Positively charged extracellular proteins

Positively charged extracellular proteins represent a functional class of proteins characterized by high isoelectric points, enabling them to interact electrostatically with negatively charged components of the extracellular environment, such as glycosaminoglycans (GAGs), heparan sulfate, and extracellular DNA (eDNA). This group encompasses a wide range of molecules, including growth factors (e.g., FGF, VEGF), chemokines, degradative enzymes (e.g., elastase, hyaluronidase), and cytotoxic proteins released during cell death, most notably extracellular histones. In physiological conditions, these proteins are essential for organizing the extracellular matrix (ECM) and regulating signaling gradients. However, their dysregulated release or overabundance is a hallmark of various diseases, including sepsis, where extracellular histones act as major mediators of systemic inflammation and organ failure. Therapeutic targeting of this class typically involves the use of polyanionic drugs like pentosan polysulfate sodium or non-anticoagulant heparinoids (e.g., STC3141), which bind and neutralize these cationic proteins to prevent their pro-inflammatory and tissue-damaging effects.

Other names

Cationic extracellular proteinsCationic proteinsBasic extracellular proteinsHeparin-binding proteins

Electrostatic binding and neutralization of cationic proteins to inhibit pro-inflammatory signaling, sequester growth factors, and prevent enzymatic degradation of the extracellular matrix.