Heavy chain-hyaluronan complex (HC-HA) (HC-HA)

The Heavy chain-hyaluronan (HC-HA) complex, also known as the SHAP-HA complex, is a specialized extracellular matrix (ECM) structure formed during acute and chronic inflammation (Milner & Day, 2003; He et al., 2013). It is generated through the covalent attachment of heavy chains (HCs) from inter-alpha-trypsin inhibitor (IαI) to hyaluronan (HA), a process catalyzed by the enzyme TSG-6 (Tumor Necrosis Factor-Inducible Gene 6 protein) (Rugg et al., 2005; Zhuo et al., 2004). This complex plays a critical role in stabilizing the ECM and modulating the inflammatory response by promoting leukocyte adhesion and sequestration (Wisniewski & Vilcek, 2004). In the context of tissue injury, HC-HA can integrate with fibrin to form a provisional matrix that guides wound healing and tissue repair (Milner & Day, 2003). Dysregulation of HC-HA formation is associated with various inflammatory pathologies, including rheumatoid arthritis, asthma, and sepsis, making the components of this pathway attractive therapeutic targets (He et al., 2013). Drugs like Ulinastatin, which contains the bikunin subunit of IαI, are used to modulate this pathway, while recombinant TSG-6 is under investigation for its potent anti-inflammatory properties (Wisniewski & Vilcek, 2004; He et al., 2013).

Other names

SHAP-HA complexSerum-derived hyaluronan-associated protein-hyaluronan complexInter-alpha-inhibitor-hyaluronan complexFibrin/HC-HA matrix

Inhibition of HC-HA complex formation, stabilization of hyaluronan, competitive inhibition of TSG-6 mediated transfer, and protease inhibition.