Prefrontal microglia deficiency during adolescence disrupts adult cognitive functions and synaptic structures: A follow-up study in female mice

Arx, Anina S. von; Dawson, Kara; Lin, Han-Yu; Mattei, Daniele; Notter, Tina; Meyer, Urs; Schalbetter, Sina M.

doi:10.1016/j.bbi.2023.04.007

Cited by 2 publications

(1 citation statement)

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“…This intricate synaptic refinement mechanism is facilitated by microglia, the brain's innate immune cells, playing a pivotal role in sculpting the maturing PFC (Mallya et al., 2019 ; Schalbetter et al., 2022 ). The orchestration of this process relies on intricate regulatory pathways that encompass both permissive and repulsive growth signals, governing the molecular signaling cascades underpinning synaptic maturation (Arx et al., 2023 ; Jay et al., 2019 ; Tagliatti et al., 2024 ). Central to these mechanisms is the tumor necrosis factor alpha‐converting enzyme/a disintegrin and metalloproteinase 17 (TACE/ADAM17), a key sheddase responsible for cleaving various growth factors and inflammatory mediators (Zhang et al., 2016 ).…”

Section: Introductionmentioning

confidence: 99%

Role of the prefrontal cortical protease TACE/ADAM17 in neurobehavioral responses to chronic stress during adolescence

Sharafeddin,

Sierra,

Ghaly

et al. 2024

Brain and Behavior

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IntroductionChronic adolescent stress profoundly affects prefrontal cortical networks regulating top‐down behavior control. However, the neurobiological pathways contributing to stress‐induced alterations in the brain and behavior remain largely unknown. Chronic stress influences brain growth factors and immune responses, which may, in turn, disrupt the maturation and function of prefrontal cortical networks. The tumor necrosis factor alpha‐converting enzyme/a disintegrin and metalloproteinase 17 (TACE/ADAM17) is a sheddase with essential functions in brain maturation, behavior, and inflammatory responses. This study aimed to determine the impact of stress on the prefrontal cortex and whether TACE/ADAM17 plays a role in these responses.MethodsWe used a Lewis rat model that incorporates critical elements of chronic psychosocial stress, such as uncontrollability, unpredictability, lack of social support, and re‐experiencing of trauma.ResultsChronic stress during adolescence reduced the acoustic startle reflex and social interactions while increasing extracellular free water content and TACE/ADAM17 mRNA levels in the medial prefrontal cortex. Chronic stress altered various ethological behavioral domains in the observation home cages (decreased ingestive behaviors and increased walking, grooming, and rearing behaviors). A group of rats was injected intracerebrally either with a novel Accell™ SMARTpool TACE/ADAM17 siRNA or a corresponding siRNA vehicle (control). The RNAscope Multiplex Fluorescent v2 Assay was used to visualize mRNA expression. Automated puncta quantification and analyses demonstrated that TACE/ADAM17 siRNA administration reduced TACE/ADAM17 mRNA levels in the medial prefrontal cortex (59% reduction relative to control). We found that the rats that received prefrontal cortical TACE/ADAM17 siRNA administration exhibited altered eating patterns (e.g., increased food intake and time in the feeding zone during the light cycle).ConclusionThis study supports that the prefrontal cortex is sensitive to adolescent chronic stress and suggests that TACE/ADAM17 may be involved in the brain responses to stress.

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