Blocking monoclonal antibodies (mAbs) specific to mouse interleukin-1 receptor antagonist (IL-1ra) were prepared by immunizing Armenian hamsters with recombinant mouse IL-1ra. A sensitive and specific ELISA against mouse IL-1ra was also established. In Propionibacterium acnes-induced liver injury, P. acnes induced transient increase of serum tumor necrosis factor-alpha levels but not those of I...

IL-1R antagonist (IL-1Ra) is a natural inhibitor of the pleiotropic proinflammatory activities of IL-1. Although several reports described the effects of complete IL-1Ra deficiency, no study has examined the consequences of cell type-specific IL-1Ra inactivation during systemic inflammation. Previous in vitro data demonstrated high IL-1Ra production by hepatocytes and myeloid cells after endoto...

Several lines of evidence suggest that host genetic factors controlling the immune response influence infection by Mycobacterium tuberculosis. The proinflammatory cytokine interleukin (IL)-1beta and its antagonist, IL-1Ra (IL-1 receptor agonist), are strongly induced by M. tuberculosis and are encoded by polymorphic genes. The induction of both IL-1Ra mRNA and secreted protein by M. tuberculosi...

We studied the relationship between the production of the 23-Kd interleukin-1 receptor antagonist (IL-1ra) and IL-1 beta in cultures of human peripheral blood mononuclear cells (PBMC) using a specific radioimmunoassay for IL-1ra that had a sensitivity of 166 +/- 11 pg/mL. PBMC cultured without human serum made little IL-1ra or IL-1 beta. In the presence of 1% AB serum, there was no increase in ...

The cytokine channel’s mechanism for self-regulation involves the application of antagonistic cytokines that are synthesized to connect receptors and release soluble receptors. very first receptor antagonist was naturally present interleukin-1 (IL-1Ra). IL-1Ra protein forms disinfected from supernatants cultured monocytes on stacked IgG. family IL-1 consists IL-1α, IL-1β IL-1Ra. Human regulate ...

Interleukin (IL)-1 is a pleiotropic inflammatory cytokine that promotes angiogenesis and enhances tumor growth and metastases. We evaluated the effects of IL-1 receptor antagonist (IL-1ra) on tumor growth and metastases in human melanoma xenografts. We selected two human melanoma lines (SMEL and PMEL) with differential (high versus low, respectively) constitutive production of IL-1 by ELISA. Th...

The interleukin 1 receptor antagonist (IL-1ra) is a naturally occurring molecule that shares homology with IL-1alpha and IL-1beta and binds competitively to IL-1 receptors. Serum concentrations of IL-1ra were measured by ELISA in patients enrolled in Phase I clinical trials of IL-1alpha and IL-1beta given by 15-min infusion. Pretreatment levels of IL-1ra were <1500 (mean, 453 +/- 57) pg/ml. IL-...

BACKGROUND The cytokine interleukin (IL)-1 is an important mediator of inflammation and cardiovascular disease. Activity of this cytokine is modulated endogenously via the IL-1 receptor antagonist (IL-1Ra). The role of IL-1Ra in neointima formation after injury, however, is poorly understood. METHODS AND RESULTS Using IL-1Ra-deficient (IL-1Ra-/-; backcrossed 8 generations into the C57BL/6J ba...

The proinflammatory cytokine interleukin (IL)-1 is expressed mainly within the endothelium of atherosclerotic plaques and may be linked with inflammatory mechanisms of atherogenesis. IL-1 action is complex and regulated in part by its naturally occurring inhibitor, the IL-1 receptor antagonist (IL-1ra). Therefore, we studied differential and specific isoform expression of IL-1ra in the endothel...

background uterine leiomyoma (uls) is the most common gynecological tumor and a significant health concern for many women .the interleukin-1 receptor antagonist (il-1ra) is a naturally occurring cytokine inhibiting interleukin- 1 (il-1) activity by binding to the il-1 receptors without signal transduction. objectives the aim of this study was to investigate the association between interleukin-1...