Are sex steroids involved in the sexual growth dimorphism in Eurasian perch juveniles?

Mandiki, S.N.M.; Houbart, Marc; Babiak, Igor; Vandeloise, Eric; Gardeur, Jean-Noël; Kestemont, Patrick

doi:10.1016/j.physbeh.2003.10.016

Cited by 37 publications

(21 citation statements)

References 35 publications

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“…However, dietary 17-β estradiol decreased growth in the sunshine bass (Davis and Ludwig, 2004) and Atlantic halibut (Hippoglossus hippoglossus, Hendry et al, 2003) but did not affect appetite, food conversion efficiency or the specific growth rate in the red sea bream (Woo et al, 1993). Similar results using cocoa implants were obtained in the Eurasian perch (Mandiki et al, 2004), in which the highest dietary dose had negative effects on specific growth rate and food efficiency but no effect on food intake. These results were not reproducible since subsequent experiments using similar doses of 17-β estradiol showed an increased food intake level and enhanced specific growth rate in female Eurasian perch but not in males (Mandiki et al, 2005).…”

Section: Introductionsupporting

confidence: 56%

“…The response to external androgens seems to be species-dependent since experiments in the channel catfish (Ictalurus punctatus) showed that the oral administration of 17-α-methyltestosterone deterred the growth of juvenile animals (Simone, 1990). Similar results using cocoa implants of 17-α-methyltestosterone have recently been reported in the Eurasian perch (Perca fluviatilis), in which reductions in the food intake level and food efficiency were responsible for the decreased growth rate (Mandiki et al, 2004). In contrast, the dietary administration of testosterone did not affect the growth rate in the above species but significantly attenuated the food intake with the concomitant increase in the food utilization (Mandiki et al, 2005).…”

Section: Introductionmentioning

confidence: 58%

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Sex steroid-induced inhibition of food intake in sea bass (Dicentrarchus labrax)

et al. 2008

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This study was conducted to test the sensitivity to gonadal steroids of the systems regulating food intake in sea bass. Animals were treated with silastic implants containing 17-β-estradiol or testosterone. Self-feeding was recorded for 31 days using computerized demand feeders and unfed-pellet recovery systems. Both steroids strongly decreased selffeeding levels, feed efficiency and specific growth rates. The linear growth of fish treated with testosterone was higher than in 17-β-estradiol treated fish. In the second experiment, fish were treated with lower 17-β-estradiol doses and 11-keto-androstenedione, a precursor of the main fish androgen (11-keto-testosterone). The results demonstrated a dose-response effect of estrogen and no effect of non-aromatizable androgens on food intake or growth performance. The inhibitory effect of testosterone on food intake seems to be mediated by its aromatization to estradiol, while linear growth promotion is mediated by the androgen "per se". Data suggest that gonadal steroids may be involved in the seasonal feeding pattern of sea bass. The results demonstrate the sensitivity of the mechanisms regulating food intake to estrogenic compounds and point to the risk of including feed containing estrogenic substances in fish diets as well as the risk involved in exposure to "estrogenic environments".

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Section: Introductionsupporting

confidence: 56%

Section: Introductionmentioning

confidence: 58%

Sex steroid-induced inhibition of food intake in sea bass (Dicentrarchus labrax)

et al. 2008

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“…On one hand, methyltestosterone was reported to increase growth in tilapia (Riley et al 2002, Sparks et al 2003. On the other hand, both testosterone and methyltestosterone were demonstrated to decrease growth in perch (Mandiki et al 2004, Mandiki et al 2005. These ambivalent actions of androgens are reflected in the effects of the steroids on the GH level in fish.…”

Section: Discussionmentioning

confidence: 99%

The co-existence of two growth hormone receptors in teleost fish and their differential signal transduction, tissue distribution and hormonal regulation of expression in seabream

Jiao

Huang²,

Chan³

et al. 2006

Journal of Molecular Endocrinology

148

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Two genomic contigs of putative growth hormone receptors (GHRs) were identified in fugu and zebrafish genomes by in silico analysis, suggesting the presence of two GHR subtypes in a single teleost species. We have tested this hypothesis by cloning the full-length cDNA sequence of a second GHR subtype from the black seabream in which the first GHR subtype had been previously reported by us. In addition, we had also cloned the sequences of both GHR subtypes from two other fish species, namely the Southern catfish and the Nile tilapia. Phylogenetic analysis of known GHR sequences from various vertebrates revealed that fish GHRs cluster into two distinct clades, viz. GHR1 and GHR2. One clade (GHR1), containing 6 to 7 extracellular cysteine residues, is structurally more akin to the non-teleost GHRs. The other clade (GHR2), containing only 4 to 5 extracellular cysteine residues, is unique to teleosts and is structurally more divergent from the non-teleost GHRs. In addition, we had examined the biological activities of both GHR subtypes from seabream using a number of reporter transcription assays in cultured eukaryotic cells and demonstrated that both of them were able to activate the Spi 2·1 and -casein promoters upon receptor stimulation in a ligand specific manner. In contrast, only GHR1 but not GHR2 in seabream could trigger the c-fos promoter activity, indicating that the two GHR subtypes possess some differences in their signal transduction mechanisms. Also, the expression of GHR2 is significantly higher than GHR1 in many tissues of the seabream including the gonad, kidney, muscle, pituitary and spleen. In vivo hormone treatment data indicated that cortisol upregulated hepatic GHR1 expression in seabream but not GHR2, whereas testosterone decreased hepatic GHR2 expression but not GHR1. On the other hand, hepatic expression of both GHR1 and GHR2 in seabream was decreased by estradiol treatment.

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“…Plasma concentrations of estradiol-17β (E2), 11-keto-testosterone (11-KT) and testosterone (T) were assayed using a radioimmunoassay (RIA) after two extractions with cyclohexane-ethyl acetate according to Fostier and Jalabert (1986) and adapted by Mandiki et al (2004). All of the samples and standards were assayed in duplicate.…”

Section: Sex Steroid Analysesmentioning

confidence: 99%

Assessment of the health status of wild fish inhabiting a cotton basin heavily impacted by pesticides in Benin (West Africa)

Agbohessi

Toko

Ouédraogo

et al. 2015

Science of The Total Environment

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Are sex steroids involved in the sexual growth dimorphism in Eurasian perch juveniles?

Cited by 37 publications

References 35 publications

Sex steroid-induced inhibition of food intake in sea bass (Dicentrarchus labrax)

Sex steroid-induced inhibition of food intake in sea bass (Dicentrarchus labrax)

The co-existence of two growth hormone receptors in teleost fish and their differential signal transduction, tissue distribution and hormonal regulation of expression in seabream

Assessment of the health status of wild fish inhabiting a cotton basin heavily impacted by pesticides in Benin (West Africa)

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