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- W212042313 abstract "Peripheral blood lymphocytes from 105 subjects with different forms of leprosy and healthy contacts of leprosy patients were stimulated in vitro with different preparations of mycobacterial antigens alone or in combination with a suboptimal dose of phytohaemagglutinin (PHA). In nearly all individuals sonicated leprosy bacilli and PHA together gave a lower 3H-thymidine incorporation than did the same dose of PHA alone. There was no difference in the degree of inhibition seen in the different patient groups or the healthy contacts. High doses of whole, washed Mycobacterium leprae, combined with PHA led to an increased thymidine incorporation in borderline tuberculoid leprosy patients who had experienced a reversal reaction, and in healthy contacts with more than 6 months of exposure, while most lepromatous patients and contacts with less than 6 months exposure did not show an augmentation of the PHA-induced thymidine incorporation. The inhibition exerted by sonicated M. leprae was dose-dependent, seen even with very low doses of antigen, and was not due to direct cytotoxicity. M. bovis, strain BCG, was weakly suppressive in combination with PHA, and sonicated M. duvalii had a very marked suppressive effect. There was no correlation between the suppressive effect of M. leprae antigens and the other mycobacteria neither was there any correlation with the responses to the mycobacterial antigens alone. Many lepromatous leprosy patients showed significant suppression of background incorporation with addition of M. leprae antigens. This paper discusses whether the apparent `non-responsiveness' in lepromatous leprosy could be due to active suppressor mechanisms operative in vivo." @default.
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- W212042313 date "1979-06-01" @default.
- W212042313 modified "2023-09-23" @default.
- W212042313 title "In vitro lymphocyte stimulation in leprosy; simultaneous stimulation with Mycobacterium leprae antigens and phytohaemagglutinin." @default.
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