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Legere RM, Taylor DR, Davis JL, Bello K, Parker C, Judd RL, Wooldridge AA. Pharmacodynamic Effects of Pioglitazone on High Molecular Weight Adiponectin Concentrations and Insulin Response After Oral Sugar in Equids. J Equine Vet Sci 2019; 82:102797. [PMID: 31732109 DOI: 10.1016/j.jevs.2019.102797] [Citation(s) in RCA: 6] [Impact Index Per Article: 1.2] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/23/2019] [Revised: 07/17/2019] [Accepted: 09/16/2019] [Indexed: 10/26/2022]
Abstract
Chronic insulin dysregulation is challenging to manage with pharmaceuticals in horses. Pioglitazone improves insulin sensitivity in humans, and the pharmacokinetics of pioglitazone have been evaluated in horses. The objectives of this study were to assess the pharmacodynamic effects of oral pioglitazone on morphometric parameters, hepatic enzyme activity and function, adipokines, and enteroinsular response to oral sugar. A prospective pilot study was performed using fifteen adult equids (8 ponies, 7 horses) to evaluate the effects of short-term pioglitazone administration (2 mg/kg PO q 24 hours, 28 days). Oral sugar tests (OST) were performed before and after treatment. Adipokines were measured at day 0, 14, and 28 of administration. Plasma drug concentrations were measured at day 14 and 28 of administration. The subjects were grouped into horses, ponies, and insulin dysregulated (ID) animals. Baseline values for all parameters were compared with values obtained at day 14 and 28 using one-way or two-way analysis of variance. Mild changes were noted in morphometric parameters and hepatic enzymes. No differences were found in leptin concentrations or the blood glucose response to the OST. Significant decreases were found in the insulin response to OST at 90 and 120 minutes time points and the area under the curve after pioglitazone treatment in the pony and ID groups. High-molecular-weight (HMW) adiponectin concentrations were significantly increased in all groups after pioglitazone treatment. Decreased insulin concentrations in response to oral sugar and increased HMW adiponectin concentrations indicate positive effects of pioglitazone for treatment of metabolic derangements in equine metabolic syndrome, which warrant future clinical study.
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Affiliation(s)
- Rebecca M Legere
- Department of Clinical Sciences, College of Veterinary Medicine, Auburn University, Auburn, AL
| | - Debra R Taylor
- Department of Clinical Sciences, College of Veterinary Medicine, Auburn University, Auburn, AL
| | - Jennifer L Davis
- Department of Biomedical Sciences & Pathobiology, VA-MD College of Veterinary Medicine, Blacksburg, VA
| | - Kaitlyn Bello
- Department of Clinical Sciences, College of Veterinary Medicine, Auburn University, Auburn, AL
| | - Caroline Parker
- Department of Clinical Sciences, College of Veterinary Medicine, Auburn University, Auburn, AL
| | - Robert L Judd
- Department of Anatomy, Physiology and Pharmacology, College of Veterinary Medicine, Auburn University, Auburn, AL
| | - Anne A Wooldridge
- Department of Clinical Sciences, College of Veterinary Medicine, Auburn University, Auburn, AL.
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Yaribeygi H, Simental-Mendía LE, Barreto GE, Sahebkar A. Metabolic effects of antidiabetic drugs on adipocytes and adipokine expression. J Cell Physiol 2019; 234:16987-16997. [PMID: 30825205 DOI: 10.1002/jcp.28420] [Citation(s) in RCA: 21] [Impact Index Per Article: 4.2] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/20/2018] [Revised: 02/05/2019] [Accepted: 02/14/2019] [Indexed: 12/14/2022]
Abstract
Several classes of antidiabetic agents have been developed that achieve their hypoglycemic outcomes via various molecular mechanisms. Adipose tissue is a major metabolic and energy-storing tissue and plays an important role in many metabolic pathways, including insulin signaling and insulin sensitivity. Adipose tissue monitors and regulates whole body homeostasis via production and release of potent proteins, such as adipokine and adiponectin, into the circulation. Therefore, any agent that can modulate adipocyte metabolism can, in turn, affect metabolic and glucose homeostatic pathways. Antidiabetic drugs are not only recognized primarily as hypoglycemic agents but may also alter adipose tissue itself, as well as adipocyte-derived adipokine expression and secretion. In the current review, we present the major evidence concerning routinely used antidiabetic agents on adipocyte metabolism and adipokine expression.
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Affiliation(s)
- Habib Yaribeygi
- Chronic Kidney Disease Research Center, Shahid Beheshti University of Medical Sciences, Tehran, Iran
| | - Luis E Simental-Mendía
- Unidad de Investigación Biomédica, Delegación Durango, Instituto Mexicano del Seguro Social, México, México
| | - George E Barreto
- Departamento de Nutrición y Bioquímica, Facultad de Ciencias, Pontificia Universidad Javeriana, Bogotá D.C, Colombia.,Instituto de Ciencias Biomédicas, Universidad Autónoma de Chile, Santiago, Chile
| | - Amirhossein Sahebkar
- Neurogenic Inflammation Research Center, Mashhad University of Medical Sciences, Mashhad, Iran.,Biotechnology Research Center, Pharmaceutical Technology Institute, Mashhad University of Medical Sciences, Mashhad, Iran.,School of Pharmacy, Mashhad University of Medical Sciences, Mashhad, Iran
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3
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Tanaka A, Komukai S, Shibata Y, Yokoi H, Iwasaki Y, Kawasaki T, Horiuchi K, Nakao K, Ueno T, Nakashima H, Tamashiro M, Hikichi Y, Shimomura M, Tago M, Toyoda S, Inoue T, Kawaguchi A, Node K. Effect of pioglitazone on cardiometabolic profiles and safety in patients with type 2 diabetes undergoing percutaneous coronary artery intervention: a prospective, multicenter, randomized trial. Heart Vessels 2018; 33:965-977. [PMID: 29487991 DOI: 10.1007/s00380-018-1143-3] [Citation(s) in RCA: 9] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 12/06/2017] [Accepted: 02/23/2018] [Indexed: 12/18/2022]
Abstract
Pioglitazone has superior antiatherosclerotic effects compared with other classes of antidiabetic agents, and there is substantial evidence that pioglitazone improves cardiovascular (CV) outcomes. However, there is also a potential risk of worsening heart failure (HF). Therefore, it is clinically important to determine whether pioglitazone is safe in patients with type 2 diabetes mellitus (T2DM) who require treatment for secondary prevention of CV disease, since they have an intrinsically higher risk of HF. This prospective, multicenter, open-label, randomized study investigated the effects of pioglitazone on cardiometabolic profiles and CV safety in T2DM patients undergoing elective percutaneous coronary intervention (PCI) using bare-metal stents or first-generation drug-eluting stents. A total of 94 eligible patients were randomly assigned to either a pioglitazone or conventional (control) group, and pioglitazone was started the day before PCI. Cardiometabolic profiles were evaluated before PCI and at primary follow-up coronary angiography (5-8 months). Pioglitazone treatment reduced HbA1c levels to a similar degree as conventional treatment (pioglitazone group 6.5 to 6.0%, P < 0.01; control group 6.5 to 5.9%, P < 0.001), without body weight gain. Levels of high-molecular weight adiponectin increased more in the pioglitazone group than the control group (P < 0.001), and the changes were irrespective of baseline glycemic control. Furthermore, pioglitazone significantly reduced plasma levels of natriuretic peptides and preserved cardiac systolic and diastolic function (assessed by echocardiography) without incident hospitalization for worsening HF. The incidence of clinical adverse events was also comparable between the groups. These results indicate that pioglitazone treatment before and after elective PCI may be tolerable and clinically safe and may improve cardiometabolic profiles in T2DM patients.
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Affiliation(s)
- Atsushi Tanaka
- Department of Cardiovascular Medicine, Saga University, 5-5-1 Nabeshima, Saga, Japan.
| | - Sho Komukai
- Clinical Research Center, Saga University Hospital, Saga, Japan
| | - Yoshisato Shibata
- Miyazaki Medical Association Hospital, Cardiovascular Center, Miyazaki, Japan
| | - Hiroyoshi Yokoi
- Department of Cardiology, Kokura Memorial Hospital, Kitakyushu, Japan
| | - Yoshihiro Iwasaki
- Department of Cardiology, Nagasaki Kouseikai Hospital, Nagasaki, Japan
| | - Tomohiro Kawasaki
- Department of Cardiology, Cardiovascular Center, Shin-Koga Hospital, Kurume, Japan
| | - Kenji Horiuchi
- Division of Cardiology, Saiseikai Kumamoto Hospital Cardiovascular Center, Kumamoto, Japan
| | - Koichi Nakao
- Division of Cardiology, Saiseikai Kumamoto Hospital Cardiovascular Center, Kumamoto, Japan
| | - Takafumi Ueno
- Division of Cardiovascular Medicine, Department of Internal Medicine, Kurume University School of Medicine, Kurume, Japan
| | - Hitoshi Nakashima
- Department of Cardiology, National Hospital Organization Kagoshima Medical Center, Kagoshima, Japan
| | | | - Yutaka Hikichi
- Department of Cardiovascular Medicine, Saga University, 5-5-1 Nabeshima, Saga, Japan
| | - Mitsuhiro Shimomura
- Department of Cardiovascular Medicine, Saga University, 5-5-1 Nabeshima, Saga, Japan
| | - Motoko Tago
- Department of Cardiovascular Medicine, Saga University, 5-5-1 Nabeshima, Saga, Japan
| | - Shigeru Toyoda
- Department of Cardiovascular Medicine, Dokkyo Medical University, Mibu, Japan
| | - Teruo Inoue
- Department of Cardiovascular Medicine, Dokkyo Medical University, Mibu, Japan
| | | | - Koichi Node
- Department of Cardiovascular Medicine, Saga University, 5-5-1 Nabeshima, Saga, Japan.
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Kawaguchi-Suzuki M, Bril F, Kalavalapalli S, Cusi K, Frye RF. Concentration-dependent response to pioglitazone in nonalcoholic steatohepatitis. Aliment Pharmacol Ther 2017; 46:56-61. [PMID: 28470881 PMCID: PMC5485416 DOI: 10.1111/apt.14111] [Citation(s) in RCA: 12] [Impact Index Per Article: 1.7] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 02/10/2017] [Revised: 03/03/2017] [Accepted: 03/30/2017] [Indexed: 12/13/2022]
Abstract
BACKGROUND Pioglitazone is a safe and effective option to manage patients with type 2 diabetes and nonalcoholic steatohepatitis (NASH). However, there is marked variability in treatment response. AIM To evaluate the relationship between concentrations of pioglitazone and its active metabolites and treatment outcomes in patients with NASH. METHODS Pioglitazone concentrations were measured in patients with NASH treated with pioglitazone 45 mg/day for 18 months; liver biopsy samples were obtained at baseline and after treatment. The primary outcome was a ≥2-point reduction in NAFLD activity score (NAS) with at least one-point improvement in more than one liver histology category and without worsening of fibrosis. A novel marker, the pioglitazone exposure index, was calculated to consider the concentrations of pioglitazone as well as the two active metabolites. RESULTS The response to pioglitazone was concentration-dependent as evidenced by the significant relationship between both pioglitazone concentration and pioglitazone exposure index with changes in NAS (r=.48, P=.0002 and r=.51, P<.0001, respectively), steatosis (r=.41, P=.002 and r=.46, P=.0005), and inflammation (r=.44, P=.0009 and r=.40, P=.0003). The pioglitazone exposure index was also associated with a change in ballooning (P=.04). The pioglitazone exposure index was higher in patients with NASH resolution (2.85±1.38 vs 1.78±1.48, P=.018). A predictive model for the primary outcome was developed that incorporated baseline NAS and pioglitazone exposure index (AUC=0.77). CONCLUSIONS This study demonstrates the importance of pioglitazone exposure to variable response in patients with NASH, and indicates potential factors that may identify patients most likely to benefit from chronic pioglitazone treatment.
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Affiliation(s)
- Marina Kawaguchi-Suzuki
- Department of Pharmacotherapy and Translational Research, University of Florida, Gainesville, FL,Center for Pharmacogenomics, University of Florida, Gainesville, FL,Pacific University School of Pharmacy, College of Health Professions, Hillsboro, OR
| | - Fernando Bril
- Division of Endocrinology, Diabetes and Metabolism, University of Florida, Gainesville, FL
| | - Srilaxmi Kalavalapalli
- Division of Endocrinology, Diabetes and Metabolism, University of Florida, Gainesville, FL
| | - Kenneth Cusi
- Division of Endocrinology, Diabetes and Metabolism, University of Florida, Gainesville, FL,Endocrinology, Diabetes and Metabolism, Malcom Randall VA Medical Center, Gainesville, FL
| | - Reginald F. Frye
- Department of Pharmacotherapy and Translational Research, University of Florida, Gainesville, FL,Center for Pharmacogenomics, University of Florida, Gainesville, FL
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Szabó T, Scherbakov N, Sandek A, Kung T, von Haehling S, Lainscak M, Jankowska EA, Rudovich N, Anker SD, Frystyk J, Flyvbjerg A, Pfeiffer AFH, Doehner W. Plasma adiponectin in heart failure with and without cachexia: catabolic signal linking catabolism, symptomatic status, and prognosis. Nutr Metab Cardiovasc Dis 2014; 24:50-56. [PMID: 23791298 DOI: 10.1016/j.numecd.2013.04.015] [Citation(s) in RCA: 46] [Impact Index Per Article: 4.6] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 12/21/2012] [Revised: 03/05/2013] [Accepted: 04/17/2013] [Indexed: 10/26/2022]
Abstract
BACKGROUND AND AIMS Adiponectin (ADPN) as an adipose tissue hormone contributes to regulation of energy metabolism and body composition and is associated with cardiovascular risk profile parameters. Cardiac cachexia may develop as a result of severe catabolic derangement in chronic heart failure (CHF). We aimed to determinate an abnormal ADPN regulation as a link between catabolic signalling, symptomatic deterioration and poor prognosis. METHODS AND RESULTS We measured plasma ADPN in 111 CHF patients (age 65 ± 11, 90% male, left ventricular ejection fraction (LVEF) 36 ± 11%, peak oxygen consumption (peakVO2) 18.1 ± 5.7 l/kg*min, body mass index (BMI) 27 ± 4 kg/m(2), all mean ± standard deviation) and 36 healthy controls of similar age and BMI. Body composition was assessed by dual energy X-ray absorptiometry, insulin sensitivity was evaluated by homoeostasis model assessment, exercise capacity by spiroergometry. Plasma ADPN did not differ between CHF vs. controls (13.5 ± 11.0 vs. 10.5 ± 5.3 mg/l, p > 0.4), but increased stepwise with NYHA functional class (I/II/III: 5.7 ± 1.4/10.7 ± 8.3/19.2 ± 14.0 mg/l, ANOVA p < 0.01). Furthermore, ADPN correlated with VO2 at anaerobic threshold (r = -0.34, p < 0.05). ADPN was highest in cachectic patients (cCHF, 16%) vs. non-cachectic (ncCHF) (18.7 ± 15.0 vs. 12.5 ± 9.9 mg/l; p < 0.05). ADPN indicated mortality risk independently of established prognosticators (HR: 1.04 95% CI: 1.02-1.07; p < 0.0001). ADPN above the mean (13.5 mg/l) was associated with a 3.4 times higher mortality risk in CHF vs. patients with ADPN levels below the mean. CONCLUSION Circulating ADPN is abnormally regulated in CHF. ADPN may be involved in impaired metabolic signalling linking disease progression, tissue wasting, and poor outcome in CHF.
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Affiliation(s)
- T Szabó
- Applied Cachexia Research, Department of Cardiology, Charite Universitätsmedizin Berlin, Germany
| | - N Scherbakov
- Centre for Stroke Research Berlin, Charite Universitätsmedizin Berlin, Germany
| | - A Sandek
- Applied Cachexia Research, Department of Cardiology, Charite Universitätsmedizin Berlin, Germany
| | - T Kung
- Applied Cachexia Research, Department of Cardiology, Charite Universitätsmedizin Berlin, Germany
| | - S von Haehling
- Applied Cachexia Research, Department of Cardiology, Charite Universitätsmedizin Berlin, Germany
| | - M Lainscak
- Division of Cardiology, University Clinic, Golnik, Slovenia
| | - E A Jankowska
- Department of Heart Diseases, Wroclaw Medical University, Wroclaw, Poland
| | - N Rudovich
- Department of Endocrinology, Diabetes, and Nutritional Medicine, Universitätsmedizin Berlin, Germany
| | - S D Anker
- Centre for Clinical and Basic Research, IRCCS San Raffaele, Rome, Italy
| | - J Frystyk
- Department of Endocrinology and Internal Medicine & the Medical Research Laboratories, Department of Clinical Medicine, Aarhus University, Aarhus, Denmark
| | - A Flyvbjerg
- Department of Endocrinology and Internal Medicine & the Medical Research Laboratories, Department of Clinical Medicine, Aarhus University, Aarhus, Denmark
| | - A F H Pfeiffer
- Department of Endocrinology, Diabetes, and Nutritional Medicine, Universitätsmedizin Berlin, Germany
| | - W Doehner
- Applied Cachexia Research, Department of Cardiology, Charite Universitätsmedizin Berlin, Germany; Centre for Stroke Research Berlin, Charite Universitätsmedizin Berlin, Germany.
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A lower serum level of middle-molecular-weight adiponectin is a risk factor for endometrial cancer. Int J Clin Oncol 2013; 19:667-73. [PMID: 23963826 DOI: 10.1007/s10147-013-0603-0] [Citation(s) in RCA: 15] [Impact Index Per Article: 1.4] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/29/2013] [Accepted: 07/18/2013] [Indexed: 12/15/2022]
Abstract
BACKGROUND The present study was undertaken to examine the correlation between serum levels of adiponectin isoforms and the risk for endometrial cancer. METHODS This retrospective case-control study included 43 Japanese women with endometrial cancer and 62 Japanese women with no history of cancer. Serum levels of total adiponectin and the respective isoforms were determined by enzyme-linked immunosorbent assay. Multivariate logistic regression analysis was performed on the serum levels of total adiponectin and its isoforms, high molecular weight, middle molecular weight, and low molecular weight adiponectins, after adjustment for confounders (age, body mass index, hypertension, and diabetes mellitus). RESULTS The distribution of body mass index revealed a statistically significant difference between patients and controls (P = 0.001). A statistically significant difference (P < 0.01) was also found in the incidence of diabetes mellitus between the two groups, although there was no significant difference in the incidence of hypertension. In controls, an inverse correlation was observed between body mass index and serum adiponectin levels. However, in patients, an inverse correlation was found only between body mass index and serum middle molecular weight adiponectin level. After adjustment for confounding variables, the factor found to be most closely associated with endometrial cancer was a lower serum level of middle molecular weight adiponectin (adjusted odds ratio 4.89, 95 % confidence interval value 1.25-19.11, P = 0.022). CONCLUSION Low serum level of middle molecular weight adiponectin was the only independent risk factor for endometrial cancer suggesting that the application of adiponectin might prevent or decrease the risk for endometrial cancer.
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Kim HJ, Park KS, Lee SK, Min KW, Han KA, Kim YK, Ku BJ. Effects of Pinitol on Glycemic Control, Insulin Resistance and Adipocytokine Levels in Patients with Type 2 Diabetes Mellitus. ANNALS OF NUTRITION AND METABOLISM 2012; 60:1-5. [DOI: 10.1159/000334834] [Citation(s) in RCA: 28] [Impact Index Per Article: 2.3] [Reference Citation Analysis] [Track Full Text] [Subscribe] [Scholar Register] [Received: 01/25/2011] [Accepted: 11/04/2011] [Indexed: 02/04/2023]
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PPAR Gamma: Coordinating Metabolic and Immune Contributions to Female Fertility. PPAR Res 2011; 2008:243791. [PMID: 18309368 PMCID: PMC2246065 DOI: 10.1155/2008/243791] [Citation(s) in RCA: 29] [Impact Index Per Article: 2.2] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/02/2007] [Accepted: 07/02/2007] [Indexed: 01/10/2023] Open
Abstract
Peroxisome proliferator-activated receptor gamma (PPARG) regulates cellular functions such as adipogenesis and immune cell activation. However, new information has indicated additional roles of PPARG directing the cyclic changes that occur within ovarian tissue of female mammals, including those that facilitate the release of oocytes each estrous cycle. In addition to ovarian PPARG expression and function, many PPARG actions within adipocytes and macrophages have additional direct and indirect implications for ovarian function and female fertility. This encompasses the regulation of lipid uptake and transport, insulin sensitivity, glucose metabolism, and the regulation of inflammatory mediator synthesis and release. This review discusses the developing links between PPARG activity and female reproductive function, and highlights several mechanisms that may facilitate such a relationship.
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Katsiki N, Mikhailidis DP, Gotzamani-Psarrakou A, Yovos JG, Karamitsos D. Effect of various treatments on leptin, adiponectin, ghrelin and neuropeptide Y in patients with type 2 diabetes mellitus. Expert Opin Ther Targets 2011; 15:401-20. [DOI: 10.1517/14728222.2011.553609] [Citation(s) in RCA: 36] [Impact Index Per Article: 2.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/10/2023]
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Musholt PB, Schöndorf T, Pfützner A, Hohberg C, Kleine I, Fuchs W, Hehenwarter S, Dikta G, Kerschgens B, Forst T. Combined pioglitazone and metformin treatment maintains the beneficial effect of short-term insulin infusion in patients with type 2 diabetes: results from a pilot study. J Diabetes Sci Technol 2009; 3:1442-50. [PMID: 20144400 PMCID: PMC2787046 DOI: 10.1177/193229680900300626] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Indexed: 11/16/2022]
Abstract
BACKGROUND The aim of our study was to examine the efficacy of short-term intravenous insulin intervention followed by oral pioglitazone/metformin therapy to prevent patients from continuous insulin application. METHODS This prospective, open-label, 4-month pilot study comprised of 14 diabetes patients (5 female, 9 male; age 60 +/- 2 years; body mass index 29 +/- 3.2 kg/m(2); hemoglobin A1c [HbA1c] 7.6 +/- 1.1%) with (1) insufficient glycemic control under a dose of metformin >or=1700 mg/day and/or metformin plus additional oral antidiabetes drugs (OADs) and (2) appropriate residual beta-cell function. Initially, an inpatient 34 h continuous intravenous insulin infusion was performed, and metformin was given (2x 850 mg/day). Insulin was stopped, and pioglitazone 30 mg/day was added at the second inpatient day. Patients were followed for four months. Efficacy parameters [change of HbA1c, fasting blood glucose [FBG], intact proinsulin, adiponectin, and high-sensitivity C-reactive protein (hsCRP)] were assessed after initial normalization of blood glucose values by intravenous insulin and at the study end point. RESULTS During the acute insulin intervention, FBG levels were stabilized in all study subjects. In the following OAD treatment period, five patients showed an improvement of HbA1c > 0.5% [35.7%; seven patients remained stable (50.0%), two patients were nonresponders (14.3%)]. Fasting glucose values dropped after insulin infusion (-17.7%; p < .001). This effect was maintained during the consecutive OAD treatment period (glucose +0.3%, not significant (NS); HbA1c -6.0%; p < .05). The initial decrease in fasting intact proinsulin levels was also maintained during the study (end value -41%, p < .05). Improvements in hsCRP values (postinsulin value, -15%, NS; end value -37%; p < .05) and adiponectin values (postinsulin value +15%, NS; end value +128%; p < .001) were demonstrated at end point only after continued glitazone intake. CONCLUSIONS Our pilot study demonstrated that a beneficial effect of a short-term intravenous insulin application on glycemic control was effectively maintained by pioglitazone/metformin treatment for at least 4 months. In addition, the oral therapy significantly improved cardiovascular risk parameters.
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Affiliation(s)
- Petra B. Musholt
- Institute for Clinical Research and Development, Mainz, Germany
- Gutenberg University Mainz, Endocrine Surgery, Mainz, Germany
| | - Thomas Schöndorf
- Institute for Clinical Research and Development, Mainz, Germany
- University of Cologne Medical Center, Cologne, Germany
- University of Applied Sciences, Applied Natural Sciences, Rheinbach, Germany
| | - Andreas Pfützner
- Institute for Clinical Research and Development, Mainz, Germany
- University of Applied Sciences, Biosciences, Bingen, Germany
| | - Cloth Hohberg
- Institute for Clinical Research and Development, Mainz, Germany
| | | | | | | | - Gerhard Dikta
- University of Applied Sciences, Technomathematics, Aachen, Germany
| | | | - Thomas Forst
- Institute for Clinical Research and Development, Mainz, Germany
- Gutenberg University Mainz, Endocrinology and Metabolic Diseases, Mainz, Germany
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Chu Y, Cui Q, Feng G, Song Z, Jiang X. The expression of resistin in adipose tissues of patients with polycystic ovary syndrome and insulin resistance. ACTA ACUST UNITED AC 2009; 29:642-5. [PMID: 19821101 DOI: 10.1007/s11596-009-0521-6] [Citation(s) in RCA: 8] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/24/2009] [Indexed: 12/15/2022]
Abstract
The relationship between the expression of resistin in polycystic ovary syndrome (PCOS) and insulin resistance was investigated. The plasma resistin concentrations in 35 patients with PCOS and 40 controls were measured by ELISA. Luteinizing hormone (LH), follicle-stimulating hormone (FSH), and fasting insulin (FIN) were tested by radioimmunoassay. Insulin resistance index (HOMA-IR) was calculated. Fasting plasma glucose (FPG) was determined by oxidase test. Western blot and reverse transcriptase PCR (RT-PCR) methods were used to detect the expression of resistin in adipose tissues. The levels of plasma resistin, LH, LH/FSH and FIN and HOMA-IR in patients with PCOS were significantly higher than those in control group (all P<0.05). Plasma resistin was correlated positively with FPG, FIN, HOMA-IR, LH and LH/FSH (r=0.56, 0.60, 0.65, 0.48, and 0.42 respectively). Resistin protein and mRNA expression levels in patients with PCOS were significantly higher than those in normal tissues (all P<0.01). It was concluded that resistin might be involved in the pathogenesis of insulin resistance of PCOS.
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Affiliation(s)
- Yongli Chu
- Department of Obstetrics and Gynecology, Yantai Yuhuangding Hospital, Yantai, 264000, China.
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12
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Sharma AK, Srinivasan BP. Triple verses glimepiride plus metformin therapy on cardiovascular risk biomarkers and diabetic cardiomyopathy in insulin resistance type 2 diabetes mellitus rats. Eur J Pharm Sci 2009; 38:433-44. [PMID: 19765654 DOI: 10.1016/j.ejps.2009.09.004] [Citation(s) in RCA: 46] [Impact Index Per Article: 3.1] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/18/2009] [Revised: 08/23/2009] [Accepted: 09/06/2009] [Indexed: 12/17/2022]
Abstract
IRtype2DM patients are often treated with a combination of antidiabetic agents. Drugs with different complementary mechanisms of action frequently used in daily clinical practice but glycemic control with monotherapeutic attempts fail in the long run. To date, biomarkers for cardiovascular risk and insulin sensitivity with combination of triple oral hypoglycemic therapies are not fully revelled in view of additional cardiovascular risk reduction. In the present study, IRtype2DM induced by administering streptozotocin (90 mg/kg, i.p.) in neonatal rat model. IRtype2DM rats were selected by determining FPI [>60 pmol/l]; HOMA-IR & Hyperinsulinemic euglycemic clamp technique at 6 weeks and then treated for 8 weeks with (i) Metformin (120 mg/kg, o.d.)+Glimepiride (1mg/kg, o.d.), (ii) Metformin (265 mg/kg, o.d.)+Rosiglitazone (1mg/kg, o.d.)+Glimepiride (0.7 mg/kg, o.d.). At the end cardiovascular risk parameters evaluated by ELISA kits and insulin sensitivity were determined by HOMA-IR. In conclusion, triple oral hypoglycemic therapy improves glycemic control, insulin sensitivity, retards diabetic cardiomyopathy and does not increased body weight; decrease more detrimental inflammatory markers, increase interleukin-10 and adiponectin in neonatal streptozotocin-induced IRtype2DM Wistar Albino Rats. Triple therapy showed a synergistic effect and was promising in insulin resistance, better in additional cardiovascular risk reduction and those nonresponders to metformin add on glimepiride therapy.
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Affiliation(s)
- Ashish Kumar Sharma
- Department of Pharmacology, Suresh Gyan Vihar University, Mahal, Jagatpura, Jaipur, Rajasthan, Pincode 302025, India.
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Patients with nonalcoholic fatty liver disease display increased serum resistin levels and decreased adiponectin levels. Eur J Gastroenterol Hepatol 2009; 21:662-6. [PMID: 19282764 DOI: 10.1097/meg.0b013e328317f4b5] [Citation(s) in RCA: 27] [Impact Index Per Article: 1.8] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Indexed: 12/24/2022]
Abstract
AIM Resistin and adiponectin are recently discovered protein hormones, which are produced and secreted by adipocytes. Nonalcoholic fatty liver disease (NAFLD) is a metabolic syndrome, which is associated with obesity. The aim of this study was to evaluate the changes of serum adiponectin and resistin in patients with NAFLD and to determine the relationship between serum adipokine levels and clinicopathologic parameters of NAFLD. METHODS Forty-three patients with NAFLD and 43 controls were enrolled in this pair-matched study. Body weight, height, body mass index, abdominal wall fat thickness, waist circumference, hip circumference, and the percentage of body fat were measured. Additionally, serum lipid, glucose, alanine aminotransferase, aspartate aminotransferase, adiponectin, and resistin were determined in all individuals. Serum adiponectin and resistin levels were determined using ELISA kits. RESULTS Serum adiponectin levels were significantly lower in patients with NAFLD compared to the control group (control: 2.01+/-1.10 mg/l vs. NAFLD: 1.38+/-0.65 mg/l, P<0.01). Serum resistin levels were significantly elevated in patients with NAFLD compared to the control group (control: 4.70+/-3.30 ng/ml vs. NAFLD: 9.20+/-7.20 ng/ml, P<0.05). Serum adiponectin concentration was negatively correlated with the waist circumference (rho=-0.425), body mass index (rho=-0.329), percentage of body fat (rho=-0.256), abdominal wall fat thickness (rho=-0.226), and fasting blood glucose concentration (rho=-0.242), but was positively correlated with HDL (rho=0.226). Serum resistin concentration was positively correlated with waist circumference (rho=0.237). No correlation was found between resistin levels and blood pressure, fasting blood glucose concentration, triglyceride, total cholesterol, and HDL. CONCLUSION NAFLD patients had lower adiponectin levels and higher resistin levels. A positive correlation was found between resistin and waist circumference, whereas a negative correlation was found between adiponectin and waist circumference, body mass index, percentage of body fat, abdominal wall fat thickness, and fasting blood glucose concentration. These data suggested that hypoadiponectinemia and hyperresistinemia might be involved in the development of NAFLD.
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Knockdown of Pdcd4 results in induction of proprotein convertase 1/3 and potent secretion of chromogranin A and secretogranin II in a neuroendocrine cell line. Biol Cell 2008; 100:703-15. [PMID: 18549351 DOI: 10.1042/bc20080052] [Citation(s) in RCA: 22] [Impact Index Per Article: 1.4] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/17/2022]
Abstract
BACKGROUND INFORMATION Pdcd4 (programmed cell death 4) is up-regulated during apoptosis and seems to play an important role as a tumour suppressor. To gain further insights into its biological functions, we suppressed Pdcd4 expression in the neuroendocrine cell line Bon-1 via siRNA (small interfering RNA) technology. RESULTS Using this cell line, we found that suppression of Pdcd4 resulted in an increased release of CgA (chromogranin A) and Sg II (secretogranin II), and was accompanied by an up-regulation of intracellular PC1 (proprotein convertase 1/3). The enhanced secretion of CgA and Sg II seemed to be mediated by an activation of protein kinase Akt via PI3K (phosphoinositide 3-kinase). In accordance with this, inhibition of PI3K activity and, thereby, reduced phosphorylation of Akt was shown to enhance Pdcd4 expression. Neither the PKC (protein kinase C) signal transduction cascade nor the MAPK (mitogen-activated protein kinase) pathway seemed to play a role in the regulation of CgA and Sg II secretion by Pdcd4. CONCLUSIONS CgA is considered to be a marker for neuroendocrine tumours, and up-regulation of PC1 has been reported in various types of cancers. The repression of PC1 by Pdcd4 may represent a novel mechanism for the function of Pdcd4 as a tumour suppressor. Our results are of particular interest, as we observed that pioglitazone, an oral medication used in the treatment of Type 2 diabetes, decreased Pdcd4 levels, activated Akt, increased CgA and Sg II secretion and augmented PC1 protein in Bon-1 cells. Enhanced PC1 levels, leading to improved processing of proinsulin and proglucagon, may contribute to the benefits of pioglitazone therapy. The in vivo relevance of our findings was highlighted by data indicating elevated CgA amounts in the sera of patients treated with pioglitazone. This is the first study connecting Pdcd4 levels, secretion behaviour of neuroendocrine cells and regulation of PI3K activity.
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Ohman MK, Shen Y, Obimba CI, Wright AP, Warnock M, Lawrence DA, Eitzman DT. Visceral adipose tissue inflammation accelerates atherosclerosis in apolipoprotein E-deficient mice. Circulation 2008; 117:798-805. [PMID: 18212290 DOI: 10.1161/circulationaha.107.717595] [Citation(s) in RCA: 106] [Impact Index Per Article: 6.6] [Reference Citation Analysis] [Abstract] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Indexed: 01/19/2023]
Abstract
BACKGROUND Fat inflammation may play an important role in comorbidities associated with obesity such as atherosclerosis. METHODS AND RESULTS To first establish feasibility of fat transplantation, epididymal fat pads were harvested from wild-type C57BL/6J mice and transplanted into leptin-deficient (Lep(ob/ob)) mice. Fat transplantation produced physiological leptin levels and prevented obesity and infertility in Lep(ob/ob) mice. However, the transplanted fat depots were associated with chronically increased macrophage infiltration with characteristics identical to those observed in fat harvested from obese animals. The inflammation in transplanted adipose depots was regulated by the same factors that have been implicated in endogenous fat inflammation such as monocyte chemoattractant protein-1. To determine whether this inflamed adipose depot could affect vascular disease in mice, epididymal fat depots were transplanted into atherosclerosis-prone apolipoprotein E-deficient ApoE(-/-) mice. Plasma from ApoE(-/-) mice receiving fat transplants contained increased leptin, resistin, and monocyte chemoattractant protein-1 compared with plasma from sham-operated ApoE(-/-) mice. Furthermore, mice transplanted with visceral fat developed significantly more atherosclerosis compared with sham-operated animals, whereas transplants with subcutaneous fat did not affect atherosclerosis despite a similar degree of fat inflammation. Treatment of transplanted ApoE(-/-) mice with pioglitazone decreased macrophage content of the transplanted visceral fat pad and reduced plasma monocyte chemoattractant protein-1. Importantly, pioglitazone also reduced atherosclerosis triggered by inflammatory visceral fat but had no protective effect on atherosclerosis in the absence of the visceral fat transplantation. CONCLUSIONS Our results indicate that visceral adipose-related inflammation accelerates atherosclerosis in mice. Drugs such as thiazolidinediones might be a useful strategy to specifically attenuate the vascular disease induced by visceral inflammatory fat.
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Affiliation(s)
- Miina K Ohman
- University of Michigan, Department of Internal Medicine, Division of Cardiology, Ann Arbor 48109-0644, USA
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Abstract
In the last few years, there has been increasing focus on the impact of interventions on cardiovascular outcomes in patients with type 2 diabetes. Insulin resistance and hyperglycaemia often co-exist with a cluster of risk factors for coronary artery disease, but the underlying mechanisms leading to the development of such vascular complications are complex. The over-production of free radicals in patients suffering from diabetes results in a state of oxidative stress, which leads to endothelial dysfunction and a greater risk of atherosclerosis. Moreover, inflammatory factors which play a critical role in atherothrombosis and plaque rupture are often found to be at elevated levels in this patient population. Thiazolidinediones (TZDs) are now routinely used to manage glucose levels, and have been suggested to influence other cardiovascular risk factors and therefore the pathways leading to macrovascular events. Consequently, recent studies have investigated the anti-inflammatory and anti-atherogenic properties of TZDs. The data available up to the present time, in the context of the emerging cardiovascular outcome profiles of rosiglitazone and pioglitazone, will be discussed here.
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Affiliation(s)
- Antonio Ceriello
- Warwick Medical School, Clinical Sciences Research Institute, University Hospital, Coventry, Warwickshire, UK.
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Sourij H, Wascher TC. Pioglitazone in the management of Type 2 diabetes and beyond. ACTA ACUST UNITED AC 2007. [DOI: 10.2217/14750708.4.5.517] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
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Bibliography. Current world literature. Diabetes and the endocrine pancreas II. Curr Opin Endocrinol Diabetes Obes 2007; 14:329-57. [PMID: 17940461 DOI: 10.1097/med.0b013e3282c3a898] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [MESH Headings] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Indexed: 11/25/2022]
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Bibliography. Current world literature. Diabetes and the endocrine pancreas. Curr Opin Endocrinol Diabetes Obes 2007; 14:170-96. [PMID: 17940437 DOI: 10.1097/med.0b013e3280d5f7e9] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [MESH Headings] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Indexed: 11/26/2022]
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20
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Bibliography. Current world literature. Growth and development. Curr Opin Endocrinol Diabetes Obes 2007; 14:74-89. [PMID: 17940424 DOI: 10.1097/med.0b013e32802e6d87] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [MESH Headings] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Indexed: 11/27/2022]
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