on the discovery and development of the next generation of PPAR agonists.
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Affiliation(s)
- Barbara Gross
- Institut Pasteur de Lille, 1 rue du Prof Calmette, Lille, F-59019, France
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Lefebvre P, Chinetti G, Fruchart JC, Staels B. Sorting out the roles of PPAR alpha in energy metabolism and vascular homeostasis. J Clin Invest 2006; 116:571-80. [PMID: 16511589 PMCID: PMC1386122 DOI: 10.1172/jci27989] [Citation(s) in RCA: 699] [Impact Index Per Article: 38.8] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/22/2022] Open
Abstract
PPARalpha is a nuclear receptor that regulates liver and skeletal muscle lipid metabolism as well as glucose homeostasis. Acting as a molecular sensor of endogenous fatty acids (FAs) and their derivatives, this ligand-activated transcription factor regulates the expression of genes encoding enzymes and transport proteins controlling lipid homeostasis, thereby stimulating FA oxidation and improving lipoprotein metabolism. PPARalpha also exerts pleiotropic antiinflammatory and antiproliferative effects and prevents the proatherogenic effects of cholesterol accumulation in macrophages by stimulating cholesterol efflux. Cellular and animal models of PPARalpha help explain the clinical actions of fibrates, synthetic PPARalpha agonists used to treat dyslipidemia and reduce cardiovascular disease and its complications in patients with the metabolic syndrome. Although these preclinical studies cannot predict all of the effects of PPARalpha in humans, recent findings have revealed potential adverse effects of PPARalpha action, underlining the need for further study. This Review will focus on the mechanisms of action of PPARalpha in metabolic diseases and their associated vascular pathologies.
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Affiliation(s)
- Philippe Lefebvre
- Département d'Athérosclérose, Institut Pasteur de Lille, INSERM U545, and Université de Lille 2, Lille, France
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Sirtori CR, Calabresi L, Werba JP, Franceschini G. Tolerability of fibric acids. Comparative data and biochemical bases. Pharmacol Res 1992; 26:243-60. [PMID: 1437989 DOI: 10.1016/1043-6618(92)90212-t] [Citation(s) in RCA: 18] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Indexed: 12/27/2022]
Abstract
Fibric acids are an established class of drugs for the treatment of hyperlipoproteinaemias. Although they have been in use for 30 years or longer, some doubts remain as to their relative tolerability, both as a class and as single agents. Some side effects, e.g. lithogenicity, may be related to their mode of action, while others, e.g. the acute muscular syndrome, may be linked to the spatial conformation of the molecule. These disadvantages should, however, be weighed against the additional, potentially therapeutic properties shown by these compounds. In particular, effects on maturity onset diabetes and hyperuricaemia, as well as a very interesting fibrinolytic potential, have been described for some of them. A painstaking comparative analysis of the major literature data pertaining to the clinical toxicological profile of these agents allow to conclude that, while belonging to a chemical class, fibric acids show dramatic differences from one another, in terms of side effects and of additional pharmacodynamic activities. Moreover, in the case of lithogenicity for example, considerable differences exist between normo- and hyperlipidaemic subjects. Overall, newer molecules of more sophisticated design have a significantly improved tolerability profile vs the old clofibrate.
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Affiliation(s)
- C R Sirtori
- Center E. Grossi Paoletti, University of Milano, Italy
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Nishide T, Shirai K, Saito Y, Yoshida S. Modification of intracellular glucose metabolism in human skin fibroblast preincubated with p-chlorophenoxyisobutyrate. Br J Clin Pharmacol 1987; 24:763-7. [PMID: 3125853 PMCID: PMC1386401 DOI: 10.1111/j.1365-2125.1987.tb03243.x] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.0] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/04/2023] Open
Abstract
1. The effect of p-chlorophenoxyisobutyrate (CPIB) on glucose metabolism human skin fibroblasts was examined. 2. CPIB increased the incorporation of 2-deoxy-D-[U-14C]glucose into skin fibroblasts. 3. CPIB decreased [14C]CO2 production from D-[U-14C]glucose but did not affect pyruvate dehydrogenase activity. 4. CPIB reduced fatty acid oxidation activity and cholesterol synthesis but increased triglyceride synthesis. 5. These effects of CPIB were observed both in the presence and in the absence of insulin. 6. One possible mechanism of CPIB on reducing plasma glucose may be due to the increase of glucose incorporation into the cells and triglyceride synthesis in the cells.
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Affiliation(s)
- T Nishide
- The Second Department of Internal Medicine, School of Medicine, Chiba University, Japan
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Raheja KL, Linscheer WG, Patel DG. Hypolipidemic and glycogenolytic effect of clofibrate (CPIB) in hypothyroid mice: role of insulin and glucagon. GENERAL PHARMACOLOGY 1982; 13:49-52. [PMID: 7037529 DOI: 10.1016/0306-3623(82)90010-6] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.0] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 01/23/2023]
Abstract
1. The role of endogenous glucagon and insulin on the hypolipidemic and glycogenolytic effect of clofibrate was determined in the euthyroid and propylthiouracil (PTU)-induced hypothyroid mice. 2. PTU was fed in diet (0.15%) for 2 weeks and then clofibrate added to diet (0.25%) for 4 weeks. 3. Both PTU and clofibrate significantly increased liver weight but had no effect on kidney weight. PTU significantly decreased plasma triglycerides (TG) and increased cholesterol (Ch). 4. Clofibrate had a significant hypotriglyceridemic effect in both euthyroid and hypothyroid mice but did not affect plasma cholesterol. 5. Clofibrate decreased hepatic glycogen in euthyroid but not in hypothyroid mice. 6. Glucose-6-phosphatase activity was not affected by either PTU or clofibrate. 7. Neither PTU nor clofibrate affected hepatic TG or Ch. 8. Biliary lipid changes due to PTU treatment were reversed by clofibrate administration. 9. Since plasma insulin and glucagon levels were not affected by clofibrate in either euthyroid or hypothyroid mice, our results suggest that the hypotriglyceridemic and glycogenolytic effect of clofibrate is not mediated by changes in circulating insulin and glucagon ratio. 10. Moreover, while the glycogenolytic effect of clofibrate seems to be dependent, the hypotriglyceridemic effect seems to be independent of thyroid hormones.
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Calvert GD, Blight L, Franklin J, Oliver J, Wise P, Gallus AS. The effects of clofibrate on plasma glucose, lipoproteins, fibrinogen, and other biochemical and haematological variables in patients with mature onset diabetes mellitus. Eur J Clin Pharmacol 1980; 17:355-62. [PMID: 6998709 DOI: 10.1007/bf00558448] [Citation(s) in RCA: 10] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/22/2023]
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Raheja KL, Lincheer WG, Cho C. Glycogenolytic and hypolipidemic effect of clofibrate (CPIB) in the hypothyroid chick. COMPARATIVE BIOCHEMISTRY AND PHYSIOLOGY. C: COMPARATIVE PHARMACOLOGY 1980; 66:243-7. [PMID: 6107203 DOI: 10.1016/0306-4492(80)90134-3] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 01/18/2023]
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Twomey C, Bloom A. Clofibrate in insulin-dependent diabetes. Ir J Med Sci 1979; 148:31. [DOI: 10.1007/bf02938046] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/30/2022]
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Daubresse JC, Daigneux D, Bruwier M, Luyckx A, Lefebvre PJ. Clofibrate and diabetes control in patients treated with oral hypoglycaemic agents. Br J Clin Pharmacol 1979; 7:599-603. [PMID: 380614 PMCID: PMC1429683 DOI: 10.1111/j.1365-2125.1979.tb04649.x] [Citation(s) in RCA: 5] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/14/2022] Open
Abstract
1. Twenty-two maturity-onset type diabetics treated with oral hypoglycaemic agents entered a single-blind crossover study using placebo (periods A and C, 2 months each) and clofibrate (2 g/day; period B; 2 months). 2. In thirteen patients, under reasonably good control, clofibrate did not reduce fasting or post-prandial blood glucose, nor 24 h glycosuria; no improvement was noted in the M-value, an index of diabetes control. 3. In contrast, in nine patients, with poor diabetes control, clofibrate reduced 24 h glycosuria and significantly improved the M-value. 4. In all patients, clofibrate therapy was associated with a significant 19-23% reduction in plasma fibrinogen. 5. It is suggested that addition of clofibrate may be useful in maturity-onset diabetics not adequately controlled by diet combined with oral hypoglycaemic agents.
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Schade DS, Eaton RP, George S, Conway M, Kaminsky N, Sivinski J. Metabolic effects of clofibrate in insulin-dependent ketosis-prone diabetic man. Metabolism 1978; 27:461-8. [PMID: 416322 DOI: 10.1016/0026-0495(78)90100-2] [Citation(s) in RCA: 7] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Indexed: 12/15/2022]
Abstract
This study examined the effects of clofibrate therapy on basal plasma substrate and hormone concentrations in ketosis-prone insulin-dependent diabetic man. A double-blind crossover design was utilized during a 3-mo period in which clofibrate treatment (1 g b.i.d.) was compared to that of a lactose placebo (1 g b.i.d.). Our results demonstrate that clofibrate treatment resulted in a significant reduction in the concentration of plasma glucose, ketone bodies, free fatty acids, triglyceride, and cholesterol in diabetic man. These beneficial effects were observed without demonstrable changes in circulating concentrations of insulin and glucagon. These observations suggest that in ketosis-prone diabetic man, clofibrate therapy may provide an adjunct to exogenous insulin administration.
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Raheja KL, Tepperman J, Tepperman HM. Effect of oral clofibrate administration on intestinal 3-O-methyl glucose absorption in rat and chick. GENERAL PHARMACOLOGY 1978; 9:113-8. [PMID: 207618 DOI: 10.1016/0306-3623(78)90009-5] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 12/13/2022]
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