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• W4387472321 abstract "Abstract Small intestinal epithelial vacuolation induced by a heteroaryldihydropyrimidine compound (HAP‐1) was observed in rats but not in dogs at termination in screening toxicity studies, despite the plasma exposure being higher in dogs. To understand the species differences, investigational studies with multiple time points following single dose (SD) and 7‐day repeated dose (RD) were conducted in both species at doses resulting in comparable plasma exposures. In rats, epithelial vacuolation in the duodenum and jejunum were observed at all time points. In dogs, transient vacuolation was noted at 8 h post‐SD (SD_8h) and 4 h post‐RD (RD_4 h), but not at termination (RD_24 h). Special stains demonstrated lipid accumulation within enterocytes in both species and intracytoplasmic inclusion bodies in rats. Transmission electron microscopy identified these inclusion bodies as endoplasmic reticulum (ER) membranous structures. Transcriptomic analysis on jejunal mucosa at SD_8 h and RD_24 h revealed perturbations of lipid metabolism‐related genes at SD_8 h in both species, but not at RD_24 h in dogs. ER stress‐related gene changes at both time points were observed in rats only. Despite comparable HAP‐1 plasma exposures, the duodenum and jejunum tissue concentrations of HAP‐1 and acyl glucuronide metabolite were >5‐ and >30‐fold higher in rats than in dogs, respectively. In vitro, similar cytotoxicity was observed in rat and dog duodenal organoids treated with HAP‐1. In conclusion, HAP‐1‐induced intestinal epithelial vacuolation was related to lipid metabolism dysregulation in both species and ER‐related injuries in rats only. The species differences were likely related to the difference in intestinal exposure to HAP‐1 and its reactive metabolite." @default.
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• W4387472321 date "2023-10-09" @default.
• W4387472321 modified "2023-10-12" @default.
• W4387472321 title "Species differences in small intestinal exposure‐related epithelial vacuolation in rats and dogs treated with a heteroaryldihydropyrimidine molecule" @default.
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• W4387472321 doi "https://doi.org/10.1002/jat.4550" @default.
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