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Related Concept Videos

Studying the Cytoskeleton01:17

Studying the Cytoskeleton

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The cytoskeletal architecture can be studied using different microscopic and biochemical techniques. Electron microscopy was instrumental in discovering the cytoskeletal architecture around the 1960s, which allowed obtaining structural information at a high-resolution level. However, the sample preparation procedure often limits this ability in biological samples. Several protocols have been developed over the years to optimize sample preparation. In one of the protocols known as rotary...
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Microtubules are hollow cylindrical filaments having a diameter of approximately 25 nm and a length that varies from 200 nm to 25 μm. GTP-bound tubulin subunits form αβ-heterodimers for microtubule assembly. These core building blocks interact longitudinally, polymerizing into protofilaments. The protofilaments then interact with one another through lateral bonding forces to form stable cylindrical microtubules. These cylindrical filaments are dynamic as they undergo repeated...
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The cytoskeleton is a complex dynamic structure performing varied functions based on cellular requirements. The adaptability of the individual filaments in the cytoskeleton determines their ability to perform various functions within the cell. It can undergo rapid reorganization during processes like cell division or remain stable for several hours as in the interphase. The adaptability of these filaments depends on stringent regulatory mechanisms. The microfilament and microtubules of the...
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A migrating cell changes its shape during the cyclic events of attachment and detachment from the substratum and repositions the cell organelles correspondingly. These complex events are orchestrated by the dynamic cytoskeletal network comprising actin filaments, intermediate filaments, and microtubules. Cytoskeletal crosstalk — the direct and indirect communication between the different components — is crucial for this coordination. Direct communication involves various linker...
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The destabilization of microtubules can occur during different stages of the microtubule lifecycle, such as nucleation or elongation. It can take place at either end of the microtubule or in the microtubule lattices as a whole. The lifespan of individual microtubules within a cell varies according to the cell type and stage of the cell cycle. During interphase, the lifespan of the microtubule is about 30 minutes, while during cell division, it is about 15 minutes. In axonal microtubules of...
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Different fluorescence-based techniques are used to study the protein dynamics in living cells. These techniques include FRAP, FRET, and PET.
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Intracellular nanoparticle dynamics affected by cytoskeletal integrity.

Martha E Grady1, Emmabeth Parrish2, Matthew A Caporizzo2

  • 1Department of Anesthesiology and Critical Care, School of Medicine, University of Pennsylvania, USA. David.Eckmann@uphs.upenn.edu and Department of Materials Science and Engineering, School of Engineering and Applied Science, University of Pennsylvania, USA.

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Intracellular diffusion of nanoparticles is enhanced by disrupting the actin cytoskeleton. This finding impacts nanoparticle-based drug delivery and intracellular trafficking efficiency.

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Area of Science:

  • Cell Biology
  • Biophysics
  • Nanotechnology

Background:

  • The cytoplasm is a crowded environment limiting molecular and organelle diffusion.
  • Cytoskeletal integrity influences intracellular transport dynamics and reaction rates.

Purpose of the Study:

  • To investigate the relationship between intracellular diffusion and cytoskeletal integrity.
  • To understand how cytoskeleton heterogeneity affects nanoparticle mobility within cells.

Main Methods:

  • Microinjection of quantum dots into fibrosarcoma cells and fibroblasts.
  • Fluorescence tracking of quantum dot diffusion in the cytoplasm.
  • Analysis of particle displacement distributions to infer diffusion characteristics.

Main Results:

  • Quantum dot mobility was significantly enhanced in fibrosarcoma cells compared to fibroblasts.
  • Disrupting the actin network in fibroblasts increased quantum dot mobility.
  • Cytoskeletal heterogeneity directly influences intracellular particle diffusion.

Conclusions:

  • Intracellular nanoparticle diffusion is enhanced by actin network disruption.
  • Altering cytoskeletal integrity has significant implications for drug delivery efficacy.
  • Understanding diffusion dynamics is crucial for optimizing nanoparticle-based therapies.