Attenuation of the cortisol response to stress in female rainbow trout chronically exposed to dietary selenomethionine

Wiseman, Steve; Thomas, Jith K.; McPhee, Landon; Hursky, Olesya; Raine, Jason C.; Pietrock, Michael; Giesy, John P.; Hecker, Markus; Janz, David M.

doi:10.1016/j.aquatox.2011.09.002

Cited by 36 publications

(17 citation statements)

References 38 publications

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“…Elevated dietary and tissue Se concentrations from adult and juvenile fishes collected from both Se‐contaminated sites and laboratory studies have been associated with alterations in energy homeostasis and the physiological stress response . In the present study, triglyceride, glycogen, and cortisol levels displayed no substantial changes that corresponded with SeMet treatment.…”

Section: Discussioncontrasting

confidence: 55%

“…Therefore, oxidative damage, depleted energy, and diminished protein synthesis within hepatocytes could be interfering with an active metabolic process required for Se biotransformation or elimination, and could subsequently be the reason for a greater accumulation in the liver tissue of females fed the 94.2 mg Se/g dry mass diet in the present study. Elevated dietary and tissue Se concentrations from adult and juvenile fishes collected from both Se-contaminated sites and laboratory studies have been associated with alterations in energy homeostasis and the physiological stress response [17][18][19][20]37,38]. In the present study, triglyceride, glycogen, and cortisol levels displayed no substantial changes that corresponded with SeMet treatment.…”

Section: Effects Of Dietary Selenium Exposure In Adult Xenopuscontrasting

confidence: 56%

“…The USEPA proposes egg–ovary and muscle tissue thresholds for Se of 15.8 μg Se/g and 11.3 μg Se/g dry mass, respectively, for freshwater fish ; hence, these criteria should be protective for early life stage amphibians as well. In addition, X. laevis adult females exposed to elevated dietary Se levels exhibited minimal to no toxic effects related to body condition indices, energetic status, and physiological stress response even at concentrations well above (94.2 μg Se/g dry mass) those producing comparable sublethal toxic effects in fish (<30 μg Se/g dry mass) . To date, investigations into the toxic effects of Se on amphibians indicate that adult female amphibians and their progeny are relatively more tolerant to elevated dietary and in ovo Se levels compared with most fish.…”

Section: Discussionmentioning

confidence: 99%

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Tissue-specific selenium accumulation and toxicity in adult female Xenopus laevis chronically exposed to elevated dietary selenomethionine

Massé

Muscatello

Hogan

et al. 2016

Environmental Toxicology and Chemistry

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Selenium (Se) is a developmental toxicant that is also capable of altering the bioenergetic and endocrine status of adult fish. To date, aquatic ecotoxicological research has predominantly focused on the toxic effects of Se in fish, and minimal information has been published related to amphibians. The objective of the present study was to investigate the potential toxicity associated with chronically elevated dietary Se consumption in adult female amphibians utilizing the model species Xenopus laevis. Adult X. laevis females were fed a diet augmented with L-selenomethionine at measured concentrations of 0.7 µg Se/g (control), 10.9 µg Se/g, 30.4 µg Se/g, or 94.2 µg Se/g dry mass for 68 d, after which they were bred with untreated males. Ovary, egg, liver, muscle, and blood samples were collected from female frogs after completion of the exposure period and subsequent breeding to ascertain Se tissue distribution, muscle and liver triglyceride and glycogen levels, and plasma cortisol concentrations. The concentrations of Se measured in female tissues excluding the liver were significantly increased in proportion with dietary intake. No significant differences were observed among treatment groups with respect to biometric indices, energy stores, or stress response of adult female X. laevis after Se exposure, which suggests that this amphibian species is capable of accumulating substantial quantities of this element in their tissues with no adverse effects on fitness. Environ Toxicol Chem 2017;36:1047-1055. © 2016 SETAC.

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Section: Discussioncontrasting

confidence: 55%

Section: Effects Of Dietary Selenium Exposure In Adult Xenopuscontrasting

confidence: 56%

Section: Discussionmentioning

confidence: 99%

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Tissue-specific selenium accumulation and toxicity in adult female Xenopus laevis chronically exposed to elevated dietary selenomethionine

Massé

Muscatello

Hogan

et al. 2016

Environmental Toxicology and Chemistry

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“…While fish can habituate to some chronic stressors, sustained plasma cortisol levels similar to those used in this study have been observed in response to diverse stressors of anthropogenic and natural origins. For example, chronic exposure to aluminum, copper, selenium or low environmental pH can result in prolonged elevations in plasma cortisol levels (Craig et al 2009, Wiseman et al 2011, Kennedy & Picard 2012, Grassie et al 2013. In salmonids, sustained increases in cortisol levels are also associated with social subordination (Gilmour et al 2005) and with specific phases of the life cycle such as smolting (Nilsen et al 2008) and sexual maturation (Fuzzen et al 2011).…”

Section: Discussionmentioning

confidence: 99%

Chronic cortisol and the regulation of food intake and the endocrine growth axis in rainbow trout

Madison

Tavakoli

Krämer

et al. 2015

Journal of Endocrinology

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To gain a better understanding of the mechanisms by which cortisol suppresses growth during chronic stress in fish, we characterized the effects of chronic cortisol on food intake, mass gain, the expression of appetite-regulating factors, and the activity of the GH/IGF axis. Fish given osmotic pumps that maintained plasma cortisol levels at w70 or 116 ng/ml for 34 days were sampled 14, 28 and 42 days post-implantation. Relative to shams, the cortisol treatments reduced food intake by 40-60% and elicited marked increases in liver leptin (lep-a1) and brain preoptic area (POA) corticotropin-releasing factor (crf) mRNA levels. The cortisol treatments also elicited 40-80% reductions in mass gain associated with increases in pituitary gh, liver gh receptor (ghr), liver igfI and igf binding protein (igfbp)-1 and -2 mRNA levels, reduced plasma GH and no change in plasma IGF1. During recovery, while plasma GH and pituitary gh, liver ghr and igfI gene expression did not differ between treatments, the high cortisol-treated fish had lower plasma IGF1 and elevated liver igfbp1 mRNA levels. Finally, the cortisol-treated fish had higher plasma glucose levels, reduced liver glycogen and lipid reserves, and muscle lipid content. Thus, our findings suggest that the growth-suppressing effects of chronic cortisol in rainbow trout result from reduced food intake mediated at least in part by increases in liver lep-a1 and POA crf mRNA, from sustained increases in hepatic igfbp1 expression that reduce the growth-promoting actions of the GH/IGF axis, and from a mobilization of energy reserves.

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“…Wiseman et al . () also noted attenuation of the cortisol response to an acute stressor in female O. mykiss that had been chronically exposed to dietary selenomethionine. It is also possible that the apparent attenuation of the HPI‐axis in 80 dph C. nebulosus could be due to habituation to anthropogenic activity or frequently occurring events such as handling and netting within the hatchery environment.…”

Section: Discussionmentioning

confidence: 98%

Effects of release procedures on the primary stress response and post‐release survival and growth of hatchery‐reared spotted seatrout Cynoscion nebulosus

Guest

Rakocinski

Evans

et al. 2016

Journal of Fish Biology

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To help explain the apparent poor post-release success of hatchery-reared (HR) spotted seatrout Cynoscion nebulosus, this study examined the effects of handling, transport and release procedures on the stress response of two age classes [48 and 80 day post-hatch (dph)] of HR C. nebulosus, as measured by cortisol concentrations and the post-release survival and growth of 48 and 80 dph HR C. nebulosus. As a proxy for stress, tissue cortisol was measured at various times during the handling, tagging (80 dph), transport, acclimation and release process. To consider the implications of the pre-release stressors, growth and survival were monitored in separate field experiments for each age class of acclimated post-transport C. nebulosus using control C. nebulosus that only experienced anaesthesia, transport, acclimation and a net release v. experimental C. nebulosus that underwent the entire routine procedure, including anaesthesia, tagging, transport, acclimation and gravity release through a pipe. For 48 dph C. nebulosus, mean cortisol varied significantly throughout handling and transport, increasing more than six-fold from controls before decreasing in mean concentration just prior to release. For 80 dph C. nebulosus, cortisol varied throughout handling, tagging and transport, first increasing more than three-fold compared with control C. nebulosus, before decreasing and rising slightly just prior to release. For 48 dph C. nebulosus within field enclosures, survival was high and similar for control and experimental groups; experimental C. nebulosus, however, were shorter, lighter and lower in condition than control C. nebulosus. For 80 dph C. nebulosus within field enclosures, fewer experimental C. nebulosus survived and those that did survive were of lower condition than C. nebulosus from the control group. Small untagged C. nebulosus may survive the release procedure better than larger C. nebulosus carrying a coded-wire tag. These findings document some ways in which pre-release practices may translate into detrimental effects on post-release success of HR C. nebulosus.

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Attenuation of the cortisol response to stress in female rainbow trout chronically exposed to dietary selenomethionine

Cited by 36 publications

References 38 publications

Tissue-specific selenium accumulation and toxicity in adult female Xenopus laevis chronically exposed to elevated dietary selenomethionine

Tissue-specific selenium accumulation and toxicity in adult female Xenopus laevis chronically exposed to elevated dietary selenomethionine

Chronic cortisol and the regulation of food intake and the endocrine growth axis in rainbow trout

Effects of release procedures on the primary stress response and post‐release survival and growth of hatchery‐reared spotted seatrout Cynoscion nebulosus

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