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Conjugated CD20 vaccine elicits specific, polyclonal immune response in mice.(Brief Article)

Vaccine Weekly

| July 17, 2002 | COPYRIGHT 2002 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

2002 JUL 17 - (NewsRx.com & NewsRx.net) -- by Maria G. Essig, MS, ELS, senior medical writer - The CD20 antigen, expressed only on B lineage cells before differentiation into plasma cells, produced a strong, specific, polyclonal immune response in mice, researchers in New York have found.

"Monoclonal antibodies to CD20 have been used successfully in the treatment of B-cell lymphomas," explained W.K. Roberts and colleagues at the Memorial Sloan-Kettering Cancer Center in New York City. "Vaccine therapy would have the advantage of generating a polyclonal response to the antigen in contrast to the monoclonal response of an infused antibody."

The investigators inoculated Balb/c mice with a vaccine consisting of human or mouse CD20 peptides conjugated to carrier proteins, and an OS21 adjuvant.

Enzyme-linked immunosorbent assay (ELISA) revealed that inoculation stimulated a high-titer, specific antibody response to several CD20 epitopes. Flow cytometry showed weak antibody binding to native cellular CD20. In some samples, outright death of CD20-expressing cells was caused by antibody-mediated complement. Vaccination with the CD20 antigen also elicited production of interleukin 4 and interferon (gamma).

A 25% decrease in splenic B cells expressing CD19 (compared with control) occurred in mice that received the ...

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Source: HighBeam Research, Conjugated CD20 vaccine elicits specific, polyclonal immune response...

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