Trends in Cell Biology
ReviewThe multifaceted role of kidney tubule mitochondrial dysfunction in kidney disease development
Section snippets
The key contribution of proximal tubule metabolism to kidney disease development
The kidney maintains electrolyte and fluid balance and secretes hormones. More than 800 million people suffer from kidney disease. Kidney dysfunction will cause toxin, fluid, and electrolyte build-up. Without treatment, kidney disease can progress to end-stage kidney failure requiring life-sustaining renal replacement therapy. New drug development for kidney disease is limited by our poor mechanistic understanding of disease pathogenesis. Kidney function genetic studies have highlighted
Energy balance
The primary function of the mitochondria is to generate ATP via a chain of biochemical reactions called the Krebs cycle [7]. Kidney tubules, especially proximal tubules transport kilograms of sodium chloride, other electrolytes, and nutrients daily. Kidney tubule cells preferentially oxidase fatty acids to generate energy (Figure 1). It has been known that kidney tubules can also burn ketones and lactate. While glucose utilization is almost undetectable in proximal renal tubules, it could be
Redox regulation and oxidative stress
Defective mitochondria fail to maintain the proton gradient across the inner mitochondrial membrane and are the main source of ROS in most cells (Figure 2). Under physiological conditions, 0.2–2% of the electrons in the electron transport chain do not follow the normal transfer but directly leak out of the electron transport chain and interact with oxygen to produce superoxide or hydrogen peroxide. Complexes I and III are considered to be the main sites for ROS production. In addition, NADPH
Mitochondria biogenesis
Mitochondrial numbers are a key determinant of mitochondrial function and the key mechanism to adapt to higher energy demand. Mitochondrial biogenesis is an important determinant of mitochondrial number. PGC1a is a master transcriptional regulator of mitochondrial biogenesis. Expression of PGC1a is lower in kidneys of patients with AKI and CKD [10]. Mice with genetic deletion of PCG1a appear healthy at baseline but show increased susceptibility to acute and chronic kidney injury [28]. At the
Mitochondria dynamics, shape, size, and turnover
Mitochondrial shape and size, which are controlled by fission and fusion, are other less well-understood determinants of function. Abnormalities in mitochondrial dynamics have been observed both in acute and chronic disease conditions [77]. Dynamin-related protein (DRP)1 is the master regulator of mitochondrial fission. Proximal-tubule-specific deletion of DRP1 or mdivi-1 treatment, a pharmacological inhibitor of DRP1, preserves mitochondrial structure, reduces oxidative stress, and protects
The role of mitochondria in controlling inflammation
Severe mitochondrial damage and defects in mitochondrial clearance can lead to a leakage of mtDNA into the cytosol. The exact mechanism of the mtDNA leakage is still not fully understood (Figure 4). BAK and BAX pores in the mitochondrial outer membrane can lead to inner mitochondrial membrane herniation and cytosolic release of mtDNA [6]. The presence of mtDNA in the cytosol is a sign of pathogenic infection and is recognized by the cytosolic nucleotide-sensing pathways. The nucleic acid
Apoptosis
The mitochondria play a key role in orchestrating a multitude of cell death mechanisms. Apoptosis is a noninflammatory cell death mechanism occurring without the rupture of the cell membrane. The release of cytochrome c from the mitochondria to the cytosol through BAX/BAK pores activates subsequent caspases such as caspase-9, followed by the activation of the execution caspases such as caspase-3 (Figure 5). Apoptosis has been observed in AKI and CKD and is likely a leading mechanism resulting
Concluding remarks
The kidney tubules have one of the highest mitochondrial densities to generate energy for the transport of large amounts of sodium and other solutes. Defects in mitochondrial biogenesis, dynamics, and mitophagy contribute to kidney disease development by the cells failing to meet the cellular energetic requirement. Mitochondrial damage has been widely recognized in AKI or CKD. Mitochondrial injury triggers multiple cell death mechanisms (apoptosis, necroptosis, pyroptosis, and ferroptosis)
Acknowledgments
This work was supported in the Susztak laboratory by the National Institute of Health NIH R01 DK087635, DK076077.
Declaration of Interests
The authors declare no competing interests.
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