Mindfulness-based interventions (MBI) have been shown to be effective in increasing empathy in health professionals. Yet, more research is needed to analyse the specific influence of mindfulness exercises on biological variables involved in empathy, such as the biological system of oxytocin activity. In this study, we analyse the effects of a brief mindfulness session on positive and negative affect, state anxiety and salivary oxytocin (sOXT) in psychology students (N = 68). In the experimental group (n = 42), a mindfulness session was performed that included different guided meditation exercises. In the control group (n = 26), an emotion recognition exercise was carried out, along with a series of creative activities. Results showed that the mindfulness session was effective, because there was a significant reduction in negative affect (d = −.56, p < .001) and state anxiety (d = −.54, p = .007) in the experimental group. Likewise, there was an increase in sOXT (d = .99, p < .001) in this group, compared with the control group. Guided mindfulness meditation practice could be useful to reach an emotional and biological state that facilitates empathy. In this regard, the increase in sOXT after the mindfulness session adds further evidence about the biological mechanisms underlying the benefits of MBI on empathy.

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It is well established that repeated social defeat stress can induce negative long-term consequences such as increased anxiety-like behavior and enhances the reinforcing effect of psychostimulants in rodents. In the current study, we evaluated how the immune system may play a role in these long-term effects of stress. A total of 148 OF1 mice were divided into different experimental groups according to stress condition (exploration or social defeat) and pre-treatment (saline, 5 or 10 mg/kg of the anti-inflammatory indomethacin) before each social defeat or exploration episode. Three weeks after the last social defeat, anxiety was evaluated using an elevated plus maze paradigm. After this test, conditioned place preference (CPP) was induced by a subthreshold dose of cocaine (1 mg/kg). Biological samples were taken four hours after the first and the fourth social defeat, 3 weeks after the last defeat episode, and after the CPP procedure. Plasma and brain tissue (prefrontal cortex, striatum and hippocampus) were used to determine the levels of the pro-inflammatory cytokine interleukin 6 (IL-6). Results showed an increase of peripheral and brain IL-6 levels after the first and fourth social defeat that was reverted three weeks later. Intraperitoneal administration of the anti-inflammatory drug indomethacin before each episode of stress prevented this enhancement of IL-6 levels and also reversed the increase in the rewarding effects of cocaine in defeated mice. Conversely, this protective effect was not observed with respect to the anxiogenic consequences of social stress. Our results confirm the hypothesis of a modulatory proinflammatory contribution to stress-induced vulnerability to drug abuse disorders and highlight anti-inflammatory interventions as a potential therapeutic tool to treat stress-related addiction disorders.

Social defeat stress induces a long-lasting increase in anxiety like behavior. • Social defeat stress enhances rewarding properties of cocaine. • Social defeat stress increase BDNF levels in prefrontal cortex. • Oxytocin treatment favors the extinction of cocaine-associated memories. • Oxytocin administration counteracts stress effect in anxiety and in BDNF levels.

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