Antibodies specific for native PrP Sc

Drug – bio-affecting and body treating compositions – In vivo diagnosis or in vivo testing

Reexamination Certificate

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C424S009200, C424S130100, C424S147100, C435S007100, C435S070100, C435S071100, C436S503000, C436S518000, C436S547000

Reexamination Certificate

active

07052675

ABSTRACT:
Antibodies are disclosed which specifically bind to native PrPScin situ. Preferred antibodies bind only to the native PrPScof a particular species e.g., human, cow, sheep, pig, etc. Particularly preferred antibodies bind specifically to a particular isoform of human PrPSc. Preferred antibodies of the invention are (1) produced by phage display methodology, (2) bind specifically to native PrPSc, (3) neutralizes the infectivity of prions, (4) bind to PrPScin situ and (5) bind 50% or more of PrPScin a liquid flowable sample. Antibodies of the invention can be bound to a substrate and used to assay a sample (which has any PrPcdenatured via proteinase K) for the presence of PrPScof a specific species which PrPScis associated with disease. Antibodies which specifically bind to human PrPSccan be labeled and injected carrying out an in vivo diagnostic test to determine if the human is infected with prions associated with disease. The antibodies are preferably produced using phage display technology wherein the genetic material in the phage expressing the antibody is obtained from a mammal with an ablated endogenous PrP protein gene and an endogenous chimeric PrP gene which mammal had been inoculated with PrPScto induce antibody production.

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