Gene therapy for myocardial protection - Transfection of donor hearts withheat shock protein 70 gene protects cardiac function against ischemia-reperfusion injury
J. Jayakumar et al., Gene therapy for myocardial protection - Transfection of donor hearts withheat shock protein 70 gene protects cardiac function against ischemia-reperfusion injury, CIRCULATION, 102(19), 2000, pp. 302-306
Citations number
25
Categorie Soggetti
Cardiovascular & Respiratory Systems","Cardiovascular & Hematology Research
Background-Heat shock protein 70 (HSP70) gene transfection has been shown t
o enhance myocardial tolerance after normothermic ischemia-reperfusion. We
investigated the effect of HSP70 gene transfection on mechanical and endoth
elial function in a protocol mimicking clinical heart preservation.
Methods and Results-Rat hearts were infused ex vivo with Hemagglutinating V
irus of Japan-liposome complex containing HSP70 gene (HSP, n=8) or no gene
(CON, n=8), and heterotopically transplanted into recipient rats. Four days
after surgery, transfected hearts were perfused on a Langendorff apparatus
for 45 minutes, arrested with St Thomas' No, 1 cardioplegia for 4 hours at
4 degreesC, and reperfused for 1 hour. Mechanical and endothelial function
was studied before and after ischemia. Creatine kinase was measured in rep
erfusion effluent. Hearts underwent Western blotting and immunohistochemist
ry to confirm HSP70 overexpression. Postischemic recovery of mechanical fun
ction (% preischemic+/-SEM) was greater in HSP versus CON: Left ventricular
developed pressure recovery was 76.7+/-3.9% versus 60.5+/-3.1% (P<0.05); d
P/dtmax recovery was 79.4+/-4.9% versus 56.2+/-3.2% (P<0.05); dP/dtmin reco
very was 74.8+/-4.6% versus 57.3+/-3.6% (P<0.05), Creatine kinase release w
as attenuated in HSP versus CON: 0.22+/-0.02 versus 0.32+/-0.04 IU/min/g we
t wt. (P<0.05). Recovery of coronary flow was greater in HSP versus CON: 76
.5+/-3.8% versus 59.2+/-3.2% (P<0.05). Recovery of coronary response to 5-h
ydroxytryptamine (5x10(-5) mol/L) was 55.6+/-4.7% versus 23.9+/-3.2% (P<0.0
5); recovery of coronary response to glyceryltrinitrate (15 mg/L) was not d
ifferent between HSP and CON: 87.4+/-6.9% versus 84.3+/-5.8% (NS).
Conclusions-In a clinically relevant donor heart preservation protocol, HSP
70 gene transfection protects both mechanical and endothelial function.