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Bahamonde T, Quintana-Donoso D, Linsambarth S, Jerez-Baraona JM, Peña F, Tamburini G, Verdugo DA, Lemunao Y, Ogaz F, Díaz-Galarce R, Rojas S, Stehberg J. The insula mediates the effects of glucocorticoids in anxiety. Neuropharmacology 2023:109620. [PMID: 37263575 DOI: 10.1016/j.neuropharm.2023.109620] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/28/2022] [Revised: 05/18/2023] [Accepted: 05/28/2023] [Indexed: 06/03/2023]
Abstract
Increased activity in the insula has been consistently reported to be associated with anxiety and anxiety-related disorders. However, little is known on how the insula regulates anxiety. The present study aims at determining the role of the insula on the effects of glucocorticoids in anxiety. A combination of pharmacological manipulations, including blockade of adrenal GC synthesis by metyrapone and intra-insular microinjections of corticosterone, corticosterone-BSA, mineralocorticoid receptor (MR) antagonist spironolactone and glucocorticoid receptor (GR) antagonist mifepristone, were used to assess the short-term (5 min) effects of intra-insular corticosterone in two anxiety-like behaviors in male Sprague-Dawley rats. The elevated plus maze (EPM) and Novelty Suppressed Feeding (hyponeophagia) were utilized. We found that corticosterone in the insula is sufficient to prevent the anxiolytic effects corticosterone synthesis blockade in anxiety, and that intra-insular corticosterone has anxiolytic or anxiogenic effects depending on the amount of corticosterone microinjected, without affecting the HPA axis. Glucocorticoid anxiolytic effects in the insula are mediated by MRs, while its anxiogenic effects are dependent on a mifepristone-sensitive membrane-bound mechanism. Anxiety appears to be modulated at the insula through a competition between fast MR-dependent anxiolytic and membrane-associated mifepristone-sensitive anxiogenic signaling pathways that orchestrate the behavioral response to stress and determines the resulting level of anxiety.
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Affiliation(s)
- Tamara Bahamonde
- Laboratorio de Neurobiologia, Instituto de Ciencias Biomédicas, Facultad de Medicina y Facultad de Ciencias de la Vida, Universidad Andres Bello, Santiago, Chile
| | - Daisy Quintana-Donoso
- Laboratorio de Neurobiologia, Instituto de Ciencias Biomédicas, Facultad de Medicina y Facultad de Ciencias de la Vida, Universidad Andres Bello, Santiago, Chile
| | - Sergio Linsambarth
- Laboratorio de Neurobiologia, Instituto de Ciencias Biomédicas, Facultad de Medicina y Facultad de Ciencias de la Vida, Universidad Andres Bello, Santiago, Chile
| | - Juan Manuel Jerez-Baraona
- Laboratorio de Neurobiologia, Instituto de Ciencias Biomédicas, Facultad de Medicina y Facultad de Ciencias de la Vida, Universidad Andres Bello, Santiago, Chile
| | - Francisca Peña
- Laboratorio de Neurobiologia, Instituto de Ciencias Biomédicas, Facultad de Medicina y Facultad de Ciencias de la Vida, Universidad Andres Bello, Santiago, Chile
| | - Giovanni Tamburini
- Laboratorio de Neurobiologia, Instituto de Ciencias Biomédicas, Facultad de Medicina y Facultad de Ciencias de la Vida, Universidad Andres Bello, Santiago, Chile
| | - Daniel Antonio Verdugo
- Laboratorio de Neurobiologia, Instituto de Ciencias Biomédicas, Facultad de Medicina y Facultad de Ciencias de la Vida, Universidad Andres Bello, Santiago, Chile
| | - Yordan Lemunao
- Laboratorio de Neurobiologia, Instituto de Ciencias Biomédicas, Facultad de Medicina y Facultad de Ciencias de la Vida, Universidad Andres Bello, Santiago, Chile
| | - Francisco Ogaz
- Laboratorio de Neurobiologia, Instituto de Ciencias Biomédicas, Facultad de Medicina y Facultad de Ciencias de la Vida, Universidad Andres Bello, Santiago, Chile
| | - Raúl Díaz-Galarce
- Laboratorio de Neurobiologia, Instituto de Ciencias Biomédicas, Facultad de Medicina y Facultad de Ciencias de la Vida, Universidad Andres Bello, Santiago, Chile
| | - Sebastian Rojas
- Laboratorio de Neurobiologia, Instituto de Ciencias Biomédicas, Facultad de Medicina y Facultad de Ciencias de la Vida, Universidad Andres Bello, Santiago, Chile
| | - Jimmy Stehberg
- Laboratorio de Neurobiologia, Instituto de Ciencias Biomédicas, Facultad de Medicina y Facultad de Ciencias de la Vida, Universidad Andres Bello, Santiago, Chile.
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Rojas S, Diaz-Galarce R, Jerez-Baraona JM, Quintana-Donoso D, Moraga-Amaro R, Stehberg J. The insula modulates arousal-induced reluctance to try novel tastes through adrenergic transmission in the rat. Front Behav Neurosci 2015; 9:164. [PMID: 26175672 PMCID: PMC4484226 DOI: 10.3389/fnbeh.2015.00164] [Citation(s) in RCA: 9] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/09/2015] [Accepted: 06/12/2015] [Indexed: 11/28/2022] Open
Abstract
Reluctance to try novel tastes (neophobia) can be exacerbated in arousing situations, such as when children are under social stress or in rodents, when the new taste is presented in a high arousal context (HA) compared to a low arousal context (LA). The present study aimed at determining whether adrenergic transmission at the Insula regulates the reluctance to try novel tastes induced by arousing contexts. To this end, a combination of systemic and intra-insular manipulations of adrenergic activity was performed before the novel taste (saccharin 0.1%) was presented either in LA or HA contexts in rats. Our results show that systemic adrenergic activity modulates reluctance to try novel tastes. Moreover, intra-insular microinjections of propranolol or norepinephrine (NE) were found to modulate the effects of arousing contexts on reluctance to try novel tastes. Finally, intra-insular propranolol blocked epinephrine-induced increased reluctance, while intra-insular NE blocked oral propranolol-induced decreases in reluctance and increased the reluctance to try novel tastes presented in low arousing contexts. In conclusion, our results suggest that the insula is a critical site for regulating the effects of arousal in the reluctance to try novel tastes via the adrenergic system.
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Affiliation(s)
- Sebastián Rojas
- Laboratorio de Neurobiologia, Centro de Investigaciones Biomedicas, Universidad Andres Bello Santiago, Chile
| | - Raúl Diaz-Galarce
- Laboratorio de Neurobiologia, Centro de Investigaciones Biomedicas, Universidad Andres Bello Santiago, Chile
| | - Juan Manuel Jerez-Baraona
- Laboratorio de Neurobiologia, Centro de Investigaciones Biomedicas, Universidad Andres Bello Santiago, Chile
| | - Daisy Quintana-Donoso
- Laboratorio de Neurobiologia, Centro de Investigaciones Biomedicas, Universidad Andres Bello Santiago, Chile
| | - Rodrigo Moraga-Amaro
- Laboratorio de Neurobiologia, Centro de Investigaciones Biomedicas, Universidad Andres Bello Santiago, Chile
| | - Jimmy Stehberg
- Laboratorio de Neurobiologia, Centro de Investigaciones Biomedicas, Universidad Andres Bello Santiago, Chile
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