Intratumoral injection of thermogelling and sustained-release carboplatin-loaded hydrogel simplifies the administration and remains the synergistic effect with radiotherapy for mice gliomas

Biomaterials. 2018 Jan:151:38-52. doi: 10.1016/j.biomaterials.2017.10.015. Epub 2017 Oct 9.

Abstract

Background: Carboplatin, an antineoplastic agent, binds DNA and enhances radiotherapy (RT) effects. Carboplatin-loaded hydrogel (oxidized hyaluronic acid/adipic acid dihydrazide) enables the sustained drug release and facilitates the synergistic effect with RT.

Purpose: We investigated the effectiveness and convenience of hydrogel carboplatin combined with RT for mice glioma.

Materials and methods: Mouse glioma cells (ALTS1C1) were subcutaneously implanted in the right thigh of C57BL/6 mice on Day 0. The mice were categorized by treatments: sham, hydrogel, hydrogel carboplatin, aqueous carboplatin, RT, hydrogel carboplatin/RT, and aqueous carboplatin/RT. Hydrogel carboplatin (300 μg single dose on Day 7) or aqueous carboplatin (100 μg daily dose on Days 7, 8, and 9) was administered via intratumoral injection. RT was delivered a daily dose of 10 Gy on Days 8 and 9.

Results: For mice administered hydrogel carboplatin/RT versus those administered aqueous carboplatin/RT, the 24-day tumor growth control rate and 104-day recurrence-free survival rate were 100% and 50% versus 100% and 66.7% (p = 0.648), respectively. However, mice receiving other treatments showed tumor progression by Day 24 and died within 40 days of tumor cell implantation.

Conclusions: Hydrogel carboplatin simplified intratumoral drug delivery and remained the synergistic effects with RT, which is potential for clinical applications.

Keywords: Concurrent chemoradiotherapy; Intratumoral injection; Malignant glioma; Simplified drug delivery; Sustained-release carboplatin; Thermogelling hydrogel.

MeSH terms

  • 3T3 Cells
  • Animals
  • Antineoplastic Agents / administration & dosage
  • Antineoplastic Agents / adverse effects
  • Antineoplastic Agents / chemistry
  • Antineoplastic Agents / pharmacology*
  • Brain Neoplasms / drug therapy*
  • Brain Neoplasms / radiotherapy*
  • Carboplatin / administration & dosage
  • Carboplatin / adverse effects
  • Carboplatin / chemistry
  • Carboplatin / pharmacology*
  • Cell Line, Tumor
  • Cell Survival
  • Combined Modality Therapy
  • Delayed-Action Preparations
  • Drug Carriers / chemistry
  • Drug Liberation
  • Glioma / drug therapy*
  • Glioma / radiotherapy*
  • Humans
  • Hydrogels / chemistry*
  • Injections, Intralesional
  • Materials Testing / methods
  • Mice
  • Mice, Inbred C57BL
  • Tissue Distribution

Substances

  • Antineoplastic Agents
  • Delayed-Action Preparations
  • Drug Carriers
  • Hydrogels
  • Carboplatin