Format

Send to

Choose Destination
Pathol Res Pract. 2016 Apr;212(4):325-34. doi: 10.1016/j.prp.2016.02.005. Epub 2016 Feb 6.

Swimming training attenuates the morphological reorganization of the myocardium and local inflammation in the left ventricle of growing rats with untreated experimental diabetes.

Author information

1
Department of General Biology, Federal University of Viçosa, Viçosa, MG, Brazil; Department of Basic Sciences, Federal University of Jequitinhonha and Mucuri Valleys, Diamantina, MG, Brazil. Electronic address: edsondasilvaatm@hotmail.com.
2
Department of Physical Education, Federal University of Viçosa, Viçosa, MG, Brazil.
3
Department of General Biology, Federal University of Viçosa, Viçosa, MG, Brazil.
4
Department of Physical Education, Federal University of Viçosa, Viçosa, MG, Brazil; Department of Physical Education, Federal University of Jequitinhonha and Mucuri Valleys, Diamantina, MG, Brazil.
5
Department of Medicine and Nursing, Federal University of Viçosa, Viçosa, MG, Brazil.
6
Department of General Biology, Federal University of Viçosa, Viçosa, MG, Brazil; Faculty of Medicine, Federal University of Jequitinhonha and Mucuri Valleys, Diamantina, MG, Brazil.
7
Department of General Biology, Federal University of Viçosa, Viçosa, MG, Brazil; Biomedical Sciences Institute, Federal University of Alfenas, MG, Brazil.

Abstract

Diabetic cardiomyopathy is associated with cardiac remodeling, myocardial dysfunction, low-grade inflammation, and reduced cardiac adiponectin in patients with type 1 diabetes mellitus (T1DM). Alternatively, physical exercise is an important strategy for the management of diabetes. This study aimed to investigate the influence of low-intensity swimming training in cardiac cytokines, structural remodeling, and cardiomyocyte contractile dysfunction in growing rats with untreated experimental DM. Thirty-day-old male Wistar rats were divided into four groups (n=14, per group): sedentary control (SC), exercised control (EC), sedentary diabetic (SD), and exercised diabetic (ED). Diabetes was induced by streptozotocin (60 mg kg(-1), i.p.). Animals from exercised groups swam (5 days/week, 90 min/day, loading up to 5% body weight around the animal's chest) for 8 weeks. The left ventricle (LV) was removed for molecular, morphological, and cardiomyocyte mechanical analysis. Diabetic animals presented cardiac remodeling with myocardial histoarchitectural disorganization, fibrosis, and necrosis. The capillary density was lower in diabetic animals. LV cardiomyocytes from diabetic animals exhibited more prolonged time to the peak of contraction and time to half relaxation than those from control animals. The cardiac levels of interleukin 10, nitric oxide, and total and high molecular weight (HMW) adiponectin were significantly decreased in diabetic animals. Exercise training reduced the level of TNF-α, increased capillary density, and attenuated the histopathological parameters assessed in diabetic rats. In conclusion, the cardiac structural remodeling coexists with reduced levels of total and HMW adiponectin, inflammation, and cardiomyocyte contractility dysfunction in experimental DM. More important, low-intensity swimming training attenuates part of these pathological changes, indicating the beneficial role for exercise in untreated T1DM.

KEYWORDS:

Adiponectin; Cardiomyocyte; Diabetes mellitus; Exercise; Inflammation; Ventricular remodeling

PMID:
26896925
DOI:
10.1016/j.prp.2016.02.005
[Indexed for MEDLINE]

Supplemental Content

Full text links

Icon for Elsevier Science
Loading ...
Support Center