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The cobalamin precursor cobinamide detoxifies nitroprusside-generated cyanide.

Kate E Broderick1, Maheswari Balasubramanian, Adriano Chan

  • 1Department of Medicine, University of California at San Diego, 9500 Gilman Drive, La Jolla, CA 92093-0652, USA.

Experimental Biology and Medicine (Maywood, N.J.)
|May 29, 2007
PubMed
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Cobinamide effectively neutralizes cyanide toxicity from sodium nitroprusside treatment. This compound shows promise as a safe adjunct therapy, preserving nitric oxide (NO) effectiveness in patients.

Area of Science:

  • Biochemistry
  • Pharmacology
  • Toxicology

Background:

  • Sodium nitroprusside is a critical treatment for hypertensive emergencies and acute heart failure.
  • Nitroprusside releases nitric oxide (NO) but also toxic cyanide ions, limiting its therapeutic use.
  • Hydroxocobalamin can scavenge cyanide but has a lower binding affinity compared to cobinamide.

Purpose of the Study:

  • To evaluate cobinamide as a cyanide scavenger for sodium nitroprusside therapy.
  • To assess cobinamide's efficacy in neutralizing cyanide ions in vitro and in vivo.
  • To determine if cobinamide affects the vasodilatory action of nitric oxide (NO).

Main Methods:

  • Testing cobinamide's cyanide-binding capacity.
  • Administering cobinamide with nitroprusside in cultured mammalian cells, Drosophila melanogaster, and mice.

Related Experiment Videos

  • Measuring NO concentrations and physiological responses in the presence of cobinamide and nitroprusside.

    • Main Results:

    • Cobinamide effectively neutralized cyanide ions released by nitroprusside across various models.
    • Cobinamide demonstrated a significantly higher affinity for cyanide than cobalamin.
    • At relevant concentrations, cobinamide did not impede NO levels or nitroprusside's therapeutic effects.

    Conclusions:

    • Cobinamide is a potent cyanide scavenger with potential therapeutic benefits.
    • Cobinamide shows promise as a safe and effective adjunct to sodium nitroprusside treatment.
    • Further research may establish cobinamide as a valuable tool in managing nitroprusside therapy.