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Laser Interstitial Thermal Therapy Enhances Bidirectional Blood-Brain Barrier Permeability in Glioblastoma

ABSTRACT: Laser interstitial thermal therapy (LITT) is a minimally invasive treatment for glioblastoma that increases blood-brain barrier (BBB) permeability. However, the mechanisms and spatiotemporal features of this effect remain unclear. It is also unknown whether LITT promotes release of circulating tumor DNA (ctDNA).Using our previously developed LITT mouse model, we employed single-cell RNA sequencing (scRNAseq) to investigate gene expression changes in endothelial cells following LITT in naïve mouse brain. Brains were also harvested at multiple time points to assess LITT effects on tight junction (TJ) integrity and transcytosis via immunofluorescence and transmission electron microscopy. Human glioblastoma tissues were analyzed to monitor ambient caveolae-mediated transcytosis in tumor regions. Finally, ctDNA levels in mouse plasma were quantified using digital droplet PCR following LITT.LITT triggered downregulation of pathways related to cell-cell junctions and upregulation of transcytosis. LITT transiently disrupted TJ integrity for 7 days up to 100 µm away from the ablation zone. Further, LITT increased caveolae-mediated transcytosis in endothelial cells for 21 days, peaking at 14 days, in part due to suppression of the transcytosis inhibitor Mfsd2a. LITT facilitated ctDNA detection in mouse plasma at 1 hour, 3 days, 7 days, and 14 days post-procedure.Our study demonstrates that LITT transiently disrupts the BBB in the periphery of the ablation with endothelial TJ disruption and transcytosis upregulation following distinct time courses. LITT effects on the BBB are bidirectional and enhance ctDNA release in addition to enabling brain entry of agents.

ORGANISM(S): Mus musculus

PROVIDER: GSE329855 | GEO | 2026/05/04

REPOSITORIES: GEO

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Project description:The blood-brain barrier (BBB) consists of specific physical barriers, enzymes and transporters, which together maintain the necessary extracellular environment of the central nervous system (CNS). The main physical barrier is found in the CNS endothelial cell, and depends on continuous complexes of tight junctions combined with reduced vesicular transport. Other possible constituents of the BBB include extracellular matrix, astrocytes and pericytes, but the relative contribution of these different components to the BBB remains largely unknown. Here we demonstrate a direct role of pericytes at the BBB in vivo. Using a set of adult viable pericyte-deficient mouse mutants we show that pericyte deficiency increases the permeability of the BBB to water and a range of low-molecular-mass and high-molecular-mass tracers. The increased permeability occurs by endothelial transcytosis, a process that is rapidly arrested by the drug imatinib. Furthermore, we show that pericytes function at the BBB in at least two ways: by regulating BBB-specific gene expression patterns in endothelial cells, and by inducing polarization of astrocyte end-feet surrounding CNS blood vessels. Our results indicate a novel and critical role for pericytes in the integration of endothelial and astrocyte functions at the neurovascular unit, and in the regulation of the BBB. The brain microvascular fragments were isolated from mice with different genotypes, each represented by 3-4 biological replicates. Genotypes 1-2: Platelet derived growth factor-B (PDGF-B) retention-motif knockout (pdgfbret/ret) represent the pericyte-deficient situation, and the heterozygous mice (pdgfbret/+) are used as controls. Genotypes 3-4: Hypomorphic PDGF-B mutants that rescue pdgfb-/- null mice, in which a one copy of a conditionally silent human PDGF-B transgene targeted to the Rosa 26 locus (R26P) is turned on by endothelial-specific expression of Cre recombinase. In this data set these mice are named as Tie2Cre, R26P+/0, pdgfb-/- (representing the pericyte-deficient situation). Mice wt for pdgfb (pdgfb+/+) and carrying one silent copy of R26P (R26P+/0), are used as controls. Genotype 5: Adult Notch3+/+ wildtype (WT).

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Laser Interstitial Thermal Therapy Enhances Bidirectional Blood-Brain Barrier Permeability in Glioblastoma

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