1887

Abstract

Cytomegalovirus (CMV) has evolved multiple immunological evasion strategies, including the encoding of viral interleukin (IL)-10 homologues (cmvIL-10). In this study, cmvIL-10 bound avidly to the same receptors on blood mononuclear cells and was as bio-potent as native human IL-10. Seventeen percent of plasma samples from 3200 Danish blood donors (corresponding to 28 % of the anti-CMV IgG-positive donors) contained substantial levels of anti-cmvIL-10 IgG antibodies, as measured by a radioimmunoassay for human anti-cmvIL-10 antibodies. The antibodies neither cross-reacted with native human IL-10 nor with Epstein–Barr virus-encoded IL-10. Anti-cmvIL-10 antibodies potently inhibited the binding of cmvIL-10 to cellular receptors, and they specifically inhibited cmvIL-10-induced JAK–STAT signalling. Ultimately, anti-cmvIL-10 antibodies blocked the inhibitory effect of cmvIL-10 on lipopolysaccharide-induced tumour necrosis factor alpha and IL-1β from blood mononuclear cells. Taken together, our data signify that cmvIL-10 has been produced during CMV infection, and that anti-cmvIL-10 IgG antibodies represent an effective immunological counter reaction against cmvIL-10.

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2011-07-01
2020-08-04
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