[Preparation, characterization and preliminary application of monoclonal antibody against human mu chain].

AIM: To prepare monoclonal antibody (mAb) against human mu chain with high titer and establish a capture ELISA for early serological diagnosis of infectious diseases.

METHODS

BALB/c mice were immunized with human IgM. Hybridoma cell line which could stably secret the mAb to human IgM was established by routine cell fusion technique. mAb's characteristics (titer, Ig subclass, specificity and relative affinity) were identified by indirect ELISA and Western blot, respectively. A capture ELISA was established by using purified mAb to capture specific IgM for early diagnosis of Japanese encephalitis.

RESULTS

One hybridoma cell line 2E5 stably secreting mAb against human IgMmu chain was obtained. The titer of ascites of the mAb was 1 x 10(-6) and the Ig subclass was IgG1(kappa). Relative affinity of 2E5 was 1 x 10 (-5). Western blot analysis showed that mAb 2E5 reacted specifically to mu chain. Both sensitivity and specificity of the capture ELISA in detecting specific IgM in Japanese encephalitis patients sera were high.

CONCLUSION

mAb 2E5 against human mu chain was prepared successfully, and a capture ELISA for early serological diagnosis of Japanese encephalitis was set up.