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• W3138839669 abstract "Fragile X syndrome (FXS) is the leading monogenic cause of intellectual disability and autism spectrum disorders. With increasing investigation into the molecular mechanisms underlying FXS, there is growing evidence that perturbations in glial signaling are widely associated with neurological pathology. Purinergic signaling, which utilizes nucleoside triphosphates as signaling molecules, provides one of the most ubiquitous signaling systems for glial-neuronal and glial-glial crosstalk. Here, we sought to identify whether purinergic signaling is dysregulated within the FXS mouse cortex, and whether this dysregulation contributes to aberrant intercellular communication. In primary astrocyte cultures derived from the Fmr1 knockout (KO) mouse model of FXS, we found that application of exogenous ATP and UTP evoked elevated intracellular calcium responses compared to wildtype levels. Accordingly, purinergic P2Y2 and P2Y6 receptor expression was increased in Fmr1 KO astrocytes both in vitro and in acutely dissociated tissue, while P2Y antagonism via suramin prevented intracellular calcium elevations, suggesting a role for these receptors in aberrant FXS astrocyte activation. To investigate the impact of elevated purinergic signaling on astrocyte-mediated synaptogenesis, we quantified synaptogenic protein TSP-1, known to be regulated by P2Y activation. TSP-1 secretion and expression were both heightened in Fmr1 KO vs wildtype astrocytes following UTP application, while naïve TSP-1 cortical expression was also transiently elevated in vivo, indicating increased potential for excitatory TSP-1-mediated synaptogenesis in the FXS cortex. Together, our results demonstrate novel and significant purinergic signaling elevations in Fmr1 KO astrocytes, which may serve as a potential therapeutic target to mitigate the signaling aberrations observed in FXS." @default.
• W3138839669 created "2021-03-29" @default.
• W3138839669 creator A5024005856 @default.
• W3138839669 creator A5049109562 @default.
• W3138839669 creator A5088213319 @default.
• W3138839669 date "2021-03-22" @default.
• W3138839669 modified "2023-10-02" @default.
• W3138839669 title "Astrocyte‐mediated purinergic signaling is upregulated in a mouse model of Fragile X syndrome" @default.
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• W3138839669 doi "https://doi.org/10.1002/glia.23997" @default.
• W3138839669 hasPubMedId "https://pubmed.ncbi.nlm.nih.gov/33754385" @default.
• W3138839669 hasPublicationYear "2021" @default.
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