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Abstract
SummaryPlatelet serotonin-binding (Bmax), using tritiated-seroionin as the ligand, was determined in 75 patients suffering from major depression with melancholia and in 26 patients diagnosed from dysthymic disorder. Twenty-five normal subjects were used as a control group. The melancholic group had significantly lower Bmaxvalues (mean: 6.7 ± 6.1 pmol/108platelets) than either dysthymic (9.3 ± 3.9 pmol/108platelets) or control (9.2 ± 4.8 pmol/108platelets) groups, while there were no significant differences between the two latter groups. There was also a significant difference on postdexamethasone Cortisol between melancholic (6.3 ± 7.1μg/dL) and dysthymic (1.4 ± 1.4μg/dL) groups, with a higher rate of nonsuppressors in melancholic groups. Although both tests were abnormal in the melancholic group, no relationship was found between platelet serotonin-binding and the dexaniethasone suppression test.
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Vincent MY, Donner NC, Smith DG, Lowry CA, Jacobson L. Dorsal raphé nucleus glucocorticoid receptors inhibit tph2 gene expression in male C57BL/6J mice. Neurosci Lett 2017; 665:48-53. [PMID: 29174640 DOI: 10.1016/j.neulet.2017.11.041] [Citation(s) in RCA: 12] [Impact Index Per Article: 1.7] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/12/2017] [Revised: 11/17/2017] [Accepted: 11/20/2017] [Indexed: 11/15/2022]
Abstract
The serotonergic dorsal raphé nucleus (DRN) expresses glucocorticoid receptors (GR), and systemic glucocorticoids have been shown to regulate expression and activity of tryptophan hydroxylase isoform 2, the rate-limiting enzyme for serotonin synthesis in brain. We have used intra-DRN injection of pseudotyped adeno-associated virus AAV2/9 transducing either green fluorescent protein (GFP control) or Cre recombinase (DRN GR deletion) in floxed GR mice to determine if DRN GR directly regulate DRN mRNA levels of tryptophan hydroxylase 2 (tph2). In a separate set of similarly-treated floxed GR mice, we also measured limbic forebrain region concentrations of serotonin (5-hydroxytryptamine; 5-HT) and its major metabolite, 5-hydroxyindoleacetic acid (5-HIAA). DRN GR deletion increased tph2 mRNA levels in the dorsal, lateral wing, and caudal parts of the DRN without altering tissue concentrations of 5-HT, 5-HIAA, or the 5-HIAA/5-HT ratio in limbic forebrain regions. We conclude that DRN GR inhibit DRN tph2 gene expression in mice without marked effects on serotonin metabolism, at least under basal conditions at the circadian nadir. These data provide the first evidence of localized control of DRN tph2 mRNA expression by DRN GR in mice.
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Affiliation(s)
- Melanie Y Vincent
- Center for Neuropharmacology and Neuroscience, Albany Medical College, Albany, NY, USA
| | - Nina C Donner
- Department of Integrative Physiology and Center for Neuroscience, University of Colorado Boulder, Boulder, CO, USA
| | - David G Smith
- Department of Integrative Physiology and Center for Neuroscience, University of Colorado Boulder, Boulder, CO, USA
| | - Christopher A Lowry
- Department of Integrative Physiology and Center for Neuroscience, University of Colorado Boulder, Boulder, CO, USA
| | - Lauren Jacobson
- Center for Neuropharmacology and Neuroscience, Albany Medical College, Albany, NY, USA.
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Habash T, Eskay R, Kuenzel W, Castonguay T. Interactions of Glucocorticoids, NPY and Hypothalamic Serotonin. Nutr Neurosci 2016; 3:183-92. [DOI: 10.1080/1028415x.2000.11747315] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/21/2022]
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Butkevich I, Mikhailenko V, Semionov P, Bagaeva T, Otellin V, Aloisi AM. Effects of maternal corticosterone and stress on behavioral and hormonal indices of formalin pain in male and female offspring of different ages. Horm Behav 2009; 55:149-57. [PMID: 18955060 DOI: 10.1016/j.yhbeh.2008.09.008] [Citation(s) in RCA: 12] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 05/08/2008] [Revised: 09/17/2008] [Accepted: 09/17/2008] [Indexed: 10/21/2022]
Abstract
In previous studies, we showed for the first time that prenatal stress in rats produces long-term alterations of formalin-induced pain behavior that are dependent on age and sex, and we demonstrated an important role of the serotonergic system in mechanisms of prenatal stress (Butkevich, I.P. and Vershinina, E.A., 2001; Butkevich, I.P. and Vershinina, E.A., 2003; Butkevich, I.P., Mikhailenko, V.A., Vershinina, E.A., Khozhai, L.I., Grigorev, I.P., Otellin, V.A., 2005; Butkevich, I.P., Mikhailenko, V.A., Khozhai, L.I., Otellin, V.A., 2006). In the present study, we focus on the influence of the maternal corticosterone milieu and its role in the effects of stress during pregnancy on formalin-induced pain and the corticosterone response to it in male and female offspring of different ages. For this purpose, we used adrenalectomy (AD) in female rats 3-4 weeks before mating (as distinct from AD typically performed at the beginning of pregnancy). Since AD is considered a reliable method to treat hypercortisolism, researches on the effects of long-term AD in dams on the systems responsible for adaptive behavior in offspring are important (such studies are not described in the literature). The results demonstrate that the differences in the corticosterone response to injection of formalin and saline are obvious in 90-day-old (adult) female offspring but masked in 25-day-old ones. AD promoted the corticosterone response to formalin-induced pain but not to injection of saline in prenatally non-stressed female offspring of both ages. Prenatal stress canceled the differences in corticosterone response to injection of formalin and saline in 25-day-old offspring of AD dams and in adult offspring of sham-operated (SH) dams but caused similar differences in adult offspring of AD dams. Sex differences were found in basal corticosterone levels in AD prenatally stressed rats of both age groups, with a higher level in females, and in the corticosterone response to formalin-induced pain in the adult rats of all groups investigated, with higher corticosterone levels in females. In regard to pain behavior, AD induced significant changes in flexing+shaking in prenatally non-stressed adult offspring and canceled the differences in this behavior between non-stressed and stressed 25-day-old offspring. There were sex differences in pain behavior of the adult rats: greater flexing+shaking in AD non-stressed males but in SH non-stressed females; greater licking in prenatally-stressed AD and SH females. These results indicate that the long-term influences of maternal corticosterone on formalin-induced pain and the corticosterone response to it are determined by the sex and age of the offspring and suggest that other mechanisms, including serotonergic ones revealed in our previous studies, are involved in the effects of prenatal stress on inflammatory pain behavior.
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Affiliation(s)
- Irina Butkevich
- Laboratory of Ontogeny of the Nervous System, IP Pavlov Institute of Physiology, Russian Academy of Sciences, Petersburg, Russia.
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Haller J, Horváth Z, Bakos N. The effect of buspirone on normal and hypoarousal-driven abnormal aggression in rats. Prog Neuropsychopharmacol Biol Psychiatry 2007; 31:27-31. [PMID: 16893596 DOI: 10.1016/j.pnpbp.2006.05.022] [Citation(s) in RCA: 17] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 03/24/2006] [Revised: 05/10/2006] [Accepted: 05/10/2006] [Indexed: 11/29/2022]
Abstract
Aggressiveness is associated with decreased glucocorticoid production, autonomic hypoarousal, and social deficits in antisocial personality disorder and its childhood antecedent conduct disorder. We showed previously that experimentally induced chronic glucocorticoid deficiency leads to abnormal forms of attack, autonomic hypoarousal, and social deficits in rats. We also showed that serotonergic neurotransmission, which downregulates aggressiveness in normal rats appears to lose its aggression-controlling role in glucocorticoid-deficient rats. We suggested that abnormal aggression develops in such rats as a consequence of serotonergic disturbances that result from chronic glucocorticoid deficiency. Here we assessed the effects of the serotonergic anxiolytic buspirone on aggressive behavior in normal and glucocorticoid-deficient rats. Noteworthy, this compound is frequently used in the clinic to control moderate aggression problems. As expected, buspirone dose-dependently reduced the duration of agonistic behaviors in normal rats exposed to resident/intruder conflicts. Similar to earlier experiments, glucocorticoid deficiency dramatically increased the share of attacks directed towards vulnerable body parts of the opponents (head, throat and belly). Surprisingly, 1 and 5 mg/kg buspirone dramatically increased the frequency of biting attacks in glucocorticoid-deficient rats. The share of vulnerable attacks remained as high as in vehicle-treated glucocorticoid-deficient rats. These data show that chronic glucocorticoid deficiency disturbs serotonergic neurotransmission, which reverses the aggression-related effects of the serotonergic agent buspirone. This finding is in line with disparate human findings on the effects of serotonergic agents on aggression in antisocial personality disordered people.
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Affiliation(s)
- Jozsef Haller
- Institute of Experimental Medicine, Budapest, Hungary.
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Haller J, Kruk MR. Normal and abnormal aggression: human disorders and novel laboratory models. Neurosci Biobehav Rev 2006; 30:292-303. [PMID: 16483889 DOI: 10.1016/j.neubiorev.2005.01.005] [Citation(s) in RCA: 122] [Impact Index Per Article: 6.8] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/01/2004] [Revised: 01/20/2005] [Accepted: 01/27/2005] [Indexed: 10/25/2022]
Abstract
We review here aggression-related human psychopathologies and propose that human aggressiveness is mainly due to three major factors: (i) brain dysfunction affecting aggression-controlling brain centers (e.g. in certain types of brain lesions, epilepsy, Alzheimer disease, etc.); (ii) hypoarousal associated with chronically low plasma glucocorticoids, which foster violence by diminishing emotional barriers that limit such behaviors (e.g. in conduct disorder and antisocial personality disorder); (iii) hyperarousal which leads to irritability and outbursts (e.g. in depression, intermittent explosive disorder, chronic fatigue, etc.). Different disorders are associated with different types of aggressiveness; e.g. hypoarousal is often associated with instrumental aggression, whereas hyperarousal is associated with uncontrollable outbursts. Many psychological disorders have been simulated in laboratory models, which were used to assess aggressiveness. Little effort was invested, however, in assessing the abnormal dimension of such aggressiveness. We present here three models that appear especially suitable to assess abnormal aspects of rodent aggression: (i) abnormal attack targeting (head, throat, and belly) that is induced by hypoarousal in rats and models violence in hypoarousal-driven human aggression (ii) 'escalated' aggression (increased aggressive response due to frustration or instigation), which models irritability and hyperarousal-driven aggressiveness; and (iii) context-independent attacks induced by hypothalamic stimulation or genetic manipulations. These three models address different aspects of abnormal aggressiveness, and can become extremely useful in three areas: in evaluating and assessing models of human psychopathologies, in studying transgenic animals, and in developing new treatment strategies. Research based on these or similar models do not address aggressiveness in quantitative terms, but follows the development of abnormal aspects, and the possibilities of their specific treatment.
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Affiliation(s)
- József Haller
- Institute of Experimental Medicine, P.O. Box 67, 1450 Budapest, Hungary.
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Haller J, Mikics E, Halász J, Tóth M. Mechanisms differentiating normal from abnormal aggression: glucocorticoids and serotonin. Eur J Pharmacol 2005; 526:89-100. [PMID: 16280125 DOI: 10.1016/j.ejphar.2005.09.064] [Citation(s) in RCA: 63] [Impact Index Per Article: 3.3] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/31/2005] [Revised: 06/28/2005] [Accepted: 09/23/2005] [Indexed: 11/15/2022]
Abstract
Psychopathology-associated human aggression types are induced by a variety of conditions, are behaviorally variable, and show a differential pharmacological responsiveness. Thus, there are several types of abnormal human aggression. This diversity was not reflected by conventional laboratory approaches that focused on the quantitative aspects of aggressive behavior. Recently, several laboratory models of abnormal aggression were proposed, which mainly model hyperarousal-driven aggressiveness (characteristic to intermittent explosive disorder, post-traumatic stress disorder, depression, chronic burnout, etc.) and hypoarousal-driven aggressiveness (characteristic mainly to antisocial personality disorder and its childhood antecedent conduct disorder). Findings obtained with these models suggest that hyperarousal-driven aggressiveness has at its roots an excessive acute glucocorticoid stress response (and probably an exaggerated response of other stress-related systems), whereas chronic hypoarousal-associated aggressiveness is due to glucocorticoid deficits that affect brain function on the long term. In hypoarousal-driven aggressiveness, serotonergic neurotransmission appears to lose its impact on aggression (which it has in normal aggression), certain prefrontal neurons are weakly activated, whereas the central amygdala (no, or weakly involved in the control of normal aggression) acquires important roles. We suggest that the specific study of abnormal aspects of aggressive behavior would lead to important developments in understanding the specific mechanisms underlying different forms of aggression, and may ultimately lead to the development of better treatment approaches.
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Affiliation(s)
- Jozsef Haller
- Institute of Experimental Medicine, Hungarian Academy of Science, 1450 Budapest, P.O. Box 67, Hungary.
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8
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Abstract
Serotonin (5-HT) has been implicated in the control of eating behavior and body weight. Stimulants of this monoamine reduce food intake and weight gain and increase energy expenditure, both in animals and in humans. This article reviews evidence that supports a role for hypothalamic serotonergic receptor mechanisms in the mediation of these effects. A variety of studies in rodents indicate that, at low doses, 5-HT or drugs that enhance the release of this neurotransmitter preferentially inhibit the ingestion of carbohydrate, more than fat or protein. This phenomenon is mediated, in part, by 5-HT receptors located in various medial hypothalamic nuclei. A negative feedback loop exists between the consumption of this macronutrient and the turnover of 5-HT in the hypothalamus. That is, carbohydrate ingestion enhances the synthesis and release of hypothalamic 5-HT, which in turn serves to control the size of carbohydrate-rich meals. A model is described that proposes the involvement of circulating hormones and glucose in this feedback process. These hormones, including insulin, corticosterone, and the adipose tissue-derived hormone, leptin, have impact on serotonergic function as well as satiety. This model further suggests that 5-HT exerts its strongest effect on appetite at the start of the natural feeding cycle, when carbohydrate is normally preferred. Clinical studies provide evidence that is consistent with the proposed model and that implicates 5-HT in disturbances of eating and body weight disorders.
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9
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Routh VH, Stern JS, Horwitz BA. Adrenalectomy increases serotonin turnover in brains of obese Zucker rats. Physiol Behav 1995; 58:491-9. [PMID: 8587957 DOI: 10.1016/0031-9384(95)00079-x] [Citation(s) in RCA: 7] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/31/2023]
Abstract
Because adrenalectomy tends to normalize many metabolic abnormalities of obese Zucker rats, we hypothesized that it would also normalize the depressed serotonergic turnover in their ventromedial nucleus (VMN). Lean (Fa/Fa) and obese (fa/fa) male Zucker rats were adrenalectomized or sham operated when 5 wks old and sacrificed at 11 wks. Their brains were frozen, and 13 areas were dissected for HPLC-EC analysis of monoamines and metabolites. Consistent with previous studies, VMN serotonin turnover (indexed by 5-HIAA/5-HT) was lower in obese than lean sham-operated rats. Monoamine and metabolite concentrations were altered in several other brain areas as well. Adrenalectomy reduced percent body fat and elevated VMN serotonergic turnover more in obese than in lean rats. It also stimulated serotonergic turnover in almost every brain area examined. We conclude that in obese Zucker rats: monoaminergic activity is altered in several brain areas involved in regulating energy balance; adrenalectomy normalizes the reduced VMN serotonergic turnover seen in the obese rats; and adrenalectomy results in a generalized increase in central serotonergic turnover. These data are consistent with serotonin's role in inhibiting food intake and enhancing sympathetic stimulation of energy metabolism.
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Affiliation(s)
- V H Routh
- Department of Nutrition, University of California at Davis 95616, USA
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Amoroso D, Kindel G, Wülfert E, Hanin I. Long-term exposure to high levels of corticosterone aggravates AF64A-induced cholinergic hypofunction in rat hippocampus in vivo. Brain Res 1994; 661:9-18. [PMID: 7530584 DOI: 10.1016/0006-8993(94)91174-6] [Citation(s) in RCA: 11] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/25/2023]
Abstract
Male Sprague-Dawley rats were bilaterally adrenalectomized and corticosterone (CORT) was substituted as subcutaneous pellets in two groups of animals: low- (L-CORT: 1 x 25 mg pellet) or high-level of CORT (H-CORT: 4 x 100 mg pellet). Between 14 and 19 days after CORT substitution, ethylcholine aziridinium (AF64A) was intracerebroventricularly (i.c.v.) injected in the CORT long-term exposed rats and the dose- and time-dependent effect of this treatment was measured on choline acetyltransferase (ChAT) and acetylcholinesterase (AChE) activities in hippocampus and septum and on serotonin (5-HT), 5-hydroxyindoleacetic acid (5-HIAA) and noradrenaline (NA) levels in hippocampus. Rats were killed at 2, 4, 7 and 14 days after AF64A treatment. Starting 4 days after the i.c.v. administration of 0.5 or 1.0 nmol of AF64A, an aggravation of the reduction of ChAT activity was measured in the hippocampus of the H-CORT animals compared to the L-CORT ones. In the septum of the H-CORT rats, the activity of ChAT increased within the first week after the infusion of the toxin, while no significant effect was observed in the L-CORT group. As we observed with ChAT, AF64A induced a severe inhibition of AChE activity in the hippocampus of the H-CORT rats compared to the L-CORT ones. In the septum, an increase of AChE activity was observed in both groups of CORT-exposed animals. In the hippocampus of H-CORT animals, the exacerbation of the inhibition of ChAT and AChE activity was accompanied by a parallel decrease in the content of 5-HT and 5-HIAA starting 4 days after AF64A injections. Finally, NA content in hippocampus was not affected by the toxin in the CORT-substituted animals. These data demonstrate that: (1) long-term exposure to supraphysiological levels of CORT enhances the cholinodisruption induced in hippocampus by AF64A, at doses of 0.5 and 1.0 nmol/side; (2) high circulating plasma CORT concentrations impair hippocampal cholinergic neuronal capacity to recover from damage; and (3) the degree of inhibition of the serotoninergic system is augmented in H-CORT animals, most probably due to an adaptation of the serotoninergic neurons to the larger withdrawal of cholinergic function observed in this group.
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Affiliation(s)
- D Amoroso
- Department of Pharmacology and Experimental Therapeutics, Loyola University Chicago, Stritch School of Medicine, Maywood, IL 60153
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Jhanwar-Uniyal M, Moorjani B, Kahn AH. Indications of pre- and post-synaptic 5-HT1A receptor interactions in feeding behavior and neuroendocrine regulation. Brain Res 1994; 646:247-57. [PMID: 8069671 DOI: 10.1016/0006-8993(94)90086-8] [Citation(s) in RCA: 17] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/28/2023]
Abstract
This bipartite study uses behavioral and biochemical means to explore the involvement of both pre- and post-synaptic 5-HT1A receptors in the control of food intake and neuroendocrine regulation. In the pharmacological study, the administration of the 5-HT1A receptor agonist 8-hydroxy-2-(di-n-propylamino) tetralin (8-OH-DPAT; 60 micrograms/kg b.wt., i.p.) to rats caused a significant increase in 2 h intake of a high carbohydrate (CARB)/sugar diet (P < 0.05) during the relatively inactive feeding period of the late light cycle. No significant change was detected in the intake of Purina laboratory chow at 2 h, or of the intake of either diet at 4 h and 24 h after 8-OH-DPAT administration. Injection of 8-OH-DPAT induced a drop in insulin levels in rats maintained on high CARB/sugar diets only (-90%; P < 0.05). It also caused an increase in circulating glucose levels in both high CARB/sugar (240%; P < 0.01) and chow fed (123%; P < 0.05) rats; it did so more intensely in high CARB/sugar-fed rats. In the biochemical study, radioligand binding techniques were used to assess 5-HT1A receptor density in the hypothalamus, as well as the relationship between 5-HT1A receptors and circulating levels of insulin and glucose. Chronic and acute administration (25 mg/kg b.wt./5 injections, and 50 mg/kg b.wt., respectively, i.p.) of the potent hypoglycemic agent tolbutamide (TOL) caused a significant increase in 5-HT1A receptor density (+243% and +132.6%, respectively; P < 0.05) in the medial hypothalamus but not in the lateral hypothalamus, as compared to vehicle-treated rats. Chronic glucose replacement therapy showed a trend towards reversing the depressed circulating glucose levels as well as the medial hypothalamic 5-HT1A receptor density to control levels. These studies indicate that the pre-synaptic mechanism of 8-OH-DPAT-induced hyperphagia may require specific circulating levels of insulin and glucose, which are regulated via post-synaptic 5-HT1A receptors.
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Affiliation(s)
- M Jhanwar-Uniyal
- Laboratory of Neuroendocrinology, Rockefeller University, New York, NY 10021
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Hu SB, Lightman SL, Tannahill LA. 5-Hydroxytryptamine stimulates corticosteroid-sensitive CRF release from cultured foetal hypothalamic cells. Role of protein kinases. Brain Res 1992; 574:266-70. [PMID: 1638400 DOI: 10.1016/0006-8993(92)90826-u] [Citation(s) in RCA: 6] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/28/2022]
Abstract
5-Hydroxytryptamine (5-HT) has been shown to activate the hypothalamo-pituitary-adrenal axis, possibly by a direct action on hypothalamic CRF synthesis and release. In order to study the mechanisms involved in this effect, foetal hypothalamic cells were cultured and corticotropin-releasing factor-41 (CRF) release was measured by radioimmunoassay. 5-HT induced CRF release in a dose-dependent manner. Further studies were performed with a specific protein kinase C inhibitor, H-7 (1-(5-isoquinolinesulfonyl)-2-methyl-piperazine) and a specific cyclic adenosine monophosphate-dependent protein kinase inhibitor, IP-20. Basal release of CRF-41 from the cultured hypothalamic cells was unaffected by IP-20 and was only diminished at a high (50 microM) concentration of H-7. 5-HT stimulated-CRF release, however, was blocked by both H-7 and IP-20. Dexamethasone and aldosterone both caused a dose-dependent inhibition of 5-HT induced CRF release. These results demonstrate that CRF can be released from hypothalamic neurons in response to 5-HT through a protein kinase C and protein kinase A dependent mechanism and that 5-HT stimulated CRF release can be inhibited by dexamethasone and aldosterone.
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Affiliation(s)
- S B Hu
- Neuroendocrinology Unit, Charing Cross and Westminster Medical School, Charing Cross Hospital, London, U.K
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Affiliation(s)
- A Biegon
- Department of Neurobiology, Weizmann Institute of Science, Rehovot, Israel
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14
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Affiliation(s)
- V N Luine
- Laboratory of Neuroendocrinology, Rockefeller University, New York, NY 10021
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