NIR-guided dendritic nanoplatform for improving antitumor efficacy by combining chemo-phototherapy

Area of Science:

• Biomedical Engineering
• Nanotechnology
• Cancer Therapy

Background:

• Phototherapy (PTT/PDT) offers localized cancer treatment but often leads to tumor recurrence.
• Novel strategies are needed to enhance phototherapy efficacy and prevent tumor regrowth.

Purpose of the Study:

• To develop a near-infrared (NIR) guided dendritic nanoplatform for synergistic chemotherapy and phototherapy.
• To improve anti-tumor efficacy and reduce tumor recurrence in cancer treatment.

Main Methods:

• A theranostic nanoplatform, iRGD-cypate-PAMAM-DTX (RCPD), was synthesized by combining a fluorescent ligand (ICG derivative cypate), a tumor penetration peptide (iRGD), and a dendrimer (PAMAM) loaded with doxorubicin (DTX).
• The RCPD platform was characterized for its photophysical properties and therapeutic efficacy in vitro and in vivo.

Main Results:

• The synthesized RCPD exhibited enhanced singlet oxygen generation, maintained fluorescence, and retained heat generation under NIR irradiation.
• Combined chemo-phototherapy using RCPD and NIR light significantly improved anti-tumor activity compared to monotherapy.
• The combinatorial treatment demonstrated a reduced risk of tumor recurrence in preclinical studies.

Conclusions:

• The multifunctional RCPD theranostic platform shows promise for NIR fluorescence image-guided combination cancer therapy.
• This approach offers a potential strategy to overcome limitations of single-modality phototherapy and reduce tumor recurrence.