4.8 Article

A 3D Fiber-Hydrogel Based Non-Viral Gene Delivery Platform Reveals that microRNAs Promote Axon Regeneration and Enhance Functional Recovery Following Spinal Cord Injury

期刊

ADVANCED SCIENCE
卷 8, 期 15, 页码 -

出版社

WILEY
DOI: 10.1002/advs.202100805

关键词

electrospinning; hydrogel; neural tissue engineering; RNA interference; RNA sequencing

资金

  1. National Research Foundation, Singapore [NRF2019-THE002-0001]
  2. NMRC-CBRG grant [NMRC/CBRG/0096/2015]
  3. MOE [RG38/19, RG37/20]
  4. NTU

向作者/读者索取更多资源

A novel therapeutic approach for spinal cord injuries involving scaffold-mediated Axon miR treatment with methylprednisolone significantly enhances axon regeneration and functional recovery, while reducing inflammation gene expression.
Current treatment approaches toward spinal cord injuries (SCI) have mainly focused on overcoming the inhibitory microenvironment that surrounds lesion sites. Unfortunately, the mere modulation of the cell/tissue microenvironment is often insufficient to achieve desired functional recovery. Therefore, stimulating the intrinsic growth ability of injured neurons becomes crucial. MicroRNAs (miRs) play significant roles during axon regeneration by regulating local protein synthesis at growth cones. However, one challenge of using miRs to treat SCI is the lack of efficient delivery approaches. Here, a 3D fiber-hydrogel scaffold is introduced which can be directly implanted into a spinal cord transected rat. This 3D scaffold consists of aligned electrospun fibers which provide topographical cues to direct axon regeneration, and collagen matrix which enables a sustained delivery of miRs. Correspondingly, treatment with Axon miRs (i.e., a cocktail of miR-132/miR-222/miR-431) significantly enhances axon regeneration. Moreover, administration of Axon miRs along with anti-inflammatory drug, methylprednisolone, synergistically enhances functional recovery. Additionally, this combined treatment also decreases the expression of pro-inflammatory genes and enhance gene expressions related to extracellular matrix deposition. Finally, increased Axon miRs dosage with methylprednisolone, significantly promotes functional recovery and remyelination. Altogether, scaffold-mediated Axon miR treatment with methylprednisolone is a promising therapeutic approach for SCI.

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