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Related Concept Videos

Cryo-electron Microscopy01:28

Cryo-electron Microscopy

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Conventional electron microscopy (EM) involves dehydration, fixation, and staining of biological samples, which distorts the native state of biological molecules and results in several artifacts. Also, the high-energy electron beam damages the sample and makes it difficult to obtain high-resolution images. These issues can be addressed using cryo-EM, which uses frozen samples and gentler electron beams. The technique was developed by Jacques Dubochet, Joachim Frank, and Richard Henderson, for...
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Related Experiment Video

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Cell Culture on Silicon Nitride Membranes and Cryopreparation for Synchrotron X-ray Fluorescence Nano-analysis
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Zinc Cations Uniquely Stabilize Cell Membrane for Cell Cryopreservation.

Xia Zheng1,2, Chuanbiao Zhang3, Huimei Cao1,4

  • 1Key Laboratory of Green Printing, Beijing National Laboratory for Molecular Science, Institute of Chemistry, Chinese Academy of Sciences, Beijing 100190, P. R. China.

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Summary

Researchers discovered zinc ions (Zn(II)) can protect red blood cells (RBCs) during cryopreservation, achieving high recovery rates without conventional cryoprotective agents. This novel approach enhances cell membrane stability and reduces post-thaw processing.

Keywords:
CryopreservationIon-specific effectMembrane fluidityRed blood cellsZinc(II)

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The CryoAPEX Method for Electron Microscopy Analysis of Membrane Protein Localization Within Ultrastructurally-Preserved Cells
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Area of Science:

  • Biomedical Engineering
  • Cell Biology
  • Materials Science

Background:

  • Conventional cryopreservation of red blood cells (RBCs) relies on high concentrations of cryoprotective agents (CPAs) like glycerol.
  • High CPA concentrations necessitate complex and time-consuming removal processes post-thaw.
  • The ice-controlling ability of CPAs is considered crucial for successful cryopreservation.

Purpose of the Study:

  • To investigate the potential of low concentrations of Zn(II) as an alternative to conventional CPAs for RBC cryopreservation.
  • To evaluate the efficacy of Zn(II) in maintaining RBC recovery rates and membrane integrity.
  • To explore the mechanism by which Zn(II) confers cryoprotection.

Main Methods:

  • Cryopreservation of RBCs using a minimal amount (0.039% w/w) of Zn(II).
  • Comparison of post-thaw recovery rates with conventional CPA methods.
  • Analysis of membrane fluidity and cell resilience to osmotic and mechanical stresses.
  • Investigation of Zn(II) interaction with lipid molecules in the cell membrane.

Main Results:

  • Achieved a comparable post-thaw recovery rate of approximately 95% using minimal Zn(II).
  • Eliminated the need for gradient washout procedures required for conventional CPAs.
  • Demonstrated that Zn(II) confers cryoprotection without possessing ice-controlling abilities.
  • Observed that Zn(II) maintains membrane fluidity by facilitating small, dynamic lipid clusters.

Conclusions:

  • Zn(II) offers a novel, efficient strategy for RBC cryopreservation, significantly simplifying the process.
  • The ion-specific effect of Zn(II) on stabilizing cell membranes presents a new paradigm in cryobiology.
  • Reversible structural tuning of biological samples using ions provides a promising approach to mitigate cryoinjury.