Organelle Separation
Organelle Separation - Related Videos
15:39
Studying Organelle Dynamics in B Cells During Immune Synapse Formation
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Cited by 8 •
2019
Herein we describe two approaches to characterize cell polarization events in B lymphocytes during the formation of an IS. The first, involves quantification of organelle recruitment and cytoskeleton rearrangements at the synaptic membrane. The second is a biochemical approach, to characterize changes in composition of the centrosome, which undergoes polarization to the immune synapse.
07:29
Separating Protein with SDS-PAGE
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2023
Sodium Dodecyl Sulfate Poly-Acrylamide Gel Electrophoresis, or SDS-PAGE, is a widely-used technique for separating mixtures of proteins based on their size and nothing else. SDS, an anionic detergent, is used to produce an even charge across the length of proteins that have been linearized. By first loading them into a gel made of polyacrylamide and then applying an electric field to the gel, SDS-coated proteins are then separated. The electric field acts as the driving force, drawing the SDS...
01:43
The Movement of Organelles and Vesicles
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2023
In eukaryotic cells, cytoskeletal filaments such as actin, microtubules, and intermediate filaments form a mesh-like cytoskeletal network. These filaments serve as tracks for transporting cellular cargo. Specialized motor proteins use the chemical energy stored in adenosine triphosphate (ATP) for this transport. During interphase, microtubules are polarized, with the plus-end towards the cell periphery and the minus-end towards the cell center. Two microtubule-associated motor proteins,...
03:00
Tracking Axonal Transport of Organelles in Motor Neurons Using a Microfluidic Device
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2025
This video demonstrates a method for tracking axonal transport in motor neurons using a microfluidic chamber system. It involves culturing mouse embryonic spinal cord tissues in polymer-coated wells with nutrient medium to induce axonal growth. The movement of fluorescent dye-stained organelles in live imaging, confirms the bidirectional axonal transport.
03:24
Organelle Dynamics in B Lymphocytes following Activation with Antigen-Coated Beads
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2025
In this video, we describe a method to study the organelle dynamics in B lymphocytes following their activation with antigen-coated microbeads.
FAQs
The separation sequence exploits differences in how organelles sediment. During differential centrifugation, larger or denser compartments sediment at different rates from smaller or less dense ones, allowing the disrupted mixture to be divided into fractions. These fractions can then be examined separately rather than treating the cell contents as a single sample.
Density-gradient centrifugation serves as a purification step after initial fractionation. It further resolves collected material according to density, reducing the mixing of organelles that may remain together after differential centrifugation. This matters when interpreting measurements, because enzyme, protein, membrane, or genetic-material signals can be assigned more confidently to an organelle-enriched fraction.
Controlled cell lysis is important because separation begins with a mixed preparation created by disrupting cells. The lysis stage determines whether cellular compartments are released into that preparation for subsequent sedimentation and fractionation. In practice, the quality of this starting mixture affects how useful later organelle-specific analyses will be.
A typical workflow starts by disrupting cells, then applies differential centrifugation to divide the mixture into fractions with different sedimentation behavior. Researchers may subject these fractions to density-gradient centrifugation to improve purity before analyzing their contents. Keeping fractionation and analysis as distinct stages helps connect measured signals with particular cellular compartments.
Separated fractions provide access to organelle-associated enzymes, proteins, membranes, and genetic material. Measuring these components lets investigators compare the molecular properties of different cellular compartments rather than relying only on whole-cell measurements. The resulting data can reveal changes in compartment function or composition associated with experimental conditions, disease mechanisms, drugs, or genetic changes.
Within biology, organelle separation supports investigations of metabolism, intracellular transport, and signaling, as well as toxicology. It is also useful for examining how drugs or genetic changes alter cell function. Because the approach produces compartment-enriched material, researchers can study whether an observed molecular change is associated with a particular cellular location.