The probiotic Bifidobacteria infantis: An assessment of potential antidepressant properties in the rat

益生菌 5-羟色胺能 单胺类 行为绝望测验 肠-脑轴 抗抑郁药 血清素 免疫系统 刺激 药理学 内科学 内分泌学 医学 生物 海马体 免疫学 细菌 受体 遗传学
作者
Lieve Desbonnet,Lillian Garrett,Gerard Clarke,John Bienenstock,Timothy G. Dinan
出处
期刊:Journal of Psychiatric Research [Elsevier]
卷期号:43 (2): 164-174 被引量:834
标识
DOI:10.1016/j.jpsychires.2008.03.009
摘要

It is becoming increasingly apparent that probiotics are important to the health of the host. The absence of probiotic bacteria in the gut can have adverse effects not only locally in the gut, but has also been shown to affect central HPA and monoaminergic activity, features that have been implicated in the aetiology of depression. To evaluate the potential antidepressant properties of probiotics, we tested rats chronically treated with Bifidobacteria infantis in the forced swim test, and also assessed the effects on immune, neuroendocrine and central monoaminergic activity. Sprague-Dawley rats were treated for 14 days with B. infantis. Probiotic administration in naive rats had no effect on swim behaviours on day 3 or day 14 following the commencement of treatment. However, there was a significant attenuation of IFN-gamma, TNF-alpha and IL-6 cytokines following mitogen stimulation (p<0.05) in probiotic-treated rats relative to controls. Furthermore, there was a marked increase in plasma concentrations of tryptophan (p<0.005) and kynurenic acid (p<0.05) in the bifidobacteria-treated rats when compared to controls. Bifidobacteria treatment also resulted in a reduced 5-HIAA concentration in the frontal cortex and a decrease in DOPAC in the amygdaloid cortex. The attenuation of pro-inflammatory immune responses, and the elevation of the serotonergic precursor, tryptophan by bifidobacteria treatment, provides encouraging evidence in support of the proposition that this probiotic may possess antidepressant properties. However, these findings are preliminary and further investigation into the precise mechanisms involved, is warranted.
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