Cortisol rapidly reduces prolactin release and cAMP and 45Ca2+ accumulation in the cichlid fish pituitary in vitro.

Borski, Russell J.; Helms, Lisa M. H.; Richman, N.Harold; Grau, E. Gordon

doi:10.1073/pnas.88.7.2758

Cited by 91 publications

(33 citation statements)

References 37 publications

(38 reference statements)

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“…Even though extensive evidence has shown that ACTH and other stress-related compounds also affect memory retrieval (Izquierdo and Pereira 1989;Borde et al 1997Borde et al , 1998Borde and Beracochea 1999;Vianna et al 2000), several arguments suggest a causal role of glucocorticoids in the stressinduced modulation of memory retrieval. First, glucocorticoids can exert their effects either by long genomic mechanisms involving glucocorticoid and mineralocorticoid receptors (Douma et al 1998) or by more rapid (between a few seconds to several minutes) nongenomic mechanisms (Borski et al 1991;Rose et al 1993;Breuner et al 1998;De Quervain et al 1998). Second, a recent study carried out by our team showed that the increase of the delay between acute stress delivery and retention testing (2 h instead of 5 min; i.e., so far, memory retrieval took place when plasmatic corticosterone got back to basal level) totally abolished the stress-induced retrieval modulation in the CSD task (A. Celerier, C. Pierard, A.…”

Section: Discussionmentioning

confidence: 99%

Contextual and Serial Discriminations: A New Learning Paradigm to Assess Simultaneously the Effects of Acute Stress on Retrieval of Flexible or Stable Information in Mice

Célérier¹,

Piérard²,

Rachbauer³

et al. 2004

Learn. Mem.

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The present study was aimed at simultaneously determining on the same subject, the effects of stress on retrieval of flexible (contextual or temporal) or stable (spatial) information. Three behavioral paradigms carried out in a four-hole board were designed as follows: (1) Simple Discrimination (SD), in which mice learned a single discrimination; (2) Contextual and Serial Discriminations (CSD), in which mice learned two successive discriminations on two different internal contexts; (3) Spatial Serial Discriminations (SSD), in which mice learned two successive discriminations on an identical internal context. The stressor (three inescapable electric footshocks) was delivered 5 min before retention, occurring 5 min or 24 h after acquisition. Results showed that this stressor increased plasmatic corticosterone levels and fear reactivity in an elevated-plus-maze, as compared with nonstressed mice. The stressor reversed the normal pattern of retrieval observed in nonstressed controls in the CSD task, this effect being context dependent, as it was not observed in the SSD task. Overall, our study shows that stress affected the retrieval of flexible and old information, but spared the retrieval of stable or recent ones. Therefore, these behavioral paradigms allow us to study simultaneously, on the same animal, the effects of stress on distinct forms of memory retrieval.Extensive evidence indicates that stress or pharmacologically induced modifications of the emotional state can influence cognitive function (Kirschbaum et al. 1996;Lupien and McEwen 1997;Belanoff et al. 2001;Wolf et al. 2001). It has been demonstrated that the stress-induced release of glucocorticoids is one of the main factors responsible for these effects. However, glucocorticoids have differential effects depending on the memory phase or the memory system concerned in animal and human subjects (Roozendaal 2002). Glucocorticoids enhance the consolidation of new memories for emotionally arousing experiences (Kovacs et al. 1977;Buchanan and Lovallo 2001), whereas glucocorticoids impair retrieval of long-term spatial memory in rats (De Quervain et al. 1998) and free recall of verbal material in humans (De Quervain et al. 2000;Wolf et al. 2001). Interestingly, even though the modification of the affective state can act on different memory and neurobiological systems (Packard and Cahill 2001), it has been shown that working and declarative memory retrieval are particularly sensitive to glucocorticoids' administration (Lupien et al. 1999;De Quervain et al. 2003).Animal studies have focused mainly on the effects of stress on acquisition, consolidation, and long-term storage of newly acquired information (Lupien and McEwen 1997). Only a few studies have been carried out in animals to determine the effects of stress on retrieval processes (De Quervain et al. 1998;Bats et al. 2001). More specifically, De Quervain et al. (1998) have shown that stress and glucocorticoids impaired retention performance in a water-maze spatial task, as a function of the time interval...

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Section: Discussionmentioning

confidence: 99%

Contextual and Serial Discriminations: A New Learning Paradigm to Assess Simultaneously the Effects of Acute Stress on Retrieval of Flexible or Stable Information in Mice

Célérier¹,

Piérard²,

Rachbauer³

et al. 2004

Learn. Mem.

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“…This instance of Prl-cortisol antagonism, at play in the gill, operates in concert with the modulation of Prl cell function by cortisol. In the pituitary, cortisol inhibits Prl release within minutes via nongenomic mechanisms (Borski et al 1991). Recent advances in our understanding of how the teleost gill operates at the molecular level have provided the fodder for identifying novel, and conserved, hormone targets (Breves et al 2014a, Guh et al 2015.…”

Section: :3mentioning

confidence: 99%

Hormonal regulation of aquaporin 3: opposing actions of prolactin and cortisol in tilapia gill

Breves

Inokuchi

Yamaguchi

et al. 2016

Journal of Endocrinology

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Aquaporins (Aqps) are expressed within key osmoregulatory tissues where they mediate the movement of water and selected solutes across cell membranes. We leveraged the functional plasticity of Mozambique tilapia (Oreochromis mossambicus) gill epithelium to examine how Aqp3, an aquaglyceroporin, is regulated in response to osmoregulatory demands. Particular attention was paid to the actions of critical osmoregulatory hormones, namely, prolactin (Prl), growth hormone and cortisol. Branchial aqp3 mRNA levels were modulated following changes in environmental salinity, with enhanced aqp3 mRNA expression upon transfer from seawater to freshwater (FW). Accordingly, extensive Aqp3 immunoreactivity was localized to cell membranes of branchial epithelium in FW-acclimated animals. Upon transferring hypophysectomized tilapia to FW, we identified that a pituitary factor(s) is required for Aqp3 expression in FW. Replacement with ovine Prl (oPrl) was sufficient to stimulate Aqp3 expression in hypophysectomized animals held in FW, an effect blocked by coinjection with cortisol. Both oPrl and native tilapia Prls (tPrl 177 and tPrl 188 ) stimulated aqp3 in incubated gill filaments in a concentration-related manner. Consistent with in vivo responses, coincubation with cortisol blocked oPrl-stimulated aqp3 expression in vitro. Our data indicate that Prl and cortisol act directly upon branchial epithelium to regulate Aqp3 in tilapia. Thus, within the context of the diverse actions of Prl on hydromineral balance in vertebrates, we define a new role for Prl as a regulator of Aqp expression.

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“…Studies in our laboratory have shown that cortisol rapidly reduces PRL release (Ͻ20 min) through a Ca 2ϩ -dependent mechanism that involves comparably rapid reductions in 45 Ca 2ϩ accumulation (Ͻ15 min) (8). The rapid effect of cortisol is not mediated by changes in gene expression, since the protein synthesis blocker cycloheximide was unable to overcome PRL release inhibited by cortisol (10).…”

mentioning

confidence: 99%

“…In contrast with PRL, cortisol is an important seawater osmoregulatory hormone that promotes Na ϩ excretion and thereby reduces the rise in blood osmolality that occurs when animals move to hyperosmotic environments (35). Cortisol may also inhibit the secretion of PRL, whose actions counteract seawater adaptation, to promote osmoregulation in seawater (8,50).…”

mentioning

confidence: 99%

“…Microspectrofluorometry and the calciumsensitive dye fura 2 were employed to measure real-time changes in Ca i 2ϩ in isolated PRL cells. This method, unlike 45 Ca 2ϩ influx studies (8), provides measures of Ca 2ϩ that reflect mobilization from both extracellular and intracellular pools and the temporal resolution necessary for refining the rapid nature by which cortisol alters Ca 2ϩ metabolism. Investigations were also designed to examine whether cortisol blocks PRL release induced by depolarizing [K ϩ ] and the L-type Ca 2ϩ channel agonist BAY K 8644 (BAYK), which, when used in conjunction, increase the probability that Ca 2ϩ channels remain open (38).…”

mentioning

confidence: 99%

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Cortisol rapidly suppresses intracellular calcium and voltage-gated calcium channel activity in prolactin cells of the tilapia (Oreochromis mossambicus)

Hyde¹,

Seale²,

Grau³

et al. 2004

American Journal of Physiology-Endocrinology and Metabolism

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Cortisol rapidly reduces prolactin release and cAMP and 45Ca2+ accumulation in the cichlid fish pituitary in vitro.

Cited by 91 publications

References 37 publications

Contextual and Serial Discriminations: A New Learning Paradigm to Assess Simultaneously the Effects of Acute Stress on Retrieval of Flexible or Stable Information in Mice

Contextual and Serial Discriminations: A New Learning Paradigm to Assess Simultaneously the Effects of Acute Stress on Retrieval of Flexible or Stable Information in Mice

Hormonal regulation of aquaporin 3: opposing actions of prolactin and cortisol in tilapia gill

Cortisol rapidly suppresses intracellular calcium and voltage-gated calcium channel activity in prolactin cells of the tilapia (Oreochromis mossambicus)

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