Mechanically matching the rheological properties of brain tissue for drug-delivery in human glioblastoma models

Peptide functionalized hyaluronic acid (HA(CF)) cross-linked by cucurbit[8]uril (CB[8]), a new class of drugdelivery reservoirs, is used to enable improved drug bioavailability for glioblastoma tumors in patient-derived xenograft (PDX) models. The mechanical and viscoelastic properties of native human and mouse tissues are measured over 8 h via oscillatory rheology under physiological conditions. Treatment with drug-loaded hydrogels allowed for a significant survival impact of 45 % (55.5-80.5 days). A relationship between the type of PDX tumor formed-a consequence of the heterogeneic nature of GB tumors-and changes in the initial survival is observed owing to greater local pressure from stiffer tumors. These biocompatible and tailorable materials warrant use as drug delivery reservoirs in PDX resection models, where the mechanical properties can be readily adjusted to match the stiffness of local tissue and thus have potential to improve the survival of GB patients.

Automated summary

The study utilized a new class of drug delivery reservoirs to improve drug bioavailability for glioblastoma tumors, measured the mechanical properties of human and mouse tissues, and found that treatment with drug-loaded hydrogels significantly increased survival impact. Additionally, a correlation between tumor type formed and initial survival was observed due to the heterogeneity of GB tumors.