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. 1985 Jul;49(1):104–110. doi: 10.1128/iai.49.1.104-110.1985

Human monoclonal antibodies against Mycobacterium leprae.

T Atlaw, D Kozbor, J C Roder
PMCID: PMC262065  PMID: 2989177

Abstract

Human hybridomas were constructed which produce antibodies against three different extracts of Mycobacterium leprae. A thioguanine-resistant (Thgr), ouabain-resistant (Ouar), human lymphoblastoid cell line, KR-4, was hybridized with Epstein-Barr virus-transformed cell lines from lepromatous leprosy patients with fusion frequencies of greater than 10(-5). Non-Epstein-Barr virus-transformed donor cells fused at much lower rates (less than 2 X 10(-7]. Hybrids were selected in medium containing hypoxanthine aminopterin thymidine and 10(-5) M ouabain. An enzyme-linked immunosorbent assay was used to screen for antibodies against three crude extracts of armadillo-derived M. leprae, including (i) a soluble sonic extract preparation, (ii) sodium dodecyl sulfate extract of insoluble sonicated M. leprae, and (iii) a purified phenolic glycolipid antigen. Of a total of 2,200 final clones screened, 359 were found to secrete antibody which bound to soluble sonic extracts and the sodium dodecyl sulfate extract (6.7 and 9.6%, respectively), whereas 12.5% (21 out of 168) showed positivity to the glycolipid antigen. Four selected hybridomas also reacted with the deacylated derivative of M. leprae phenolic-glycolipid antigen. The specificity of these monoclonal antibodies was partially determined by screening on a panel of crude extracts from four other mycobacteria. Nine clones of 122 showed reactivity to M. leprae only. The predominant immunoglobulin was immunoglobulin M, and quantities up to 10 micrograms/ml were produced. Antibody production by hybrid clones was stable in more than 75% of the clones grown in continuous culture. By comparison, 10,000 Epstein-Barr virus-transformed lymphocyte clones from lepromatous leprosy patients were screened for anti-M. leprae antibody production, and all of the 42 clones that were initially positive in the enzyme-linked immunosorbent assay lost their antibody-producing capabilities within 6 weeks in culture. These results suggest that a combination of Epstein-Barr virus transformation and hybridization may be an optimal method in producing human monoclonal antibodies from leprosy patients.

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Selected References

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