期刊
BIOLOGICAL PSYCHIATRY
卷 88, 期 5, 页码 415-425出版社
ELSEVIER SCIENCE INC
DOI: 10.1016/j.biopsych.2020.02.005
关键词
Angiotensin-converting enzyme inhibitor; Bradykinin; Captopril; Cdc42; MDD; mTORC1
资金
- Foundation for Innovative Research Groups of NSFC [81721005]
- National Natural Science Foundation of China [81773712, 81471377, 81671438, 81473198, 81673414]
- Program for Changjiang Scholars and Innovative Research Team in University [IRT13016]
- Program for Academic Frontier Youth Team of Tongji Medical College, Huazhong University of Science and Technology
- Integrated Innovative Team for Major Human Diseases Program of Tongji Medical College, Huazhong University of Science and Technology
BACKGROUND: Angiotensin-converting enzyme inhibitors (ACEIs) are widely prescribed antihypertensive agents. Intriguingly, case reports and clinical trials have indicated that ACEIs, including captopril and lisinopril, may have a rapid mood-elevating effect in certain patients, but few experimental studies have investigated their value as fastonset antidepressants. METHODS: The present study consisted of a series of experiments using biochemical assays, immunohistochemistry, and behavioral techniques to examine the effect and mechanism of captopril on depressive-like behavior in 2 animal models, the chronic unpredictable stress model and the chronic social defeat stress model. RESULTS: Captopril (19.5 or 39 mg/kg, intraperitoneal injection) exerted rapid antidepressant activity in mice treated under the chronic unpredictable stress model and mice treated under the chronic social defeat stress model. Pharmacokinetic analysis revealed that captopril crossed the blood-brain barrier and that lisinopril, another ACEI with better blood-brain barrier permeability, exerted a faster and longer-lasting effect at a same molar equivalent dose. This antidepressant effect seemed to be independent of the renin-angiotensin system, but dependent on the bradykinin (BK) system, since the decreased BK detected in the stressed mice could be reversed by captopril. The hypofunction of the downstream effector of BK, Cdc42 (cell division control protein 42) homolog, contributed to the stress-induced loss of dendritic spines, which was rapidly reversed by captopril via activating the mTORC1 (mammalian target of rapamycin complex 1) pathway. CONCLUSIONS: Our findings indicate that the BK-dependent activation of mTORC1 may represent a promising mechanism underlying antidepressant pharmacology. Considering their affordability and availability, ACEIs may emerge as a novel fast-onset antidepressant, especially for patients with comorbid depression and hypertension.
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