Agilent Seahorse XF Analyzers for Real-Time Cell Metabolic Analysis

   Real-time cell metabolic analysis is a live-cell technique enabled by Agilent Seahorse XF technology that measures mitochondrial respiration and glycolysis simultaneously in real time, revealing how cells produce and use energy to support activation, proliferation and other cellular functions.

 ATP level shows how much ATP is present in a cell at a specific moment, while ATP production rate measures how quickly ATP is being generated. Seahorse XF Real-Time ATP Rate Assay Kits simultaneously quantify ATP production from both mitochondria and glycolysis, providing a dynamic picture of cellular energy metabolism.

Oxygen Consumption Rate (OCR) is a direct measurement of mitochondrial respiration. It indicates how much oxygen cells consume through the electron transport chain during aerobic respiration and serves as a key indicator of mitochondrial function.

The Substrate Oxidation Stress Test measures how cells switch between fatty acids, glucose/pyruvate and glutamine under increased energy demand, revealing cellular fuel dependency and metabolic flexibility.

The Glycolytic Rate Assay quantifies glycolysis in real time using glycoPER, a parameter that corrects for acidification caused by mitochondrial CO₂. This provides a more accurate and dynamic measurement than traditional endpoint lactate assays.

 The Glycolysis Stress Test is a semi-quantitative ECAR-based assay that measures glycolytic capacity under basal and stressed conditions. Because it requires glucose starvation before the assay, it may not fully represent physiological glycolysis. The Glycolytic Rate Assay is the preferred alternative.

OCR is a dynamic measurement of mitochondrial function and respiration, while mitochondrial mass simply indicates the amount of mitochondria present in a cell. Mitochondrial mass often remains constant even when mitochondrial function changes significantly.

OCR reflects electron transport chain activity and changes rapidly with cellular metabolism. Mitochondrial membrane potential measures the proton gradient across the inner mitochondrial membrane, which generally remains more stable and is therefore less sensitive to metabolic changes.

Mitochondrial dysfunction is a major cause of drug toxicity and late-stage drug failure. Real-time Seahorse XF analysis detects mitochondrial dysfunction early, while the Seahorse XF Mito Tox Assay provides a Mitochondrial Toxicity Index (MTI) to quantify both the extent and mechanism of toxicity.

Seahorse assays use solid-state sensors to create a temporary microchamber above live cells, enabling label-free measurement of OCR and PER/ECAR. Up to four compounds can be injected automatically during a 60–90 minute assay, and results are analyzed using Wave software or Seahorse Analytics.

Metabolic reprogramming is involved in many diseases. It drives cancer through the Warburg effect, regulates immune cell activation and T-cell function, contributes to neurodegeneration and aging through mitochondrial dysfunction, influences stem cell fate, and plays a central role in diabetes, obesity and insulin resistance.