Bio-polymeric transferrin-targeted temozolomide nanoparticles in gel for synergistic post-surgical GBM therapy.

ABSTRACT

Spatiotemporal targeting of anti-glioma drugs remains a pressing issue in glioblastoma (GBM) treatment. We challenge this issue by developing a minimally invasive in situ implantable hydrogel implant comprising transferrin-targeted temozolomide-miltefosine nanovesicles in the surgically resected GBM cavity (tumour bed). Injection of the "nanovesicle in hydrogel system" in orthotopic GBM-bearing mice improved drug penetration into the peri-cavitary region (∼4.5 mm in depth) with the potential to act as a bridge therapy in the immediate postoperative period, before the initiation of adjuvant radiotherapy. The controlled and sustained release of temozolomide over a month in the surgical cavity eradicated the microscopic GBM cells present within the tumour bed, thereby augmenting the efficacy of adjuvant therapy. The drug (temozolomide and miltefosine) combination was tolerable and efficiently inhibited tumour growth, causing significant prolongation of the survival of tumour-bearing mice compared to that with the free drug. Direct implantation at the target site in the brain resulted in spatiotemporal anti-glioma activity with minimal extracranial and systemic distribution. Nanovesicle in flexible hydrogel systems can be used as potential platforms for the post-surgical management of GBM before initiating adjuvant radiation therapy.