Overcompensation of circulating and local insulin-like growth factor-1 during catch-up growth in hybrid striped bass ( Morone chrysops × Morone saxatilis ) following temperature and feeding manipulations

Picha, Matthew E.; Biga, Peggy R.; Galt, Nicholas J.; McGinty, Andy S.; Gross, Kevin; Hedgpeth, Vickie; Siopes, T. D.; Borski, Russell J.

doi:10.1016/j.aquaculture.2014.02.028

Cited by 24 publications

(24 citation statements)

References 60 publications

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“…On the other hand, muscle igf-1 was less sensitive to fasting but showed a moderate, positive correlation with growth rate. This is consistent with the finding in a hybrid striped bass (Morone chrysops x M. saxatilis) where muscle igf-1 was positively correlated with growth rate (r 2 = 0.23) (Picha et al, 2014). However, it should be noted that the same authors reported that liver igf-1 also correlated with growth rate (r 2 = 0.48) in the hybrid striped bass (Picha et al, 2008b).…”

Section: Discussionsupporting

confidence: 90%

Effects of seawater transfer and fasting on the endocrine and biochemical growth indices in juvenile chum salmon (Oncorhynchus keta)

Taniyama

Kaneko

Inatani

et al. 2016

General and Comparative Endocrinology

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Insulin-like growth factor (IGF)-I, IGF-binding protein (IGFBP)-1 and RNA/DNA ratio are endocrine and biochemical parameters used as growth indices in fish, however, they are subjected to environmental modulation. Chum salmon (Oncorhynchus keta) migrate from freshwater (FW) to seawater (SW) at fry/juvenile stage weighing around 1g and suffer growth-dependent mortality during the early phase of their marine life. In order to reveal environmental modulation of the IGF/IGFBP system and establish a reliable growth index for juvenile chum salmon, we examined effects of SW transfer and fasting on IGF-I, IGFBP-1 and RNA/DNA ratio, and correlated them to individual growth rate. Among serum IGF-I, liver and muscle igf-1, igfbp-1a, igfbp-1b and RNA/DNA ratio examined, muscle RNA/DNA ratio and muscle igfbp-1a responded to SW transfer. Serum IGF-I, liver igf-1 and liver RNA/DNA ratio were sensitive to nutritional change by being reduced in 1week in both FW and SW while muscle igf-1 was reduced 2weeks after fasting. In contrast, igfbp-1a in both tissues was increased by 2weeks of fasting and igfbp-1b in the liver of SW fish was increased in 1week. These results suggest that the sensitivity of igf-1 and igfbp-1s to fasting differs between tissues and subtypes, respectively. When chum salmon juveniles in SW were marked and subjected to feeding or fasting, serum IGF-I showed the highest correlation with individual growth rate. Liver igfbp-1a and -1b, and muscle igf-1 exhibited moderate correlation coefficients with growth rate. These results show that serum IGF-I is superior to the other parameters as a growth index in juvenile chum salmon in term of its stability to salinity change, high sensitivity to fasting and strong relationship with growth rate. On the one hand, when collecting blood from chum salmon fry/juveniles is not practical, measuring liver igfbp-1a and -1b, or/and muscle igf-1 is an alternative.

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Section: Discussionsupporting

confidence: 90%

Effects of seawater transfer and fasting on the endocrine and biochemical growth indices in juvenile chum salmon (Oncorhynchus keta)

Taniyama

Kaneko

Inatani

et al. 2016

General and Comparative Endocrinology

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“…The strong association between IGF1 and growth in bony fish has led to the application of IGF1 mRNA as a molecular marker of growth under a variety of environmental manipulations (Vera Cruz et al 2006;Montserrat et al 2007;Vera Cruz and Brown, 2009;Reinecke 2010;Picha et al 2014). However, it has been demonstrated that nuclear receptors also modulate the expression of IGF1 following activation by steroid hormones (Riley et al 2004;Johns et al, 2011;Norbeck and Sheridan 2011;Cleveland and Weber 2015).…”

Section: Biological Response Of Larvae To An Episodic Exposurementioning

confidence: 99%

Compensatory response of fathead minnow larvae following a pulsed in-situ exposure to a seasonal agricultural runoff event

Ali

Sangster

Snow

et al. 2017

Science of The Total Environment

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Bartelt-Hunt, Shannon L.; and Kolok, Alan S., "Compensatory response of fathead minnow larvae following a pulsed in-situ exposure to a seasonal agricultural runoff event" (2017 H I G H L I G H T S• Fathead minnow larvae were maintained at the Elkhorn River Research Station for an in-situ exposure to a seasonally-occurring runoff.• There was a 1.5-to 13-fold change in waterborne agrichemical contaminants including atrazine, acetochlor and metolachlor.• Peaks in sediment contamination by agrichemicals was discordant with those of waterborne contaminants.• Minnow larvae demonstrated compensation following reduction in size and androgenic gene expression by agrichemical exposure. Agriculturally-dominated waterways such as those found throughout the Midwestern United States often experience seasonal pulses of agrichemical contaminants which pose a potential hazard to aquatic organisms at varying life stages. The objective of this study was to characterize the developmental plasticity of fathead minnow larvae in a natural environment subject to a seasonal episodic perturbation in the form of a complex mixture of agricultural stressors. Fathead minnow larvae were maintained at the Elkhorn River Research Station for a 28-d in situ exposure to an agrichemical pulse event. Minnow larvae were sampled after 14 and 28 days to characterize developmental plasticity through growth measures and relative gene expression. Concentrations of agrichemical contaminants measured in water using polar organic chemical integrative samplers and composite sediment samples throughout the 28-d exposure were quantified using gas chromatography-mass spectrometry. Elevated concentrations of acetochlor, atrazine, and metolachlor were indicative of inputs from agricultural sources and were associated with reductions in body mass, condition factor, and androgenic gene expression in river exposed fathead minnow larvae. However, following a 14-d in situ depuration during the post-pulse period, river exposed larvae overcompensated in previously suppressed biological endpoints. These results indicate that fathead minnow larvae are capable of compensatory responses following episodic exposure to agrichemical stressors. G R A P H I C A L A B S T R A C T a b s t r a c t a r t i c l e i n f o

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“…In these animals leptin is elevated during feeding as a possible means to stimulate the growth axis when nutrient availability is high (Jorgensen et al, 2013; Won et al, 2012), similar to that which may occur for mammals. We postulate that stimulation of hepatic GHR/IGF by leptin in the tilapia and perhaps other fishes where leptin increases during fasting may serve as a mechanism to limit abrupt catabolic declines in the expression of GHRs or IGFs that have been reported previously (Fox et al, 2006; Picha et al, 2014). Furthermore, LepA stimulation of IGFs may serve to promote peripheral glucose uptake in accordance with IGFs established insulin-like actions and LepA glucose mobilizing effects (Baltzegar et al, 2014; Froesch et al, 1985).…”

Section: Discussionmentioning

confidence: 72%

“…The elevations in GH seen with fasting in tilapia and other fish (Fox et al, 2006; Picha et al, 2014), combined with potential increases in LepA resulting from higher levels of GH and LepA actions in promoting ghr and igf expression itself, might provide a mechanism for sparing declines in GHR and IGFs during states of GH resistance (Fig. 7).…”

Section: Discussionmentioning

confidence: 99%

Control of leptin by metabolic state and its regulatory interactions with pituitary growth hormone and hepatic growth hormone receptors and insulin like growth factors in the tilapia ( Oreochromis mossambicus )

Douros

Baltzegar

Mankiewicz

et al. 2017

General and Comparative Endocrinology

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Leptin is an important cytokine for regulating energy homeostasis, however, relatively little is known about its function and control in teleost fishes or other ectotherms, particularly with regard to interactions with the growth hormone (GH)/insulin-like growth factors (IGFs) growth regulatory axis. Here we assessed the regulation of LepA, the dominant paralog in tilapia (Oreochromis mossambicus) and other teleosts under altered nutritional state, and evaluated how LepA might alter pituitary growth hormone (GH) and hepatic insulin-like growth factors (IGFs) that are known to be disparately regulated by metabolic state. Circulating LepA, and lepa and lepr gene expression increased after 3-weeks fasting and declined to control levels 10 days following refeeding. This pattern of leptin regulation by metabolic state is similar to that previously observed for pituitary GH and opposite that of hepatic GHR and/or IGF dynamics in tilapia and other fishes. We therefore evaluated if LepA might differentially regulate pituitary GH, and hepatic GH receptors (GHRs) and IGFs. Recombinant tilapia LepA (rtLepA) increased hepatic gene expression of igf-1, igf-2, ghr-1, and ghr-2 from isolated hepatocytes following 24 h incubation. Intraperitoneal rtLepA injection, on the other hand, stimulated hepatic igf-1, but had little effect on hepatic igf-2, ghr1, or ghr2 mRNA abundance. LepA suppressed GH accumulation and gh mRNA in pituitaries in vitro, but had no effect on GH release. We next sought to test if abolition of pituitary GH via hypophysectomy (Hx) affects the expression of hepatic lepa and lepr. Hypophysectomy significantly increases hepatic lepa mRNA abundance, while GH replacement in Hx fish restores lepa mRNA levels to that of sham controls. Leptin receptor (lepr) mRNA was unchanged by Hx. In in vitro hepatocyte incubations, GH inhibits lepa and lepr mRNA expression at low concentrations, while higher concentration stimulates lepa expression. Taken together, these findings indicate LepA gene expression and secretion increases with fasting, consistent with the hormones function in promoting energy expenditure during catabolic stress. It would also appear that LepA might play an important role in stimulating GHR and IGFs to potentially spare declines in these factors during catabolism. Evidence also suggests for the first time in teleosts that GH may exert important regulatory effects on hepatic LepA production, insofar as physiological levels(0.05–1 nM) suppresse lepa mRNA accumulation. Leptin A, may in turn exert negative feedback effects on basal GH mRNA abundance, but not secretion.

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Overcompensation of circulating and local insulin-like growth factor-1 during catch-up growth in hybrid striped bass ( Morone chrysops × Morone saxatilis ) following temperature and feeding manipulations

Cited by 24 publications

References 60 publications

Effects of seawater transfer and fasting on the endocrine and biochemical growth indices in juvenile chum salmon (Oncorhynchus keta)

Effects of seawater transfer and fasting on the endocrine and biochemical growth indices in juvenile chum salmon (Oncorhynchus keta)

Compensatory response of fathead minnow larvae following a pulsed in-situ exposure to a seasonal agricultural runoff event

Control of leptin by metabolic state and its regulatory interactions with pituitary growth hormone and hepatic growth hormone receptors and insulin like growth factors in the tilapia ( Oreochromis mossambicus )

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