Document Type : Original Article (s)
Authors
1
MSc Student, Student Research Committee, Department of Physiology, School of Medicine, Isfahan University of Medical Sciences, Isfahan, Iran.
2
Associate Professor, Department of Physiology, School of Medicine, Isfahan University of Medical Sciences, Isfahan, Iran.
3
Assistant Professor, Department of Anatomy, School of Medicine, Isfahan University of Medical Sciences, Isfahan, Iran.
4
Department of Physiology, School of Medicine, Isfahan University of Medical Sciences, Isfahan, Iran.
Abstract
Background: Peroxisome proliferator–activated receptors (PPARs) are ligand-activated transcription factors of nuclear receptor superfamily, consisting of three subtypes: PPARα, γ, β/δ. Clinical evidence suggests that PPARs may be involved in regulating angiogenesis. In this study, we examined the hypothesis that whether activation of PPARγ by Rosiglitazone, a PPARγ agonist, can alter coronary angiogenesis in diabetic and control rats.Methods: Twenty four male rats were randomly divided into four groups as follows: group 1: control rats received vehicle; group 2: control rats received Rosiglitazone (8mg/kg/day) by gavage every day; group 3: diabetic rats received vehicle; group 4: diabetic rats received Rosiglitazone (8mg/kg/day) by gavage everyday. All rats were sacrified after 21 days and their hearts muscles were harvested for immonohistochemistry.Finding: The mean capillary density in control rats was higher than diabetic rats (P = 0.08). Rosiglitazone treatment could not change capillary density of the heart in diabetic rats (121.71 ± 13.32 versus 136.62 ± 7.02/mm2) and nondiabetic rats (153.78 ± 11.08 versus 135.96 ± 4.3/mm2).Conclusion: Our findings demonstrate that diabetes is associated with reduced capillary density in the heart and PPARγ activation by Rosiglitazone could not alter angiogenesis in diabetic and non-diabetic rats.
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