Opposing effects of oxidative challenge and carotenoids on antioxidant status and condition-dependent sexual signalling

Tomášek, Oldřich; Gabrielová, B.; Kačer, P.; Maršík, Petr; Svobodová, J.; Syslová, K.; Vinkler, M.; Albrecht, Tomáš

doi:https://dx.doi.org/10.1038/srep23546

Number of the records: 1

Opposing effects of oxidative challenge and carotenoids on antioxidant status and condition-dependent sexual signalling

1.

SYSNO ASEP	0458721
Document Type	J - Journal Article
R&D Document Type	Journal Article
Subsidiary J	Článek ve WOS
Title	Opposing effects of oxidative challenge and carotenoids on antioxidant status and condition-dependent sexual signalling
Author(s)	Tomášek, Oldřich (UBO-W)_{RID, ORCID, SAI} Gabrielová, B. (CZ) Kačer, P. (CZ) Maršík, Petr (UEB-Q)_{RID, ORCID} Svobodová, J. (CZ) Syslová, K. (CZ) Vinkler, M. (CZ) Albrecht, Tomáš (UBO-W)_{RID, SAI, ORCID}
Number of authors	8
Source Title	Scientific Reports. - : Nature Publishing Group - ISSN 2045-2322 Roč. 6, č. 23546 (2016), s. 23546
Number of pages	9 s.
Language	eng - English
Country	GB - United Kingdom
Keywords	finch Taenopygia guttata ; plumage coloration ; in-vivo ; information content ; immune activation ; zebra finches ; life span ; stress ; expression ; capacity
Subject RIV	EG - Zoology
R&D Projects	GAP506/12/2472 GA ČR - Czech Science Foundation (CSF)
	GA15-11782S GA ČR - Czech Science Foundation (CSF)
Institutional support	UBO-W - RVO:68081766 ; UEB-Q - RVO:61389030
UT WOS	000372576400001
EID SCOPUS	84961572853
DOI	10.1038/srep23546
Annotation	Several recent hypotheses consider oxidative stress to be a primary constraint ensuring honesty of condition-dependent carotenoid-based signalling. The key testable difference between these hypotheses is the assumed importance of carotenoids for redox homeostasis, with carotenoids being either antioxidant, pro-oxidant or unimportant. We tested the role of carotenoids in redox balance and sexual signalling by exposing adult male zebra finches (Taeniopygia guttata) to oxidative challenge (diquat dibromide) and manipulating carotenoid intake. As the current controversy over the importance of carotenoids as antioxidants could stem from the hydrophilic basis of commonly-used antioxidant assays, we used the novel measure of in vivo lipophilic antioxidant capacity. Oxidative challenge reduced beak pigmentation but elicited an increase in antioxidant capacity suggesting resource reallocation from signalling to redox homeostasis. Carotenoids counteracted the effect of oxidative challenge on lipophilic (but not hydrophilic) antioxidant capacity, thereby supporting carotenoid antioxidant function in vivo. This is inconsistent with hypotheses proposing that signalling honesty is maintained through either ROS-induced carotenoid degradation or the pro-oxidant effect of high levels of carotenoid-cleavage products acting as a physiological handicap. Our data further suggest that assessment of lipophilic antioxidant capacity is necessary to fully understand the role of redox processes in ecology and evolution.
Workplace	Institute of Vertebrate Biology
Contact	Hana Slabáková, slabakova@ivb.cz, Tel.: 543 422 524
Year of Publishing	2017

Number of the records: 1