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Tat-neutralizing antibodies compared in vaccinated macaques.(AIDS vaccine development)(Brief Article)

Vaccine Weekly

| April 16, 2003 | COPYRIGHT 2003 NewsRX. This material is published under license from the publisher through the Gale Group, Farmington Hills, Michigan.  All inquiries regarding rights should be directed to the Gale Group. (Hide copyright information)Copyright

2003 APR 16 - (NewsRx.com & NewsRx.net) -- Researchers at the Institute of Human Virology, at the University of Maryland, compared antisera of macaques immunized with Tat or chemically modified Tat toxoid having the same clade B sequence "for their abilities to recognize diverse Tat sequences."

I. Tikhonov and colleagues explained that they constructed "an overlapping peptide array covering three clade B and two clade C Tat sequences ... to help identify reactive linear epitopes."

They reported, "Sera from Tat-immunized macaques were broadly cross-reactive with clade B and clade C sequences but recognized a clade B-specific epitope in the basic domain. Sera from Tat toxoid-immunized macaques had a more restricted pattern of recognition, reacting mainly with clade B and with only one clade B basic domain sequence, which included the rare amino acids RPPQ at positions 57 to 60.

"Monoclonal antibodies against the amino terminus or the domain RPPQ sequence blocked Tat uptake into T cells and neutralized Tat in a cell-based ...

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