Direct Inhibitory Effects of Carbon Monoxide on Six Venoms Containing Fibrinogenolytic Metalloproteinases.

Abstract:

:Since the introduction of antivenom administration over a century ago to treat venomous snake bite, it has been the most effective therapy for saving life and limb. However, this treatment is not always effective and not without potential life-threatening side effects. We tested a new paradigm to abrogate the plasmatic anticoagulant effects of fibrinogenolytic snake venom metalloproteinases (SVMP) by inhibiting these Zn+2 -dependent enzymes directly with carbon monoxide (CO) exposure. Assessment of the fibrinogenolytic effects of venoms collected from the Arizona black rattlesnake, Northern Pacific rattlesnake, Western cottonmouth, Eastern cottonmouth, Broad-banded copperhead and Southern copperhead on human plasmatic coagulation kinetics was performed with thrombelastography in vitro. Isolated exposure of all but one venom (Southern copperhead) to CO significantly decreased the ability of the venoms to compromise coagulation. These results demonstrated that direct inhibition of transition metal-containing venom enzymes by yet to be elucidated mechanisms (e.g. CO, binding to Zn+2 or displacing Zn+2 from the catalytic site, CO binding to histidine residues) can in many instances significantly decrease fibrinogenolytic activity. This new paradigm of CO-based inhibition of the anticoagulant effects of SVMP could potentially diminish haemostatic compromise in envenomed patients until antivenom can be administered.

authors

Nielsen VG,Losada PA

doi

10.1111/bcpt.12654

subject

Has Abstract

pub_date

2017-02-01 00:00:00

pages

207-212

issue

2

eissn

1742-7835

issn

1742-7843

journal_volume

120

pub_type

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