Related Experiment Video
Updated: Jul 24, 2025
Anticancer Efficacy of Photodynamic Therapy with Lung Cancer-Targeted Nanoparticles
Published on: December 1, 2016
PD-L1 Blockade Peptide-Modified Polymeric Nanoparticles for Oxygen-Independent-Based Hypoxic Tumor
Xiaotong Gu1, Bin Wu1, Guoyan Feng2
1School of Pharmacy, Shandong New Drug Loading & Release Technology and Preparation Engineering Laboratory, Binzhou Medical University, 346 Guanhai Road, Yantai 264003, P. R. China.
Abstract:
Distant metastasis of malignant tumors is considered to be the main culprit for the failure of current antitumor treatments. Conventional single treatments often exhibit limited efficacy in inhibiting tumor metastasis. Therefore, there is a growing interest in developing collaborative antitumor strategies based on photothermal therapy (PTT) and free-radical-generated photodynamic therapy (PDT), especially utilizing oxygen-independent nanoplatforms, to address this challenge. Such antitumor strategies can enhance the therapeutic outcomes by ensuring the cytotoxicity of free radicals even in the hypoxic tumor microenvironment, thereby improving the effective suppression of primary tumors. Additionally, these approaches can stimulate the production of tumor-associated antigens and amplify the immunogenic cell death (ICD) effects, potentially feasible for enhancing the therapeutic outcomes of immunotherapy. Herein, we fabricated a functional nanosystem that co-loads IR780 and 2,2'-azobis[2-(2-imidazolin-2-yl)propane]-dihydrochloride (AIPH) to realize PTT-triggered thermodynamic combination therapy via the oxygen-independent pathway for the elimination of primary tumors. Furthermore, the nanocomposites were surface-decorated with a predesigned complex peptide (PLGVRGC-anti-PD-L1 peptide, MMP-sensitive), which facilitated the immunotherapy targeting distant tumors. Through the specific recognition of matrix metalloproteinase (MMP), the sensitive segment on the obtained aNC@IR780A was cleaved. As a result, the freed anti-PD-L1 peptide effectively blocked immune checkpoints, leading to the infiltration and activation of T cells (CTLs). This nanosystem was proven to be effective at inhibiting both primary tumors and distant tumors, providing a promising combination strategy for tumor PTT/TDT/immunotherapy.
Insights
This study developed a novel nanosystem combining photothermal therapy (PTT) and oxygen-independent photodynamic therapy (PDT) to eliminate primary tumors. It also targets distant tumors via immunotherapy, enhancing cancer treatment efficacy.
Area of Science:
- Biomedical Engineering
- Nanotechnology
- Cancer Therapy
Background:
- Distant tumor metastasis is a major challenge in cancer treatment, often limiting the effectiveness of conventional therapies.
- Hypoxic tumor microenvironments hinder treatments relying on oxygen-dependent mechanisms.
- Combination therapies are needed to overcome treatment resistance and target both primary and metastatic tumors.
Purpose of the Study:
- To develop a functional nanosystem for combined photothermal therapy (PTT) and oxygen-independent photodynamic therapy (PDT) to eliminate primary tumors.
- To engineer the nanosystem for targeted immunotherapy against distant tumors by utilizing an anti-PD-L1 peptide.
- To evaluate the efficacy of this multi-modal therapeutic strategy in inhibiting both primary and distant tumors.
Main Methods:
- Fabrication of a nanosystem co-loading IR780 (for PTT) and 2,2'-azobis[2-(2-imidazolin-2-yl)propane]-dihydrochloride (AIPH) (for oxygen-independent PDT).
- Surface decoration of the nanocomposites with a matrix metalloproteinase (MMP)-sensitive peptide conjugated to an anti-PD-L1 antibody for targeted immunotherapy.
- In vitro and in vivo evaluation of the nanosystem's ability to trigger PTT/PDT, release the anti-PD-L1 peptide in response to MMPs, block immune checkpoints, and inhibit primary and distant tumor growth.
Main Results:
- The developed nanosystem effectively delivered therapeutic agents and generated cytotoxic effects via PTT and oxygen-independent PDT, suppressing primary tumors.
- The MMP-sensitive peptide cleavage released the anti-PD-L1 moiety, which blocked immune checkpoints and promoted T cell infiltration and activation.
- The combination therapy demonstrated significant inhibition of both primary and distant tumor growth, highlighting its potential for comprehensive cancer treatment.
Conclusions:
- The fabricated nanosystem offers a promising strategy for synergistic PTT, oxygen-independent PDT, and immunotherapy.
- This multi-modal approach effectively targets primary tumors and distant metastases by overcoming hypoxia and modulating the immune response.
- The study presents a viable platform for developing advanced combination cancer therapies with enhanced therapeutic outcomes.
More Related Videos
10:18Author Spotlight: Magnetic Fluorescent Bead-Based Dual-Reporter Flow Analysis of PDL1-Vaxx Peptide Vaccine-Induced Antibody Blockade of the PD-1/PD-L1 Interaction
Published on: July 7, 2023
09:45Photodynamic Therapy with Blended Conducting Polymer/Fullerene Nanoparticle Photosensitizers
Published on: October 28, 2015