Peroxisomal L-bifunctional Protein Deficiency Causes Male-specific Kidney Hypertrophy and Proximal Tubular Injury in Mice

Pablo Ranea-Robles, Kensey Portman, Aaron Bender, Kyung Lee, John Cijiang He, David J. Mulholland, Carmen Argmann, Sander M. Houten

Research output: Contribution to journalArticlepeer-review

10 Scopus citations

Abstract

Background Proximal tubular (PT) cells are enriched in mitochondria and peroxisomes. Whereas mitochondrial fatty acid oxidation (FAO) plays an important role in kidney function by supporting the high-energy requirements of PT cells, the role of peroxisomal metabolism remains largely unknown. L-bifunctional protein (EHHADH) catalyzes the second and third step of peroxisomal FAO. Methods We studied kidneys of WT and Ehhadh KO mice on a C57BL/6N background using histology, immunohistochemistry, immunofluorescence, immunoblot, RNA-sequencing, and metabolomics. To assess the role of androgens in the kidney phenotype of Ehhadh KO mice, mice underwent orchiectomy. Results We observed male-specific kidney hypertrophy and glomerular filtration rate reduction in adult Ehhadh KO mice. Transcriptome analysis unveiled a gene expression signature similar to PT injury in AKI mouse models. This was further illustrated by the presence of kidney injury molecule-1 (KIM-1), SOX-9, and Ki67-positive cells in the PT of male Ehhadh KO kidneys. Male Ehhadh KO kidneys had metabolite changes consistent with peroxisomal dysfunction and an elevation in glycosphingolipid levels. Orchiectomy of Ehhadh KO mice decreased the number of KIM-1-positive cells to WT levels. We revealed a pronounced sexual dimorphism in the expression of peroxisomal FAO proteins in mouse kidney, underlining a role of androgens in the kidney phenotype of Ehhadh KO mice. Conclusions Our data highlight the importance of EHHADH and peroxisomal metabolism in male kidney physiology, and reveal peroxisomal FAO as a sexual dimorphic metabolic pathway in mouse kidneys.

Original languageEnglish
Pages (from-to)1441-1454
Number of pages14
JournalKidney360
Volume2
Issue number9
DOIs
StatePublished - 1 Sep 2021

Keywords

  • androgens
  • basic science
  • chronic kidney disease
  • hypertrophy
  • kidney
  • mice
  • multifunctional protein 1
  • peroxisomal bifunctional protein
  • peroxisomes
  • proximal tubule
  • sex differences

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