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Anticholinesterase Agents: Poisoning and Treatment01:26

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Strategies for Study of Neuroprotection from Cold-preconditioning
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Published on: September 2, 2010

Cryoprotectant toxicity neutralization.

Gregory M Fahy1

  • 121st Century Medicine, Inc., 14960 Hilton Drive, Fontana, CA 92336, USA. gfahy@21cm.com

Cryobiology
|June 9, 2009
PubMed
Summary
This summary is machine-generated.

Cryoprotectant toxicity neutralization (CTN) is key for successful cryopreservation. Recent studies show specific amides can block toxicity, but N-methylamides exhibit non-specific toxicity, impacting protein stability.

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Area of Science:

  • Cryobiology
  • Biochemistry
  • Cell Biology

Background:

  • Cryoprotectant toxicity limits successful cryopreservation of living systems.
  • Previous research on cryoprotectant toxicity neutralization (CTN) yielded conflicting results.
  • The concept of CTN involves one chemical mitigating the toxicity of another.

Purpose of the Study:

  • To investigate the phenomenon of cryoprotectant toxicity neutralization (CTN).
  • To explore the potential of various amides to neutralize the toxicity of other cryoprotectants.
  • To understand the mechanisms underlying CTN and cryoprotectant toxicity.

Main Methods:

  • Experiments involving competition between different amides and cryoprotectants like dimethyl sulfoxide (Me(2)SO), formamide, and urea.
  • Assessing toxicity by observing the effects of amides on model proteins.
  • Utilizing reducing agents to reverse specific toxic effects of Me(2)SO.

Main Results:

  • Dimethyl sulfoxide (Me(2)SO) was demonstrated to neutralize the toxicity of formamide, urea, and acetamide.
  • N-methylamides (N-methylformamide, N,N-dimethylformamide, N-methylacetamide) did not exhibit CTN with formamide or urea.
  • N-methylamides showed non-specific toxicity, with damaging concentrations similar to those denaturing model proteins.
  • Reducing agents could reverse toxicity effects of Me(2)SO related to sulfhydryl oxidation.

Conclusions:

  • Cryoprotectant toxicity neutralization (CTN) is a validated phenomenon with significant implications for cryopreservation.
  • The specific chemical structures of amides influence their ability to neutralize toxicity.
  • N-methylamides possess non-specific toxicity, potentially due to protein denaturation.
  • Further research into CTN mechanisms could lead to improved cryopreservation strategies.