Regulation of Serotonin1A, Glucocorticoid, and Mineralocorticoid Receptor in Rat and Human Hippocampus: Implications for the Neurobiology of Depression

López, Juan F.; Chalmers, Derek T.; Little, Karley Y.; Watson, Stanley J.

doi:10.1016/s0006-3223(97)00484-8

Cited by 616 publications

(421 citation statements)

References 68 publications

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“…In the present study, ACTH as well corticosterone levels were significantly increased after 2 weeks of daily fluoxetine treatment, and they were back to baseline levels after 8 weeks. This result is in contrast to other reports of decreased or baseline levels of ACTH and corticosterone plasma levels after repeated treatment of rats with fluoxetine (Brady et al, 1991(Brady et al, , 1992Lopez et al, 1998;Raap et al, 1999). One reason for these discrepancies might be the large variability in daily fluoxetine doses used in the different studies.…”

Section: Discussioncontrasting

confidence: 99%

Hyperforin-Containing Extracts of St John's Wort Fail to Alter Gene Transcription in Brain Areas Involved in HPA Axis Control in a Long-Term Treatment Regimen in Rats

Butterweck

Winterhoff²,

Herkenham

2003

Neuropsychopharmacol

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We previously showed that a methanolic extract of St John's wort (SJW) (Hypericum) and hypericin, one of its active constituents, both have delayed regulation of genes that are involved in the control of the hypothalamic-pituitary-adrenal (HPA) axis. Hyperforin, another constituent of SJW, is active in vitro and has been proposed to be the active constituent for therapeutic efficacy in depression. We therefore examined if hyperforin has delayed effects on HPA axis control centers similar to those of Hypericum and hypericin. We used in situ hybridization histochemistry to examine in rats the effects of short-term (2 weeks) and long-term (8 weeks) oral administration of two hyperforin preparations, fluoxetine (positive control), and haloperidol (negative control) on the expression of genes involved in the regulation of the HPA axis. Fluoxetine (10 mg/kg) given daily for 8 weeks, but not 2 weeks, significantly decreased levels of corticotropinreleasing hormone (CRH) mRNA by 22% in the paraventricular nucleus (PVN) of the hypothalamus and tyrosine hydroxylase (TH) mRNA by 23% in the locus coeruleus. Fluoxetine increased levels of mineralocorticoid (MR) (17%), glucocorticoid (GR) (18%), and 5-HT 1A receptor (21%) mRNAs in the hippocampus at 8, but not 2, weeks. Comparable to haloperidol (1 mg/kg), neither the hyperforinrich CO 2 extract (27 mg/kg) nor hyperforin-trimethoxybenzoate (8 mg/kg) altered mRNA levels in brain structures relevant for HPA axis control at either time point. These data suggest that hyperforin and hyperforin derivatives are not involved in the regulation of genes that control HPA axis function.

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Section: Discussioncontrasting

confidence: 99%

Hyperforin-Containing Extracts of St John's Wort Fail to Alter Gene Transcription in Brain Areas Involved in HPA Axis Control in a Long-Term Treatment Regimen in Rats

Butterweck

Winterhoff²,

Herkenham

2003

Neuropsychopharmacol

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“…Major depression has been associated with abnormally reduced function of central serotonergic systems by abundant evidence from biochemical, challenge, imaging, and postmortem studies (Coppen et al, 1973;Charney et al, 1981;Lopez et al, 1998;Drevets et al, 1999). TD is an instructive paradigm for investigating the relationship between serotonergic function and depression.…”

Section: Serotonin Dopamine and Norepinephrinementioning

confidence: 99%

Discovering Endophenotypes for Major Depression

Hasler

Drevets

Manji

et al. 2004

Neuropsychopharmacol

1,013

739

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The limited success of genetic studies of major depression has raised questions concerning the definition of genetically relevant phenotypes. This paper presents strategies to improve the phenotypic definition of major depression by proposing endophenotypes at two levels: First, dissecting the depressive phenotype into key components results in narrow definitions of putative psychopathological endophenotypes: mood bias toward negative emotions, impaired reward function, impaired learning and memory, neurovegetative signs, impaired diurnal variation, impaired executive cognitive function, psychomotor change, and increased stress sensitivity. A review of the recent literature on neurobiological and genetic findings associated with these components is given. Second, the most consistent heritable biological markers of major depression are proposed as biological endophenotypes for genetic studies: REM sleep abnormalities, functional and structural brain abnormalities, dysfunctions in serotonergic, catecholaminergic, hypothalamic-pituitary-adrenocortical axis, and CRH systems, and intracellular signal transduction endophenotypes. The associations among the psychopathological and biological endophenotypes are discussed with respect to specificity, temporal stability, heritability, familiality, and clinical and biological plausibility. Finally, the case is made for the development of a new classification system in order to reduce the heterogeneity of depression representing a major impediment to elucidating the genetic and neurobiological basis of this common, severe, and often life-threatening illness.

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“…It has been observed that a lack of CRH-R1 leads to an increase in serotonin levels under basal and stressful conditions [14]. In addition, chronic stress causes a downregulation of 5-HT 1A receptor mRNA and binding in the hippocampus [81].…”

Section: Serotonergic Systemmentioning

confidence: 99%

Mechanisms of action of antidepressants: from neurotransmitter systems to signaling pathways

Taylor

Fricker

Devi

et al. 2005

Cellular Signalling

136

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Antidepressants are commonly used in the treatment of anxiety and depression, medical conditions that affect ~17-20% of the population. The clinical effects of antidepressants take several weeks to manifest, suggesting that these drugs induce adaptive changes in brain structures affected by anxiety and depression. In order to develop shorter-acting and more effective drugs for the treatment of anxiety and depression, it is important to understand how antidepressants bring about their beneficial effects. Recent reports suggest that antidepressants can induce neurogenesis in the adult brain, although the mechanisms involved are not clearly understood. In this review, we describe the different neurotransmitter systems that are affected by anxiety and depression and how they are modulated by antidepressant treatment with a focus on signaling molecules and pathways that are activated during neurotransmitter receptor induced neurogenesis.

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Regulation of Serotonin1A, Glucocorticoid, and Mineralocorticoid Receptor in Rat and Human Hippocampus: Implications for the Neurobiology of Depression

Cited by 616 publications

References 68 publications

Hyperforin-Containing Extracts of St John's Wort Fail to Alter Gene Transcription in Brain Areas Involved in HPA Axis Control in a Long-Term Treatment Regimen in Rats

Hyperforin-Containing Extracts of St John's Wort Fail to Alter Gene Transcription in Brain Areas Involved in HPA Axis Control in a Long-Term Treatment Regimen in Rats

Discovering Endophenotypes for Major Depression

Mechanisms of action of antidepressants: from neurotransmitter systems to signaling pathways

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