Mitochondrial cyclophilin D ablation is associated with the activation of Akt/p70S6K pathway in the mouse kidney

Sci Rep. 2017 Sep 5;7(1):10540. doi: 10.1038/s41598-017-10076-9.

Abstract

The mitochondrial matrix protein cyclophilin D (CypD) is an essential component of the mitochondrial permeability transition pore (MPTP). Here we characterized the effects of CypD ablation on bioenergetics in the kidney. CypD loss triggers a metabolic shift in Ppif-/- male and female mouse kidneys towards glycolysis and Krebs cycle activity. The shift is accompanied by increased glucose consumption and a transcriptional upregulation of effectors of glucose metabolism in the kidney. These included activation of Akt, AMPK (only in males) and p70S6K kinases. Gender specific differences between the Ppif-/- male and female mouse kidneys were observed including activation of pro-surviving ERK1/2 kinase and inhibited expression of pro-apoptotic and pro-fibrotic JNK and TGFβ1 proteins in Ppif-/- females. They also showed the highest expression of phosphorylated-ERK1/2 and Akt S473 proteins of all four investigated animal groups. Furthermore, Ppif-/- females showed higher lactate concentrations and ATP/ADP-ratios in the kidney than males. These metabolic and transcriptional modifications could provide an additional level of protection to Ppif-/- females. In summary, loss of mitochondrial CypD results in a shift in bioenergetics and in activation of glucose-metabolism regulating Akt/AMPK/p70S6 kinase pathways that is expected to affect the capability of Ppif-/- mice kidneys to react to stimuli and injury.

MeSH terms

  • AMP-Activated Protein Kinase Kinases
  • Animals
  • Cyclophilins / genetics
  • Cyclophilins / metabolism*
  • Energy Metabolism
  • Female
  • Glucose / metabolism
  • Kidney / metabolism*
  • Male
  • Mice
  • Mitochondria / metabolism*
  • Mitogen-Activated Protein Kinase 1 / metabolism
  • Mitogen-Activated Protein Kinase 3 / metabolism
  • Peptidyl-Prolyl Isomerase F
  • Protein Kinases / metabolism
  • Proto-Oncogene Proteins c-akt / metabolism*
  • Ribosomal Protein S6 Kinases, 70-kDa / metabolism*
  • Signal Transduction*

Substances

  • Peptidyl-Prolyl Isomerase F
  • PPIF protein, mouse
  • Protein Kinases
  • Proto-Oncogene Proteins c-akt
  • Ribosomal Protein S6 Kinases, 70-kDa
  • Mitogen-Activated Protein Kinase 1
  • Mitogen-Activated Protein Kinase 3
  • AMP-Activated Protein Kinase Kinases
  • Cyclophilins
  • Glucose