Abstract
The Wake Forest nonhuman primate (NHP) Radiation Late Effects Cohort (RLEC) is a unique and irreplaceable population of aging NHP radiation survivors which serves the nation’s need to understand the late effects of radiation exposure. Over the past 16 years, Wake Forest has evaluated > 250 previously irradiated rhesus macaques (Macaca mulatta) that were exposed to single total body irradiation (IR) doses of 1.14–8.5 Gy or to partial body exposures of up to 10 Gy (5% bone marrow sparing) or 10.75 Gy (whole thorax). Though primarily used to examine IR effects on disease-specific processes or to develop radiation countermeasures, this resource provides insights on resilience across physiologic systems and its relationship with biological aging. Exposure to IR has well documented deleterious effects on health, but the late effects of IR are highly variable. Some animals exhibit multimorbidity and accumulated health deficits, whereas others remain relatively resilient years after exposure to total body IR. This provides an opportunity to evaluate biological aging at the nexus of resilient/vulnerable responses to a stressor. Consideration of inter-individual differences in response to this stressor can inform individualized strategies to manage late effects of radiation exposure, and provide insight into mechanisms underlying systemic resilience and aging. The utility of this cohort for age-related research questions was summarized at the 2022 Trans-NIH Geroscience Interest Group’s Workshop on Animal Models for Geroscience. We present a brief review of radiation injury and its relationship to aging and resilience in NHPs with a focus on the RLEC.
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Acknowledgements
We thank the laboratory and veterinary technicians and research assistants who conducted assessments. We also give special thanks to John Olson at WFSM for assistance with the animal cohort, and data retrieval, and members of the Register Laboratory for performing clinical biochemical assays.
Funding
This work was supported by the National Institutes of Health (NIH) program grant to Wake Forest University School of Medicine to support the NIAID-funded Radiation Survivor Cohort, U01 AI150578, (Drs. Cline and Schaaf), and the NIA-supported administrative supplement to evaluate aging outcomes and biological mechanism in this cohort. The authors were also supported by career development grants K01 AG059837 (Dr. Justice), and K01 AG056663 (Dr. Quillen).
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All Radiation Late Effects Cohort experimental animal work is conducted at the Wake Forest University School of Medicine, an AAALAC-accredited institution, with IACUC approval.
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Drs. Cline and Schaaf have funding from Roche Pharmaceutical for work unrelated to this manuscript.
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Schaaf, G.W., Justice, J.N., Quillen, E.E. et al. Resilience, aging, and response to radiation exposure (RARRE) in nonhuman primates: a resource review. GeroScience 45, 3371–3379 (2023). https://doi.org/10.1007/s11357-023-00812-7
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DOI: https://doi.org/10.1007/s11357-023-00812-7