The Experts for High Quality Fusion Proteins Chimerigen Laboratories, LLC (Chimerigen) develops, manufactures and markets high quality and leading edge proteins for biomedical and immunology research. One of Chimerigen's specialty is the production of unique immunoglobulin based chimeric fusion proteins using advanced cellular and molecular biological techniques. These reagents are used successfully in basic and applied research. Because of the high performance characteristics and quality the Chimerigen fusion proteins are widely recognized reagents and are cited in many scientific publications. Non-lytic Ig-based Chimeric Fusion Cytokines with Long Circulating Half-life The potential clinical application of cytokines to modulate immune responses is very high. Unfortunately, most cytokines have short circulating half-lives. Therefore, to facilitate the study of cytokine effects in vivo, a variety of non-lytic immunoglobulin-based chimeric cytokine fusion proteins have been created, in which a cytokine sequence had been genetically fused to the hinge, CH2 and CH3 regions of an immunoglobulin. These non-lytic fusion proteins possess both the biological functions of the cytokine moiety and a prolonged circulating half-life determined by the Fc domain. Mutations to the complement (C1q) and FcgR I binding sites of the IgGs Fc fragment render the fusion proteins incapable of antibody directed cytotoxicity (ADCC) and complement directed cytotoxicity (CDC). These fusion molecules also have the promise of being minimally to negligibly immunogenic since they are made entirely from elements derived from the species to be treated.
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