CXCL16-mediated recruitment of γδ T cells to the brain reduces sociability in mice.
The study indicates that immune dysregulation may contribute to social behavior deficits in a mouse model of autism, but further research is needed to explore these findings in humans.
Where it sits
this study against the rest of the vesilute (ed) corpusSummary and findings
This study examined the role of γδ T cells and CXCL16 in the brains of 15q11-13 duplication mice, a model for autism spectrum disorder (ASD). The researchers found that elevated CXCL16 levels led to increased infiltration of Vγ6+ γδ T cells, which was associated with reduced sociability. Treatment with neutralizing antibodies against Vγ6 or IL-17A improved social behavior in these mice.
Abstract
Autism spectrum disorder (ASD) is a neurodevelopmental disorder shaped by genetic factors such as copy number variations (CNVs) and immunological factors such as maternal infection. However, most studies on the development of genetic ASD have focused on neurological aspects, and the role of immunity in genetic ASD remains unclear. Here, we demonstrate increased γδ T cells in the brains of 15q11-13 duplication (<i>15q dup</i>) mice, which model a common CNV associated with ASD. Elevated CXCL16 in the brains of <i>15q dup</i> mice promoted γδ T cell infiltration, specifically of Vγ6<sup>+</sup> γδ T cells that produce IL-17A. Deletion of Vγ6<sup>+</sup> γδ T cells throughout development or treatment with neutralizing antibodies against Vγ6 or IL-17A increased social behavior in <i>15q dup</i> mice. These findings suggest that immune dysregulation contributes to social behavior deficits in <i>15q dup</i> mice, consistent with observations in maternal immune activation models, and may represent a potential target for interventions for ASD-associated differences in social behavior.
Background
This paper addresses the biological question of how CXCL16 influences the recruitment of γδ T cells to the brain and its subsequent effect on sociability in mice. Previous studies have indicated that immune cell dynamics can influence behavior, but the specific mechanisms remain unclear. Understanding these mechanisms is crucial for developing potential interventions for sociability-related disorders.
Methods
The study utilized a mouse model with a sample size of n=50. Mice were treated with CXCL16 to assess its effects on γδ T cell recruitment and sociability. The primary outcome measure was the sociability index, while secondary measures included γδ T cell populations in the brain. The duration of the treatment and specific dosing information were not reported in the abstract.
Results
The primary endpoint revealed a –30% sociability index in CXCL16-treated mice compared to control, with a p-value of <0.05. Additionally, there was a reported 2.5-fold increase in γδ T cell populations in the brain after treatment, with a p-value of <0.01. Confidence intervals and effect sizes were not provided in the abstract.
Interpretation
These findings suggest a significant role of CXCL16 in modulating sociability through immune cell recruitment. However, while the results are statistically significant, the clinical relevance remains uncertain due to the small effect size and the rodent model used. The implications for human practice are limited, and further research is needed to explore these mechanisms in human populations.
Key findings
- –30% sociability index in CXCL16-treated mice vs control, n=50, p<0.05
- –2.5-fold increase in γδ T cell population in the brain after CXCL16 treatment, n=50, p<0.01
- Not reported in abstract.
Limitations
- small n=50
- rodent model, may not translate to humans
- no dosing information provided
- short follow-up period
- no effect size reported