Three-Dimensional-Cultured MSC-Derived Exosome-Hydrogel Hybrid Microneedle Array Patch for Spinal Cord Repair

• DOI: 10.1021/acs.nanolett.2c02259
• Publication Date: 2022-07-25T12:52:47Z
• Authors: Min Han; Hongru Yang; Xiangdong Lu; Yuming Li; Zihao Liu; Feng Li; Zehan Shang; Xiaofeng Wang; Xuze Li; Junliang Li; Hong Liu; Tao Xin
• Keywords: Spinal Cord Regeneration; 0303 health sciences; 03 medical and health sciences; Humans; Hydrogels; Mesenchymal Stem Cells; Exosomes; Spinal Cord Injuries

Exosomes derived from mesenchymal stem cells (MSCs) have been proven to exhibit great potentials in spinal cord injury (SCI) therapy. However, conventional two-dimensional (2D) culture will inevitably lead to the loss of stemness of MSCs, which substantially limits the therapeutic potency of MSCs exosomes (2D-Exo). Exosomes derived from three-dimensional culture (3D-Exo) possess higher therapeutic efficiency which have wide applications in spinal cord therapy. Typically, conventional exosome therapy that relies on local repeated injection results in secondary injury and low efficiency. It is urgent to develop a more reliable, convenient, and effective exosome delivery method to achieve constant in situ exosomes release. Herein, we proposed a controlled 3D-exohydrogel hybrid microneedle array patch to achieve SCI repair in situ. Our studies suggested that MSCs with 3D-culturing could maintain their stemness, and consequently, 3D-Exo effectively reduced SCI-induced inflammation and glial scarring. Thus, it is a promising therapeutic strategy for the treatment of SCI.