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Production of a monoclonal antibody useful in the molecular characterization of murine T-cell-replacing factor/B-cell growth factor II.
Harada N
,
Takahashi T
,
Matsumoto M
,
Kinashi T
,
Ohara J
,
Kikuchi Y
,
Koyama N
,
Severinson E
,
Yaoita Y
,
Honjo T
.
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T-cell-replacing factor (TRF) is a T-cell-derived factor required for terminal differentiation of activated B cells to immunoglobulin-secreting cells. Previous studies have shown that a murine T-cell hybrid (B151K12) produces factor(s) that (i) induce immunoglobulin secretion by the B-cell leukemia line BCL1 and secondary anti-2,4-dinitrophenyl IgG synthesis in vitro by dinitrophenyl-primed B cells (TRF activity) and (ii) cause proliferation of the BCL1 cells [B-cell growth factor II (BCGF-II) activity]. Both activities appear to be associated with the same molecule. Here we report the production of a monoclonal antibody to murine TRF. The monoclonal antibody, designated TB13, strongly inhibited both TRF and BCGF-II activities and absorbed TRF- as well as BCGF-II-active molecules produced by B151K12 and by Xenopus oocytes that had been injected with mRNA transcribed from plasmid pSP6K-mTRF23. Inhibition was linearly dependent on the concentration of both TB13 and TRF. Monoclonal antibody TB13 did not inhibit the activities of B-cell stimulatory factor 1, interleukin 1, interleukin 2, or interleukin 3. TRF activity in dissolved samples of immunoprecipitates obtained with TB13 was recovered after NaDodSO4/PAGE, in the fractions corresponding to a protein band at Mr 46,000. Our results indicate that monoclonal antibody TB13 recognizes a molecule that has both TRF and BCGF-II activities.
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