Abstract
Purpose
Vascular endothelium plays a central role in the pathogenesis of acute and chronic radiation injuries, yet the mechanisms which promote sustained endothelial dysfunction and contribute to late responding organ failure are unclear. We employed 2nd window (> 1100 nm emission) Near-Infrared (NIR) imaging using indocyanine green (ICG) to track and define the role of the notch ligand Delta-like ligand 4 (Dll4) in mediating vascular injury in two late-responding radiosensitive organs: the lung and kidney.
Procedures
Consomic strains of female Salt Sensitive or SS (Dll4-high) and SS with 3rd chromosome inherited from Brown Norway, SS.BN3 (Dll4-low) rats at ages 11–12 weeks were used to demonstrate the impact of reduced Dll4 expression on long-term vascular integrity, renal function, and survival following high-dose 13 Gy partial body irradiation at 42- and 90 days post-radiation. 2nd window dynamic NIR fluorescence imaging with ICG was analyzed with physiology-based pharmacokinetic modeling and confirmed with assays of endothelial Dll4 expression to assess the role of endogenous Dll4 expression on radiation injury protection.
Results
We show that SS.BN3 (Dll4-low) rats are relatively protected from vascular permeability disruption compared to the SS (Dll4-high) strain. We further demonstrated that SS.BN3 (Dll4-low) rats have reduced radiation induced loss of CD31+ vascular endothelial cells, and increased Dll4 vascular expression is correlated with vascular dysfunction.
Conclusions
Together, these data suggest Dll4 plays a key role in pathogenesis of radiation-induced vascular injury to the lung and kidney.
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Data Availability
This study employed the established consomic rat models SS and SS.BN3. The publicly accessible and NIH supported Rat Genome Database (rgd.mcw.edu) catalogs and has tools to explore the genotype and phenotype information for the SS (Dll4-high) and SS.BN3 (Dll4-low) strains under strain records RRID: RGD_61499 and RRID: RGD_1358154, respectively. The PBPK analysis codes are available by request from the corresponding author.
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Funding
This work was supported by funding from NIH/NIAID U01AI133594 (PI H. Himburg), U01AI138331 (PI M. Medhora), NIH/NCI 2R01CA193343 (PI A. Joshi), MCW Department of Radiation Oncology, and the MCW Cancer Center.
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Kondelaji, M.H.R., Sharma, G.P., Jagtap, J. et al. 2nd Window NIR Imaging of Radiation Injury Mitigation Provided by Reduced Notch-Dll4 Expression on Vasculature. Mol Imaging Biol 26, 124–137 (2024). https://doi.org/10.1007/s11307-023-01840-7
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DOI: https://doi.org/10.1007/s11307-023-01840-7