Abstract
Stress caused by cardioplegic ischemic arrest was shown to alter the expression levels of heat shock proteins (Hsp), but little is known about their effects, particularly on pediatric hearts. This study aimed to investigate whether myocardial cellular stress and apoptotic response changes due to different cardioplegia (CP) solutions during cardiopulmonary bypass (CPB) in infants and to determine their influence on surgical/clinical outcomes. Therefore, twenty-seven infants for surgical closure of ventricular septal defect were randomly assigned to a CP solution: normothermic blood (BCP), delNido (dNCP), and Custodiol (CCP). Hsp levels and apoptosis were determined by immunoblotting in cardiac tissue from the right atrium before and after CP, and their correlations with cardiac parameters were evaluated. No significant change was observed in Hsp27 levels. Hsp60, Hsp70, and Hsp90 levels decreased significantly in the BCP-group but increased markedly in the CCP-group. Decreased Hsp60 and increased Hsp70 expression were detected in dNCP-group. Importantly, apoptosis was not observed in dNCP- and CCP-groups, whereas marked increases in cleaved caspase-3 and -8 were determined after BCP. Serum cardiac troponin-I (cTn-I), myocardial injury marker, was markedly lower in the BCP- and dNCP-groups than CCP. Additionally, Hsp60, Hsp70, and Hsp90 levels were positively correlated with aortic cross-clamp time, total perfusion time, and cTn-I release. Our findings show that dNCP provides the most effective myocardial preservation in pediatric open-heart surgery and indicate that an increase in Hsp70 expression may be associated with a cardioprotective effect, while an increase in Hsp60 and Hsp90 levels may be an indicator of myocardial damage during CPB.
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Data Availability
Data available on request from the authors.
Abbreviations
- ACCT:
-
Aortic cross-clamp time
- BCP:
-
Blood cardioplegia
- CCP:
-
Custodiol cardioplegia
- CHD:
-
Congenital heart disease
- CP:
-
Cardioplegia
- CPB:
-
Cardiopulmonary bypass
- cTn-I:
-
Cardiac troponin-I
- dNCP:
-
DelNido cardioplegia
- Hsp:
-
Heat shock protein
- I/R:
-
Ischemia/reperfusion
- ICU:
-
Intensive care unit
- IS:
-
Inotropic score
- TPT:
-
Total perfusion time
- VIS:
-
Vasoactive-inotropic score
- VSD:
-
Ventricular septal defect
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EY-T, EÖ-U, and HC conceived the project. EY-T, BZT-R, and AAY collected and assembled the clinical data. AŞ and EÖ-U collected and assembled the molecular data. AŞ and ÖFŞ analyzed the data. EY-T, AŞ, and EÖ-U interpreted the data and wrote the manuscript. All authors read and approved the manuscript.
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The study was approved by the ethics committee of Kartal Koşuyolu High Specialization Training and Research Hospital, Istanbul, Turkey (decision no: 2017/5/31, 19th June 2017).
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Yayla-Tunçer, E., Şengelen, A., Tan-Recep, B.Z. et al. Acute Changes in Myocardial Expression of Heat Shock Proteins and Apoptotic Response Following Blood, delNido, or Custodiol Cardioplegia in Infants Undergoing Open-Heart Surgery. Pediatr Cardiol 43, 567–579 (2022). https://doi.org/10.1007/s00246-021-02759-y
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DOI: https://doi.org/10.1007/s00246-021-02759-y