| Abstract: | In order to develop an immunoassay for DNA modifications resulting from exposure to crotonaldehyde, monoclonal antibodies specific for the 8R,6R- and 8S,6S-stereoisomers of 3-(2-deoxy-beta-D-erythro-pentofuranosyl)-5,6,7,8-tetrahydro-8-hydroxy-6 - methylpyrimido[1,2-a]purine-10(3H)one were produced. These cyclic 1,N2-propanodeoxyguanosines are formed in DNA exposed to crotonaldehyde in vitro. Three of the four antibodies were most specific for one stereoisomer while the fourth was most specific for the other stereoisomer. Fifty % inhibition of binding in an enzyme-linked immunoabsorbent assay using two of these antibodies and capable of detecting 0.5 mumol of 1,N2-propanodeoxyguanosine per mol of deoxyguanosine was developed. The method was validated by comparison to results obtained with fluorescence assay. |
