Abstract
Monocytes play an important role in hemostasis. In this study, the prothrombotic effects of the neuropeptide substance P (SP) on human monocytes through neurokinin-1 receptor (NK1-R) were characterized. SP upregulated monocyte tissue factor (TF), the major coagulation cascade stimulator, in a concentration and time dependent manner. Specific inhibition of NK1-R completely blocked TF expression. Monocytes stimulated by SP released cytokines and chemokines. When monocytes were stimulated with cytokines or chemokines, TF was expressed by the cytokines (GM-CSF, IFN-γ and TNF-α). Cytokines may play a major role in the mechanism of SP induced monocyte TF expression. NK1-R antagonists (NK1-RA) may have a role in developing novel therapeutic approaches to patients vulnerable to vaso-occlusive disorders.
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