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Chronic atorvastatin and exercise can partially reverse established skeletal muscle microvasculopathy in metabolic syndrome.
Lemaster, Kent A; Frisbee, Stephanie J; Dubois, Luc; Tzemos, Nikolaos; Wu, Fan; Lewis, Matthew T; Wiseman, Robert W; Frisbee, Jefferson C.
Afiliación
  • Lemaster KA; Department of Medical Biophysics, University of Western Ontario , London, Ontario , Canada.
  • Frisbee SJ; Department of Pathology and Laboratory Medicine, University of Western Ontario , London, Ontario , Canada.
  • Dubois L; Division of Vascular Surgery, University of Western Ontario , London, Ontario , Canada.
  • Tzemos N; Division of Cardiology, University of Western Ontario , London, Ontario , Canada.
  • Wu F; DMPK, Nonclinical Development, Celgene Corporation, Summit, New Jersey.
  • Lewis MT; Department of Physiology, Michigan State University , East Lansing, Michigan.
  • Wiseman RW; Department of Physiology, Michigan State University , East Lansing, Michigan.
  • Frisbee JC; Department of Medical Biophysics, University of Western Ontario , London, Ontario , Canada.
Am J Physiol Heart Circ Physiol ; 315(4): H855-H870, 2018 10 01.
Article en En | MEDLINE | ID: mdl-29932769
It has long been known that chronic metabolic disease is associated with a parallel increase in the risk for developing peripheral vascular disease. Although more clinically relevant, our understanding about reversing established vasculopathy is limited compared with our understanding of the mechanisms and development of impaired vascular structure/function under these conditions. Using the 13-wk-old obese Zucker rat (OZR) model of metabolic syndrome, where microvascular dysfunction is sufficiently established to contribute to impaired skeletal muscle function, we imposed a 7-wk intervention of chronic atorvastatin treatment, chronic treadmill exercise, or both. By 20 wk of age, untreated OZRs manifested a diverse vasculopathy that was a central contributor to poor muscle performance, perfusion, and impaired O2 exchange. Atorvastatin or exercise, with the combination being most effective, improved skeletal muscle vascular metabolite profiles (i.e., nitric oxide, PGI2, and thromboxane A2 bioavailability), reactivity, and perfusion distribution at both individual bifurcations and within the entire microvascular network versus responses in untreated OZRs. However, improvements to microvascular structure (i.e., wall mechanics and microvascular density) were less robust. The combination of the above improvements to vascular function with interventions resulted in an improved muscle performance and O2 transport and exchange versus untreated OZRs, especially at moderate metabolic rates (3-Hz twitch contraction). These results suggest that specific interventions can improve specific indexes of function from established vasculopathy, but either this process was incomplete after 7-wk duration or measures of vascular structure are either resistant to reversal or require better-targeted interventions. NEW & NOTEWORTHY We used atorvastatin and/or chronic exercise to reverse established microvasculopathy in skeletal muscle of rats with metabolic syndrome. With established vasculopathy, atorvastatin and exercise had moderate abilities to reverse dysfunction, and the combined application of both was more effective at restoring function. However, increased vascular wall stiffness and reduced microvessel density were more resistant to reversal. Listen to this article's corresponding podcast at https://ajpheart.podbean.com/e/reversal-of-microvascular-dysfunction/ .
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Texto completo: 1 Colección: 01-internacional Base de datos: MEDLINE Asunto principal: Condicionamiento Físico Animal / Enfermedades Vasculares Periféricas / Músculo Esquelético / Inhibidores de Hidroximetilglutaril-CoA Reductasas / Síndrome Metabólico / Esfuerzo Físico / Microvasos / Atorvastatina / Microcirculación Tipo de estudio: Prognostic_studies Límite: Animals Idioma: En Revista: Am J Physiol Heart Circ Physiol Asunto de la revista: CARDIOLOGIA / FISIOLOGIA Año: 2018 Tipo del documento: Article País de afiliación: Canadá Pais de publicación: Estados Unidos

Texto completo: 1 Colección: 01-internacional Base de datos: MEDLINE Asunto principal: Condicionamiento Físico Animal / Enfermedades Vasculares Periféricas / Músculo Esquelético / Inhibidores de Hidroximetilglutaril-CoA Reductasas / Síndrome Metabólico / Esfuerzo Físico / Microvasos / Atorvastatina / Microcirculación Tipo de estudio: Prognostic_studies Límite: Animals Idioma: En Revista: Am J Physiol Heart Circ Physiol Asunto de la revista: CARDIOLOGIA / FISIOLOGIA Año: 2018 Tipo del documento: Article País de afiliación: Canadá Pais de publicación: Estados Unidos