Cancer-microenvironment triggered self-assembling therapy with molecular blocks

Area of Science:

• Biomedical Engineering
• Nanotechnology
• Cancer Therapy

Background:

• Current drug delivery systems (DDS) face challenges in anticancer drug accumulation due to stromal tissue blockage and intracellular transport inefficiencies.
• Improving cancer therapy efficacy remains a significant challenge, necessitating innovative approaches beyond traditional DDS.

Purpose of the Study:

• To develop a drug-free cancer microenvironment-targeting therapy using molecular blocks (MBs) to overcome DDS limitations.
• To enhance the efficiency of cancer treatment by designing MBs for improved circulation, tumor penetration, and targeted cancer cell membrane disruption.

Main Methods:

• Designed molecular blocks (MBs) responsive to the acidic tumor microenvironment (pH ~6.5) using deoxycholic acid (DCA) conjugated to 4-arm poly(ethylene glycol) (4-MB).
• Investigated MB self-assembly on cancer cell surfaces in response to acidic conditions, leading to membrane disruption and cell death.
• Evaluated MB accumulation in tumors and their efficacy in suppressing tumor growth in vivo.

Main Results:

• The DCA-conjugated 4-arm PEG (4-MB) demonstrated self-assembly on cancer cell membranes under acidic conditions.
• Significant cytotoxicity was observed due to MB-induced cancer cell membrane disruption.
• Efficient tumor accumulation and effective in vivo tumor growth suppression were achieved with the MB therapy.

Conclusions:

• The developed MB therapy offers a novel, drug-free strategy to target the cancer microenvironment, overcoming limitations of conventional DDS.
• This approach enhances therapeutic efficiency by directly disrupting cancer cell membranes via MB self-assembly, avoiding complex intracellular drug transport.
• MB therapy shows promise as a new strategy for effective cancer treatment with potential for reduced side effects.