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Polymorphic ROS scavenging revealed by CCCP in a lizard.

Mats Olsson1, Mark Wilson, Caroline Isaksson

  • 1School of Biological Sciences, University of Wollongong, Wollongong, NSW, 2522, Australia. molsson@uow.edu.au

Die Naturwissenschaften
|March 25, 2009
PubMed
Summary

Carotenoid antioxidants did not reduce reactive oxygen species (ROS) in lizards, even when ROS levels were experimentally increased. This challenges the link between carotenoids, antioxidant capacity, and mate quality.

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Area of Science:

  • * Animal behavior and physiology
  • * Oxidative stress and antioxidant research
  • * Evolutionary biology and sexual selection

Background:

  • * Antioxidants, such as carotenoids, are hypothesized to scavenge reactive oxygen species (ROS), influence mate choice, and extend lifespan.
  • * Previous research in the polychromatic lizard (Ctenophorus pictus) indicated carotenoids do not lower circulating ROS or improve color traits.
  • * A more rigorous test is needed to assess carotenoid effects on ROS when ROS levels are experimentally elevated.

Purpose of the Study:

  • * To experimentally elevate reactive oxygen species (ROS) levels in Ctenophorus pictus using carbonyl cyanide 3-chlorophenylhydrazone.
  • * To determine if carotenoid supplementation can depress these experimentally induced ROS levels.
  • * To evaluate the link between carotenoids, ROS depression, and mate quality.

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Main Methods:

  • * Administered carbonyl cyanide 3-chlorophenylhydrazone to induce a threefold increase in superoxide (SO) formation.
  • * Supplemented diets with carotenoids to assess their effect on elevated ROS levels.
  • * Analyzed the interaction between carotenoid treatment, male color morph (red vs. yellow), and ROS levels.

Main Results:

  • * Carotenoid supplementation showed no significant effect on mean superoxide (SO) levels, even under induced high ROS conditions.
  • * A significant interaction was observed between carotenoid treatment and male color.
  • * Red males exhibited higher ROS levels compared to yellow males.

Conclusions:

  • * The study found no evidence that carotenoids reduce ROS levels, even when ROS production is significantly increased.
  • * The results question the proposed link between carotenoid-based antioxidant capacity and mate quality.
  • * Differences in ROS levels between red and yellow males may relate to pigment composition and carotenoid allocation to coloration versus antioxidant functions.