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Improved outcome of contusive spinal cord injury in Bmal1-/- mice is associated with protection of the blood spinal cord barrier

ABSTRACT: Improved outcome of contusive spinal cord injury in Bmal1-/- mice is associated with protection of the blood spinal cord barrier

PROVIDER: PRJNA636885 | ENA |

REPOSITORIES: ENA

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			Action	DRS
	SRR11911192.fastq.gz	Fastqsanger.gz
	SRR11911193.fastq.gz	Fastqsanger.gz
	SRR11911194.fastq.gz	Fastqsanger.gz
	SRR11911195.fastq.gz	Fastqsanger.gz
	SRR11911196.fastq.gz	Fastqsanger.gz

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Improved outcome of contusive spinal cord injury in Bmal1-/- mice is associated with protection of the blood spinal cord barrier

Project description:The purpose of the study is to understand the role of Bmal1 in spinal cord contusion.

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Project description:Adult zebrafish have the ability to recover from spinal cord injury and exhibit re-growth of descending axons from the brainstem to the spinal cord. We performed gene expression analysis using microarray to find damage-induced genes after spinal cord injury, which shows that Sox11b mRNA is up-regulated at 11 days after injury. However, the functional relevance of Sox11b for regeneration is not known. Here, we report that the up-regulation of Sox11b mRNA after spinal cord injury is mainly localized in ependymal cells lining the central canal and in newly differentiating neuronal precursors or immature neurons. Using an in vivo morpholino-based gene knockout approach, we demonstrate that Sox11b is essential for locomotor recovery after spinal cord injury. In the injured spinal cord, expression of the neural stem cell associated gene, Nestin, and the proneural gene Ascl1a (Mash1a), which are involved in the self-renewal and cell fate specification of endogenous neural stem cells, respectively, is regulated by Sox11b. Our data indicate that Sox11b promotes neuronal determination of endogenous stem cells and regenerative neurogenesis after spinal cord injury in the adult zebrafish. Enhancing Sox11b expression to promote proliferation and neurogenic determination of endogenous neural stem cells after injury may be a promising strategy in restorative therapy after spinal cord injury in mammals. Spinal cord injury or control sham injury was performed on adult zebrafish. After 4, 12, or 264 hrs, a 5 mm segment of spinal cord was dissected and processed (as a pool from 5 animals) in three replicate groups for each time point and treatment.

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Project description:Label-free mass spectrometry-based quantitative proteomics was applied to a larval zebrafish spinal cord injury model, which allows axon regeneration and functional recovery within two days (days post lesion; dpl) after a spinal cord transection in 3 day-old larvae (dpf). Proteomic profiling of the lesion site was performed at 1 dpl and 2 dpl as well as corresponding age-matched unlesioned control tissue (4 dpf as control for 1 dpl; 5 dpf as control for 2 dpl).

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Harnessing developmental dynamics of spinal cord extracellular matrix improves regenerative potential of spinal cord organoids

Project description:Neonatal spinal cord tissues exhibit remarkable regenerative capabilities as compared to adult spinal cord tissues after injury, but the role of extracellular matrix (ECM) in this process has remained elusive. Here, we found that early developmental spinal cord had higher levels of ECMproteins associated with neural development and axon growth, but fewer inhibitory proteoglycans, compared to those of adult spinal cord. Decellularized spinal cord ECM from neonatal (DNSCM) and adult (DASCM) rabbits preserved these differences. DNSCM promoted proliferation, migration, and neuronal differentiation of neural progenitor cells (NPCs) and facilitated axonal outgrowth and regeneration of spinal cord organoids more effectively than DASCM. Pleiotrophin (PTN) and Tenascin (TNC) inDNSCMwere identified as contributors tothese abilities. Furthermore,DNSCMdemonstrated superior performance as a delivery vehicle forNPCs and organoids in spinal cord injury (SCI)models. This suggests that ECMcues from early development stages might significantly contribute to the prominent regeneration ability in spinal cord.

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