Tremella polysaccharide microneedles loaded with magnetic dental pulp stem cell intracellular vesicles used for androgenic alopecia.

Background: Mesenchymal stem cell exosomes are the most extensively researched type of Extracellular vesicles (EVs) that offer novel avenues for hair regeneration. However, their use in the field of hair regeneration was limited by their poor production of exosomes. It has been discovered that intracellular vesicles (IVs), which are produced at a higher rate than exosomes, play a comparable biological purpose. As a result, we developed HTMI-MN, a microneedle that uses tremella, a type of Tremella polysaccharide (TPS), and hyaluronic acid (HA) as matrix materials. It has magnetic intracellular vesicles (Mag-IVs), which work in concert to treat androgenic alopecia (AGA) and encourage hair growth.

Methods: After characterization of the Mag-IVs, we evaluated the effect on angiogenesis by scratch assay, angiogenesis assay, Western Blot and ELISA assay. In addition, we tested the protective effect of Human hair papillary cells (HHDPCs) by CCK-8 method, Western Blot and flow cytometry. Finally, the effects of tremella polysaccharide on M1/M2 polarization of macrophages were detected by fluorescence staining, Western Blot and flow cytometry. AGA model was established in vivo by DHT, and treatment was given by microneedle injection.

Results: Our study found that Mag-IVs have greater power to promote angiogenesis and protect HHDPCs from apoptosis compared to other vesicles. Besides, tremella polysaccharide can make the transformation of macrophages to anti-inflammatory phenotype. Taken together, in vivo experiments showed that hair regeneration was faster in HTMI-MN-treated mice.

Conclusion: These results indicate that Mag-IVs and tremella polysaccharide can synergistically improve the hair microenvironment, which has a promising future for AGA treatment.