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Transforming growth factor-beta expression is significantly lower in hearts preserved with blood/insulin versus
Filio Billia1, Kevin Carter, Viv Rao
1Faculty of Medicine, University of Toronto, Canada.
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Blood/insulin cardioplegia may reduce cardiac allograft vasculopathy (CAV) progression. This study found crystalloid cardioplegia increased endothelial injury markers, including transforming growth factor-beta (TGF-beta), linked to CAV acceleration.
Area of Science:
- Cardiology
- Transplantation Immunology
- Vascular Biology
Background:
- Cardiac allograft vasculopathy (CAV) is a primary cause of death post-cardiac transplant.
- Endothelial injury is a key factor in CAV development and progression.
Purpose of the Study:
- To investigate the impact of blood/insulin versus crystalloid cardioplegia on endothelial injury markers.
- To determine if cardioplegia type influences the expression of specific inflammatory and adhesion molecules.
Main Methods:
- RNA-blot hybridization was used to quantify gene expression levels.
- Expression of tumor necrosis factor-alpha, TGF-beta, ICAM-1, PECAM-1, endothelin-1, and E-selectin was analyzed.
Main Results:
- Crystalloid cardioplegia showed increased expression of multiple endothelial injury markers compared to normal and blood/insulin cardioplegia.
- Transforming growth factor-beta (TGF-beta) levels were significantly lower with blood/insulin cardioplegia than crystalloid cardioplegia (p < 0.05).
Conclusions:
- Blood/insulin cardioplegia may mitigate endothelial damage by reducing TGF-beta expression.
- Utilizing blood/insulin cardioplegia could potentially attenuate the progression of cardiac allograft vasculopathy.
Abstract:
The major cause of morbidity and mortality after cardiac transplantation is cardiac allograft vasculopathy (CAV). The purpose of this study was to examine the expression of markers of endothelial injury that may be affected by blood/insulin or crystalloid cardioplegia. After RNA-blot hybridization, the level of expression of tumor necrosis factor-alpha, transforming growth factor-beta (TGF-beta), intracellular adhesion molecule-1, platelet-endothelial cell adhesion molecule-1, endothelin-1, and E-selectin was increased in crystalloid cardioplegia as compared with normal and blood/insulin cardioplegia; TGF-beta was expressed at significantly lower levels in blood/insulin vs crystalloid cardioplegia (p < 0.05). Because increased expression of TGF-beta has been correlated with accelerated CAV, the use of blood/insulin cardioplegia may help to decrease the extent of endothelial damage and attenuate the progression of CAV.