TY - JOUR
T1 - Insulin-like growth factor I and II preserve myocardial structure in postinfarct swine
AU - Kotlyar, A. A.
AU - Vered, Z.
AU - Goldberg, I.
AU - Chouraqui, P.
AU - Nas, D.
AU - Fridman, E.
AU - Chen-Levy, Z.
AU - Fytlovich, S.
AU - Sangiorgi, G.
AU - Spagnoli, L. G.
AU - Orlandi, A.
AU - Savion, N.
AU - Eldar, M.
AU - Scheinowitz, M.
PY - 2001
Y1 - 2001
N2 - Background - Insulin-like growth factors (IGF) I and II improve myocardial function after coronary occlusion in different animal models. Objectives - To investigate the mechanism of improved myocardial function after administration of IGF-I or IGF-II in acute myocardial infarction. Methods - Female pigs (mean (SD) weight 25 (5) kg) were subjected to acute myocardial infarction by microembolisation with 75-150 μm affigel blue beads. The beads contained and slowly released 150 μg/pig of IGF-I (n = 6), IGF-II (n = 6), or pig albumin (n = 6). Echocardiography, perfusion imaging, and haemodynamic measurements were performed before infarction and during four weeks after infarction. Regional wall motion of different left ventricular segments was scored semiquantitatively on the basis of a three point scoring system, from normal = 0 to dyskinesia = 3. Serum cardiac troponin I concentration was measured before, immediately after, and three hours after the infarct. Excised hearts were analysed for actin, desmin, blood vessel density, and DNA laddering within the infarct, border, and normal myocardial areas. Results - Myocardial function of the infarct related area improved significantly during the four weeks of follow up in both the IGF groups (p = 0.01). Myocardial perfusion, heart rate, and blood pressure were similar in all the animals during the study. Treated animals had lower serum cardiac troponin I concentration (p = 0.001), more actin in the border area (p = 0.01) and infarct area (p = 0.0001), and reduced DNA laddering in the infarct area compared with the controls (p < 0.05). IGF groups had more blood vessels in the border area (p = 0.04) and the infarct area (p = 0.003). Conclusions - Both types of IGF improved myocardial function and the improvement was associated with preservation of myocardial structure. IGF-I was more effective than IGF-II.
AB - Background - Insulin-like growth factors (IGF) I and II improve myocardial function after coronary occlusion in different animal models. Objectives - To investigate the mechanism of improved myocardial function after administration of IGF-I or IGF-II in acute myocardial infarction. Methods - Female pigs (mean (SD) weight 25 (5) kg) were subjected to acute myocardial infarction by microembolisation with 75-150 μm affigel blue beads. The beads contained and slowly released 150 μg/pig of IGF-I (n = 6), IGF-II (n = 6), or pig albumin (n = 6). Echocardiography, perfusion imaging, and haemodynamic measurements were performed before infarction and during four weeks after infarction. Regional wall motion of different left ventricular segments was scored semiquantitatively on the basis of a three point scoring system, from normal = 0 to dyskinesia = 3. Serum cardiac troponin I concentration was measured before, immediately after, and three hours after the infarct. Excised hearts were analysed for actin, desmin, blood vessel density, and DNA laddering within the infarct, border, and normal myocardial areas. Results - Myocardial function of the infarct related area improved significantly during the four weeks of follow up in both the IGF groups (p = 0.01). Myocardial perfusion, heart rate, and blood pressure were similar in all the animals during the study. Treated animals had lower serum cardiac troponin I concentration (p = 0.001), more actin in the border area (p = 0.01) and infarct area (p = 0.0001), and reduced DNA laddering in the infarct area compared with the controls (p < 0.05). IGF groups had more blood vessels in the border area (p = 0.04) and the infarct area (p = 0.003). Conclusions - Both types of IGF improved myocardial function and the improvement was associated with preservation of myocardial structure. IGF-I was more effective than IGF-II.
KW - Growth factors
KW - Myocardial infarction
KW - Troponin I
KW - Ventricular function
UR - http://www.scopus.com/inward/record.url?scp=0035180101&partnerID=8YFLogxK
U2 - 10.1136/heart.86.6.693
DO - 10.1136/heart.86.6.693
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AN - SCOPUS:0035180101
SN - 1355-6037
VL - 86
SP - 693
EP - 700
JO - Heart
JF - Heart
IS - 6
ER -