Degradation of tumour stromal hyaluronan by small extracellular vesicle-PH20 stimulates CD103⁺ dendritic cells and in combination with PD-L1 blockade boosts anti-tumour immunity.

ABSTRACT: Highly accumulated hyaluronan (HA) not only provides a physiological barrier but also supports an immune-suppressive tumour microenvironment. High-molecular-weight (HMW)-HA inhibits the activation of immune cells and their access into tumour tissues, whereas, low-molecular-weight oligo-HA is known to potentially activate dendritic cells (DCs). In this paper, we investigated whether small extracellular vesicle (EVs)-PH20 hyaluronidase induces tumour HA degradation, which, in turn, activates DCs to promote anti-cancer immune responses. Informed by our previous work, we used a small EV carrying GPI-anchored PH20 hyaluronidase (Exo-PH20) that could deeply penetrate into tumour foci via HA degradation. We found that Exo-PH20-treatment successfully activates the maturation and migration of DCs <

SUBMITTER: Hong Y 

PROVIDER: S-EPMC6781230 | biostudies-literature | 2019

REPOSITORIES: biostudies-literature