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Distal chromosome 6q harbors a haploinsufficient tumor suppressor gene that regulates PI3K signaling in glioblastoma

ABSTRACT: Glioblastoma is a universally fatal disease characterized by remarkable molecular heterogeneity. Prognostic biomarkers in glioblastoma have implications for patient management and drug development but are currently limited. In this study, we analyzed exome-wide human glioblastoma somatic copy number alteration data and discovered cytoband 6q27 as an independent poor prognostic marker across multiple glioblastoma datasets. We then combined CRISPR-Cas9 data, human spatial transcriptomic data, and human and mouse RNA sequencing data to nominate PDE10A as a potential haploinsufficient tumor suppressor in the 6q27 region. Mouse glioblastoma modeling using the RCAS/tv-a system confirmed that Pde10a suppression induced an aggressive glioma phenotype in vivo. Cell culture analysis showed that decreased Pde10a expression led to increased Pi3k/Akt signaling, a response blocked by selective Pi3k inhibitors. Single nucleus RNA sequencing from our mouse gliomas in vivo, in combination with cell culture validation showed that Pde10a suppression was associated with a proneural to a mesenchymal transition that exhibited increased cell adhesion and decreased cell migration. PDE10A loss was associated with unmethylated MGMT promoter status in human glioblastoma and resistance to temozolomide and radiation therapy in vitro. Our results indicate that patients with glioblastoma harboring PDE10A loss have worse outcomes, increased resistance to standard-of-care therapy, and potentially increased sensitivity to PI3K inhibition.

ORGANISM(S): Mus musculus

PROVIDER: GSE243575 | GEO | 2024/09/19

REPOSITORIES: GEO

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Project description:Inhibition of phosphodiesterase 10A (PDE10A) promotes cyclic nucleotide signaling, increases striatal activation, and decreases behavioral activity. Enhanced cyclic nucleotide signaling is a well established route to producing changes in gene expression. We hypothesized that chronic suppression of PDE10A activity would have significant effects on gene expression in the striatum. A comparison of the expression profile of PDE10A knockout (KO) mice and wild-type mice after chronic PDE10A inhibition revealed altered expression of 19 overlapping genes with few significant changes outside the striatum or after administration of a PDE10A inhibitor to KO animals. Chronic inhibition of PDE10A produced up-regulation of mRNAs encoding genes that included prodynorphin, synaptotagmin10, phosphodiesterase 1C, glutamate decarboxylase 1, and diacylglycerol O-acyltransferase and a down-regulation of mRNAs encoding choline acetyltransferase and Kv1.6, suggesting long-term suppression of the PDE10A enzyme is consistent with altered striatal excitability and potential utility as a antipsychotic therapy. In addition, up-regulation of mRNAs encoding histone 3 (H3) and down-regulation of histone deacetylase 4, follistatin, and claspin mRNAs suggests activation of molecular cascades capable of neuroprotection. We used lentiviral delivery of cAMP response element (CRE)-luciferase reporter constructs into the striatum and live animal imaging of 2-{4-[-pyridin-4-yl-1-(2,2,2-trifluoro-ethyl)-1H-pyrazol-3-yl]-phenoxymethyl}-quinoline succinic acid (TP-10)-induced luciferase activity to further demonstrate PDE10 inhibition results in CRE-mediated transcription. Consistent with potential neuroprotective cascades, we also demonstrate phosphorylation of mitogen- and stress-activated kinase 1 and H3 in vivo after TP-10 treatment. The observed changes in signaling and gene expression are predicted to provide neuroprotective effects in models of Huntington's disease. n=4-6 per group. WT mice used as a control for PDE10A KO mice, vehicle control for PDE10A inhibitor treatment.