The Effect of Catachine Supplementation and Exercise Training on Skeletal Muscle Soleus of Antioxidant Enzymes in Obese Zucker Rat

2003 ◽  
Vol 19 ◽  
pp. 1317-1327
Author(s):  
Yong Deog An
Keyword(s):  
Skeletal Muscle ◽  
Antioxidant Enzymes ◽  
Exercise Training ◽  
Zucker Rat ◽  
Obese Zucker Rat

Reduced triglyceride secretion: a metabolic consequence of chronic exercise.

1978 ◽  
Vol 234 (3) ◽  
pp. E221 ◽  
Author(s):  
C Simonelli ◽  
R P Eaton
Keyword(s):  
Exercise Training ◽  
Genetic Model ◽  
Secretion Rate ◽  
Lipid Lowering ◽  
Zucker Rat ◽  
Chronic Exercise ◽  
Similar Reduction ◽  
Triglyceride Secretion ◽  
Obese Zucker Rat

Chronic exercise training is recognized to reduce plasma lipid levels in man and animals, but the mechanism(s) mediating this phenomenon have not been defined. In the present study, we examined triglyceride (TG) production and disposal in vivo in a genetic model of human type IV hyperlipemia, the obese Zucker rat. Utilizing the normolipemic thin littermate as the control, we investigated endogenous production of TG utilizing the Triton methodology and peripheral disposal of an exogenous lipid emulsion utilizing Intralipid injection. In the sedentary state, the hyperlipemic obese Zucker rat demonstrated a threefold elevation in triglyceride secretion rate relative to the normolipemic thin littermate. After a 3-wk period of exercise training, a reduction of basal plasma TG concentration of 42% was associated with a 51% reduction in TG secretion rate, a change adequate to account for the hypolipemic response. Moreover, chronic exercise training also improved the ability to dispose of an Intralipid load. A similar reduction in TG production with reduced TG removal was observed in the thin normolipemic rats, a result that suggests that the lipid lowering response to exercise training may be predominantly mediated by reduced secretion of TG. The possible relationship between reduced TG secretion and alterations in the bihormonal axis of insulin and glucagon are discussed.

Isomer-specific actions of conjugated linoleic acid on muscle glucose transport in the obese Zucker rat

2003 ◽  
Vol 285 (1) ◽  
pp. E98-E105 ◽  
Author(s):  
Erik J. Henriksen ◽  
Mary K. Teachey ◽  
Zachary C. Taylor ◽  
Stephan Jacob ◽  
Arne Ptock ◽  
...  
Keyword(s):  
Oxidative Stress ◽  
Skeletal Muscle ◽  
Glucose Tolerance ◽  
Glucose Transport ◽  
Zucker Rat ◽  
Transport Activity ◽  
Insulin Resistant ◽  
Obese Zucker Rat ◽  
Cla Isomers ◽  
Muscle Glucose Transport

The fatty acid-conjugated linoleic acid (CLA) enhances glucose tolerance and insulin action on skeletal muscle glucose transport in rodent models of insulin resistance. However, no study has directly compared the metabolic effects of the two primary CLA isomers, cis-9, trans-11-CLA (c9,t11-CLA) and trans-10, cis-12-CLA (t10,c12-CLA). Therefore, we assessed the effects of a 50:50 mixture of these two CLA isomers (M-CLA) and of preparations enriched in either c9,t11-CLA (76% enriched) or t10,c12-CLA (90% enriched) on glucose tolerance and insulin-stimulated glucose transport in skeletal muscle of the insulin-resistant obese Zucker ( fa/ fa) rat. Animals were treated daily by gavage with either vehicle (corn oil), M-CLA, c9,t11-CLA, or t10,c12-CLA (all CLA treatments at 1.5 g total CLA/kg body wt) for 21 consecutive days. During an oral glucose tolerance test, glucose responses were reduced ( P < 0.05) by 10 and 16%, respectively, in the M-CLA and t10,c12-CLA animals, respectively, whereas insulin responses were diminished by 21 and 19% in these same groups. There were no significant alterations in these responses in the c9,t11-CLA group. Insulin-mediated glucose transport activity was enhanced by M-CLA treatment in both type I soleus (32%) and type IIb epitrochlearis (58%) muscles and by 36 and 48%, respectively, with t10,c12-CLA. In the soleus, these increases were associated with decreases in protein carbonyls (index of oxidative stress, r = -0.616, P = 0.0038) and intramuscular triglycerides ( r = -0.631, P = 0.0028). Treatment with c9,t11-CLA was without effect on these variables. These results suggest that the ability of CLA treatment to improve glucose tolerance and insulin-stimulated glucose transport activity in insulin-resistant skeletal muscle of the obese Zucker rat are associated with a reduction in oxidative stress and muscle lipid levels and can be specifically ascribed to the actions of the t10,c12 isomer. In the obese Zucker rat, the c9,t11 isomer of CLA is metabolically neutral.

Skeletal muscle biochemical adaptations to exercise training in miniature swine

1997 ◽  
Vol 82 (6) ◽  
pp. 1862-1868 ◽  
Author(s):  
Richard M. McAllister ◽  
Brian L. Reiter ◽  
John F. Amann ◽  
M. Harold Laughlin
Keyword(s):  
Skeletal Muscle ◽  
Antioxidant Enzymes ◽  
Lactate Dehydrogenase ◽  
Exercise Training ◽  
Endurance Exercise ◽  
Oxidative Capacity ◽  
Treadmill Running ◽  
Miniature Swine ◽  
Endurance Exercise Training ◽  
Hydroxyacyl Coa Dehydrogenase

McAllister, Richard M., Brian L. Reiter, John F. Amann, and M. Harold Laughlin. Skeletal muscle biochemical adaptations to exercise training in miniature swine. J. Appl. Physiol. 82(6): 1862–1868, 1997.—The primary purpose of this study was to test the hypothesis that endurance exercise training induces increased oxidative capacity in porcine skeletal muscle. To test this hypothesis, female miniature swine were either trained by treadmill running 5 days/wk over 16–20 wk (Trn; n = 35) or pen confined (Sed; n = 33). Myocardial hypertrophy, lower heart rates during submaximal stages of a maximal treadmill running test, and increased running time to exhaustion during that test were indicative of training efficacy. A variety of skeletal muscles were sampled and subsequently assayed for the enzymes citrate synthase (CS), 3-hydroxyacyl-CoA dehydrogenase, and lactate dehydrogenase and for antioxidant enzymes. Fiber type composition of a representative muscle was also determined histochemically. The largest increase in CS activity (62%) was found in the gluteus maximus muscle (Sed, 14.7 ± 1.1 μmol ⋅ min−1 ⋅ g−1; Trn, 23.9 ± 1.0; P < 0.0005). Muscles exhibiting increased CS activity, however, were located primarily in the forelimb; ankle and knee extensor and respiratory muscles were unchanged with training. Only two muscles exhibited higher 3-hydroxyacyl-CoA dehydrogenase activity in Trn compared with Sed. Lactate dehydrogenase activity was unchanged with training, as were activities of antioxidant enzymes. Histochemical analysis of the triceps brachii muscle (long head) revealed lower type IIB fiber numbers in Trn (Sed, 42 ± 6%; Trn, 10 ± 4; P < 0.01) and greater type IID/X fiber numbers (Sed, 11 ± 2; Trn, 22 ± 3; P < 0.025). These findings indicate that porcine skeletal muscle adapts to endurance exercise training in a manner similar to muscle of humans and other animal models, with increased oxidative capacity. Specific muscles exhibiting these adaptations, however, differ between the miniature swine and other species.

Mechanism for the increased skeletal muscle protein degradation in the obese zucker rat

1999 ◽  
Vol 10 (4) ◽  
pp. 244-248 ◽  
Author(s):  
Josep M Argilés ◽  
Silvia Busquets ◽  
Belén Alvarez ◽  
Francisco J López-Soriano
Keyword(s):  
Skeletal Muscle ◽  
Protein Degradation ◽  
Muscle Protein ◽  
Zucker Rat ◽  
Skeletal Muscle Protein ◽  
Obese Zucker Rat ◽  
Muscle Protein Degradation

Exercise training reverses downregulation of HSP70 and antioxidant enzymes in porcine skeletal muscle after chronic coronary artery occlusion

2006 ◽  
Vol 291 (6) ◽  
pp. R1756-R1763 ◽  
Author(s):  
John M. Lawler ◽  
Hyo-Bum Kwak ◽  
Wook Song ◽  
Janet L. Parker
Keyword(s):  
Oxidative Stress ◽  
Heart Failure ◽  
Skeletal Muscle ◽  
Antioxidant Enzymes ◽  
Exercise Training ◽  
Stress Proteins ◽  
Coronary Artery Occlusion ◽  
Artery Occlusion ◽  
Sod Activity ◽  
Tnf Α

Oxidative stress is associated with muscle fatigue and weakness in skeletal muscle of ischemic heart disease patients. Recently, it was found that endurance training elevates protective heat shock proteins (HSPs) and antioxidant enzymes in skeletal muscle in healthy subjects and antioxidant enzymes in heart failure patients. However, it is unknown whether coronary ischemia and mild infarct without heart failure contributes to impairment of stress proteins and whether exercise training reverses those effects. We tested the hypothesis that exercise training would reverse alterations in muscle TNF-α, oxidative stress, HSP70, SOD (Mn-SOD, Cu,Zn-SOD), glutathione peroxidase (GPX), and catalase (CAT) due to chronic coronary occlusion of the left circumflex (CCO). Yucatan swine were divided into three groups ( n = 6 each): sedentary with CCO (SCO); 12 wk of treadmill exercise training following CCO (ECO); and sham surgery controls (sham). Forelimb muscle mass-to-body mass ratio decreased by 27% with SCO but recovered with ECO. Exercise training reduced muscle TNF-α and oxidative stress (4-hydroxynonenal adducts) caused by CCO. HSP70 levels decreased with CCO (−45%), but were higher with exercise training (+348%). Mn-SOD activity, Mn-SOD protein expression, and Cu,Zn-SOD activity levels were higher in ECO than SCO by 72, 82, and 112%, respectively. GPX activity was 177% greater in ECO than in SCO. CAT trended higher ( P = 0.059) in ECO compared with SCO. These data indicate that exercise training following onset of coronary artery occlusion results in recovery of critical stress proteins and reduces oxidative stress.

scholarly journals Altered Regulation of Contraction-Induced Akt/mTOR/p70S6k Pathway Signaling in Skeletal Muscle of the Obese Zucker Rat

2009 ◽  
Vol 2009 ◽  
pp. 1-9 ◽  
Author(s):  
Anjaiah Katta ◽  
Sunil Kakarla ◽  
Miaozong Wu ◽  
Satyanarayana Paturi ◽  
Murali K. Gadde ◽  
...  
Keyword(s):  
Skeletal Muscle ◽  
Zucker Rats ◽  
Strongly Correlated ◽  
Zucker Rat ◽  
Muscle Adaptation ◽  
Insulin Resistant ◽  
Obese Zucker Rat ◽  
Regulation Of Contraction ◽  
Muscle Loading ◽  
Ribosomal S6 Kinase

Increased muscle loading results in the phosphorylation of the 70 kDa ribosomal S6 kinase (p70S6k), and this event is strongly correlated with the degree of muscle adaptation following resistance exercise. Whether insulin resistance or the comorbidities associated with this disorder may affect the ability of skeletal muscle to activate p70S6k signaling following an exercise stimulus remains unclear. Here, we compare the contraction-induced activation of p70S6k signaling in the plantaris muscles of lean and insulin resistant obese Zucker rats following a single bout of increased contractile loading. Compared to lean animals, the basal phosphorylation of p70S6k (Thr389;37.2% and Thr421/Ser424;101.4%), Akt (Thr308;25.1%), and mTOR (Ser2448;63.0%) was higher in obese animals. Contraction increased the phosphorylation of p70S6k (Thr389), Akt (Ser473), and mTOR (Ser2448) in both models however the magnitude and kinetics of activation differed between models. These results suggest that contraction-induced activation of p70S6k signaling is altered in the muscle of the insulin resistant obese Zucker rat.

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