... cells, there was no effect of ACTH or RU486 on transforming growth factor-β or interleukin-6 levels; however, both cytokines decreased with the 4 day fasting progression. Similarly, ACTH did not impact protein oxidation, lipid peroxidation or antioxidant enzymes, but plasma isoprostanes and catalase...

... relationship with other stress-related biomarkers, and how the incidence of an immune challenge during long-term stress could affect an individual’s overall stress response. We investigated here the relationship between basal and post-acute stress fecal cortisol metabolite (FC) with different antioxidant...

... Hermes-Lima , M. and Storey , K. B. ( 1993 ). Antioxidant defenses in the tolerance of freezing and anoxia by garter snakes . Am. J. Physiol. Regul. Integr. Comp. Physiol.   265 , R646 - R652 . 10.1152/ajpregu.1993.265.3.R646 Hermes-Lima , M. and Zenteno-Savın , A. ( 2002...

... males should favour the antioxidant protection of their somatic tissues, and subordinate males should favour the antioxidant protection of their sperm. We tested this hypothesis by experimentally infecting wild-caught house sparrows Passer domesticus with Coccidia Isopora sp., an internal parasite known...

... oxidative stress, and proposes the ‘redox signalling hypothesis’ of life history. Antioxidants Life history Redox Reproduction Senescence Signalling There is considerable evidence across a wide range of taxa that oxidative (or redox) status (see Glossary) plays a central role...

... and accelerated aging. We contrasted markers of oxidative damage with antioxidant profiles across age and sex for propulsive (longissismus dorsi) and maneuvering (pectoralis) muscles of Weddell seals to determine whether previously observed morphological senescence is associated with oxidative stress...

...Norma Martínez-Lendech; Marcela Osorio-Beristain; Bernardo Franco; Mario Pedraza-Reyes; Armando Obregón; Jorge Contreras-Garduño ABSTRACT In invertebrates, it has recently been reported that secondary sexual characteristics (SSCs) reflect the antioxidant defense of their bearers...

... by dietary polyunsaturated fatty acids (PUFA), which, although prone to oxidative damage, may limit mitochondrial ROS production and increase antioxidant capacity. We examined how flight muscles manage oxidative stress during flight, and whether dietary long-chain PUFA influence ROS management or damage...

... of developmental stage (prepupa, pupa, pharate adult) and treatment (Ax1st, Ax2nd, Ax3rd, Ax3x, Nx) on oxidative damage and total antioxidant capacity were analyzed using two-way ANOVAs. Post hoc tests were performed using Tukey's HSD. A proportional hazards model was used to determine the effect of treatment...

... for assessing the impact of these proteins on oxidative stress. We tested the hypothesis that the lack of oxygen-binding proteins may reduce oxidative stress. Levels and activity of pro-oxidants and small-molecule and enzymatic antioxidants, and levels of oxidized lipids and proteins in the liver, oxidative...

... is converted into ice. Whilst in the frozen state, their hearts cease to pump blood, causing their cells to experience ischemia, which can dramatically increase the production of reactive oxygen species within the cell. To overcome this, wood frogs have elevated levels of glutathione, a primary antioxidant. We...

... . 10.1093/icb/icp028 Alonso-Alvarez , C. , Bertrand , S. , Devevey , G. , Gaillard , M. , Prost , J. , Faivre , B. and Sorci , G. ( 2004 ). An experimental test of the dose-dependent effect of carotenoids and immune activation on sexual signals and antioxidant activity...

..., which may cause oxidative stress by degrading key cell components, while playing essential roles in cell homeostasis. Given the delicate equilibrium between pro- and antioxidants in fueling acclimation responses, the need for a thorough understanding of the relationship between salinity-induced...

... antioxidants. Cortisol caused a significant decrease in growth rates but did not affect predation risk. Over-winter survival in the stream was associated with low levels of oxidative stress and glutathione. Thus, oxidative stress may be a mechanism by which elevated cortisol causes negative physiological...

...Ensiyeh Ghanizadeh-Kazerouni; Craig E. Franklin; Frank Seebacher ABSTRACT Ultraviolet B radiation (UV-B) is an important environmental driver that can affect locomotor performance negatively by inducing production of reactive oxygen species (ROS). Prolonged regular exercise increases antioxidant...

... and -independent mitochondrial proteases, and antioxidants) in tolerance to intermittent hypoxia or anoxia in three species of marine bivalves: hypoxia-tolerant hard clams ( Mercenaria mercenaria ) and oysters ( Crassostrea virginica ), and a hypoxia-sensitive subtidal scallop ( Argopecten irradians ). In clams...

..., and show a strong antioxidant activity in vitro . Studies of avian species feeding on berries suggest that dietary flavonoids have health-promoting effects and may enhance the expression of melanin-based plumage traits. These effects are probably mediated by the antioxidant activity of flavonoids. However...

... success or survival, but the physiological mechanisms underlying these costs are still obscure. To test for a role of oxidative stress, we measured oxidative damage to lipids and proteins in liver, heart, kidneys and muscles, as well as the level of antioxidants (total glutathione and catalase...

...Marie Vaugoyeau; Beatriz Decencière; Samuel Perret; Filiz Karadas; Sandrine Meylan; Clotilde Biard ABSTRACT In the context of sexual and natural selection, an allocation trade-off for carotenoid pigments may exist because of their obligate dietary origin and their role both in the antioxidant...

... in oxidative damage, an increase in ceruloplasmin (which is upregulated in response to oxidative damage) and a decrease in thiol antioxidants. We also compared the blood oxidative stress level of reproducing birds with that of non-reproducing birds, a crucial aspect that most studies have invariably failed...