Mitochondrial Photoactivation
Mitochondrial Photoactivation - Related Videos
05:02
Bimolecular Fluorescence Complementation-Coupled Photoactivated Localization Microscopy
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2025
This video describes BiFC-PALM ― a combination of photoactivated localization microscopy and bimolecular fluorescence complementation ― to assess protein-protein interactions. BiFC involves the fusion of two fluorescent protein fragments with two interacting proteins of interest. When the two proteins interact, the fragments are brought into proximity, which allows the two parts to come together and reconstitute a functional fluorescent protein. The fluorescence of a single fluorophore is...
11:20
An Integrated System to Remotely Trigger Intracellular Signal Transduction by Upconversion Nanoparticle-mediated Kinase Photoactivation
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Cited by 1 •
2017
In this protocol, caged protein kinase A (PKA), a cellular signal transduction bioeffector, was immobilized on a nanoparticle surface, microinjected into the cytosol, and activated by the upconverted UV light from near-infrared (NIR) irradiation, inducing downstream stress fiber disintegration in the cytosol.
02:59
Animal Mitochondrial Genetics
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2020
Among all the organelles in an animal cell, only mitochondria have their own independent genomes. Animal mitochondrial DNA is a double-stranded, closed-circular molecule with around 20,000 base pairs. Mitochondrial DNA is unique in that one of its two strands, the heavy, or H, -strand is guanine rich, whereas the complementary strand is cytosine rich and called the light, or L, -strand. Compared to nuclear DNA, mitochondrial DNA has a very low percentage of non-coding regions and is marked by...
08:40
An Optimized Protocol to Analyze Glycolysis and Mitochondrial Respiration in Lymphocytes
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Cited by 38 •
2016
The study of metabolism is becoming increasingly relevant to immunological research. Here, we present an optimized method for measuring glycolysis and mitochondrial respiration in mouse splenocytes, and T and B lymphocytes.
04:33
Fluorescence Photoactivation Imaging of Neurofilament Transport in Myelinated Mouse Axons
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2025
Source: Boyer, N. P. et. al., Imaging and Analysis of Neurofilament Transport in Excised Mouse Tibial Nerve. J. Vis. Exp. (2020) This video demonstrates the fluorescence photoactivation method to analyze neurofilament transport in myelinated axons of peripheral nerves. By tracking photoactivated green fluorophore-tagged neurofilaments, the technique provides insights into axonal transport in neurodegenerative diseases.
FAQs
Mitochondrial chromophores, particularly components of the respiratory chain, absorb the applied light. This interaction can influence electron transport and alter related mitochondrial properties, including membrane potential, ATP production, and reactive oxygen species generation. Studying these linked changes helps researchers determine how light-dependent effects propagate through energy metabolism rather than treating each mitochondrial measurement as an isolated event.
Changes in respiratory-chain activity can modify the generation of reactive oxygen species, molecules that participate in cellular redox regulation and stress responses. By controlling the light stimulus, researchers can examine how mitochondrial activity shifts redox balance and how those shifts relate to cell survival or broader stress signaling. This provides a way to connect mitochondrial function with cellular responses.
Membrane potential and ATP production provide complementary information about mitochondrial energy function. Membrane potential reflects a light-sensitive property associated with respiratory-chain activity, while ATP production indicates consequences for cellular energy availability. Evaluating both alongside electron transport and reactive oxygen species generation helps researchers characterize whether photoactivation changes mitochondrial metabolism, redox behavior, or both.
A typical study applies low-intensity light to a biological preparation such as cultured cells or tissue, then examines mitochondrial and cellular responses. Researchers can assess electron transport, membrane potential, ATP production, reactive oxygen species generation, and related stress signals after exposure. This controlled sequence allows light-dependent mitochondrial changes to be associated with altered cell function or survival.
These experiments can reveal how mitochondrial activity connects energy metabolism, redox balance, and communication with other cellular systems. Measurements of electron transport, membrane potential, ATP production, and reactive oxygen species help describe the direction and breadth of the response. The resulting data can clarify how mitochondrial changes influence cellular function, stress responses, and survival.
Mitochondrial photoactivation supports research on tissue repair, neurobiology, and metabolic dysfunction. In cultured cells and tissues, investigators use light-dependent changes to examine mitochondrial signaling and their relationship to cell performance. These applications are relevant because they connect a controllable mitochondrial perturbation with broader questions about tissue responses, neural biology, and impaired cellular metabolism.