Deficiency in apoptosis-inducing factor recapitulates chronic kidney disease via aberrant mitochondrial homeostasis

Melinda T. Coughlan, Gavin C Higgins, Tuong Vi B Nguyen, Sally A. Penfold, Vicki Thallas-Bonke, Sih Min Tan, Georg Ramm, Nicole J. Van Bergen, Darren C. Henstridge, Karly C. Sourris, Brooke E. Harcourt, Ian A. Trounce, Portia M Robb, Adrienne Laskowski, Sean L McGee, Amanda J. Genders, Ken Walder, Brian G. Drew, Paul Gregorevic, Hongwei QianMerlin C. Thomas, George Jerums, Richard J MacIsaac, Alison Skene, David A. Power, Elif I. Ekinci, Xiaonan W. Wijeyeratne, Linda A. Gallo, Michal Herman-Edelstein, Michael T. Ryan, Mark E. Cooper, David R. Thorburn, Josephine M. Forbes

    Research output: Contribution to journalArticle

    Abstract

    Apoptosis-inducing factor (AIF) is a mitochondrial flavoprotein with dual roles in redox signaling and programmed cell death. Deficiency in AIF is known to result in defective oxidative phosphorylation (OXPHOS), via loss of complex I activity and assembly in other tissues. Because the kidney relies on OXPHOS for metabolic homeostasis, we hypothesized that a decrease in AIF would result in chronic kidney disease (CKD). Here, we report that partial knockdown of Aif in mice recapitulates many features of CKD, in association with a compensatory increase in the mitochondrial ATP pool via a shift toward mitochondrial fusion, excess mitochondrial reactive oxygen species production, and Nox4 upregulation. However, despite a 50% lower AIF protein content in the kidney cortex, there was no loss of complex I activity or assembly. When diabetes was superimposed onto Aif knockdown, there were extensive changes in mitochondrial function and networking, which augmented the renal lesion. Studies in patients with diabetic nephropathy showed a decrease in AIF within the renal tubular compartment and lower AIFM1 renal cortical gene expression, which correlated with declining glomerular filtration rate. Lentiviral overexpression of Aif1m rescued glucose-induced disruption of mitochondrial respiration in human primary proximal tubule cells. These studies demonstrate that AIF deficiency is a risk factor for the development of diabetic kidney disease.

    Original languageEnglish
    Pages (from-to)1085-1098
    Number of pages14
    JournalDiabetes
    Volume65
    Issue number4
    DOIs
    Publication statusPublished - Apr 2016

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