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This study examines the role of activated protein C (APC), a known mitigator of radiation-induced early toxicity, in long-term plasma metabolite and lipid panels that may be associated with DEARE in APCHi mice. The APCHi mouse model used in the study was developed in a C57BL\/6N background, expressing the D168F\/N173K mouse analog of the hyper-activatable human D167F\/D172K protein C variant. This modification enables increased circulating APC levels throughout the mouse\u2019s lifetime. Male and female cohorts of C57BL\/6N wild-type and APCHi transgenic mice were exposed to 9.5 Gy \u03b3-rays with their hind legs shielded to allow long-term survival that is necessary to monitor DEARE, and plasma was collected at 6 months for LC-MS-based metabolomics and lipidomics. We observed significant dyslipidemia, indicative of inflammatory phenotype, upon radiation exposure. Additionally, observance of several other metabolic dysregulations was suggestive of gut damage, perturbations in TriCarboxylic Acid (TCA) and urea cycles, and arginine metabolism. We also observed gender- and genotype-modulated metabolic perturbations post radiation exposure. The APCHi mice showed near-normal abundance for several lipids. Moreover, restoration of plasma levels of some metabolites, including amino acids, citric acid, and hypoxanthine, in APCHi mice is indicative of APC-mediated protection from radiation injuries. With the help of these findings, the role of APC in plasma molecular events after acute \u03b3-radiation exposure in a gender-specific manner can be established for the first time.<\/jats:p>","DOI":"10.3390\/metabo14050245","type":"journal-article","created":{"date-parts":[[2024,4,24]],"date-time":"2024-04-24T07:38:51Z","timestamp":1713944331000},"page":"245","update-policy":"https:\/\/doi.org\/10.3390\/mdpi_crossmark_policy","source":"Crossref","is-referenced-by-count":2,"title":["Genetic Upregulation of Activated Protein C Mitigates Delayed Effects of Acute Radiation Exposure in the Mouse Plasma"],"prefix":"10.3390","volume":"14","author":[{"ORCID":"https:\/\/orcid.org\/0000-0002-5095-5687","authenticated-orcid":false,"given":"Shivani","family":"Bansal","sequence":"first","affiliation":[{"name":"Department of Oncology, Lombardi Comprehensive Cancer Center, Georgetown University Medical Center, Washington, DC 20057, 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