Nanopurpurin-based photodynamic therapy destructs extracellular matrix against intractable tumor metastasis

Area of Science:

• Biomedical Engineering
• Cancer Therapy
• Nanotechnology

Background:

• Nanomaterials-based photodynamic therapy (PDT) is utilized for malignant cell treatment.
• The impact of nanomaterials-based PDT on the mechanical properties of intractable tumor cells remains unclear.

Purpose of the Study:

• To investigate the effect of nanopurpurin-based PDT on the mechanical properties and behaviors of Taxol-resistant tumor cells.
• To understand how PDT-induced extracellular matrix (ECM) destruction influences therapy sensitivity and tumor metastasis.

Main Methods:

• Utilized nanopurpurin-confined liposomes (P18⊂L) for PDT.
• Employed Fluorescence Intensity Ratio Microscopy (FIRMS) and confocal microscopy to observe ECM disruption and cellular changes.
• Assessed changes in cell adhesion force, biomechanical properties, and actomyosin-based contractility.
• Evaluated inhibition of cell migration and metastasis in vivo.

Main Results:

• Nanopurpurin-based PDT destructed the extracellular matrix (ECM) of Taxol-resistant cells.
• This ECM disruption led to decreased cell adhesion force and biomechanical properties by attenuating actomyosin-based contractility.
• The treatment inhibited cell migration and metastasis in vivo.
• Destroyed ECM enhanced overall therapy sensitivity.

Conclusions:

• Nanopurpurin-based PDT effectively reduces the mechanical forces of intractable tumor cells by targeting the ECM.
• This approach enhances therapeutic sensitivity and offers a potential strategy to inhibit tumor metastasis.
• Understanding these mechanical effects provides a basis for developing novel therapeutic strategies against resistant tumors.