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Updated: Dec 9, 2025
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Using Real-Time Cell Metabolic Flux Analyzer to Monitor Osteoblast Bioenergetics
Published on: March 1, 2022
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Malic Enzyme Couples Mitochondria with Aerobic Glycolysis in Osteoblasts
Wen-Chih Lee1, Xing Ji1, Itzhak Nissim2
1Translational Research Program in Pediatric Orthopedics, The Children's Hospital of Philadelphia, PA 19104, USA.
Cell Reports
|September 9, 2020
Summary
Osteoblasts utilize aerobic glycolysis for energy, converting glucose to lactate. Mitochondrial malic enzyme (Me2) is crucial for this process, impacting bone cell function.
Area of Science:
- Biochemistry
- Cell Biology
- Metabolic Research
Background:
- The metabolic pathways governing osteoblast function are not fully understood.
- Osteoblasts are critical for bone formation and maintenance.
Purpose of the Study:
- To elucidate the metabolic program of osteoblasts during differentiation.
- To investigate the role of aerobic glycolysis and mitochondrial enzymes in osteoblast function.
Main Methods:
- Murine calvarial cell cultures.
- In vivo 13C-glucose tracing in mice.
- RNA sequencing (RNA-seq) analysis.
- Me2 gene knockdown experiments.
Main Results:
- Osteoblast differentiation increases glucose consumption and lactate production while decreasing oxygen consumption.
- Aerobic glycolysis provides ~80% of ATP in mature osteoblasts.
- Mitochondrial malic enzyme (Me2) is upregulated during differentiation and essential for osteoblast proliferation and differentiation.
Conclusions:
- Osteoblasts rely heavily on aerobic glycolysis for ATP production.
- Mitochondrial malic enzyme (Me2) plays a key role in coupling mitochondrial function with aerobic glycolysis in osteoblasts.
- Me2 is critical for osteoblast proliferation and differentiation.
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