Document Detail

Exogenous insulin-like growth factor II enhances post-infarction regional myocardial function in swine.
MedLine Citation:
PMID:  8682018     Owner:  NLM     Status:  MEDLINE    
OBJECTIVES: Insulin-like growth factor II (IGF-II) promotes cardiac myocyte growth and contractility in vitro. This study was designed to investigate the effect of exogenous IGF-II on regional myocardial function at the area of infarct in the pig. METHODS: Myocardial infarction was induced in 12 female anaesthetized pigs by affigel blue beads, embolizing microvessels of the left anterior descending coronary artery distribution. In the experimental group (n = 6), IGF-II (0.12 in two animals and 0.6 in four) was incorporated into the beads and delivered by them to the infarct area. Myocardial function was followed echocardiographically, and the excised heart was analysed immunohistochemically and histopathologically. RESULTS: Myocardial function in injured zones, inversely related to an echocardiographic segmental wall motion score (mean +/- SEM), was similar between the two groups at baseline, but at 4 weeks post-infarction was significantly (P = 0.008) reduced in the control group (0.58 +/- 0.38 vs 3.42 +/- 0.84), in contrast to nearly baseline values in the experimental group (0.58 +/- 0.33 vs 1.17 +/- 0.42, P = 0.41). Cardiac performance in injured segments was significantly better after myocardial injury in the experimental group (P = 0.04). Tissue samples from both groups (4 weeks post-infarction), stained with haematoxylin and eosin demonstrated peri-infarct myocyte hypertrophy, corresponding to regions selectively stained by an antibody for CD56, which highlights growing cardiac myocytes. By image analysis semi-quantification, staining for CD56 was significantly (P = 0.04) higher in the peri-infarct region of the experimental group, as compared with controls (106.5 +/- 2.8 vs 92 +/- 4.4 gray level units). Microvessels stained for von-Willebrand factor were similar in number in both groups (P = 0.8), as were mesenchymal cells stained for vimentin (P = 0.7). CONCLUSIONS: Exogenous IGF-II, delivered to the infarct area ameliorates regional cardiac function in the pig, perhaps by inducing peri-infarct myocyte growth.
A Battler; D Hasdai; I Goldberg; D Ohad; E Di Segni; A Bor; N Varda-Bloom; Z Vered; R Kornowski; M Lake
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Publication Detail:
Type:  Journal Article; Research Support, Non-U.S. Gov't    
Journal Detail:
Title:  European heart journal     Volume:  16     ISSN:  0195-668X     ISO Abbreviation:  Eur. Heart J.     Publication Date:  1995 Dec 
Date Detail:
Created Date:  1996-08-16     Completed Date:  1996-08-16     Revised Date:  2007-11-15    
Medline Journal Info:
Nlm Unique ID:  8006263     Medline TA:  Eur Heart J     Country:  ENGLAND    
Other Details:
Languages:  eng     Pagination:  1851-9     Citation Subset:  IM    
Neufeld Cardiac Research Institute, Sheba Medical Center, Sackler Faculty of Medicine, Tel Aviv University, Israel.
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MeSH Terms
Echocardiography / drug effects
Hemodynamics / drug effects,  physiology
Insulin-Like Growth Factor II / pharmacology*
Myocardial Contraction / drug effects*,  physiology
Myocardial Infarction / pathology,  physiopathology*,  ultrasonography
Myocardium / pathology
Reg. No./Substance:
67763-97-7/Insulin-Like Growth Factor II

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