Endogenous activation of group-II metabotropic glutamate receptors inhibits the hypothalamic–pituitary–adrenocortical axis
Abstract
Systemic injection of the mGlu2/3 receptor antagonist, LY341495 (1 mg/kg, i.p.), increased plasma corticosterone in mice to an extent similar to that induced by the despair test. Treatment with the mGlu2/3 receptor agonist, LY379268 (1 mg/kg, i.p.), or the non-competitive mGlu5 receptor antagonist, MPEP (5 mg/kg, i.p.), failed to induce significant changes in corticosterone levels. Searching for a site of action of LY341495, we examined the expression of mGlu receptor subtypes in the various anatomical regions of the mouse hypothalamic-pituitary-adrenal (HPA) axis. Only mGlu5 and -7 receptor mRNAs were detected in the adrenal gland by RT-PCR, whereas mGlu -1, -3, -4, -5, -7 and -8 receptor mRNAs were detected in the anterior pituitary. All transcripts (with the exception of mGlu5 and mGlu6 receptor mRNAs) were detected in the hypothalamus. However, Western blot analysis showed the presence of mGlu2/3 receptor proteins only in the hypothalamus and not in the anterior pituitary. This was consistent with functional data showing that LY341495 (0.1 and 1 microM) failed to affect ACTH secretion from isolated mouse anterior pituitaries. Moving from these observations, we examined whether LY341495 could activate the HPA axis by inhibiting mGlu2/3 receptors at hypothalamic level. We measured the release of corticotropin releasing hormone (CRH) in isolated mouse hypothalami incubated in the presence of subtype-selective mGlu receptor agonists or antagonists. Among all the drugs we have tested, only LY341495 was able to increase CRH secretion. With high concentrations of LY341495 (1 microM) this increase was similar to that induced by 50 mM K(+). The action of LY341495 was prevented by the combined application of the mGlu2/3 receptor agonist, LY379268. We conclude that group-II mGlu receptors tonically regulate the HPA axis by controlling CRH secretion at hypothalamic level.
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Mice administered with Group II antagonists in vivo experienced an increase in corticosterone that mimicked the response to the forced-swim test.
“Mice administered with Group II antagonists in vivo experienced an increase in corticosterone that mimicked the response to the forcedswim (behavioral despair) test (Scaccianoce et al., 2003).”
From Glutamate receptors in domestication and modern human evolution (2020) · cites this paper as Scaccianoce et al., 2003
In vitro antagonism of Group II metabotropic receptors in hypothalamic slices increases CRH signaling, whereas no other metabotropic receptor agonists or antagonists had this effect.
“In vitro antagonism of Group II metabotropic receptors in hypothalamic slices has been shown to increase CRH signaling, whereas no other metabotropic receptor agonists or antagonists had this effect.”
From Glutamate receptors in domestication and modern human evolution (2020) · cites this paper as Scaccianoce et al., 2003
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- Authors
- Scaccianoce, S., Matrisciano, F., Del Bianco, P., Caricasole, A., Di Giorgi Gerevini, V., Cappuccio, I., Melchiorri, D., Battaglia, G., & Nicoletti, F.
- Affiliations
- Sapienza University of Rome (IT)
- Siena Biotech (Italy) (IT)
- Istituto Neurologico Mediterraneo (IT)
- Corresponding author
- Nicoletti, F.
- Venue
- Neuropharmacology
- Publisher
- Elsevier BV
- Published
- 2003-04
- Volume
- 44
- Issue
- 5
- Pages
- 555-561
- ISSN
- 0028-3908 (ISSN-L)
- OpenAlex
- W2151934215
- Cited by
- 54
- References
- 29
- Citations by year
- 2025: 1 · 2024: 2 · 2022: 2 · 2020: 1 · 2019: 2 · 2016: 1 · 2015: 4 · 2014: 2 · 2012: 4
- FWCI
- 2.14
- Type
- journal article
- Language
- en
- Open access
- closed
- Locations
- Neuropharmacology (publishedVersion)
- PubMed (publishedVersion)
- IRIS Research product catalog (Sapienza University of Rome) (submittedVersion)
- Funders
- Eli Lilly and Company
- Topics
- Life Sciences › Neuroscience › Behavioral Neuroscience › Stress Responses and Cortisol
- Life Sciences › Neuroscience › Cellular and Molecular Neuroscience › Neuroscience and Neuropharmacology Research
- Life Sciences › Neuroscience › Cellular and Molecular Neuroscience › Neuropeptides and Animal Physiology
- Keywords
- group II metabotropic glutamate receptors, mGlu2/3 receptors, hypothalamic-pituitary-adrenal axis, corticosterone, corticotropin-releasing factor, ACTH secretion, LY341495, LY379268, MPEP, mGlu5 receptor, anterior pituitary, hypothalamus
- MeSH terms
- Adrenal Glands, Animals, Corticosterone, Corticotropin-Releasing Hormone, Hypothalamo-Hypophyseal System, Hypothalamus, Male, Pituitary-Adrenal System, Receptors, Metabotropic Glutamate, Excitatory Amino Acid Agonists, Excitatory Amino Acid Antagonists, Mice, Rats, In Vitro Techniques
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