Coagulum

Coagulum is a general physiological term for a semi-solid mass formed by the coagulation of a liquid, most commonly referring to a blood clot (thrombus) or a seminal clot [22, 24]. In hematology, a blood coagulum is a complex structure composed of a fibrin protein mesh that traps platelets and red blood cells to stop bleeding; however, its pathological formation within blood vessels can lead to occlusive diseases such as myocardial infarction and ischemic stroke [2, 27]. In the reproductive system, the seminal coagulum is formed by the cross-linking of semenogelin proteins, which serves to protect and immobilize spermatozoa until it is liquefied by the protease prostate-specific antigen (PSA) [1, 3, 12]. Additionally, certain pathogens like Staphylococcus aureus utilize enzymes such as staphylocoagulase to induce coagulum formation as a defense mechanism against the host immune system [28]. While Coagulum itself is a physical structure rather than a single molecular target, its formation and dissolution are the primary focus of various therapeutic classes, including anticoagulants, antiplatelets, and thrombolytics [5, 17, 28]. Drugs like alteplase and tenecteplase target the stability of the coagulum by promoting the degradation of its fibrin matrix to restore physiological flow [31].

Other names

ClotThrombusCoagulated massBlood clotSemen clotProtein aggregateCurdGrume

Thrombolytic drugs act as plasminogen activators, converting plasminogen into the enzyme plasmin, which proteolytically degrades the fibrin meshwork that maintains the structural integrity of a blood coagulum [31]. In the reproductive system, the seminal coagulum is naturally degraded by prostate-specific antigen (PSA), a serine protease that cleaves semenogelin proteins to facilitate sperm release [3, 12, 33]. In neurodegenerative contexts, therapeutic strategies aim to activate autophagy (e.g., via p62) to eliminate misfolded protein coagula [4].