The invention relates to the technical field of biological
medicine, in particular to a preparation method and application of a function-enhanced
mesenchymal stem cell exosome, the preparation method comprises the following steps: S1, preparing an NK
cell exosome, collecting supernate in an NK
cell culture medium, and treating the supernate by using an optimized
exosome separation and purification process to obtain an NK
cell exosome; finishing preparation of a
stock solution; s2, culturing the mesenchymal stem cells, culturing the cells in a 3D
suspension culture mode, treating and controlling
low oxygen concentration by combining with NK cell exosomes, and simulating an in-vivo
inflammation microenvironment in a multi-
azimuth manner, so that the exosomes secreted by the mesenchymal stem cells have a stronger
immune regulation function and an anti-inflammatory effect; s3, preparation of
mesenchymal stem cell exosomes: preparing a
stock solution through an exosome separation and purification process combining a tangential flow
ultrafiltration technology and a PS
affinity chromatography technology; the exosome
stock solution obtained by the method is high in purity and high in yield, and has more excellent
biological activity and excellent
treatment effect.