alexa Interferon-gamma is a major regulator of C1-inhibitor synthesis by human blood monocytes.
Haematology

Haematology

Journal of Hematology & Thromboembolic Diseases

Author(s): Lotz M, Zuraw BL

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Abstract C1 inhibitor (C1INH) is the major control factor for the activation of the classical pathway of complement and for contact system activation. Hepatocytes and blood monocytes are known to synthesize this protease inhibitor. We studied the regulation of monocyte C1INH production by mediators that are generated during inflammatory responses. Purified blood monocytes spontaneously synthesized and secreted C1INH only after prolonged culture. In the presence of interferon (IFN)-gamma, C1INH was detectable within 24 hr and continued to be released at high levels throughout an 8-day culture period. Monocyte C1INH was newly synthesized and was functionally active as determined by forming stable complex with C1s. Other monocyte stimuli were either less potent (IFN-alpha, IFN-beta) or not capable of increasing C1INH release (lipopolysaccharide, interleukin 1, and tumor necrosis factor). The second component of complement, C2, was induced by IFN-gamma to a similar extent as C1INH. These findings demonstrate that IFN-gamma is a major regulator of monocyte C1INH production and may warrant consideration of IFN-gamma in the treatment of C1INH deficiency states.
This article was published in J Immunol and referenced in Journal of Hematology & Thromboembolic Diseases

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