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Open Access 01-08-2019 | Antidepressant Drugs | Article

Novel therapeutic potential of angiotensin receptor 1 blockade in a rat model of diabetes-associated depression parallels altered BDNF signalling

Authors: Lilla Lenart, Dora B. Balogh, Nikolett Lenart, Adrienn Barczi, Adam Hosszu, Tamas Farkas, Judit Hodrea, Attila J. Szabo, Krisztian Szigeti, Adam Denes, Andrea Fekete

Published in: Diabetologia | Issue 8/2019

Abstract

Aims/hypothesis

Diabetes is a worldwide epidemic linked with diverse diseases of the nervous system, including depression. A few studies suggested a connection between renin–angiotensin–aldosterone system blockers and reduced depressive symptoms, although underlying mechanisms are unclear. Here we investigated the antidepressant effect and the mechanisms of action of the angiotensin receptor 1 blocker (ARB) losartan in an experiential model of diabetes-associated depression.

Methods

Experimental diabetes was induced by streptozotocin in adult male Wistar rats. After 5 weeks of diabetes, rats were treated for 2 weeks with a non-pressor oral dose of losartan (20 mg/kg). In protocol 1, cerebrovascular perfusion and glial activation were evaluated by single-photon emission computed tomography–MRI and immunohistochemistry. In protocol 2, behaviour studies were performed (forced swim test and open field test). Hippocampal proinflammatory response and brain-derived neurotrophic factor (BDNF) signalling were also assessed.

Results

Here, we show that diabetic rats exhibit depression-like behaviour, which can be therapeutically reversed by losartan. This action of losartan occurs via changes in diabetes-induced neuroinflammatory responses rather than altered cerebral perfusion. We also show that as a part of its protective effect losartan restores BDNF production in astrocytes and facilitates BDNF–tropomyosin receptor kinase B–cAMP response element-binding protein signalling in the diabetic brain.

Conclusions/interpretation

We identified a novel effect of losartan in the nervous system that may be implemented to alleviate symptoms of diabetes-associated depression. These findings explore a new therapeutic horizon for ARBs as possible antidepressants and suggest that BDNF could be a target of future drug development in diabetes-induced complications.

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Title: Novel therapeutic potential of angiotensin receptor 1 blockade in a rat model of diabetes-associated depression parallels altered BDNF signalling
Authors: Lilla Lenart
Dora B. Balogh
Nikolett Lenart
Adrienn Barczi
Adam Hosszu
Tamas Farkas
Judit Hodrea
Attila J. Szabo
Krisztian Szigeti
Adam Denes
Andrea Fekete
Publication date: 01-08-2019
Publisher: Springer Berlin Heidelberg
Keywords: Antidepressant Drugs
Losartan
Affective Disorder
Affective Disorder
Antidepressant Drugs
Published in: Diabetologia / Issue 8/2019
Print ISSN: 0012-186X
Electronic ISSN: 1432-0428
DOI: https://doi.org/10.1007/s00125-019-4888-z

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