To analyze HIV envelope protein (env) specific BiTE antibody constructs for their potential to lyse infected
cells, antibody specificities and human CD4, as env receptor, were put into BiTE format. BiTE antibody
constructs were tested in vitro showing a nM affinity to env and mediated lysis of transfected cells at pM
levels. On infected cells, the CD4 BiTE inhibited viral replication at nM levels. The CD4 BiTE significantly
reduced the viral load in mice engrafted with infected human PBMCs. To increase the BiTE half-life, fusions
with a serum albumin binding peptide were tested in vitro at which the C-terminally tagged CD4 BiTE showed
the best bioactivity.
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To analyze HIV envelope protein (env) specific BiTE antibody constructs for their potential to lyse infected
cells, antibody specificities and human CD4, as env receptor, were put into BiTE format. BiTE antibody
constructs were tested in vitro showing a nM affinity to env and mediated lysis of transfected cells at pM
levels. On infected cells, the CD4 BiTE inhibited viral replication at nM levels. The CD4 BiTE significantly
reduced the viral load in mice engrafted with infected human PBMCs....
»