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Activation and modulation of cardiac poly-adenosine diphosphate ribose polymerase activity in a rat model of brain
John G Brain1, Anthony J Rostron, John H Dark
1Applied Immunobiology and Transplantation Research Group, Institute of Cellular Medicine, The Medical School, University of Newcastle, Newcastle upon Tyne NE2 4HH, United Kingdom. j.g.brain@ncl.ac.uk
Abstract:
DNA damage during transplantation can activate poly-adenosine diphosphate ribose polymerase (PARP) resulting in the generation of polymers of adenosine diphosphate-ribose (PAR). Excessive linkage of PAR to nuclear proteins can induce cell death, thereby limiting the function of transplanted organs. This study uses a rat model of brain death to determine the profile of PARP activation and whether mechanisms that lead to cell death can be ameliorated by appropriate donor resuscitation. The expression of PAR-linked nuclear proteins within cardiac myocytes was greatly increased after the induction of donor brain death. Importantly, infusion of noradrenaline or vasopressin to normalize the chronic hypotension produced by brain death reduced the expression of PAR to a level below baseline. These data suggest that chronic hypotension after donor brain death has the potential to limit cardiac function through the activation of PARP; however, this early cause of graft damage can be mitigated by appropriate donor resuscitation.
Insights
Brain death causes DNA damage, activating poly-adenosine diphosphate ribose polymerase (PARP). Donor resuscitation with noradrenaline or vasopressin reduced PARP activation, mitigating cardiac cell death and improving transplant outcomes.
Area of Science:
- Transplantation immunology
- Cellular signaling pathways
- Organ preservation
Background:
- DNA damage during organ transplantation can activate poly-adenosine diphosphate ribose polymerase (PARP).
- Excessive PARylation of nuclear proteins by PARP can lead to cell death, impairing transplanted organ function.
- Brain death in donors is a significant factor affecting graft quality and post-transplant outcomes.
Purpose of the Study:
- To investigate PARP activation profiles in a rat brain death model.
- To determine if donor resuscitation strategies can ameliorate PARP-induced cell death mechanisms.
- To assess the impact of chronic hypotension on PARP activation and cardiac function in potential transplant donors.
Main Methods:
- Utilized a rat model of induced brain death.
- Quantified the expression of PAR-linked nuclear proteins in cardiac myocytes.
- Administered noradrenaline or vasopressin to normalize blood pressure in hypotensive donors.
Main Results:
- Brain death induction significantly increased PAR-linked protein expression in cardiac myocytes.
- Donor resuscitation with noradrenaline or vasopressin markedly reduced PAR expression, even below baseline levels.
- These findings indicate a direct link between hypotension post-brain death and PARP activation.
Conclusions:
- Chronic hypotension following donor brain death activates PARP, potentially limiting cardiac allograft function.
- Early intervention through appropriate donor resuscitation can mitigate this PARP-mediated graft damage.
- Optimizing donor management strategies is crucial for improving transplant success rates.
