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Structured wound angiogenesis instructs mesenchymal barrier compartments in the regenerating nerve [scRNASeq_Cdh5]

ABSTRACT: Organ injury stimulates the formation of new capillaries to restore blood supply raising questions about the potential contribution of neoangiogenic vessel architecture to the healing process. With single-cell mapping we resolved the properties of endothelial cells that organize a polarized scaffold at the repair site of lesioned peripheral nerves. Transient reactivation of an embryonic guidance program is required to orient neovessels across the wound. Manipulation of this structured angiogenic response through genetic and pharmacological targeting of Plexin-D1/VEGF pathways within an early window of repair has long-term impact on configuration of the nerve stroma. Neovessels direct nerve-resident mesenchymal cells to mold a provisionary fibrotic scar by assembling an orderly system of stable barrier compartments that channel regenerating nerve fibers and shield them from the persistently leaky vasculature. Thus, guided and balanced repair angiogenesis enables the construction of a “bridge” microenvironment conducive for axon regrowth and homeostasis of the regenerated tissue.

ORGANISM(S): Mus musculus

PROVIDER: GSE233357 | GEO | 2023/11/21

REPOSITORIES: GEO

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Structured wound angiogenesis instructs mesenchymal barrier compartments in the regenerating nerve [scRNASeq_Pdgfrb]

Project description:Organ injury stimulates the formation of new capillaries to restore blood supply raising questions about the potential contribution of neoangiogenic vessel architecture to the healing process. With single-cell mapping we resolved the properties of endothelial cells that organize a polarized scaffold at the repair site of lesioned peripheral nerves. Transient reactivation of an embryonic guidance program is required to orient neovessels across the wound. Manipulation of this structured angiogenic response through genetic and pharmacological targeting of Plexin-D1/VEGF pathways within an early window of repair has long-term impact on configuration of the nerve stroma. Neovessels direct nerve-resident mesenchymal cells to mold a provisionary fibrotic scar by assembling an orderly system of stable barrier compartments that channel regenerating nerve fibers and shield them from the persistently leaky vasculature. Thus, guided and balanced repair angiogenesis enables the construction of a “bridge” microenvironment conducive for axon regrowth and homeostasis of the regenerated tissue.

2023-11-21 | GSE233359 | GEO

Structured wound angiogenesis instructs mesenchymal barrier compartments in the regenerating nerve [bulkRNASeq]

2023-11-21 | GSE233355 | GEO

Microglia and macrophages promote corralling, wound compaction and recovery in spinal cord injury via Plexin-B2

Project description:Tissue repair after spinal cord injury (SCI) requires mobilization of immune and glial cells to form a protective barrier that seals the wound and facilitates debris clearing, inflammatory containment, and matrix compaction. This process involves corralling, wherein phagocytic immune cells become confined to the necrotic core surrounded by an astrocytic border. Here, we elucidate a temporally distinct gene signature in injury-activated microglia/macrophages (IAM), which engages axon guidance pathways. Plexin-B2 is upregulated in IAM, which is required for motosensory recovery after SCI. Plexin-B2 deletion in myeloid cells impairs corralling, leading to diffuse tissue damage, inflammatory spillover, and hampered axon regeneration. Corralling begins early and requires Plexin-B2 in both microglia and macrophages. Mechanistically, Plexin-B2 promotes microglia motility, steers IAM away from colliding cells, and facilitates matrix compaction. Our data thus establish Plexin-B2 as an important link that integrates biochemical cues and physical interactions of IAM with the injury microenvironment during wound healing.

2019-12-23 | GSE113566 | GEO

Changes in the coding/non-coding transcriptome and DNA methylome that define the Schwann cell repair phenotype after nerve injury

Project description:Schwann cell (Büngner) repair cells play a critical role in orchestrating nerve repair after injury, but the reprogramming process that generates them is poorly understood. We present the first combined whole genome coding and non-coding RNA and CpG methylation study after nerve injury. We show that genes involved in epithelial to mesenchymal transition are enriched in repair cells and we identify long non-coding RNAs in Schwann cells. We demonstrate that the AP-1 transcription factor c-Jun regulates the expression of certain micro RNAs in repair cells, in particular miR-21 and miR-34. Surprisingly, changes in CpG methylation are limited in injury, unlike development, and restricted to specific locations, such as enhancer regions of novel Schwann cell specific genes, such as Nedd4l, and near to local enrichment of AP-1 motifs. These epigenetic changes significantly broaden our understanding of Schwann cell reprogramming in peripheral nervous system tissue repair. To identify epigenetic regulators underlying successful nerve regeneration we generated RNA-Seq, small-RNA-Seq and whole genome bisulfite sequencing libraries for uninjured nerve versus three and/or seven day post nerve transection sciatic nerves of adult C57BL/6J mice crush.

2017-08-30 | E-MTAB-5633 | biostudies-arrayexpress

Transcription profiling of rat retina after IONT and IONC - time series

Project description:retinal ganglion cells die after optic nerve injury, either crush or transection. The molecular causesunderlying this degeneration are largely unkwon; the purpose of this job is to find which (if any) gene regulation triggers RGC death with the final goal of design neuroprotective protocols Experiment Overall Design: 3 groups: naive, IONT (intraorbital nerve transection) IONC (intraorbital nerve crush). IONT and IONC lesioned animals were kept the appropriate times postlesion (12h,. 24h, 48h, 3d, 7d, and 15d). For each time point 8-12 animals were used. RNA from 4 animals was pooled and extracted to hybridaze 1 array replica. All replicas were pooled biological replicas: 5 for naive RNA (each replica 4 retinas, therefore 5 independent RNA extractions were done with a total of 20 retinas), IONT: 12h 3 replicas, 24h 2 replicas, 48h 3replicas, 3d 2 replicas, 7d 3 replicas, 15d 2 replicas. IONC: 3 replicas per time point: 12h, 24h, 48h, 3d and 7d)

2008-10-20 | E-GEOD-9918 | biostudies-arrayexpress

Plexin-B2 reduces glioma cell cohesion and regulates glioma-vascular interactions

Project description:The diffuse invasion of glioblastoma (GBM) cells into healthy brain tissue is a main contributor for the high lethality of this most frequent form of malignant brain tumor. Plexins are cell surface receptors for semaphorins and control cell adhesion and cytoskeletal dynamics in development and in adult physiology. Gene expression of Plexin-B2 is upregulated in GBM and correlates with its lethality. We show here that Plexin-B2 activity can reduce the cohesiveness of GBM cells, which facilitates their invasive capacity. Targeted deletion of Plexin-B2 in GBM cells increased their cohesion to each other, revealing that a major function of Plexin-B2 activity is to downregulate cell-cell adhesion, possibly by downregulating other cell adhesion systems. In an in vivo intracranial transplant model, invasion of Plexin-B2 mutant GBM cells was impaired, with cells invading shorter distances. Interestingly, the loss of Plexin-B2 also changed the migration mode of cells, with the balance of cells in brain stroma vs. capillary space shifted: Plexin-B2 mutant cells were more likely to adhere to the vasculature. Our structure-function analyses revealed that the Ras-GAP domain of Plexin-B2 that is the main functional output responsible for the cohesion regulating function of Plexin-B2. Transcriptomic analyses of Plexin-B2 KO cells suggests that Plexin-B2 loss in different GBM cell lines has no direct transcriptional target genes, however, consistently, cell adhesion molecules were changed in expression, suggesting that cells compensate for loss of Plexin-B2. Thus, Plexin-B2 acts as a key regulator of the cohesiveness of GBM cells, thereby facilitating their invasiveness.

2021-01-13 | GSE126658 | GEO

Transcription profiling of rat gastrocneumius muscle following short and long term denervation

Project description:Effect of "Sensory Protection" on the transcriptome of Gastrocnemius muscle denervated by Tibial nerve transection in the rat. Comparison is made between the muscle transcriptome in denervated muscle (D), muscle undergoing surgical repair with a motor nerve (immediate repair, or IR) and muscle undergoing surgical repair with a pure sensory nerve (sensory protection, or SP). There are 6 cohorts of rats with 4 to 6 rats in each cohort:<br><br>1 Month Denervated, 1 Month Immediate Repair, 1 Month Sensory Protection, 3 Month Denervated, 3 Month Immediate Repair, 3 Month Sensory Protection. <br><br>For each animal RNA was extracted from both the experimental operated (right) gastrocnemius muscle and the contralateral control unoperated (left) gastrocnemius. Samples were run in duplicate with fluorophor reversal experiments (i.e experimental limb RNA labelled with Cy3 and control limb RNA labelled with Cy5 and vice versa) to control for possible unequal incorporation of the dyes in the reverse transcription reaction.

2009-04-15 | E-MEXP-1580 | biostudies-arrayexpress

Engineering spatially-confined conduits to tune nerve self-organization and allodynic responses via YAP-mediated mechanotransduction

Project description:Chronic allodynia stemming from peripheral stump neuromas can persist for extended periods, significantly compromising patients’ quality of life. Conventional managements for nerve stumps have demonstrated limited effectiveness in ensuring their orderly termination. In this study, we present a spatially confined conduit strategy, designed to enhance the self-organization of regenerating nerves after truncation. This innovative approach elegantly enables the autonomous slowing of axonal outgrowth in response to the gradually constricting space, concurrently suppressing neuroinflammation through YAP-mediated mechanotransduction activation. Meanwhile, the decelerating axons exhibit excellent alignment and remyelination, thereby helping to prevent failure modes in nerve self-organization, such as axonal twisting in congested regions and overgrowth beyond the conduit's capacity.

2024-11-14 | GSE280040 | GEO

Failures of nerve regeneration caused by aging or chronic denervation are rescued by restoring Schwann cell c-Jun

Project description:After nerve injury, myelin and Remak Schwann cells reprogram to repair cells specialized for regeneration. Normally providing strong regenerative support, these cells fail in aging animals, and during the chronic denervation that results from slow axon growth. This impairs axonal regeneration and causes a significant clinical problem. We find that aging and chronically denervated repair cells express reduced c-Jun protein and the regenerative support provided by these cells is also reduced. In both cases, genetically restoring Schwann cell c-Jun levels restores regeneration to that in controls. We identify potential gene candidates mediating this effect and implicate Shh in the control of Schwann cell c-Jun levels. These experiments reveal that a common mechanism, reduced c-Jun in repair cells, underlies two major reasons for regeneration failure in the PNS. They underscore the central importance of Schwann cell c-Jun as a regulator of nerve repair, and point to molecular pathways that can be manipulated for improving the clinical outcome of nerve injuries.

2020-10-14 | E-MTAB-9640 | biostudies-arrayexpress

Adipo-glial signaling mediates metabolic adaptation in peripheral nerve regeneration

Project description:The peripheral nervous system harbours a remarkable potential to regenerate after acute nerve trauma. Full functional recovery, however, is rare and critically depends on peripheral nerve Schwann cells that orchestrate break down and resynthesis of myelin and, at the same time, support axonal regrowth. How Schwann cells meet the high metabolic demand required for nerve repair remains poorly understood. We here report that nerve injury induces adipocyte to glial signaling, and identify the adipokine leptin as an upstream regulator of glial metabolic adaptation in regeneration. Signal integration by leptin receptors in Schwann cells ensures efficient peripheral nerve repair by adjusting injury-specific catabolic processes in regenerating nerves, including myelin autophagy and mitochondrial respiration. Our findings propose a model according to which acute nerve injury triggers a therapeutically targetable intercellular crosstalk that modulates glial metabolism, to provide sufficient energy for successful nerve repair.

2023-12-12 | GSE244328 | GEO

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