Chlorin e6-Based Photodynamic Therapy for Metastatic Melanoma: An In Vitro Efficacy Study

Area of Science:

• Oncology
• Biochemistry
• Photomedicine

Background:

• Melanoma is an aggressive skin cancer with limited treatment options.
• Photodynamic therapy (PDT) offers a localized, noninvasive treatment approach.
• Photosensitizers are key to PDT, generating reactive oxygen species (ROS) to kill cancer cells.

Purpose of the Study:

• To investigate the in vitro efficacy of Chlorin e6 (Ce6)-mediated PDT on metastatic melanoma (A375) cells.
• To evaluate the impact of different laser fluence levels (5 and 15 J/cm²) and time points (24 and 48 hours) on Ce6-PDT effectiveness.

Main Methods:

• Utilized ATP viability testing, microscopy, oxidative stress assessment, and apoptosis assays.
• Applied Ce6-mediated photodynamic therapy with a 660 nm laser at 5 J/cm² and 15 J/cm².
• Examined cellular alterations in A375 melanoma cells at 24 and 48 hours post-treatment.

Main Results:

• Ce6-PDT significantly decreased metastatic melanoma cell viability at both tested fluence levels.
• Increased ROS generation and induction of apoptosis were observed in A375 cells following Ce6-PDT.
• Cellular damage and death were evident at 5 J/cm² and 15 J/cm² PDT doses.

Conclusions:

• Ce6-mediated PDT demonstrates significant in vitro efficacy against metastatic melanoma cells.
• Ce6 shows potential as a photosensitizer for melanoma treatment, particularly within nanobioconjugate platforms.