Nitric oxide elevation in polytrauma is driven by oxygen radicals

Title:

Nitric oxide elevation in polytrauma is driven by oxygen radicals

Creator:

Beitl, E., Baňasová, A., Miková, D., and Hampl, V.

Identifier:

https://cdk.lib.cas.cz/client/handle/uuid:153fbed8-2812-48c5-a293-b07a6f33b03a
uuid:153fbed8-2812-48c5-a293-b07a6f33b03a

Subject:

nitric oxide, polytrauma, shock, N-acetyl-L-cysteine, reactive oxygen species, and antioxidant

Type:

article, model:article, and TEXT

Description:

A common problem in management of polytrauma – a simultaneous injury to more than one organ or organ system, at least one of them lethal without intervention – is a discrepancy between a relatively good initial state and a serious subsequent development. Since nitric oxide (NO) is produced in high quantities during tissue injury, we assumed that serum levels of NO (and its oxidation products, NOx) might serve as a prognostic marker of polytrauma severity. However, we found recently that NOx was increased in polytrauma, but not in the most severe cases. The present study was undertaken to test the hypothesis that serum NOx is reduced in severe polytrauma by concomitant overproduction of reactive oxygen species (ROS). Polytrauma was induced in rats under anesthesia by bilateral fracture of femurs and tibiae plus incision of the right liver lobe through laparotomy. Serum NOx was measured by chemiluminescence after hot acidic reduction. The role of ROS was assessed by treatment with an antioxidant, N-acetyl-L-cysteine (NAC). Experimental polytrauma elevated NOx from 11.0±0.7 to 23.8±4.5 ppb. This was completely prevented by NAC treatment (9.1±2.2 ppb). Serum NOx is elevated in severe polytrauma, and this is not reduced by ROS. On the contrary, ROS are necessary for the NOx elevation, probably because ROS produced by inflammatory cells activated by the polytrauma induce massive NO production.

Language:

English

Rights:

http://creativecommons.org/publicdomain/mark/1.0/
policy:public

Source:

Physiological research | 2017 Volume:66 | Number:Suppl 4

Harvested from:

CDK

Metadata only:

false