mRNA expression patterns for GH, PRL, SL, IGF-I and IGF-II during altered feeding status in rabbitfish, Siganus guttatus

Ayson, Felix G.; Jesus-Ayson, Evelyn Grace T. de; Takemura, Akihiro

doi:10.1016/j.ygcen.2006.08.001

Cited by 70 publications

(31 citation statements)

References 50 publications

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“…Rainbow trout fed in the morning exhibited post prandial GH peaks within 3-6 h following feeding whereas those fed later in the day did not display such a peak in GH levels (Reddy and Leatherland 1994) and rainbow trout fed during the night had higher mean plasma GH amounts when compared to those fed in the morning (Gélineau et al 1996). However, in rainbow trout, no significant differences in plasma GH levels were observed during feeding in the morning or late afternoon (Gomez et al 1996) and recently a similar finding was also reported for rabbit fish whereby the daily expression pattern of pituitary GH mRNA remained unchanged regardless of whether food was given in the morning or in the afternoon (Ayson et al 2007). A final consideration involves the effect of diet composition on fish GH levels.…”

Section: Nutritional Stressmentioning

confidence: 65%

Modulation of fish growth hormone levels by salinity, temperature, pollutants and aquaculture related stress: a review

Deane

Woo

2008

Rev Fish Biol Fisheries

149

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The focus of this review is on the importance and regulation of fish growth hormone (GH), during exposure to stress. Alterations in environmental salinity impose osmoregulatory stress on fish and upon exposure to increased salinities GH has been shown to be important in maintaining hypoosmoregulatory function. Whilst studies mainly on salmonids, demonstrate that GH essentially performs a role as a seawater adapting hormone a clear correlation of elevated GH with growth and isoosmotic salinity exposure has been identified from studies on sparids. Variations in water temperature have been shown to modulate fish GH with the overall consensus of highest levels of GH during the warmer seasons of the year, suggesting an important role for GH during the temperature acclimatization process, but whether this relates to growth is unclear. Environmentally important pollutants, including xenoestrogens and heavy metals have been shown to affect GH mediated mechanisms, in fish, possibly via interference with the GH receptor and/or GH transcription, whereas aquacultural related stressors such as handling, confinement/overcrowding and nutritional stress have also been shown to affect GH levels. In addition the impact of aquacultural related stressors can also predispose fish to disease leading to chronic suppression of GH. Finally, GH has been recently demonstrated to exert an anti-apoptotic effect in fish cells, when exposed to chemical stress, providing evidence that GH can also serve as a protective agent.

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Section: Nutritional Stressmentioning

confidence: 65%

Modulation of fish growth hormone levels by salinity, temperature, pollutants and aquaculture related stress: a review

Deane

Woo

2008

Rev Fish Biol Fisheries

149

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“…Recent studies show that teleost fishes including salmonids, sea bream, carp, catfish, eels, rabbitfish, sea bass, and hybrid striped bass, as well as the dogfish, an elasmobranch, differ from mammals in that liver igf2 gene expression and plasma Igf2 levels are stimulated by GH and respond to metabolic status (Shamblott et al 1995, Tse et al 2002, Vong et al 2003a, Peterson et al 2004, Carnevali et al 2005, Gabillard et al 2006, Wilkinson et al 2006, Ayson et al 2007, Terova et al 2007, Gahr et al 2008, Moriyama et al 2008a, b, Picha et al 2008b, Ponce et al 2008, Devlin et al 2009, Peterson & Waldbieser 2009, Eppler et al 2010, Pierce et al 2010. In primary cultured coho salmon hepatocytes, insulin directly increased igf2 mRNA, and strongly increased the response of igf2 mRNA to GH, but suppressed the response of igf1 mRNA to GH (Pierce et al 2005(Pierce et al , 2010.…”

Section: Introductionmentioning

confidence: 99%

Differential regulation of Igf1 and Igf2 mRNA levels in tilapia hepatocytes: effects of insulin and cortisol on GH sensitivity

Pierce

Breves²,

Moriyama³

et al. 2011

Journal of Endocrinology

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Igf1 and Igf2 stimulate growth and development of vertebrates. In mammals, liver-derived endocrine Igf1 mediates the growth promoting effects of GH during postnatal life, whereas Igf2 stimulates placental and fetal growth and is not regulated by GH. Insulin enhances Igf1 production by the mammalian liver directly, and by increasing hepatocyte sensitivity to GH. We examined the regulation of igf1 and igf2 mRNA levels by GH, insulin, and cortisol, and the effects of insulin and cortisol on GH sensitivity in primary cultured hepatocytes of tilapia, a cichlid teleost. GH increased mRNA levels of both igf1 and igf2 in a concentration-related and biphasic manner over the physiological range, with a greater effect on igf2 mRNA level. Insulin increased basal igf2 mRNA level, and strongly increased GH-stimulated igf2 mRNA level, but slightly reduced basal igf1 mRNA level and did not affect GH-stimulated igf1 mRNA level. Cortisol inhibited GH stimulation of igf1, but increased GH stimulation of igf2 mRNA level. The synergistic effect of insulin and GH on igf2 mRNA level was confirmed in vivo. These results indicate that insulin and cortisol differentially modulate the response of igf1 and igf2 mRNA to GH in tilapia hepatocytes, and suggest that the regulation of liver Igf2 production differs between fish and mammals. Regulation of liver Igf2 production in fish appears to be similar to regulation of liver Igf1 production in mammals.

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“…Similarly to the SAA turnover genes, expression of genes of the somatotropic axis (IGF-I, IGF-II and GHR-II) were significantly affected by time after feeding, with that of IGF-II increasing, though not significantly, two hours after feeding before rapidly returning to pre-feeding levels, or below, within a further two hours in a similar fashion to that reported by Ayson et al (2007). It has previously been reported in rainbow trout (Oncorhynchus mykiss) that Met supplementation stimulates the activity of components of these pathways (Rolland et al, 2015b), which is thought to be related to an inhibitory effect of Met limitation on the transcriptional response to growth hormone (Stubbs et al, 2002).…”

Section: Methionine Adenosyltransferase (Mat) Catalyses the Formationsupporting

confidence: 77%

Elucidation of the roles and requirements of sulphur amino acids in the diet of barramundi (Lates calcarifer)

Poppi¹

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With the increasing use of plant protein meals to replace fishmeal in aquafeeds, there is a concomitant need to properly characterise the requirements for individual amino acids in the diet of carnivorous fish species such as barramundi (Lates calcarifer). This may be especially important for methionine (Met) and taurine (Tau) which are known to be limiting in these ingredients. This project aimed to define the requirements for these nutrients for barramundi, as well as to elucidate some of the mechanisms underpinning any observed stimulatory effect on growth.The aim of the first experiment was to evaluate the methionine (Met) and total sulphur amino acid (TSAA) requirements of juvenile barramundi to act as a baseline for further study. A requirement for Met of between 10.5 (95% of maximum response) and 13.6g kg -1 (99% of maximum response) in a diet with 592g kg -1 CP and 6.6g kg -1 Cys (17.1-20.2g kg -1 TSAA; 1.8-2.3%CP Met + 1.1% CP Cys) was established. Additionally, it was concluded that at least 40% of concluded that taurine appears to be conditionally essential to barramundi.

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mRNA expression patterns for GH, PRL, SL, IGF-I and IGF-II during altered feeding status in rabbitfish, Siganus guttatus

Cited by 70 publications

References 50 publications

Modulation of fish growth hormone levels by salinity, temperature, pollutants and aquaculture related stress: a review

Modulation of fish growth hormone levels by salinity, temperature, pollutants and aquaculture related stress: a review

Differential regulation of Igf1 and Igf2 mRNA levels in tilapia hepatocytes: effects of insulin and cortisol on GH sensitivity

Elucidation of the roles and requirements of sulphur amino acids in the diet of barramundi (Lates calcarifer)

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