Induction of depression-related behaviors by reactivation of chronic Toxoplasma gondii infection in mice
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Although Toxoplasma gondii (T. gondii) infection is relevant to many psychiatric disorders, the fundamental mechanisms of its neurobiological correlation with depression are poorly understood. Here, we show that reactivation of chronic infection by an immunosuppressive regimen caused induction of depressive-like behaviors without obvious sickness symptoms. However, the depression-related behaviors in T. gondii-infected mice, specifically, reduced sucrose preference and increased immobility in the forced-swim test were observed at the reactivation stage, but not in the chronic infection. Interestingly, reactivation of T. gondii was associated with production of interferon-gamma and activation of brain indoleamine 2, 3-dioxygenase, which converts tryptophan to kynurenine and makes it unavailable for serotonin synthesis. Furthermore, serotonin turnover to its major metabolite, 5-hydroxyindoleacetic acid, was also enhanced at the reactivation stage. Thus, enhanced tryptophan catabolic shunt and serotonin turnover may be implicated in development of depressive-like behaviors in mice with reactivated T. gondii. (C) 2015 Elsevier B.V. All rights reserved.
収録刊行物
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- Behavioural Brain Research
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Behavioural Brain Research 298 125-133, 2016-02-01
Elsevier
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詳細情報 詳細情報について
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- CRID
- 1050282812562016000
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- NII論文ID
- 120006402299
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- NII書誌ID
- AA00108669
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- ISSN
- 01664328
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- 本文言語コード
- en
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- 資料種別
- journal article
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- データソース種別
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- IRDB
- CiNii Articles