Necrotic and pathologically altered tissue proteins and plasma membrane phospholipids

Necrotic and pathologically altered tissue proteins and plasma membrane phospholipids represent a composite therapeutic and diagnostic target found in the core of solid tumors and infarcted tissues. In healthy cells, the plasma membrane acts as a barrier that prevents circulating molecules from accessing intracellular proteins and the inner leaflet of the phospholipid bilayer. However, during necrosis or severe pathological stress, membrane integrity is lost, exposing these internal components to the extracellular environment. This exposure allows specialized molecules, such as necrosis-avid contrast agents (NACAs) and tumor necrosis therapy (TNT) antibodies, to selectively bind and accumulate within damaged tissues. This target is particularly significant in oncology and cardiology, where it is used to deliver radiopharmaceuticals or imaging contrast to the center of tumors or areas of myocardial infarction. Because the necrotic core of a tumor is often poorly vascularized and resistant to conventional chemotherapy, targeting the stable proteins and lipids in these regions provides a unique mechanism for localized therapy. Drugs like hypericin and chTNT-1/B utilize this target to achieve high tumor-to-background ratios, facilitating both the visualization of dead tissue and the delivery of therapeutic isotopes directly to the site of disease (Epstein et al., 1988, PubMed ID: 2845435; Ni et al., 2011, PubMed ID: 21431587).

Other names

Necrotic tissue antigensNecrotic core componentsExposed intracellular proteins and phospholipidsNecrosis-associated antigensPathologically altered tissue components

Drugs target these components by exploiting the loss of cell membrane integrity in necrotic or pathologically altered cells, allowing the agent to bind to intracellular proteins (such as histones or cytoskeletal elements) and membrane phospholipids that are normally sequestered from the systemic circulation in healthy cells (Ni et al., 2005, PubMed ID: 16103193; Chen et al., 2001, PubMed ID: 11532593).