Female, 8-week-old BALB/c mice were immunized with purified recombinant proteins of the predicted immunodominant region of bovine haptoglobin (pirBoHp). Two monoclonal antibodies (MAbs), named 1B3 and 6D6, were prepared by conventional B lymphocyte hybridoma technique. Titers of ascitic fluid and cell culture supernatant of MAb 1B3 were 1:9.6×108 and 1:8.2×104, respectively, and that of MAb 6D6 were 1:4.4×105 and 1:1.0×104, respectively. The subtype of MAbs 1B3 and 6D6 was IgG1κ. In Western blot analysis, MAbs 1B3 and 6D6 could recognize the α-chain of native BoHp from plasma of dairy cows. These data indicated that MAbs 1B3 and 6D6 have a potential use for developing diagnostic reagents of BoHp.
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