Cellular components in light-exposed tumor tissue

Cellular components in light-exposed tumor tissue is a descriptive term rather than a specific molecular target, typically used to characterize the site of action for photodynamic therapy (PDT). In PDT, a photosensitizing agent like porfimer sodium accumulates in tumor cells and, upon exposure to specific wavelengths of light, generates reactive oxygen species (ROS), particularly singlet oxygen (FDA, 2011). These ROS induce non-specific oxidative damage to a wide array of cellular components, including lipids in the plasma membrane and proteins within organelles such as mitochondria and lysosomes (NCI, 2023). This widespread damage triggers various cell death pathways, including apoptosis and necrosis, and can also lead to the destruction of tumor-associated vasculature (StatPearls, 2023). Because this 'target' encompasses a broad range of molecules and structures rather than a single protein or receptor, it is considered a non-specific therapeutic site. This approach is clinically utilized for treating various solid tumors, including those of the esophagus, lungs, and skin.

Other names

Tumor cellular componentsPhotosensitizer targetsPDT targets

Generation of reactive oxygen species (ROS), primarily singlet oxygen, upon light activation of a photosensitizer, leading to non-specific oxidative damage of cellular membranes and organelles.