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Abstract Title:

Exercise exerts an anxiolytic effect against repeated restraint stress through 5-HT-mediated suppression of the adenosine Areceptor in the basolateral amygdala.

Abstract Source:

Psychoneuroendocrinology. 2019 Jun 12. Epub 2019 Jun 12. PMID: 31248747

Abstract Author(s):

Yea-Hyun Leem, Jee-Hun Jang, Jin-Sun Park, Hee-Sun Kim

Article Affiliation:

Yea-Hyun Leem

Abstract:

Repeated or chronic stressful stimuli induce emotion- and mood-related abnormalities, such as anxiety and depression. Conversely, regular exercise exerts protective effects. Here, we found that exercise recovered anxiety-like behaviors, as measured using the open field and elevated plus maze tests in an anxiety mouse model. In addition to behavioral improvement, exercise enhanced the synaptic density of the 5-hydroxytryptamine 2A receptor (5-HTR), but not the 5-HTR in the basolateral amygdala (BLA) region in this mouse model. Furthermore, global treatment with a selective 5-HTR antagonist (MDL11930) generated an anxiety phenotype. Thus, synaptic recruitment of 5-HTR in BLA neurons may mediate the anxiolytic effects of exercise. The exercise regimen also reduced adenosine Areceptor (AR)-mediated protein kinase A (PKA) activation, and the anxiolytic effect of the exercise was blunted by local activation of AR within the BLA using CGS21680, a selective AR agonist. Particularly, AR-mediated PKA activity was shown to be dependent on 5-HTR signaling in the BLA. These results imply that repeated stress upregulates AR-mediated adenosine signaling to facilitate PKA activation, whereas regular exercise inhibits AR function by increasing 5-HTR in the BLA. Accordingly, this integrated modulation of 5-HT and adenosine signaling, via 5-HTR and AR respectively, may be a mechanism underlying the anxiolytic effect of regular exercise.

Study Type : Animal Study
Additional Links
Therapeutic Actions : Exercise : CK(2795) : AC(411)
Pharmacological Actions : Anti-Anxiety Agents : CK(356) : AC(59)

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