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Hypergravity upregulates renal inducible nitric oxide synthase expression and nitric oxide production.

 Gun Yoon  ;  Choong Sik Oh  ;  Hyun-Soo Kim 
 ONCOTARGET , Vol.7(21) : 30147-30154, 2016 
Journal Title
Issue Date
Animals ; Gene Expression Regulation, Enzymologic ; Hypergravity* ; Hypoxia-Inducible Factor 1, alpha Subunit/metabolism ; Immunohistochemistry ; Kidney/enzymology* ; Kidney/metabolism ; Mice, Inbred ICR ; Nitric Oxide/biosynthesis* ; Nitric Oxide Synthase Type II/genetics ; Nitric Oxide Synthase Type II/metabolism* ; Reverse Transcriptase Polymerase Chain Reaction ; Time Factors ; Up-Regulation*
Pathology Section ; hypergravity ; inducible nitric oxide synthase ; kidney ; nitric oxide
Exposure to hypergravity severely decreases renal blood flow, potentially causing renal dysfunction. Nitric oxide (NO), which is endogenously synthesized by inducible NO synthase (iNOS), plays an important role in the regulation of renal function. The purpose of this study was to examine the effect of hypergravity exposure on the production of NO in kidneys. To determine whether hypergravity induces renal hypoxia and alters renal iNOS expression and NO production, mice were exposed to short-term hypergravity at +3Gz for 1 h. The time course of iNOS mRNA expression, hypoxia-inducible factor (HIF)-1α expression, and NO production was examined. Renal HIF-1α levels were significantly elevated immediately after centrifugation, and this increase was sustained for 3 h post-exposure. iNOS mRNA levels were also significantly increased immediately after exposure and were maintained during the reoxygenation period. Immunohistochemical staining for iNOS revealed that the cortical tubular epithelium exhibited moderate to strong cytoplasmic iNOS immunoreactivity immediately after hypergravity exposure and during the reoxygenation period. The time course of NO production was similar to that of iNOS expression. Our results suggest that both hypoxia and reoxygenation might be involved in the upregulation of HIF-1α in the kidneys of mice exposed to hypergravity. Significant increases in renocortical iNOS expression immediately after centrifugation and during the reoxygenation period suggest that iNOS expression induced by hypergravity exposure might play a protective role against hypoxia/reoxygenation injury in the renal cortex. Further investigations are necessary to clarify the role of iNOS and NO in kidneys exposed to hypergravity.
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1. College of Medicine (의과대학) > Dept. of Pathology (병리학교실) > 1. Journal Papers
Yonsei Authors
Kim, Hyun-Soo(김현수)
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