Human cardiac myosin and its pathogenic S2 fragment peptides directly stimulated human TLRs 2 and 8 and activated human monocytes to release proinflammatory cytokines.
Does human cardiac myosin stimulate innate immune responses through TLRs in human monocytes?
Human cardiac myosin acts as an endogenous ligand for TLRs 2 and 8, providing a novel mechanism linking innate and adaptive immunity in myocardial inflammation.
Autoimmune attack on the heart is linked to host immune responses against cardiac myosin, the most abundant protein in the heart. Although adaptive immunity is required for disease, little is known about innate immune mechanisms. In this study we report that human cardiac myosin (HCM) acted as an endogenous ligand to directly stimulate human TLRs 2 and 8 and to activate human monocytes to release proinflammatory cytokines. In addition, pathogenic epitopes of human cardiac myosin, the S2 fragment peptides S2-16 and S2-28, stimulated TLRs directly and activated human monocytes. Our data suggest that cardiac myosin and its pathogenic T cell epitopes may link innate and adaptive immunity in a novel mechanism that could promote chronic inflammation in the myocardium.
Zhang et al. (Wed,) conducted a other in Autoimmune attack on the heart. Human cardiac myosin (HCM) and S2 fragment peptides was evaluated on Stimulation of human TLRs 2 and 8 and activation of human monocytes to release proinflammatory cytokines. Human cardiac myosin and its pathogenic S2 fragment peptides directly stimulated human TLRs 2 and 8 and activated human monocytes to release proinflammatory cytokines.
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