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Cell Size

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Cell sizes vary widely among and within organisms. Bacterial cells range between 1-10 micrometers (μm)and are considerably smaller than most eukaryotic cells. The smallest bacteria are 0.1 μm in diameter—about a thousand times smaller than eukaryotic cells, which typically range from 10-100 μm.
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When the fitness of a trait is influenced by how common it is (i.e., its frequency) relative to different traits within a population, this is referred to as frequency-dependent selection. Frequency-dependent selection may occur between species or within a single species. This type of selection can either be positive—with more common phenotypes having higher fitness—or negative, with rarer phenotypes conferring increased fitness.
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Brick sizing plays a crucial role in construction, influencing both the aesthetics and structural integrity of buildings. Bricks are defined by three dimensions: width, thickness, and length. They are commonly designed to fit modular measurements, typically in multiples of 4 inches or 8 inches in width, to facilitate uniform construction and compatibility with other building materials.
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Preparation of Exosomes for siRNA Delivery to Cancer Cells
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Size-dependent cellular uptake of exosomes.

Federica Caponnetto1, Ivana Manini2, Miran Skrap3

  • 1School of Life Sciences, University of Lincoln, Lincoln, UK; Department of Medical and Biological Sciences, University of Udine, Udine, Italy.

Nanomedicine : Nanotechnology, Biology, and Medicine
|December 21, 2016
PubMed
Summary

Exosome preparation methods impact their therapeutic potential. Polymer-based precipitation yields smaller exosomes, enhancing cellular uptake and glioblastoma cell motility compared to ultracentrifugation.

Keywords:
AFMCellular uptakeExosomesFlow cytometryGASCGlioma

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Area of Science:

  • Biotechnology
  • Nanomedicine
  • Cell Biology

Background:

  • Exosomes show therapeutic promise due to their ability to elicit cellular responses.
  • Their nanovesicular structure makes them ideal for drug and nucleic acid delivery.
  • The impact of exosome isolation techniques on their biological activity requires further investigation.

Purpose of the Study:

  • To investigate how different exosome preparation methods affect cellular uptake and biological responses.
  • To compare ultracentrifugation and polymer-based precipitation for isolating exosomes from glioma-associated stem cells.
  • To correlate exosome particle size distribution with their effects on glioblastoma cell behavior.

Main Methods:

  • Isolation of exosomes from glioma-associated stem cell supernatants using ultracentrifugation and polymer-based precipitation.
  • Determination of particle size distribution for each isolation method.
  • Assessment of exosome uptake, proliferation, and migration in glioblastoma cell cultures.

Main Results:

  • Polymer-based precipitation resulted in smaller exosome particle sizes compared to ultracentrifugation.
  • Exosomes isolated via polymer-based precipitation exhibited faster cellular uptake.
  • Increased cellular motility was observed in glioblastoma cells treated with exosomes from polymer-based precipitation.

Conclusions:

  • Exosome isolation methods significantly influence particle characteristics and biological effects.
  • Smaller exosome size, achieved through polymer-based precipitation, enhances cellular uptake and motility.
  • Exosome size distribution is a critical factor influencing their therapeutic efficacy in glioblastoma treatment.