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Research ArticleNEUROPHARMACOLOGY

The Effects of Chronic Treatment with the Mood Stabilizers Valproic Acid and Lithium on Corticotropin-Releasing Factor Neuronal Systems

Michelle L. Gilmor, Kelly H. Skelton, Charles B. Nemeroff and Michael J. Owens
Journal of Pharmacology and Experimental Therapeutics May 2003, 305 (2) 434-439; DOI: https://doi.org/10.1124/jpet.102.045419
Michelle L. Gilmor
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Kelly H. Skelton
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Charles B. Nemeroff
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Michael J. Owens
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Abstract

Corticotropin-releasing factor (CRF) plays a preeminent role in coordinating the endocrine, autonomic, and behavioral responses to stress. Dysregulation of both hypothalamic and extrahypothalamic CRF systems have been reported in patients with major depression and post-traumatic stress disorder. Moreover, effective treatment of these conditions leads to normalization of these CRF systems. Although there is virtually no data concerning alterations of CRF systems in bipolar disorder (manic depressive illness), previous work indicates that valproic acid, an anticonvulsant also effective in the treatment of acute mania, alters central CRF neuronal systems. In the current studies, we chronically administered valproic acid and lithium, two clinically effective mood stabilizers, in nonstressed rats to extend our previous findings. Chronic valproic acid administration decreased CRF mRNA expression in the paraventricular nucleus of the hypothalamus; lithium administration increased CRF mRNA expression in the central nucleus of the amygdala. Although valproic acid increased CRF1 receptor mRNA expression in the cortex, CRF1 receptor binding was decreased in both the basolateral amygdala and cortex, suggesting that chronic valproate treatment may in fact dampen the overall tone in this central stress pathway. Valproate treatment decreased CRF2A mRNA expression in both the lateral septum and hypothalamus, although CRF2A receptor binding was unchanged. Lithium administration decreased CRF1 mRNA expression in both the amygdala and frontal cortex, but CRF1 receptor binding also remained unchanged. These results suggest that the therapeutic actions of these mood stabilizers may, in part, result from their actions on central CRF neuronal systems. The distinct actions of each drug on CRF systems may underlie their synergistic clinical effects.

Footnotes

  • This work was supported by the National Institute of Mental Health Grant 42088, Emory University Conte Center, and an unrestricted grant from Abbott Laboratories.

  • DOI: 10.1124/jpet.102.045419

  • Abbreviations:
    CRF
    corticotropin-releasing factor
    CNS
    central nervous system
    HPA axis
    hypothalamic-pituitary-adrenal
    VPA valproic acid
    ACTH, adrenocorticotropic hormone
    BNST
    bed nucleus of the stria terminalis
    CeA
    central amygdaloid nucleus
    PVN
    paraventricular nucleus of hypothalamus
    BLA
    basolateral amygdaloid nucleus
    F/P CTX
    frontal/parietal cortex
    LS
    lateral septum
    VMH
    ventromedial hypothalamus
    • Received October 9, 2002.
    • Accepted January 21, 2003.
  • The American Society for Pharmacology and Experimental Therapeutics
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Journal of Pharmacology and Experimental Therapeutics: 305 (2)
Journal of Pharmacology and Experimental Therapeutics
Vol. 305, Issue 2
1 May 2003
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Research ArticleNEUROPHARMACOLOGY

The Effects of Chronic Treatment with the Mood Stabilizers Valproic Acid and Lithium on Corticotropin-Releasing Factor Neuronal Systems

Michelle L. Gilmor, Kelly H. Skelton, Charles B. Nemeroff and Michael J. Owens
Journal of Pharmacology and Experimental Therapeutics May 1, 2003, 305 (2) 434-439; DOI: https://doi.org/10.1124/jpet.102.045419

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Research ArticleNEUROPHARMACOLOGY

The Effects of Chronic Treatment with the Mood Stabilizers Valproic Acid and Lithium on Corticotropin-Releasing Factor Neuronal Systems

Michelle L. Gilmor, Kelly H. Skelton, Charles B. Nemeroff and Michael J. Owens
Journal of Pharmacology and Experimental Therapeutics May 1, 2003, 305 (2) 434-439; DOI: https://doi.org/10.1124/jpet.102.045419
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