1887

Abstract

The mechanisms were investigated of haematopoietic progenitor growth inhibition, observed after infection of cord blood mononuclear cells (CBMNC) by a clinical isolate of dengue 3 (29–56DSS). The level of virus replication was not different when CBMNC were inoculated with 29–56DSS compared with a prototype strain of dengue 3 (H-87) which had no inhibitory effect. An inhibitory effect was also observed when cell-free and heat-inactivated supernatants from 29–56DSS cultures, but not from H-87 cultures, were added to cultures of normal CBMNC, suggesting an indirect mechanism via the release of soluble suppressive factor(s). Macrophage inflammatory protein-1a (MIP-1α ) was detected at a significantly higher level in 29–56DSS cultures than in controls. Blocking experiments with anti-MIP-1α antibody demonstrated that the inhibitory effect was related at least partly to high MIP-1α levels. To our knowledge, this is the first report suggesting an indirect effect of dengue infection on haematopoiesis mediated by a suppressive cytokine.

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/content/journal/jgv/10.1099/0022-1317-79-8-1889
1998-08-01
2024-04-26
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