title: Insulin-Like Growth Factor-1 (IGF-1) Reduces ischemic changes and increases circulating angiogenic factors in experimentally - induced myocardial infarction in rats.
abstract: BACKGROUND
  Coronary artery disease is a global health concern in the present day with limited therapies. Extensive efforts have been devoted to find molecular therapies to enhance perfusion and function of the ischemic myocardium. Aim of the present study was to look into the effects of insulin like growth factor -1 (IGF-1) on circulating angiogenic factors after myocardial ischemia in rats.
  
  
  METHODS
  Adult male Sprague-Dawley rats were randomly divided into 10-days control, myocardial infarction, IGF-1 alone (2 μg/rat/day) and ISO+IGF-1 groups. Isoproterenol (ISO), a synthetic catecholamine was used to induce myocardial infarction. Serum transforming growth factor-β (TGF-β) and vascular endothelial growth factor (VEGF) levels were checked after 10-days of IGF-1 administration.
  
  
  RESULTS
  There was a significant increase in heart weight after IGF-1 treatment. A significant increase in cardiac enzyme level (CK-MB and LDH) was seen in isoproterenol treated rats when compared to control group. IGF-1treatment induced a significant increase in serum angiogenic factors, IGF-1, VEGF and TGF beta levels. IGF-1 also reduced the ischemic changes in the myocardium when compared to the isoproterenol alone treated group.
  
  
  CONCLUSIONS
  In conclusion, treatment with insulin-like growth factor-1 (IGF-1) in myocardial infarction significantly increased circulating angiogenic growth factors like IGF-1, VEGF and TGF beta thus, protecting against myocardial ischemia.
authors.affiliation: Division of Human Biology, Faculty of Medicine, International Medical University, Kuala Lumpur, 57000, Malaysia.
authors.forename: Mathews
authors.initials: M
authors.lastname: Lisa
authors.affiliation: Division of Human Biology, Faculty of Medicine, International Medical University, Kuala Lumpur, 57000, Malaysia.
authors.forename: Nagaraja
authors.initials: N
authors.lastname: Haleagrahara
authors.affiliation: Division of Pathology, International Medical University, Kuala Lumpur, 57000, Malaysia.
authors.forename: Srikumar
authors.initials: S
authors.lastname: Chakravarthi