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Tissue Homogenization and Cell Lysis01:32

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Tissue homogenization involves disintegrating tissue architecture and lysing cells, and is an early step in isolating and analyzing cellular components. The method used for homogenization depends on the sample type, the amount of sample available, the analyte to be obtained, and the sensitivity of the method. These methods are broadly classified as mechanical and non-mechanical methods.
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Cell separation was first achieved in 1964 by S. H. Seal, who separated large tumor cells from the smaller blood cells using filtration. Two years later, Pohl and Hawk performed experiments on how cells respond differently to a nonuniform electric field based on the cell type. Such observations were the inception of cell separation methods, which allow isolating a single cell type from a heterogeneous sample.
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The resolution of a mass spectrometer depends on the efficiency of separating ions with different ion masses. The mass of an atom is approximated to the sum of the masses of protons and neutrons inside, considering the masses of protons and neutrons as equal. However, the masses of the proton (1.6726 × 10−24 g) and neutron (1.6749 × 10−24 g) are not truly equal. There is a minor error in the expression of atomic masses relative to the simplest atom of hydrogen. For...
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A racemic mixture, or racemate, is an equimolar mixture of enantiomers of a molecule that can be separated using their unique interaction with chiral molecules or media. Racemic mixtures are denoted by the (±)- prefix. This ‘optical rotation descriptor’ applies to the whole solution of a racemic mixture rather than a specific stereoisomer. Enantiomers typically have the same physical and chemical properties. Hence, they are not easily separable. However, enantiomers can exhibit...
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The homogenate obtained after cell lysis contains various membrane-bound organelles that can be further separated into pure fractions by subcellular fractionation. These isolates are used to study specific cellular components, analyze localized protein activity, and are even employed in diagnostics. Fractionation is typically achieved using centrifugation methods, the most common being density-gradient and differential centrifugation.
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Heteromultivalency Enhances Resolution in Cellular Mechanical Sorting.

Jialu Zhang1,2, Yihao Huang1, Shuang Wan1

  • 1The MOE Key Laboratory of Spectrochemical Analysis and Instrumentation, the Key Laboratory of Chemical Biology of Fujian Province, State Key Laboratory of Physical Chemistry of Solid Surfaces, Department of Chemical Biology, College of Chemistry and Chemical Engineering, School of Mathematical Sciences, Xiamen University, Xiamen, Fujian, 361005, China.

Angewandte Chemie (International Ed. in English)
|September 30, 2025
PubMed
Summary
This summary is machine-generated.

Researchers developed novel heteromultivalent ligands to precisely measure cell mechanics. This breakthrough enables sensitive detection of subtle cell differences and improved sorting of cell populations based on mechanical properties.

Keywords:
HeteromultivalencyLigand assemblyMechanical phenotypesMicrofluidic cell sortingSorting resolution

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Area of Science:

  • Biophysics
  • Molecular Engineering
  • Cell Biology

Background:

  • Cells interact with their environment via receptor-ligand forces, crucial for development and disease.
  • Current methods for profiling cell mechanics lack precision due to limitations in ligand design.
  • Discrete valency changes in conventional ligands hinder the continuous modulation of binding avidity.

Purpose of the Study:

  • To introduce a bivariate strategy for constructing heteromultivalent ligands with independently tunable affinity and valency.
  • To overcome the limitations of traditional homovalent ligands in achieving continuous avidity modulation.
  • To enhance the sensitivity and resolution of mechanical cell profiling.

Main Methods:

  • Co-assembly of two aptamers with distinct binding affinities on a DNA nanoscaffold.
  • Stoichiometric modulation to precisely control ligand avidity.
  • Application of heteromultivalent ligands for mechanical force measurements and cell sorting.

Main Results:

  • Generation of a continuous avidity spectrum for ligands, surpassing discrete homovalent systems.
  • Enhanced sensitivity in force measurements, revealing subtle mechanical differences in cells.
  • Successful sequential sorting of phenotypically similar cell subpopulations using flow rate adjustments.

Conclusions:

  • Avidity modulation is critical for engineering multivalent interactions and mechanical cell profiling.
  • Heteromultivalent ligands offer superior advantages over homovalent strategies for precise mechanical cell analysis.
  • This approach advances the ability to discern and sort cells based on nuanced mechanical phenotypes.