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Chronic social isolation exerts opposing sex-specific consequences on serotonin neuronal excitability and behaviour.
Neuropharmacology ( IF 4.6 ) Pub Date : 2020-02-21 , DOI: 10.1016/j.neuropharm.2020.108015
David K Oliver 1 , Katheron Intson 2 , Derya Sargin 1 , Saige K Power 1 , Janice McNabb 1 , Amy J Ramsey 3 , Evelyn K Lambe 4
Affiliation  

Social isolation raises the risk for mood disorders associated with serotonergic disruption. Yet, the underlying mechanisms by which the stress of social isolation increases risk are not well understood. Men and women are differently vulnerable; however, this modulating role of sex is challenging to study in humans under carefully controlled conditions. Therefore, we investigated this question in mice of both sexes, asking how the long-term stress of social isolation (from weaning into adulthood) affects the excitability of serotonin neurons in the dorsal raphe nucleus as well as mouse behaviour. The electrophysiological experiments and the first set of behavioural tests were conducted in young adult mice, with additional behavioural assays completed as the mice matured to assess the stability of their behavioural phenotype. We found that social isolation exerted seemingly-opposite effects in male and female mice, relative to their respective group-housed littermate controls. This distinctive pattern was observed for the effect of social isolation on the control of serotonergic neuron excitability via the SK family of calcium-activated potassium channels. Furthermore, we observed a similar and consistent pattern on tests relevant to assessing the efficacy of anti-depressant medicines, including the forced swim test, the novelty-suppressed feeding test, and the sucrose preference test. These findings underscore the concept that stress-elicited illness manifests distinctly in males and females and that treatments aimed at restoring serotonergic function may require a sex-specific approach.



中文翻译:

长期的社会隔离对5-羟色胺神经元的兴奋性和行为具有相反的性别特异性后果。

社会隔离增加了与血清素能破坏相关的情绪障碍的风险。然而,人们对社会孤立的压力增加风险的潜在机制还不甚了解。男性和女性的脆弱性不同。然而,在人类精心控制的条件下,性别的这种调节作用对人类的研究具有挑战性。因此,我们调查了这两种性别的小鼠中的这个问题,询问社会隔离的长期压力(从断奶到成年)如何影响背沟核中5-羟色胺神经元的兴奋性以及小鼠的行为。在年轻的成年小鼠中进行了电生理实验和第一组行为测试,随着小鼠的成熟,完成了额外的行为分析以评估其行为表型的稳定性。我们发现,社交隔离对雄性和雌性小鼠发挥了看似相反的作用,相对于它们各自的群居同窝对照。观察到这种独特的模式是通过SK家族的钙激活钾通道,社会隔离对血清素神经元神经兴奋性的控制作用。此外,我们在与评估抗抑郁药疗效相关的测试中观察到了相似且一致的模式,包括强迫游泳测试,新颖性抑制喂养测试和蔗糖偏爱测试。这些发现强调了这样一种概念,即压力引起的疾病在男性和女性中明显表现出来,并且旨在恢复血清素能功能的治疗可能需要针对性别的方法。相对于它们各自的群居同窝对照。观察到这种独特的模式是通过SK家族的钙激活钾通道,社会隔离对5-羟色胺神经元兴奋性的控制作用。此外,我们在与评估抗抑郁药疗效相关的测试中观察到了相似且一致的模式,包括强迫游泳测试,新颖性抑制喂养测试和蔗糖偏爱测试。这些发现强调了这样一种概念,即压力引起的疾病在男性和女性中明显表现出来,并且旨在恢复血清素能功能的治疗可能需要针对性别的方法。相对于它们各自的群居同窝对照。观察到这种独特的模式是通过SK家族的钙激活钾通道,社会隔离对血清素神经元神经兴奋性的控制作用。此外,我们在与评估抗抑郁药疗效相关的测试中观察到了相似且一致的模式,包括强迫游泳测试,新颖性抑制喂养测试和蔗糖偏爱测试。这些发现强调了这样一种概念,即由压力引起的疾病在男性和女性中明显表现出来,并且旨在恢复血清素能功能的治疗可能需要针对性别的方法。观察到这种独特的模式是通过SK家族的钙激活钾通道,社会隔离对血清素神经元神经兴奋性的控制作用。此外,我们在与评估抗抑郁药疗效相关的测试中观察到了相似且一致的模式,包括强迫游泳测试,新颖性抑制喂养测试和蔗糖偏爱测试。这些发现强调了这样一种概念,即压力引起的疾病在男性和女性中明显表现出来,并且旨在恢复血清素能功能的治疗可能需要针对性别的方法。观察到这种独特的模式是通过SK家族的钙激活钾通道,社会隔离对血清素神经元神经兴奋性的控制作用。此外,我们在与评估抗抑郁药疗效相关的测试中观察到了相似且一致的模式,包括强迫游泳测试,新颖性抑制喂养测试和蔗糖偏爱测试。这些发现强调了这样一种概念,即压力引起的疾病在男性和女性中明显表现出来,并且旨在恢复血清素能功能的治疗可能需要针对性别的方法。新颖性抑制喂养测试和蔗糖偏好测试。这些发现强调了这样一种概念,即压力引起的疾病在男性和女性中明显表现出来,并且旨在恢复血清素能功能的治疗可能需要针对性别的方法。新颖性抑制喂养测试和蔗糖偏好测试。这些发现强调了这样一种概念,即压力引起的疾病在男性和女性中明显表现出来,并且旨在恢复血清素能功能的治疗可能需要针对性别的方法。

更新日期:2020-02-21
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