Seawater and freshwater challenges affect the insulin-like growth factors IGF-I and IGF-II in liver and osmoregulatory organs of the tilapia

Link, Karl; Berishvili, Giorgi; Shved, Natallia; D'Cotta, Hélèna; Baroiller, Jean‐François; Reinecke, Manfred; Eppler, Elisabeth

doi:10.1016/j.mce.2010.05.011

Cited by 30 publications

(29 citation statements)

References 59 publications

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“…Our results confirmed the hyperosmotic role of PRL in S. aurata, in agreement with the reported for this hormone in the same species and in other teleost species (Manzon 2002;Sakamoto and McCormick 2006;Laiz-Carrión et al 2009;Vargas-Chacoff et al 2009b;Fuentes et al 2010;Link et al 2010). PRL cells increased in volume, occupying larger hypophyseal area, and showed bigger nuclear sizes and/or cytoplasmic features upon low osmolality challenge in both S. aurata and S. sarba, indicating an osmosensing capability of sea bream PRL cells (Mancera et al 1993b;Kwong et al 2009).…”

Section: Prlsupporting

confidence: 91%

“…IGF-I is generally considered as a key player for mitochondria-rich cell (MRC) development as well as Na + , K + -ATPase increased activity (Sakamoto et al 1993;McCormick 1995;Reinecke et al 2005;Link et al 2010). Therefore, its observed increase in the highest and lowest salinities could aid the proliferation and differentiation of MRC cells as well as the enhancement in Na + , K + -ATPase activity related to the acclimation of S. aurata specimens to extreme salinities (5 and 55 ‰), where higher number and sizes of MRCs as well as gill Na + , K + -ATPase activity have been observed (Laiz-Carrión et al 2005a).…”

Section: Gh/igf-i Axismentioning

confidence: 99%

“…For example, in salmonids, parr-smolt transformation is associated with IGF-I mRNA increase (McCormick 2001;Reinecke et al 2005;Jørgensen et al 2007). Also, the transference of the black-chinned tilapia O. melanotheron heudelotii to seawater then to freshwater resulted in a transient IGF-I mRNA down-regulation (Link et al 2010). Ultimately, in the Southern flounder Paralichthys lethostigma, transfer from freshwater to seawater increased hepatic IGF-I expression (Tipsmark et al 2008).…”

Section: Gh/igf-i Axismentioning

confidence: 99%

“…For this reason, more research on both euryhaline and stenohaline fish species to determine the widespread osmoregulatory actions of the GH/IGF-I axis is required (Sakamoto and McCormick 2006;Mancera and McCormick 2007;Link et al 2010).…”

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confidence: 99%

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Acclimation to different environmental salinities induces molecular endocrine changes in the GH/IGF-I axis of juvenile gilthead sea bream (Sparus aurata L.)

2014

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To assess the role of the GH/IGF-I axis in osmotic acclimation of the gilthead seabream Sparus aurata, juvenile specimens were acclimated to four environmental salinities: hyposmotic (5 ‰), isosmotic (12 ‰) and hyperosmotic (40 and 55 ‰). The full-length cDNAs for both pituitary adenylate cyclase-activating peptide (PACAP) and prepro-somatostatin-I (PSS-I), the precursor for mature somatostatin-I (SS-I), were cloned. Hypothalamic PACAP and PSS-I, hypophyseal growth hormone (GH) and prolactin (PRL), and hepatic insulin-like growth factor-I (IGF-I) mRNA expression levels were analyzed in the four rearing salinities tested. PACAP and IGF-I mRNA values increased significantly in response to both 5 and 55 ‰ salinities, showing a U-shaped curve relationship with the basal level in the 40 ‰ group. Hypothalamic PSS-I expression increased strongly in the 55 ‰ environment. GH mRNA levels did not change in any of the tested environmental salinities. PRL mRNA maximum levels were encountered in the 5 and 12 ‰ environments, but significantly down-regulated in the 40 ‰. Plasma cortisol levels significantly increased in the 40 ‰ environment. These results are discussed in relation to the well-known high adaptability of Sparus aurata to different environmental salinities and the role of the GH/IGF-I axis in this process.

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Section: Prlsupporting

confidence: 91%

Section: Gh/igf-i Axismentioning

confidence: 99%

Section: Gh/igf-i Axismentioning

confidence: 99%

mentioning

confidence: 99%

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Acclimation to different environmental salinities induces molecular endocrine changes in the GH/IGF-I axis of juvenile gilthead sea bream (Sparus aurata L.)

2014

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“…one month (Havird et al 2013; for specific studies regarding the genes considered in this study see, e.g. Riley et al 2003, Magdeldin et al 2007, Link et al 2010, but see Côté et al 2007). This observation also holds true for studies searching for a better understanding of the mechanisms promoting euryhalinity (e.g.…”

Section: Discussionmentioning

confidence: 99%

Fitness difference between cryptic salinity-related phenotypes of sea bass (<em>Dicentrarchus labrax</em>)

et al. 2014

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Summary:The existence of cryptic salinity-related phenotypes has been hypothesized in the "euryhaline" sea bass (Dicentrarchus labrax). How differential osmoregulation costs between freshwater and saltwater environments affect fitness and phenotypic variation is misunderstood in this species. During an experiment lasting around five months, we investigated changes in the whole body mass and in the expression of growth-related genes (insulin-like growth factor 1 [IGF-1]; growth hormone receptor [GHR]) in the intestine and the liver of sea bass thriving in sea water (SSW), successfully acclimated to freshwater (SFW), and unsuccessfully acclimated to freshwater (UFW). Albeit non-significant, a trend toward change in body mass was demonstrated among SSW, UFW and SFW fish, suggesting that SSW fish were a mixture of the other phenotypes. Several mortality peaks were observed during the experiment, with batches of UFW fish showing higher expression in the osmoregulatory intestine due to down-regulation of genes in the liver and significant up-regulation of GHR in the intestine compared with SFW fish. Energy investment toward growth or ion homeostasis hence partly mediates the fitness difference between cryptic SFW and UFW phenotypes. The use of a genetic marker located within the IGF-1 gene showed no genotype-phenotype relationship with levels of gene expression.Keywords: phenotype; gene expression; growth hormone receptor; insulin-like growth factor 1; sea bass. Diferencia de eficacia biológica entre fenotipos crípticos relacionados con salinidad en la lubina (Dicentrarchus labrax)Resumen: En la especie "eurihalina" de la lubina (Dicentrarchus labrax) se ha planteado la existencia de fenotipos crípticos relacionados con la salinidad. En esta especie los costes diferenciales de osmoregulación a la adaptación en de agua dulce y salada son aún desconocidos. Durante un experimento de aproximadamente 5 meses, se investigó los cambios en la masa corporal y en la expresión de genes relacionados con el crecimiento (factor de crecimiento similar a la insulina 1 [IGF-1]; receptor de la hormona del crecimiento [GHR]) en el intestino y el hígado de lubina en individuos que prosperan en agua de mar (SSW), individuos aclimatados con éxito con el agua dulce (SFW), e individuos no aclimatados al agua dulce (UFW). Aunque no es significativa, se observa una tendencia de cambio en la masa corporal entre individuos SSW, UFW y SFW. Estos resultados sugieren que los individuos SSW son una mezcla de los otros fenotipos. Se observaron varios picos de mortalidad durante el experimento, con lotes de peces UFW que presentan una expresión génica más elevada en el intestino osmoregulador, debido a la regulación a la baja de genes en el hígado y regulación hacia arriba en la GHR del intestino cunado se compara con los peces SFW. Por lo tanto, la inversión de energía hacia el crecimiento o la homeostasis iónica explica en parte la diferencia de adaptación entre los crípticos fenotipos SFW y UFW. El uso de un marcador genético localizado dentro del ...

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Adaptation to Salinity

Ahmadi

Baroiller

Carreras

et al. 2015

Climate Change and Agriculture Worldwide

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Seawater and freshwater challenges affect the insulin-like growth factors IGF-I and IGF-II in liver and osmoregulatory organs of the tilapia

Cited by 30 publications

References 59 publications

Acclimation to different environmental salinities induces molecular endocrine changes in the GH/IGF-I axis of juvenile gilthead sea bream (Sparus aurata L.)

Acclimation to different environmental salinities induces molecular endocrine changes in the GH/IGF-I axis of juvenile gilthead sea bream (Sparus aurata L.)

Fitness difference between cryptic salinity-related phenotypes of sea bass (<em>Dicentrarchus labrax</em>)

Adaptation to Salinity

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