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Glioma epileptiform activity and progression are driven by IGSF3 mediated potassium dysregulation [mouse]

ABSTRACT: Seizures are a pathophysiological feature of malignant glioma. Recent studies implicate peritumoral synaptic dysregulation as a driver of neuronal hyperactivity and tumor progression, however, the molecular mechanisms that govern these phenomena remain elusive. Using scRNA-seq and intraoperative patient ECoG recordings, we show that tumors from seizure patients are enriched for gene signatures regulating synapse formation. Employing a human-to-mouse in vivo functionalization pipeline to screen these gene sets, we identified IGSF3 as a mediator of glioma progression and dysregulated neural circuitry in the form of spreading depolarization (SD). Mechanistically, we discovered that IGSF3 interacts with Kir4.1 to suppress potassium buffering and found that seizure patients exhibit reduced expression of potassium handlers in proliferating tumor cells. In vivo imaging revealed dysregulated synaptic activity emanates from the tumor-neuron interface, which we confirmed in patients. Our studies reveal that tumor progression and seizures are enabled by ion dyshomeostasis and identify SD as a driver of disease.

ORGANISM(S): Mus musculus

PROVIDER: GSE221533 | GEO | 2023/01/01

REPOSITORIES: GEO

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Project description:Epilepsy is a common neurological disease, manifested in unprovoked recurrent seizures. Epileptogenesis may develop due to genetic or pharmacological origins or following injury, but it remains unclear how the unaffected brain escapes this susceptibility to seizures. Here, we report that dynamic changes in forebrain microRNA (miR)-211 in the mouse brain shift the threshold for spontaneous and pharmacologically-induced seizures alongside changes in the cholinergic pathway genes, implicating this miR in the avoidance of seizures. We identified miR-211 as a putative attenuator of cholinergic-mediated seizures by intersecting forebrain miR profiles that were Ago-precipitated, synaptic vesicle target-enriched or differentially expressed under pilocarpine-induced seizures, and validated TGFBR2 and the nicotinic anti-inflammatory acetylcholine receptor nAChRa7 as murine and human miR-211 targets, respectively. To explore the link between miR-211 and epilepsy, we engineered dTg-211 mice with doxycycline-suppressible forebrain overexpression of miR-211. These mice reacted to doxycycline exposure by spontaneous electrocorticography-documented non-convulsive seizures, accompanied by forebrain accumulation of the convulsive seizures-mediating miR-134. RNA-sequencing demonstrated in doxycycline-treated dTg-211 cortices over-representation of synaptic activity, Ca2+ transmembrane transport, TGFβR-II signaling and cholinergic synapse pathways. Additionally, a cholinergic dis-regulated mouse model over-expressing a miR-refractory acetylcholinesterase-R splice variant showed a parallel propensity for convulsions, miR-211 decreases and miR-134 elevation. Our findings demonstrate that in mice, dynamic miR-211 decreases induce hyper-synchronization, non-convulsive and convulsive seizures, accompanied by expression changes in cholinergic and TGFBR2 pathways as well as in miR-134. Realizing the importance of miR-211 dynamics opens new venues for translational diagnosis of and interference with epilepsy.

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Glioma epileptiform activity and progression are driven by IGSF3 mediated potassium dysregulation [mouse]

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