# Construction of Multifunctional Fe3O4@MSN@PDA-HA-FA Nanocarriers and Research on Synergistic Tumor Therapy

## TL;DR

Researchers created a multifunctional nanoparticle that combines photothermal and chemodynamic therapies to improve cancer treatment effectiveness.

## Contribution

A novel Fe3O4@MSN@PDA-HA-FA nanocarrier is developed for synergistic tumor therapy combining PTT, CDT, and chemotherapy.

## Key findings

- The nanocarrier shows high photothermal conversion and heat transfer efficiency under near-infrared light.
- It enhances hydroxyl radical generation via Fenton reaction for chemodynamic therapy.
- In vitro experiments confirm the synergistic antitumor efficacy of combined therapies.

## Abstract

Background: Chemodynamic therapy (CDT) and photothermal therapy (PTT) based on nanomaterials have garnered widespread attention in cancer treatment. However, most single-modal nanotherapeutics suffer from limited therapeutic efficacy. Methods: Herein, a magnetic mesoporous composite nanoparticle, Fe3O4@MSN@PDA-HA-FA, is successfully fabricated, with Fe3O4 nanoparticles as the magnetic core; mesoporous silica nanoparticles (MSNs) as the mesoporous shell; and dopamine hydrochloride (DA·HCl), hyaluronic acid (HA), and folic acid (FA) as the functional ligands. Results: Notably, this composite serves as both an efficient photothermal converter and a chemodynamic promoter, enhancing hydroxyl radical (·OH) generation and improving PTT efficacy. Under near-infrared (NIR) light irradiation, Fe3O4@MSN@PDA-HA-FA exhibits high photothermal conversion and heat transfer efficiencies. The Fe2+ ions in Fe3O4 enable a Fenton reaction-mediated conversion of endogenous hydrogen peroxide (H2O2) into ·OH for CDT. Additionally, the MSNs provide a substantial drug-loading capacity, while the HA and FA provide additional surface functionalities that can modulate the nano-bio interactions and improve colloidal stability. Conclusions: In vitro experiments validate the synergistic therapeutic efficacy of PTT, CDT, and chemotherapy. This study demonstrates that Fe3O4@MSN@PDA-HA-FA exhibits antitumor efficacy, laying a promising foundation for its potential clinical translation in cancer treatment.