Reduced resistance to oxidative stress during reproduction as a cost of early-life stress
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Stress exposure during early-life development can have long-term consequences for a variety of biological functions including oxidative stress. The link between early-life stress and oxidative balance is beginning to be explored and previous studies have focused on this link in adult non-breeding or immature individuals. However, as oxidative stress is considered as the main physiological mechanism underlying the trade-off between self-maintenance and investment in reproduction, it is necessary to look at the consequences of early-life stress on oxidative status during reproduction. Here, we investigated the effects of exposure to pre- and/or post-natal stress on oxidative balance during reproduction under benign or stressful environmental conditions in an avian model species, the Japanese quail. We determined total antioxidant status (TAS), total oxidant status (TOS) and resistance to a free-radical attack in individual exposed to pre-natal stress, post-natal stress or both and in control individuals exposed to none of the stressors. TAS levels decreased over time in all females that reproduced under stressful conditions. TOS decreased between the beginning and the end of reproductive period in pre-natal control females. In all females, resistance to a free-radical attack decreased over the reproductive event but this decrease was more pronounced in females from a pre-natal stress development. Our results suggest that pre-natal stress may be associated with a higher cost of reproduction in terms of oxidative stress. These results also confirm that early-life stress can be associated with both benefits and costs depending of the life-history stage or environmental context.
Zimmer , C & Spencer , K A 2015 , ' Reduced resistance to oxidative stress during reproduction as a cost of early-life stress ' Comparative Biochemistry and Physiology Part A: Molecular & Integrative Physiology , vol 183 , pp. 9-13 . DOI: 10.1016/j.cbpa.2014.12.032
Comparative Biochemistry and Physiology Part A: Molecular & Integrative Physiology
Copyright © 2014 Elsevier Inc. All rights reserved. NOTICE: this is the author’s version of a work that was accepted for publication in Comparative Biochemistry and Physiology - Part A: Molecular and Integrative Physiology. Changes resulting from the publishing process, such as peer review, editing, corrections, structural formatting, and other quality control mechanisms may not be reflected in this document. Changes may have been made to this work since it was submitted for publication. A definitive version was subsequently published in Comparative Biochemistry and Physiology - Part A: Molecular and Integrative Physiology, 183 (2015) doi: 10.1016/j.cbpa.2014.12.032
This study was funded by a BBSRC David Phillips Research Fellowship to K.A. Spencer.
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