Myoblast-seeded biodegradable scaffolds to prevent post-myocardial infarction evolution toward heart failure

Siepe, Matthias; Giraud, Marie-Noëlle; Pavlovic, Mladen; Receputo, Concetina; Beyersdorf, Friedhelm; Menasché, Philippe; Carrel, Thierry; Tevaearai, Hendrik T (2006). Myoblast-seeded biodegradable scaffolds to prevent post-myocardial infarction evolution toward heart failure. Journal of thoracic and cardiovascular surgery, 132(1), pp. 124-31. St. Louis, Mo.: Mosby 10.1016/j.jtcvs.2006.01.052

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OBJECTIVE(S): Even though the mechanism is not clearly understood, direct intramyocardial cell transplantation has demonstrated potential to treat patients with severe heart failure. We previously reported on the bioengineering of myoblast-based constructs. We investigate here the functional outcome of infarcted hearts treated by implantation of myoblast-seeded scaffolds. METHODS: Adult Lewis rats with echocardiography-confirmed postinfarction reduced ejection fraction (48.3% +/- 1.1%) were randomized to (1) implantation of myoblast-seeded polyurethane patches at the site of infarction (PU-MyoB, n = 11), (2) implantation of nonseeded polyurethane patches (PU, n = 11), (3) sham operation (Sham, n = 12), and (4) direct intramyocardial myoblast injection (MyoB, n = 11). Four weeks later, the functional assessment by echocardiography was repeated, and we additionally performed left ventricular catheterization plus histologic studies. RESULTS: The ejection fraction significantly decreased in the PU (39.1% +/- 2.3%; P = .02) and Sham (39.9% +/- 3.5%; P = .04) groups, whereas it remained stable in the PU-MyoB (48.4% +/- 3.1%) and MyoB (47.9% +/- 3.0%) groups during the observation time. Similarly, left ventricular contractility was significantly higher in groups PU-MyoB (4960 +/- 266 mm Hg/s) and MyoB (4748 +/- 304 mm Hg/s) than in groups PU (3909 +/- 248 mm Hg/s, P = .01) and Sham (4028 +/- 199 mm Hg/s, P = .01). Immunohistology identified a high density of myoblasts within the seeded scaffolds without any migration toward the host cardiac tissue and no evidence of cardiac cell differentiation. CONCLUSIONS: Myoblast-seeded polyurethane scaffolds prevent post-myocardial infarction progression toward heart failure as efficiently as direct intramyocardial injection. The immunohistologic analysis suggests that an indirect mechanism, potentially a paracrine effect, may be assumed.

Item Type:	Journal Article (Original Article)
Division/Institute:	04 Faculty of Medicine > Department of Cardiovascular Disorders (DHGE) > Clinic of Heart Surgery
UniBE Contributor:	Carrel, Thierry, Tevaearai, Hendrik
ISSN:	0022-5223
ISBN:	16798312
Publisher:	Mosby
Language:	English
Submitter:	Factscience Import
Date Deposited:	04 Oct 2013 14:50
Last Modified:	27 Feb 2024 14:30
Publisher DOI:	10.1016/j.jtcvs.2006.01.052
PubMed ID:	16798312
Web of Science ID:	000238522000022
URI:	https://boris.unibe.ch/id/eprint/21001 (FactScience: 4828)