Abstract
Social isolation imposes physiological and behavioural effects that can have a severe impact on health, but the underlying mechanisms remain poorly understood. We reason that mechanisms responsible for the motivation to interact with others and the cognitive assessment of social interactions also mediate the effects of the lack of social interactions. This is because social isolation stress depends on the ability to maintain homeostasis against objective changes from sensory deprivation under physical isolation and subjective changes from perceived unmet social needs. Here, we review evidence for the conserved role played by the oxytocin neurosignalling system via its modulation of social decision-making and stress management. We discuss how oxytocin underlies the influence of both objective and subjective changes in social conditions, by featuring prominently in the control of motivational and cognitive functions in conserved brain regions, and eliciting ultimate health outcomes through interactions with other neuroendocrine systems.
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Acknowledgement
This review was conducted as part of KK’s Research Fellowship by the Portuguese Foundation for Science and Technology (Fundação para a Ciência e a Tecnologia - FCT; 2021.01659.CEECIND)and was funded by the FCT grant PTDC/BIA-COM/3068/2020 awarded to RFO.
Key References
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Holt-Lunstad, J., Smith, T. B., & Layton, J. B. (2010). Social relationships and mortality risk: a meta-analytic review. PLoS medicine, 7(7), e1000316. This meta-analytic study provided one of the most comprehensive quantifications of mortality effects from social conditions, including isolation-loneliness and poor social relationships, as compared to other leading lifestyle factors, such as obesity, exercise, alcohol consumption and smoking.
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O’Connell, L. A., & Hofmann, H. A. (2012) Evolution of a vertebrate social decision-making network. Science, 336(6085), 1154–1157. This hallmark study put forward compelling support for the evolutionary conservation of a vertebrate network of social behaviour, reward and relay brain areas, and quantified the level of conservation of signalling neuropeptide and endocrine systems across this network, enforcing the fundamental role of oxytocin signalling by the maintenance of oxytocin receptors.
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Capitanio, J. P., Cacioppo, S., & Cole, S. W. (2019). Loneliness in monkeys: neuroimmune mechanisms. Current opinion in behavioural sciences, 28, 51–57. This was the first study to provide both a behavioural paradigm for inducing perceived loneliness in non-human animals, based on individual sociality levels and reciprocity from others, and how this influences immune function and associated stress-physiology, as well as susceptibility to a real-life immune challenge.
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Lee, C. R., Chen, A., & Tye, K. M. (2021). The neural circuitry of social homeostasis: Consequences of acute versus chronic social isolation. Cell, 184(6), 1500–1516. This is a recent and compelling review offering a new social homeostasis framework for approaching the study of neuroendocrine mechanisms of social isolation stress, enabling the assessment of duration-based shifts and the identification of implicated components across a three-tier structure from detectors, to a command centre and ultimately an effector system.
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Kareklas, K., Oliveira, R.F. (2024). Oxytocin and Social Isolation: Nonapeptide Regulation of Social Homeostasis. In: Caldwell, H.K., Albers, H.E. (eds) Neuroendocrinology of Behavior and Emotions. Masterclass in Neuroendocrinology, vol 16. Springer, Cham. https://doi.org/10.1007/978-3-031-51112-7_8
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