Mitigation of Radiation-induced Cardiotoxicity by Subcutaneous "Protective Wounding"

Area of Science:

• Cardiovascular Research
• Radiation Oncology
• Hematology

Background:

• Cardiovascular (CV) complications are significant risks for radiotherapy patients and survivors of radiological/nuclear (RAD/NUC) incidents following total-body irradiation (TBI).
• Current treatments lack effective strategies to mitigate early and late cardiac damage from irradiation, despite the availability of mitigators for acute radiation syndrome.
• There is a critical need for novel approaches to prevent or reduce radiation-induced cardiotoxicity.

Purpose of the Study:

• To investigate the efficacy of a non-pharmacological intervention, 'protective wounding' (subcutaneous incision), in mitigating cardiac dysfunction after TBI.
• To assess the impact of protective wounding on cardiac pumping capacity in mice subjected to irradiation.
• To establish protective wounding as a model for studying mechanisms of radiation-induced cardiotoxicity and developing pharmacological mitigators.

Main Methods:

• Mice were subjected to single-dose or fractionated total-body irradiation (TBI).
• A small subcutaneous incision was administered post-irradiation as the 'protective wounding' intervention.
• Cardiac function, specifically left ventricular developed pressure (LVDP), was assessed using the Langendorff technique 30 days post-TBI.

Main Results:

• Protective wounding significantly preserved cardiac function 30 days after TBI.
• Mice receiving a subcutaneous cut after 6.5 Gy TBI exhibited a 22.5% greater LVDP compared to sham-cut controls.
• The findings suggest that protective wounding mitigates radiation-induced cardiac damage.

Conclusions:

• Subcutaneous wounding post-TBI is an effective non-pharmacological strategy for preserving cardiac function.
• Protective wounding shows potential as a novel therapeutic approach to reduce cardiotoxicity in radiotherapy and RAD/NUC incident scenarios.
• This method provides a valuable model for future research into the mechanisms underlying radiation-induced cardiac injury and the development of pharmacological mitigators.