Study summary · research use only
A novel butyrylcholinesterase inhibitor induces antidepressant, pro-cognitive, and anti-anhedonic effects in Flinders Sensitive Line rats: The role of the ghrelin-dopamine cascade
Plain-language summary
Paraphrased from the published abstract below — not a verdict on whether anything works.
In this rat study using Flinders Sensitive Line (FSL) rats, a model of major depressive disorder (MDD), the authors evaluated a novel butyrylcholinesterase inhibitor (BChEI) using the forced swim, sucrose preference, and novel object recognition tests, alongside measures of BDNF, acetylcholine, brain monoamines, and serum growth hormone and ghrelin. FSL rats were reported to have lower ghrelin ratios, BDNF, ACh, dopamine, and growth hormone levels than controls. Both BChEI and escitalopram were reported to reduce despair-related behavior, with BChEI outperforming escitalopram on reward-related and cognitive measures. BChEI treatment was reported to increase ghrelin ratios and brain dopamine without altering serotonin, ACh, or BDNF; the ghrelin receptor antagonist D-Lys-3-GHRP-6 reversed these behavioral changes and reduced BDNF and dopamine.
Abstract
Major depressive disorder (MDD) is often treatment resistant, particularly in addressing anhedonia and cognitive deficits. Novel pharmacological strategies are needed. While butyrylcholinesterase, ghrelin, and dopamine (DA) have been well studied in the context of stress and MDD, their interaction remains unclear. The dose-dependent antidepressant effects of a novel butyrylcholinesterase inhibitor (BChEI) were evaluated in the Flinders Sensitive Line (FSL) rat model of MDD. Behavioural assessments included the forced swim test (despair), sucrose preference test (reward-related), and novel object recognition test (cognition). Brain-derived neurotrophic factor (BDNF), acetylcholine (ACh), and brain monoamines were analysed, as well as serum growth hormone and acyl- and desacyl-ghrelin. To confirm the role of ghrelin, pharmacological exploration was undertaken using the ghrelin receptor antagonist, D-Lys-3-GHRP-6. FSL rats had significantly lower ghrelin ratios, BDNF, ACh, DA and growth hormone levels. In FSL rats, both BChEI and escitalopram significantly reduced despair. BChEI significantly outperformed escitalopram in enhancing reward-related and cognitive behaviours. Biochemically, BChEI treatment significantly increased ghrelin ratios and brain DA levels without altering brain 5-HT, ACh or BDNF. D-Lys-3-GHRP-6 significantly reversed the antidepressant-like, rewarding, and pro-cognitive effects of BChEI, accompanied by significant reductions in BDNF and DA. FSL rats display impaired ghrelin, DA, serotonin, growth hormone, and BDNF signalling, akin to MDD. BChEI exerts antidepressant-like effects across despair, reward, and cognitive domains, most likely via the BChE-ghrelin-DA cascade. Reversal of these effects by ghrelin antagonism underscores the critical role of ghrelin, specifically via growth hormone secretagogue receptor-ghrelin interaction. These findings suggest a potentially novel multimodal neurobiological target for the treatment of MDD.
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