Abstract:
:Physical activity decreases risk for diabetes and cardiovascular disease morbidity and mortality; however, the specific impact of exercise on the diabetic vasculature is unexamined. We hypothesized that an acute, moderate exercise intervention in diabetic and hypertensive rats would induce mitochondrial biogenesis and mitochondrial antioxidant defence to improve vascular resilience. SHHF/Mcc-fa(cp) lean (hypertensive) and obese (hypertensive, insulin resistant), as well as Sprague Dawley (SD) control rats were run on a treadmill for 8 days. In aortic lysates from SD rats, we observed a significant increase in subunit proteins from oxidative phosphorylation (OxPhos) complexes I-III, with no changes in the lean or obese SHHF rats. Exercise also increased the expression of mitochondrial antioxidant defence uncoupling protein 3 (UCP3) (p < 0.05) in SHHF lean rats, whereas no changes were observed in the SD or SHHF obese rats with exercise. We evaluated upstream signalling pathways for mitochondrial biogenesis, and only peroxisome proliferators-activated receptor gamma coactivator 1α (PGC-1α) significantly decreased in SHHF lean rats (p < 0.05) with exercise. In these experiments, we demonstrate absent mitochondrial induction with exercise exposure in models of chronic vascular disease. These findings suggest that chronic vascular stress results in decreased sensitivity of vasculature to the adaptive mitochondrial responses normally induced by exercise.
journal_name
Diab Vasc Dis Resjournal_title
Diabetes & vascular disease researchauthors
Knaub LA,McCune S,Chicco AJ,Miller M,Moore RL,Birdsey N,Lloyd MI,Villarreal J,Keller AC,Watson PA,Reusch JEdoi
10.1177/1479164112459664subject
Has Abstractpub_date
2013-05-01 00:00:00pages
222-38issue
3eissn
1479-1641issn
1752-8984pii
1479164112459664journal_volume
10pub_type
杂志文章abstract:OBJECTIVE:The aim of this study was to determine whether high fitness attenuates the defects in left ventricular (LV) structure, function and triglyceride (TG) content in patients with type 2 diabetes mellitus (T2DM). MATERIALS AND METHODS:Patients (n = 74) with T2DM and ≥1 additional cardiac risk factor were recruite...
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pub_type: 杂志文章
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pub_type: 杂志文章,随机对照试验
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