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Thiazolidinediones Upregulate Fatty Acid Uptake and Oxidation in Adipose Tissue of Diabetic Patients Guenther Boden,1,2 Carol Homko,2 Maria Mozzoli,1,2 Louise C

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Thiazolidinediones Upregulate Fatty Acid Uptake and Oxidation in Adipose Tissue of Diabetic Patients Guenther Boden,1,2 Carol Homko,2 Maria Mozzoli,1,2 Louise C Thiazolidinediones Upregulate Fatty Acid Uptake and Oxidation in Adipose Tissue of Diabetic Patients Guenther Boden,1,2 Carol Homko,2 Maria Mozzoli,1,2 Louise C. Showe,3 Calen Nichols,3 and Peter Cheung1,2 Thiazolidinediones (TZDs) are a new class of insulin- TZDs produce insulin sensitization, which takes place sensitizing drugs. To explore how and in which tissues primarily in skeletal muscle (6). Lowering plasma free they improve insulin action, we obtained fat and muscle fatty acid (FFA) levels improves insulin sensitivity (7). The biopsies from eight patients with type 2 diabetes before well-established TZD lowering of plasma FFAs has there- -fore been widely considered to be a major factor respon (5 ؍ and 2 months after treatment with rosiglitazone (n ,TZD treatment was associated sible for their insulin sensitizing effect (8–12). It is .(3 ؍ or troglitazone (n with a coordinated upregulation in the expression of however, not clear how TZDs lower FFA levels. Since they genes and synthesis of proteins involved in fatty acid ␤ seem to have little or no effect on basal rates of lipolysis uptake, binding, -oxidation and electron transport, (11,13,14), the decrease in plasma FFA levels is probably and oxidative phosphorylation in subcutaneous fat but not in skeletal muscle. These changes were accompa- due to an increase in FFA clearance (oxidation and/or nied by a 13% increase in total body fat oxidation, a 20% esterification). Supporting this notion, we have recently decrease in plasma free fatty acid levels, and a 46% found that TZD-induced lowering of plasma FFAs was increase in insulin-stimulated glucose uptake. We con- associated with an increase in total body fatty acid oxida- clude that TZDs induced a coordinated stimulation of tion (FOX) (14). This study, however, provided no infor- fatty acid uptake, oxidation, and oxidative phosphory- mation as to the location (fat, muscle, or both) or the lation in fat of diabetic patients and thus may have mechanism by which TZDs stimulated FOX. To further corrected, at least partially, a recently recognized explore these issues, we have now investigated the effects defect in patients with type 2 diabetes consisting of of TZD treatment on the expression of genes related to reduced expression of genes related to oxidative fatty acid uptake and oxidation in subcutaneous fat and in metabolism and mitochondrial function. Diabetes 54: 880–885, 2005 skeletal muscle of patients with type 2 diabetes. RESEARCH DESIGN AND METHODS We studied eight patients with type 2 diabetes (Table 1). Two were treated hiazolidinediones (TZDs), a new class of insulin- with sulfonylureas, two with sulfonylureas and metformin, two received sensitizing drugs, are strong peroxisome prolif- sulfonylureas, metformin, and NPH insulin (10–25 units at bedtime), and two erator–activated receptor ␥ (PPAR␥) agonists received insulin twice daily. These medications were withheld at least 72 h (1). As their binding affinity to PPAR␥ correlates before hospital admission but were otherwise continued throughout the T studies. Informed written consent was obtained from all subjects after well with their insulin sensitizing activity, it is generally explanation of the nature, purpose, and potential risks of the studies. The accepted that TZDs exert their insulin sensitizing action study protocol was approved by the institutional review board of Temple through PPAR␥ (2,3). However, exactly how and where University Hospital. TZDs increase insulin sensitivity remains incompletely All patients were admitted to the general clinical research center at Temple ϳ understood. PPAR␥ is expressed at highest concentrations University Hospital the night before the study. At 8:00 A.M. on the day of the study, a fat and muscle biopsy was obtained from the subcutaneous fat of the in adipose tissue and at much lower concentrations in liver upper thigh and the lateral vastus muscle, respectively, and rates of fat and muscle (4,5), suggesting that the primary action of oxidation (FOX) were determined by indirect calorimetry. After that, the TZDs is on adipose tissue. This raises the question of how patients were started on TZDs. After 2 months on TZD therapy, they were readmitted for another fat and muscle biopsy and FOX measurement. The initial three patients received troglitazone (600 mg/day) and the other five From the 1Division of Endocrinology, Diabetes, and Metabolism, Temple patients received rosiglitazone (8 mg/day). The change was necessary because University School of Medicine, Philadelphia, Pennsylvania; the 2General troglitazone was withdrawn from the U.S. market after the study had begun. Clinical Research Center, Temple University School of Medicine, Philadelphia, Fat and muscle biopsies. Under local anesthesia (1% lidocaine in a field Pennsylvania; and the 3Wistar Institute, Philadelphia, Pennsylvania. block pattern), an incision (ϳ1 inch) was made through the skin at the lateral Address correspondence and reprint requests to Guenther Boden, MD, aspect of the upper thigh (ϳ15 cm above the patella) and ϳ200 mg of Temple University Hospital, 3401 N. Broad St., Philadelphia, PA 19140. E-mail: subcutaneous adipose tissue was mobilized and excised. Through the same [email protected]. ϳ Received for publication 14 July 2004 and accepted in revised form incision, biopsies ( 100 mg) were obtained from the lateral aspect of the 9 December 2004. vastus lateralis muscle. The excised fat and muscle samples were dropped Additional information for this article can be found in an online appendix at immediately into isopentane, kept at its freezing point (Ϫ160°C) by liquid http://diabetes.diabetesjournals.org. nitrogen, and stored at Ϫ80°C until used for RNA extraction. ACADM, acyl-CoA dehydrogenase; FFA, free fatty acid; FOX, fatty acid Array hybridization. The cDNA filter arrays were prepared by the Wistar oxidation; HCS, cytochrome C; PPAR␥, peroxisome proliferator–activated Institute Genomics facility (available at www.wistar.upenn.edu/genomics and ␥ receptor ; TZD, thiazolidinedione. ref. 16). A 7.5 ϫ 11.5–cm nylon filter (HA-04) carrying a total of 9,600 probes © 2005 by the American Diabetes Association. was used. Sequence-verified clones were purchased from Research Genetics The costs of publication of this article were defrayed in part by the payment of page charges. This article must therefore be hereby marked “advertisement” in accordance (Huntsville, AL). Total RNA was isolated from the aqueous phase by isopro- with 18 U.S.C. Section 1734 solely to indicate this fact. panol precipitation after homogenization in phenol-guanidine thiocyanate 880 DIABETES, VOL. 54, MARCH 2005 G. BODEN AND ASSOCIATES TABLE 1 Soluble proteins, 35 ␮g per lane, were resolved in 8–16% SDS-PAGE and Characteristics of study subjects transferred to nitrocellulose membranes. CD-36 immunoblots were probed for 1 h with a monoclonal anti-CD36 antibody at 1:1,000 (Santa Cruz, Santa Cruz, Pre-TZD Post-TZD CA). Cytochrome C was detected with a monoclonal mouse anti-pigeon cyto- chrome C antibody (diluted 1:1,000; Imgenex, San Diego, CA). ␤-Actin was de- Sex (M/F) 5/3 5/3 tected with a monoclonal mouse anti-human ␤-actin antibody (diluted 1:4,000; Age (years) 53 Ϯ 3—Santa Cruz). A horseradish peroxidase conjugate goat anti-mouse IgM anti- Weight (kg) 95.2 Ϯ 6.2 95.5 Ϯ 6.4 body (A-8786m; Sigma, St. Louis, MO) was applied for1hat1:5,000. Immu- Body fat (kg) 35.9 Ϯ 3.7 34.0 Ϯ 4.0 noreactivity was detected by chemiluminescence. Acyl-CoA dehydrogenase BMI (kg/m2) 32.7 Ϯ 1.7 33.0 Ϯ 1.8 (ACADM) immunoblots were probed with a rabbit polyclonal anti-ACADM Duration of diabetes (years) 8.4 Ϯ 2.1 — antibody at 1:1,000 (AG Scientific, San Diego, CA) at 4°C overnight. A horse- Ϯ Ϯ radish peroxidase conjugate goat anti-rabbit IgG antibody was applied for 1 h HbA1c (%) 8.8 0.5 8.7 0.9 at 1:200,000. Immunoreactivity was detected by Femto Maximum Sensitivity Substrate and Cl-Xposure film (Pierce). The signal was scanned by Hewlett- (Tri-Reagent Molecular Research Center, Cincinnati, OH). Total RNA samples Packard Scanjet and quantitated by Scion Image (Scion, Frederick, MD). were amplified (aRNA) using a modified T7 protocol for fat (available at Statistical analysis. All data are expressed as means Ϯ SE. Statistical http://cmgm.Stanford.edu/pbrown/protocols) and muscle (MessageAmp; Am- significance was assessed using repeated-measures ANOVA and paired stu- bion, Austin, TX). Each sample (total 32) was hybridized to a single array, as dent’s two-tailed t test when applicable. materials were limited. The average relative error between arrays was Ͻ9% when they were hybridized in triplicate under our standard conditions (data RESULTS not shown). All hybridization steps were carried out in a hybridization oven with constant rotation: prehybridization 1 was in 3 ml of MicroHyb (Research Adipose tissue Genetics) and 1 ␮g/ml of salmon sperm DNA for1hat42°C then removed. A Effect of TZDs on gene expression. TZD treatment of total of 2.5 ml of MicroHyb with 1 ␮g/ml of denatured human Cot-1 DNA and the eight patients with type 2 diabetes (Table 1) was as- 1 ␮g/ml of PolydA (Prehyb2) was added and filters incubated for2hat42°C. The aRNA target was labeled with 33P (30005-000 Ci/mmol; Amersham Phar- sociated with a statistically significant twofold or greater macia Biotech) using reverse transcriptase. The denatured 33P target (0.8 ␮g) increase in the expression (by microarray) of 107 gene was added to Prehyb 2, and filters were incubated at 42°C for 18 h. Filters sequences and a twofold or greater decrease in the expres- were washed two times in 2ϫ SSC/1% SDS, one time in 0.5ϫ SSC/1% SDS, and sion of six gene sequences (online appendix [available at one time in 0.1ϫ SSC/0.5% SDS each for 30Ј at 55°C.
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