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Related Experiment Video

Updated: Jun 13, 2026

Generation of Patient-Derived Podocytes from Skin Biopsies
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Generation of Patient-Derived Podocytes from Skin Biopsies

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Bioenergetic characterization of mouse podocytes.

Yoshifusa Abe1, Toru Sakairi, Hiroshi Kajiyama

  • 1Kidney Disease Section, National Institute of Diabetes and Digestive and Kidney Diseases, National Institutes of Health, Bethesda, Maryland 20892-1268, USA.

American Journal of Physiology. Cell Physiology
|May 7, 2010
PubMed
Summary

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This study investigated the energy production in mouse podocytes, which are important for kidney function. The researchers measured how much oxygen the cells used and how much acid they produced, using a special instrument called the Seahorse XF24 analyzer. They found that mitochondria, the energy factories in the cells, were the main source of energy. Glycolysis, another energy-producing process, contributed less. When they blocked mitochondrial function with a chemical called FCCP, oxygen use and acid production increased significantly. Combining FCCP with a glycolysis inhibitor reduced ATP levels by over 85%. The study also showed that mitochondrial respiration accounted for about 75% of total cellular respiration. These findings suggest that mitochondria play a key role in maintaining energy balance in podocytes.

Area of Science:

  • Cellular metabolism in renal physiology
  • Mitochondrial bioenergetics in mouse models

Background:

Podocytes are essential for kidney filtration, but their energy metabolism remains poorly understood. Prior research has shown that mitochondrial dysfunction can lead to podocyte injury. However, the baseline bioenergetic profile of these cells has not been fully described. This gap motivated the need to quantify mitochondrial and glycolytic contributions to podocyte energy production. Understanding these mechanisms could help clarify how energy imbalances contribute to kidney disease. No prior work had resolved the relative roles of mitochondrial respiration and glycolysis in podocytes. This study aimed to fill that knowledge gap. The absence of baseline data limited previous investigations into podocyte metabolism. Establishing these parameters is crucial for future studies on podocyte injury and repair.

Purpose Of The Study:

This study aimed to characterize the bioenergetic profile of mouse podocytes. The researchers wanted to determine the relative contributions of mitochondrial respiration and glycolysis to energy production in these cells. They used a transformed mouse podocyte cell line and a Seahorse XF24 analyzer to measure oxygen consumption and acidification rates. The goal was to quantify baseline metabolic activity and how it changes with mitochondrial uncoupling. The study also sought to assess the impact of glycolytic inhibition on ATP levels. Understanding these dynamics could help identify potential therapeutic targets. The researchers focused on ATP synthesis and proton leak as key indicators. Their findings may inform future studies on podocyte metabolism and injury.

Keywords:
Podocyte energy metabolismMitochondrial function in kidney cellsCellular respiration in miceATP production in podocytes

Frequently Asked Questions

The study found that mitochondria are the primary source of energy in mouse podocytes, with glycolysis playing a smaller role.

The researchers used the Seahorse XF24 Extracellular Flux Analyzer to measure OCR and ECAR in transformed mouse podocytes.

FCCP was used to uncouple electron transport from ATP generation, which increased OCR and ECAR to 360% and 840% of control levels.

The combination reduced ATP content by over 85%, indicating a significant impact on energy production.

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Main Methods:

The researchers used a Seahorse XF24 Extracellular Flux Analyzer to measure OCR and ECAR in transformed mouse podocytes. They tested the effects of mitochondrial inhibitors like oligomycin, rotenone, and FCCP on oxygen consumption and acidification. Glycolytic inhibition was assessed using 2-deoxyglucose and oxamate. ATP content was measured after treatment with these compounds. The study also included primary mouse podocytes to confirm the findings. The researchers analyzed OCR and ECAR under different metabolic conditions. They compared baseline values with those after inhibitor application. Replication in primary cells ensured the results were not cell line-specific.

Main Results:

Basal OCR and ECAR were 55.2 pmol/min and 3.1 milli-pH units/min, respectively. Oligomycin reduced OCR to 45% of baseline, indicating 55% of oxygen consumption was coupled to ATP synthesis. Rotenone reduced OCR to 25% of baseline, suggesting 75% of respiration was mitochondrial. FCCP increased OCR and ECAR to 360% and 840% of control levels. FCCP plus rotenone reduced ATP by 60%, while 2-deoxyglucose reduced it by 35%. Combining 2-deoxyglucose with FCCP or rotenone reduced ATP by over 85%. Oxamate and 2-deoxyglucose had no effect on ECAR, and 2-deoxyglucose did not affect OCR. FCCP increased OCR with substrates like lactate, glucose, and palmitate.

Conclusions:

The study concludes that mitochondria are the primary source of energy in mouse podocytes. Glycolysis contributes less to overall energy production. Mitochondrial respiration accounts for about 75% of total cellular respiration. Approximately 55% of mitochondrial oxygen consumption is coupled to ATP synthesis. The remaining 25% is due to proton leak. Glycolytic inhibition reduces ATP levels but has minimal impact on OCR or ECAR. FCCP-induced uncoupling increases OCR with various substrates. These findings suggest that mitochondrial function is critical for podocyte energy homeostasis.

They replicated the experiments in primary mouse podocytes and obtained similar results.

The study suggests that mitochondrial respiration accounts for about 75% of total cellular respiration in podocytes.