Metabolic Breakpoint Identification
Metabolic Breakpoint Identification - Related Videos
02:53
Identification of Recombinant Vaccinia Virus-Infected Cells Using Metabolic and Fluorescent Selection
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2026
Source: Marzook, N. B., et al., Methodology for the Efficient Generation of Fluorescently Tagged Vaccinia Virus Proteins. J. Vis. Exp. (2014)This video demonstrates the generation of recombinant vaccinia viruses using plasmid-mediated homologous recombination in infected epithelial cells. Fluorescent and metabolic markers enable the selection and identification of viruses expressing tagged proteins.
05:41
Metabolic Profile Analysis of Zebrafish Embryos
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Cited by 42 •
2013
Zebrafish represent a powerful vertebrate model that has been under-utilised for metabolic studies. Here we describe a rapid way to measure the in vivo metabolic profile of developing zebrafish that allows the comparison of different mitochondrial function parameters between genetically or pharmacologically manipulated embryos, thereby increasing the applicability of this organism.
12:11
Identification of Metabolically Active Bacteria in the Gut of the Generalist Spodoptera littoralis via DNA Stable Isotope Probing Using 13C-Glucose
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Cited by 15 •
2013
The active bacterial community associated with the gut of Spodoptera littoralis, was determined by stable-isotope-probing (SIP) coupled to pyrosequencing. Using this methodology, identification of the metabolically active bacteria species within the community was done with high resolution and precision.
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...
08:28
Metabolic Labeling
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2023
Metabolic labeling is used to probe the biochemical transformations and modifications that occur in a cell. This is accomplished by using chemical analogs that mimic the structure of natural biomolecules. Cells utilize analogs in their endogenous biochemical processes, producing compounds that are labeled. The label allows for the incorporation of detection and affinity tags, which can then be used to elucidate metabolic pathways using other biochemical analytical techniques, such as SDS-PAGE...
FAQs
The most informative measurements are oxygen uptake, carbon dioxide production, ventilation, lactate concentration, and respiratory exchange ratio. Each reflects a different aspect of the changing energetic state: gas exchange describes aerobic activity, ventilation captures respiratory responses, lactate indicates glycolytic activity, and respiratory exchange ratio helps characterize fuel use. Researchers can examine these variables during a graded metabolic test.
An inflection point provides a measurable marker for a transition in metabolic behavior rather than relying only on the absolute workload. Its location indicates when the balance among aerobic energy production, glycolytic activity, or substrate oxidation changes noticeably. This helps researchers compare energetic responses across workloads and between individuals exposed to similar metabolic demands.
Changes in the breakpoint variables offer biochemical evidence that substrate use and pathway contributions are shifting. Oxygen uptake and carbon dioxide production relate to aerobic energy production, while lactate concentration provides information about glycolytic activity. Respiratory exchange ratio contributes additional information about fuel use, allowing the metabolic transition to be interpreted through several complementary measurements.
The breakpoint can vary with the workload or physiological condition being tested, because increasing energetic demand changes the relative contribution of metabolic pathways and fuel sources. Individual responses also differ, so two people may show transitions at different points. Comparing measurements across graded workloads helps distinguish these response patterns from a single isolated value.
A typical workflow applies progressively changing workloads or metabolic conditions while tracking selected physiological and biochemical variables. Researchers record oxygen uptake, carbon dioxide production, ventilation, lactate concentration, or respiratory exchange ratio, then examine the resulting measurements for an inflection point. The identified location is linked to the workload or condition at which the transition occurs.
The result should be treated as a transition marker tied to the measured workload or physiological condition, not as a complete description of metabolism by itself. Its interpretation depends on which variables were tracked, because gas exchange, ventilation, lactate, and respiratory exchange ratio provide different evidence. Comparing these measurements clarifies the nature of the energetic shift.
The approach supports exercise assessment, training prescription, metabolic disease research, and comparisons of individual responses to changing energetic demands. In biochemistry, it helps characterize substrate oxidation, glycolytic activity, and aerobic energy production. Researchers can therefore use breakpoint measurements both to describe physiological performance and to investigate how metabolic behavior changes across conditions.