Cellular and vascular membranes in tumor microvasculature

Cellular and vascular membranes in the tumor microvasculature refer to the lipid bilayers and structural boundaries of both malignant cells and the endothelial cells forming the blood vessels within a tumor. This target is primarily associated with photodynamic therapy (PDT), where photosensitizing agents like porfimer sodium selectively accumulate in these regions due to the unique physiological properties of the tumor microenvironment, such as increased vascular permeability (NCI Drug Dictionary). Upon activation by specific wavelengths of light, these agents generate reactive oxygen species (ROS), such as singlet oxygen, which induce lipid peroxidation and protein cross-linking (DrugBank DB00435). This process leads to the direct destruction of tumor cells and the collapse of the tumor's blood supply through vascular occlusion and membrane disruption (Agostinis et al., 2011). Consequently, the target plays a critical role in the therapeutic strategy of inducing localized necrosis and inhibiting tumor growth by starving the malignancy of nutrients and oxygen (FDA Label for Photofrin). While not a single molecular entity, these membranes serve as the functional site of action for several approved and experimental photosensitizers used in oncology.

Other names

Tumor vascular membranesNeovascular membranesCellular membranes of the tumor microenvironment

Photosensitization and generation of reactive oxygen species (ROS) leading to membrane disruption and vascular occlusion