Improved generation of catalytic antibodies by MRL/MPJ-lpr/lpr autoimmune mice.
To compare the abilities of different strains of mice to elicit catalytic antibodies (Abs), we determined the occurrence of esterolytic Abs in BALB/c (normal strain) and MRL/MPJ-lpr/lpr (MRL/lpr, autoimmune) mice after immunization with the transition state analog (TSA) 1. Hybridoma supernatants elicited against TSA 1 were screened by ELISA for binding to the BSA-conjugated TSA 1 (=3b), and then screened for binding to the BSA-linked short TSA 2 (=4). We obtained eight times more positives from MRL/lpr mice than from BALB/c mice by these screening steps. The monoclonal antibodies (mAbs) obtained here were examined for binding and catalytic activity. Fifteen of 25 mAbs from MRL/lpr had esterolytic activity, compared with only two of 21 mAbs from BALB/c. These results demonstrated that the occurrence of catalytic Abs was much higher in MRL/lpr mice than in BALB/c mice, which is in good agreement with the previous report by Tawfik et al. [Tawfik, D.S., Chap, R., Green, B.S., Sela, M., Eshhar, Z., 1995. Proc. Natl. Acad. Sci. U.S.A. 92, 2145-2149] using a different kind of TSA. Thus, these studies strongly suggest that using the appropriate strain can be a key factor in the efficient production of catalytic Abs. Furthermore, these mAbs were characterized to elucidate the mechanism of strain difference, and determine whether MRL/lpr mice can be used with other TSAs for the efficient production of catalytic Abs.
Takahashi
N
N
Laboratory of Life Science and Biomolecular Engineering, Japan Tobacco, 6-2, Umegaoka, Aoba-ku, Yokohama, Japan. naoko.takahashi@ims.jti.co.jp
Kakinuma
H
H
Hamada
K
K
Shimazaki
K
K
Yamasaki
Y
Y
Matsushita
H
H
Nishi
Y
Y
D000818:Animals; D017151:Antibodies, Catalytic / Q000096:biosynthesis*; D015551:Autoimmunity / Q000276:immunology*; D004950:Esterases / Q000096:biosynthesis*; D007074:Immunoglobulin G / Q000097:blood; D007132:Immunoglobulin Isotypes / Q000097:blood; D051379:Mice; D008807:Mice, Inbred BALB C / Q000276:immunology; D019463:Mice, Inbred MRL lpr / Q000276:immunology*
D017151:Antibodies, Catalytic; D007074:Immunoglobulin G; D007132:Immunoglobulin Isotypes; D004950:Esterases