Anxiety is the brain's response to dangerous or stressful situations. Exposure to stressors can cause gut microbiota dysbiosis and activate the hypothalamic-pituitary-adrenal (HPA) axis, leading to the secretion of glucocorticoids associated with anxiety. Recent studies have reported that probiotics can attenuate anxiety-like behaviors by modulation of the gut microbiome composition. The present study aimed to investigate the effects of Saccharomyces boulardii (Sb) administration on anxiety-like behaviors induced by lipopolysaccharide (LPS) in rats. The animals were randomly divided into four groups (Control, LPS, Sb + LPS, and Sb). All animals were orally treated with saline or S. boulardii (1010 CFU/ml/rat) for 28 days. They were also injected with saline or LPS (250 μg/kg/day) intraperitoneally from day 14 until day 22. Anxiety-like behaviors were assessed using the elevated plus-maze and open-field tests. Besides, the serum levels of cortisol, corticosterone, serotonin, and brain-derived neurotrophic factor (BDNF) were measured. The results revealed that S. boulardii could attenuate LPS-induced anxiety-like behaviors. The findings also showed that oral administration of S. boulardii significantly attenuated the elevated levels of cortisol and corticosterone in the LPS-induced model. Moreover, S. boulardii alleviated the decremental effect of LPS on the serum serotonin and BDNF levels. According to the present findings, S. boulardii can prevent LPS-induced anxiety-like behaviors, probably through modulation of the HPA axis and the gut microbiome.
Keywords: Anxiety; BDNF; Corticosterone; Hypothalamic-Pituitary-Adrenal axis; Probiotic; Serotonin.
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