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Lipid-accumulated reactive astrocytes promote seizure activity in epilepsy [KA and APOE]

ABSTRACT: Lipid-accumulated reactive astrocytes promote seizure activity in epilepsy [KA and APOE]

PROVIDER: PRJNA931322 | ENA |

REPOSITORIES: ENA

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			Action	DRS
	SRR23335528_1.fastq.gz	Fastqsanger.gz
	SRR23335528_2.fastq.gz	Fastqsanger.gz
	SRR23335529_1.fastq.gz	Fastqsanger.gz
	SRR23335529_2.fastq.gz	Fastqsanger.gz
	SRR23335530_1.fastq.gz	Fastqsanger.gz

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Lipid-accumulated reactive astrocytes promote seizure activity in epilepsy [KA and APOE]

Project description:Abnormal lipid accumulation have been reported in patients with temporal lobe epilepsy (TLE) by in vivo magnetic resonance imaging (MRI). However, the role of astrocytes in the regulation of neuronal activity or lipid metabolism in epilepsy is unclear. Using single-nucleus RNA sequencing of TLE patient samples, we found lipid accumulation and lipid metabolism dysfunction mainly take place in astrocytes. Mechanistic studies revealed that apolipoprotein E (APOE) mediates lipid transfer from hyperactive neurons to astrocytes, turning them into the neurotoxic reactive phenotype

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Transcriptome Profiling of Hippocampal CA1 After Early Life Seizure-Induced Preconditioning May Elucidate New Genetic Therapies for Epilepsy

Project description:Injury of the CA1 subregion induced by a single injection of kainic acid (1×KA) is attenuated when juvenile animals (P20) have a history of two sustained neonatal seizures on P6 and P9. To identify gene candidates involved in the spatially protective effects produced by early life conditioning seizures, we profiled and compared the transcriptomes of CA1 subregions from control, 1×KA, and 3×KA treated animals. More genes were regulated following 3×KA (9.6%) than after 1×KA (7.1%). Following 1×KA, genes supporting oxidative stress, growth, development, inflammation, and neurotransmission were upregulated (e.g., Cacng1, Nadsyn1, Kcng1, Aven, S100a4, GFAP, Vim, Hrsp12, Grik1). After 3×KA, protective genes were differentially over-expressed (e.g., Cat, Gpx7, GAD1, Hspa12A, Foxn1, adenosine A1 receptor, Ca2+ adaptor and homeostatic proteins, Cacnb4, Atp2b2, anti-apoptotic Bcl-2 gene members, intracellular trafficking protein, Grasp, suppressor of cytokine signaling (Socs3)). Distinct anti-inflammatory interleukins not observed in adult tissues (e.g., IL6 transducer, IL23 and IL33 or their receptors (ILF2)) were also over-expressed. Several transcripts were validated by real-time polymerase chain reaction (QPCR) and immunohistochemistry. QPCR showed that casp 6 was increased after 1×KA but reduced after 3×KA; pro-inflammatory gene cox1 was either upregulated or unchanged after 1×KA but reduced by ~70% after 3×KA. Enhanced GFAP immunostaining following 1×KA was selectively attenuated in the CA1 subregion after 3×KA. The observed differential transcriptional responses may contribute to early life seizure-induced pre-conditioning and neuroprotection by reducing glutamate receptor-mediated Ca2+ permeability of the hippocampus and redirecting inflammatory and apoptotic pathways which could lead to new genetic therapies for epilepsy.

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