title: Establishment of Early Endpoints in Mouse Total-Body Irradiation Model.
abstract: Acute radiation sickness (ARS) following exposure to ionizing irradiation is characterized by radiation-induced multiorgan dysfunction/failure that refers to progressive dysfunction of two or more organ systems, the etiological agent being radiation damage to cells and tissues over time. Radiation sensitivity data on humans and animals has made it possible to describe the signs associated with ARS. A mouse model of total-body irradiation (TBI) has previously been developed that represents the likely scenario of exposure in the human population. Herein, we present the Mouse Intervention Scoring System (MISS) developed at the Veterinary Sciences Department (VSD) of the Armed Forces Radiobiology Research Institute (AFRRI) to identify moribund mice and decrease the numbers of mice found dead, which is therefore a more humane refinement to death as the endpoint. Survival rates were compared to changes in body weights and temperatures in the mouse (CD2F1 male) TBI model (6-14 Gy, 60Co γ-rays at 0.6 Gy min-1), which informed improvements to the Scoring System. Individual tracking of animals via implanted microchips allowed for assessment of criteria based on individuals rather than by group averages. From a total of 132 mice (92 irradiated), 51 mice were euthanized versus only four mice that were found dead (7% of non-survivors). In this case, all four mice were found dead after overnight periods between observations. Weight loss alone was indicative of imminent succumbing to radiation injury, however mice did not always become moribund within 24 hours while having weight loss >30%. Only one survivor had a weight loss of greater than 30%. Temperature significantly dropped only 2-4 days before death/euthanasia in 10 and 14 Gy animals. The score system demonstrates a significant refinement as compared to using subjective assessment of morbidity or death as the endpoint for these survival studies.
authors: Veterinary Science Department, Armed Forces Radiobiology Research Institute (AFRRI) Uniformed Services University (USU), Bethesda, Maryland, United States of America.
authors: Amory
authors: http://orcid.org/0000-0002-3747-4715
authors: A
authors: Koch
authors: Veterinary Science Department, Armed Forces Radiobiology Research Institute (AFRRI) Uniformed Services University (USU), Bethesda, Maryland, United States of America.|The Henry M. Jackson Foundation, Bethesda, Maryland, United States of America.
authors: Jatinder
authors: J
authors: Gulani
authors: Scientific Research Department, Armed Forces Radiobiology Research Institute (AFRRI), Uniformed Services University (USU), Bethesda, Maryland, United States of America.
authors: Gregory
authors: G
authors: King
authors: The Henry M. Jackson Foundation, Bethesda, Maryland, United States of America.|Scientific Research Department, Armed Forces Radiobiology Research Institute (AFRRI), Uniformed Services University (USU), Bethesda, Maryland, United States of America.
authors: Kevin
authors: K
authors: Hieber
authors: Veterinary Science Department, Armed Forces Radiobiology Research Institute (AFRRI) Uniformed Services University (USU), Bethesda, Maryland, United States of America.
authors: Mark
authors: M
authors: Chappell
authors: Scientific Research Department, Armed Forces Radiobiology Research Institute (AFRRI), Uniformed Services University (USU), Bethesda, Maryland, United States of America.
authors: Natalia
authors: N
authors: Ossetrova
mesh_terms: D054508:Acute Radiation Syndrome / Q000473:pathology / Q000503:physiopathology; D000818:Animals; D004307:Dose-Response Relationship, Radiation; D005720:Gamma Rays / Q000009:adverse effects*; D008297:Male; D051379:Mice; D011833:Radiation Injuries, Experimental / Q000473:pathology / Q000503:physiopathology; D014916:Whole-Body Irradiation