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A High-Fat Diet Coordinately Downregulates Genes Required for Mitochondrial Oxidative Phosphorylation in Skeletal Muscle Lauren M

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A High-Fat Diet Coordinately Downregulates Genes Required for Mitochondrial Oxidative Phosphorylation in Skeletal Muscle Lauren M A High-Fat Diet Coordinately Downregulates Genes Required for Mitochondrial Oxidative Phosphorylation in Skeletal Muscle Lauren M. Sparks, Hui Xie, Robert A. Koza, Randall Mynatt, Matthew W. Hulver, George A. Bray, and Steven R. Smith Obesity and type 2 diabetes have been associated with a ray studies have shown that genes involved in oxidative high-fat diet (HFD) and reduced mitochondrial mass phosphorylation (OXPHOS) exhibit reduced expression and function. We hypothesized a HFD may affect expres- levels in the skeletal muscle of type 2 diabetic subjects and sion of genes involved in mitochondrial function and prediabetic subjects. These changes may be mediated by biogenesis. To test this hypothesis, we fed 10 insulin- the peroxisome proliferator–activated receptor ␥ coacti- sensitive males an isoenergetic HFD for 3 days with vator-1 (PGC1) pathway. PGC1␣- and PGC1␤-responsive muscle biopsies before and after intervention. Oligonu- cleotide microarray analysis revealed 297 genes were OXPHOS genes show reduced expression in the muscle of differentially regulated by the HFD (Bonferonni ad- patients with type 2 diabetes (3,4). In addition to the justed P < 0.001). Six genes involved in oxidative cellular energy sensor AMP kinase, the peroxisome prolif- phosphorylation (OXPHOS) decreased. Four were mem- erator–activated receptor cofactors PGC1␣ (5–7) and pos- bers of mitochondrial complex I: NDUFB3, NDUFB5, sibly PGC1␤ (8) activate mitochondrial biogenesis and NDUFS1, and NDUFV1; one was SDHB in complex II and increase OXPHOS gene expression by increasing the tran- a mitochondrial carrier protein SLC25A12. Peroxisome scription, translation, and activation of the transcription proliferator–activated receptor ␥ coactivator-1 (PGC1) -and PGC1␤ mRNA were decreased by ؊20%, P < 0.01, factors necessary for mitochondrial DNA (mtDNA) repli ␣ and ؊25%, P < 0.01, respectively. In a separate exper- cation. Similarly, PGC1␣ increases the transcription of iment, we fed C57Bl/6J mice a HFD for 3 weeks and enzymes necessary for substrate oxidation, electron trans- found that the same OXPHOS and PGC1 mRNAs were port, and ATP synthesis. Morphological and functional downregulated by ϳ90%, cytochrome C and PGC1␣ studies (1,9,10), combined with the recent microarray ϳ protein by 40%. Combined, these results suggest a data, indicate that PGC1 is important in the development mechanism whereby HFD downregulates genes neces- sary for OXPHOS and mitochondrial biogenesis. These of type 2 diabetes. changes mimic those observed in diabetes and insulin Rates of ATP synthesis, measured in situ with magnetic resistance and, if sustained, may result in mitochondrial resonance spectroscopy, are decreased in subjects with a dysfunction in the prediabetic/insulin-resistant state. family history of diabetes before the onset of impaired Diabetes 54:1926–1933, 2005 glucose tolerance (2,10). Based on these results, the prevailing view is that these defects have a genetic origin (2). One common feature of diverse insulin-resistant states is an elevation in nonesterified fatty acids (11). This gave t the molecular and structural level, mitochon- rise to the concept of “lipotoxicity” and “ectopic fat” (12) drial biogenesis and mitochondrial function are and shifted attention toward the adipose tissue and in- altered in diabetes, as well as in insulin-resis- creased free fatty acid concentrations as a potential foun- A tant relatives of type 2 diabetic subjects (1,2). dation for insulin resistance (11). At the ultra-structural level, a reduction in the number, Excess dietary fat has also been implicated in the location, and morphology of mitochondria is strongly development of obesity and diabetes (13). At energy associated with insulin resistance (1). Two recent microar- balance, high-fat diets (HFDs) increase the flux of fatty acids through skeletal muscle for oxidation. The purpose From the Pennington Biomedical Research Center, Baton Rouge, Louisiana of these experiments was to identify the transcriptional Address correspondence and reprint requests to Steven R. Smith, Penning- responses of skeletal muscle to an isoenergetic HFD in ton Biomedical Research Center, 6400 Perkins Road, Baton Rouge, LA 70808. healthy young men using oligonucleotide microarrays. We E-mail: [email protected]. Received for publication 10 December 2004 and accepted in revised form 4 found a HFD downregulated PGC1␣ and PGC1␤ mRNA, as April 2005. well as genes encoding proteins in complexes I, II, III, and Additional information for this article can be found in an online appendix at http://diabetes.diabetesjournals.org. IV of the electron transport chain. These changes were BHAD, ␤-hydroxyacyl-CoA dehydrogenase; HFD, high-fat diet; mtDNA, recapitulated and amplified in a murine model after a mitochondrial DNA; OXPHOS, oxidative phosphorylation; PGC1, peroxisome 3-week HFD, along with decreases in PGC1␣ and cyto- proliferator–activated receptor ␥ coactivator-1. © 2005 by the American Diabetes Association. chrome C protein. These studies implicate increased di- The costs of publication of this article were defrayed in part by the payment of page etary fat in the defects in OXPHOS genes observed in charges. This article must therefore be hereby marked “advertisement” in accordance with 18 U.S.C. Section 1734 solely to indicate this fact. diabetes and the prediabetic/insulin-resistant state. 1926 DIABETES, VOL. 54, JULY 2005 L.M. SPARKS AND ASSOCIATES RESEARCH DESIGN AND METHODS TABLE 1 ADAPT is a short-term intervention study designed to examine inter-individual Characteristics of the study population before the high-fat diet differences in the ability to increase fat oxidation after consuming an Ϯ Ϯ Age (years) 23.0 3.1 isoenergetic HFD (14,15). Ten healthy young men, aged 23.0 3.1 years and Ϯ Ϯ 2 Height (cm) 179.7 6.3 with BMIs of 24.3 3.0 kg/m underwent physical examination, medical Ϯ laboratory tests, and anthropometry. The subjects had high preference for Weight (kg) 78.9 13.2 dietary fat as indicated by food preference questionnaire (114.16 Ϯ 18.14). BMI (kg/m²) 24.3 Ϯ 3.0 ⅐ Ϫ1 ⅐ Ϫ1 Ϯ This measure is highly correlated with self-selected fat intake (16). Partici- VO2max (ml kg min ) 48.8 3.3 pants presented to Pennington inpatient unit on day Ϫ4 and ate a weight- Waist-to-hip ratio (AU) 0.88 Ϯ 0.1 maintaining (35% fat, 16% protein, and 49% carbohydrate) diet prepared by the RQ–metabolic cart (AU) 0.87 Ϯ 0.1 metabolic kitchen. On day Ϫ3, a euglycemic-hyperinsulinemic clamp was Fasting glucose (ml/dl) 78.4 Ϯ 4.7 performed, and this diet was continued on days Ϫ2, Ϫ1, and 1. On day 1, Fasting insulin (␮l/ml) 4.6 Ϯ 1.4 participants ate the same weight-maintaining 35% fat diet, and total daily GDR (mg ⅐ kg FFMϪ1 ⅐ minϪ1) 14.7 Ϯ 4.1 energy expenditure, fat oxidation, protein oxidation, and carbohydrate oxida- Free fatty acids (mmol) 0.4 Ϯ 0.1 tion were measured at energy balance as previously described in a whole- Body fat (%) 16.2 Ϯ 3.2 room calorimeter (17,18). On days 2, 3, and 4 subjects ate a 50% fat, 16% Fat cell size (␮l) 0.93 Ϯ 0.2 protein, 34% carbohydrate diet with an isoenergetic energy clamp procedure. Each meal was served to the subjects and consumed within 20 min. Data are means Ϯ SD. GDR, glucose disposal rate; RQ, respiratory Euglycemic-hyperinsulinemic clamp. Insulin sensitivity was measured only quotient. at baseline (day Ϫ3) by euglycemic-hyperinsulinemic clamp (19) before HFD. After an overnight fast, glucose and insulin (80 mIU/m2 BSA) were adminis- tered. The glucose disposal rate (M value) was adjusted for kilograms of lean differentially expressed genes before versus after the HFD. Differentially body mass. expressed genes were identified based on a Bonferroni adjusted P Ͻ 0.01. Maximal aerobic capacity. Maximal oxygen uptake was determined by a Real-time quantitative RT-PCR for RNA. RNA sample pairs (1 ␮g) were progressive treadmill test to exhaustion (20). The volume of O2 and CO2 was reverse transcribed using iScript cDNA synthesis kit (BioRad, Hercules, CA). measured continuously using a metabolic cart (V-Max29 Series; Sensor- All primers and probes were designed using Primer Express version 2.1 Medics, Yorba Linda, CA). (Applied Biosystems-Roche, Branchburg, NJ). Sequences of primers and Body composition. Body fat mass and lean body mass were measured on a probes are shown in Supplemental Table 1 (online appendix [available at Hologic Dual Energy X-ray Absorptiometer (QDR 4500; Hologic, Waltham, http://diabetes.diabetesjournals.org]). MA). Real-time quantitative RT-PCR reactions (26) were performed as one-step Indirect calorimetry. Respiratory quotient and 24-h energy expenditure reactions in ABI PRISM 7900 (Applied Biosystems) using the following were determined in the whole-room calorimeter before and during 3 days of parameters: one cycle of 48°C for 30 min, then 95°C for 10 min, followed by 40 isocaloric HFD and confirmed an increase in fat oxidation (data not shown). cycles at 95°C for 15 s and 60°C for 1 min. For all assays performed using Energy expenditure was set at 1.4 times the resting metabolic rate measured SYBR Green I (Applied Biosystems-Roche), 18S was the internal control; and by metabolic cart and clamped across the 4-day chamber stay. for all assays performed using Taqman primers and probe, RPLP0, which is Animal study. Male C57BL/6J mice were housed at room temperature with a the human equivalent of the murine 36B4 (27), was the internal control. 12-h-light/12-h-dark cycle for 5 weeks. Six mice consumed control diet ad Cyclophilin B was used for all murine assays. All expression data were libitum (D12450B [Research Diets, New Brunswick, NJ]: 10% of energy from normalized by dividing target gene by internal control. fat, 20% of energy from protein, and 70% of energy from carbohydrate), and Real-time PCR for mtDNA and genomic DNA copy number.
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