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Juvenile OLFM4-null mice are protected from sepsis.

Am J Physiol Renal Physiol. 2020 Mar 01;318(3):F809-F816. doi:10.1152/ajprenal.00443.2019. Epub 2020 Feb 18
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摘要


Pediatric sepsis is a leading cause of morbidity and mortality in children. One of the most common and devastating morbidities is sepsis-related acute kidney injury (AKI). AKI was traditionally thought to be related to low perfusion and acute tubular necrosis. However, little acute tubular necrosis can be found following septic AKI, and little is known about the mechanism of septic AKI. Olfactomedin-4 (OLFM4) is a secreted glycoprotein that marks a subset of neutrophils. Increased expression of OLFM4 in the blood is associated with worse outcomes in sepsis. Here, we investigated a pediatric model of murine sepsis using murine pups to investigate the mechanisms of OLFM4 in sepsis. When sepsis was induced in murine pups, survival was significantly increased in OLFM4-null pups. Immunohistochemistry at 24 h after the induction of sepsis demonstrated increased expression of OLFM4 in the kidney, which was localized to the loop of Henle. Renal cell apoptosis and plasma creatinine were significantly increased in wild-type versus OLFM4-null pups. Finally, bone marrow transplant suggested that increased OLFM4 in the kidney reflects local production rather than filtered from the plasma. These results demonstrate renal expression of OLFM4 for the first time and suggest that a kidney-specific mechanism may contribute to survival differences in OLFM4-null animals.

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