Summary
Non-syncytium inducing (NSI) and syncytium inducing (SI) variants of human immunodeficiency virus (HIV) isolated from peripheral blood mononuclear cells (PBMC) could be definitely typed by sequence analysis of the env-gene V3 region. It was thus possible to compare the genotypes of viral variants isolated from PBMC and accompanying monocyte cultures and those derived directly from the patients' blood cells prior to cultivation. Within the investigated group of patients it was shown that HIV variants colonizing monocytes displayed a similar shift from NSI to SI as observed previously for PBMC, i.e. lymphocyte derived isolates. Lymphocytic SI variants could be isolated from the blood of patients, while simultaneously the predominant provirus in both blood and monocytic isolate was NSI. Consequently, we observed a delayed switch in the predominant provirus genotype found in blood which was associated with a synchronous change in the genotype of the corresponding monocytic isolate. The results show that monocytes/macrophages can be colonized by heterogeneous HIV variants in vivo and can therefore also function as carriers for the spread of highly virulent SI variants into the tissues.
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Witt, A., Kaiser, R., Mayer, A. et al. HIV colonizing peripheral blood monocytes follows lymphocytic isolates in shifting from NSI to SI genotype. Archives of Virology 141, 1833–1846 (1996). https://doi.org/10.1007/BF01718198
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DOI: https://doi.org/10.1007/BF01718198