Dendronized Polymer-Derived Nanomedicines for Mitochondrial Dynamics Regulation and Immune Modulation

Area of Science:

• Biomedical Engineering
• Nanotechnology
• Cancer Research

Background:

• Polymeric conjugates are explored for targeted cancer therapy.
• Dendron side chains can influence drug delivery and therapeutic outcomes.
• Mitochondrial function is a key target in cancer treatment.

Purpose of the Study:

• To systematically examine the effects of dendron side chains in polymeric conjugates on tumor penetration and antigen presentation.
• To investigate the mechanism of action of a novel polymer-gemcitabine conjugate (pG2-Gem) involving mitochondrial dynamics.
• To evaluate the therapeutic efficacy of pG2-Gem, alone and in combination with immunotherapy, in an animal tumor model.

Main Methods:

• Design and synthesis of three polymer-gemcitabine conjugates (pG0-Gem, pG1-Gem, pG2-Gem).
• In vivo evaluation of tumor penetration, accumulation, and antitumor effects in an animal model.
• Assessment of immune modulation, including MHC-1 antigen presentation and mitochondrial dynamics.
• Combination therapy with anti-PD-1 antibody.

Main Results:

• The pG2-Gem conjugate demonstrated enhanced tumor penetration and accumulation by binding to and regulating mitochondrial dynamics in tumor cells.
• Significant antitumor effects were observed, attributed to immune modulation via enhanced MHC-1 antigen presentation due to mitochondrial fusion and altered metabolism.
• The drug-free dendronized polymer (pG2) independently regulated mitochondrial dynamics.
• Combination therapy of pG2-Gem with anti-PD-1 antibody achieved an 87.5% tumor clearance rate and over 150 days of prolonged survival.

Conclusions:

• Dendronized polymers can be engineered to target mitochondria, enhancing drug delivery and antitumor efficacy.
• Mitochondrial dynamics modulation is a viable strategy for improving cancer immunotherapy.
• Dendronized polymers represent a promising nanoplatform for metabolic modulation and synergistic cancer treatment.