Abstract:
:Immunoenzymatic assays were developed for the measurement of antibodies against mycobacterial lipoarabinomannan (LAM), a cell-free proteic extract (CFX) of Mycobacterium leprae, and the 38-kD protein antigen of M. tuberculosis. Sera from 108 leprosy patients, belonging to all clinical-immunological forms of the spectrum, and 81 patients with localized or disseminated tuberculosis (TB) were tested for antibodies of the four IgG subclasses. Standard calibration curves were used to allow comparisons between results of different isotypes and specificities. Mean concentrations of total IgG antibodies were higher in the overall leprosy population than in TB patients. In leprosy, levels of anti-CFX increased from tuberculoid toward lepromatous forms, with a clear switch from IgG1 to IgG2 subclass predominance. A similar IgG1 to IgG2 conversion was observed in anti-LAM antibodies, although total levels of anti-LAM were similar in patients with tuberculoid and lepromatous forms. In TB, antibodies against polysaccharide and protein antigens were both predominantly of IgG1 subclass, whatever the patient's clinical status, although lower in disseminated forms, probably due to concomitant HIV infection. A hypergammaglobulinaemia was also found in most leprosy and TB patients. In TB this was due to increased IgG1 and IgG3, especially in HIV co-infected patients. Based on the current knowledge of the influence of T cell-secreted cytokines on human immunoglobulin isotype expression, these results do not fit with a putative role of Th1 (such as found in TB and tuberculoid leprosy (TT)) and Th2 (such as found in leprosy lepromatous (LL) leprosy) environment in the isotypy of antibody responses in mycobacterial infections. Nor do variations of isotypy according to pathological conditions seem to be related to the biochemical nature of antigens, since antibodies to LAM and protein antigens had comparable evolutions of their subclass distribution. Other factors are to be investigated in order to understand better the significance and possible roles of antibodies in mycobacterial diseases.
journal_name
Clin Exp Immunoljournal_title
Clinical and experimental immunologyauthors
Sousa AO,Henry S,Marója FM,Lee FK,Brum L,Singh M,Lagrange PH,Aucouturier Pdoi
10.1046/j.1365-2249.1998.00452.xsubject
Has Abstractpub_date
1998-01-01 00:00:00pages
48-55issue
1eissn
0009-9104issn
1365-2249journal_volume
111pub_type
杂志文章abstract::Monocyte functions were studied in 16 patients with Hodgkin's disease, 11 untreated and five in unmaintained complete remission. Eleven untreated patients with non-Hodgkin's lymphomas and 21 healthy persons were used as controls. Monocytes were isolated from peripheral blood and enriched to greater than 90%. Lymphoma ...
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journal_title:Clinical and experimental immunology
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journal_title:Clinical and experimental immunology
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journal_title:Clinical and experimental immunology
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pub_type: 杂志文章
doi:10.1111/j.1365-2249.1990.tb08113.x
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journal_title:Clinical and experimental immunology
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journal_title:Clinical and experimental immunology
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doi:
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journal_title:Clinical and experimental immunology
pub_type: 杂志文章
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journal_title:Clinical and experimental immunology
pub_type: 杂志文章
doi:
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journal_title:Clinical and experimental immunology
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journal_title:Clinical and experimental immunology
pub_type: 杂志文章
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