Cellular proteins and extracellular matrix

Cellular proteins and extracellular matrix (ECM) represent the total protein content of cells and the complex network of extracellular macromolecules that provide structural and biochemical support (Source: StatPearls, Physiology, Extracellular Matrix). The ECM is composed of various components including collagen, elastin, fibronectin, and laminin, which regulate cell behavior and tissue homeostasis (Source: Wikipedia, Extracellular matrix). In clinical pharmacology, this broad category is often cited as the target for photosensitizing agents used in photodynamic therapy, such as Porfimer sodium and Verteporfin (Source: DrugBank, Porfimer sodium). These drugs do not bind to a single receptor but instead localize non-specifically within cellular membranes and the surrounding matrix. Upon exposure to light, the drugs catalyze the formation of singlet oxygen and other radicals, which oxidatively destroy the nearby cellular proteins and matrix structures (Source: National Cancer Institute, Photodynamic Therapy). This mechanism leads to direct tumor cell death and the destruction of tumor-associated vasculature. Because this target is a heterogeneous environment rather than a specific molecule, it is generally used as a catch-all term in drug databases for agents with broad, non-specific reactivity. Consequently, therapeutic interventions targeting this compartment must be carefully localized to avoid extensive damage to healthy tissues (Source: PubMed, Targeting the ECM).

Other names

ECMCellular proteomeExtracellular scaffoldInterstitial matrix

Non-specific localization followed by light-induced generation of reactive oxygen species (ROS) causing widespread oxidative damage to proteins and structural components.