Energy Metabolism
Energy Metabolism - Related Videos
00:52
What is Metabolism?
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2019
Overview Metabolism represents all of the chemical activity in a cell, including reactions that build molecules (anabolism) and those that break molecules down (catabolism). Anabolic reactions require energy, whereas catabolic reactions provide it. Thus, metabolism describes how cells transform energy through a variety of chemical reactions, which are often made more efficient with the help of enzymes. Metabolism Is the Sum of All of the Chemical Reactions That Take Place in an Organism
01:21
Free Energy
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2019
Free energy—abbreviated as G for the scientist Gibbs who discovered it—is a measurement of useful energy that can be extracted from a reaction to do work. It is the energy in a chemical reaction that is available after entropy is accounted for. Reactions that take in energy are considered endergonic and reactions that release energy are exergonic. Plants carry out endergonic reactions by taking in sunlight and carbon dioxide to produce glucose and oxygen. Animals, in turn, break down the...
01:26
Activation Energy
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2019
Activation energy is the minimum amount of energy necessary for a chemical reaction to move forward. The higher the activation energy, the slower the rate of the reaction. However, adding heat to the reaction will increase the rate, since it causes molecules to move faster and increase the likelihood that molecules will collide. The collision and breaking of bonds represents the uphill phase of a reaction and generates the transition state. The transition state is an unstable high-energy state...
04:41
Real-Time Monitoring of Energy Metabolism in Human NK Cells Using an Extracellular Flux Analyzer
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2025
This video demonstrates the method to analyze energy metabolism in activated human NK cells using an extracellular flux analyzer. Different inhibitors of the electron transport chain complexes impact ATP synthesis, which is measured through the oxygen consumption rate or OCR, providing insights into cellular metabolism and bioenergetics.
10:19
An Introduction to Cell Metabolism
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2023
In cells, critical molecules are either built by joining together individual units like amino acids or nucleotides, or broken down into smaller components. Respectively, the reactions responsible for this are referred to as anabolic and catabolic. These reactions require or produce energy typically in the form of a “high-energy” molecule called ATP. Together, these processes make up “Cell Metabolism,” and are hallmarks of healthy, living cells.JoVE’s introduction to cell metabolism briefly...
FAQs
A proton gradient across the mitochondrial membrane links electron transport to ATP production. Electron transport establishes a difference in proton concentration, and oxidative phosphorylation uses stored electrochemical energy to drive ATP synthesis. Drugs that interfere with either gradient formation or its use can reduce cellular ATP availability, helping explain impaired function and mitochondrial toxicity.
Glucose, fatty acids, and other substrates provide alternative inputs into the energy-producing network. Their breakdown feeds glycolysis and the citric acid cycle, which then connect with electron transport and oxidative phosphorylation. Because these stages are linked, a drug that changes substrate processing or downstream energy conversion may alter ATP production and cellular function. This perspective helps interpret metabolic drug effects.
They are sequential but not interchangeable stages. Glycolysis processes glucose, while oxidative phosphorylation uses the proton gradient generated through electron transport to drive ATP synthesis. This distinction identifies different points at which energy production can be altered. In pharmacology, separating these stages helps connect a drug’s effect on a pathway component with its broader impact on cellular energy availability.
Changes in ATP production can modify how cells maintain normal function, so they may also change the response to a drug. Pharmacology uses this relationship to connect pathway effects with observed drug responses rather than treating metabolism as an isolated process. The framework is especially useful when a compound alters cellular energy production and the resulting response depends on energy availability.
Mitochondrial toxicity matters because interference with mitochondrial energy production can compromise ATP availability and cellular function. Examining energy metabolism therefore provides a way to relate a drug’s action to potential metabolic injury. This connection is important in pharmacology because drug effects on mitochondria may appear not only as pathway changes, but also as broader loss of cellular performance.
Knowledge of energy metabolism supports therapies for metabolic disorders, cancer, and conditions involving impaired mitochondrial function. Pathway understanding helps show how altered nutrient processing, electron transport, or oxidative phosphorylation relates to disease biology and treatment response. This makes metabolism a useful pharmacological context for linking molecular pathways with therapeutic strategies.