Abstract:
:Transfer of contact sensitivity (CS) responses by immune lymphoid cells was the first finding that distinguished cellular from humoral immunity. CS has remained the most studied T cell reaction in vivo, and is the prototype for a variety of delayed-type hypersensitivity (DTH) responses. DTH in essence is the recruitment of effector alphabeta-T cells out of vessels into peripheral tissues. The T cells then are activated by antigen presenting cells to produce pro-inflammatory cytokines. It has been assumed that the alphabeta-T cells alone are responsible, but recent studies show that three other lymphocyte subsets are involved: CS-inducing NK T cells, CS-initiating B-1 cells, and CS-assisting gammadelta-T cells. Therefore, the effector alphabeta-T cells are essential, but cannot be recruited into the tissues without the local action of IgM antibodies produced by B-1 cells rapidly (1 day) post-immunization. The IgM complexes with the challenge antigen to locally activate complement to lead to vascular activation required for T cell recruitment. This process occurs early (1-2 hours) in the elicitation phase, and is called CS-initiation. The essential CS-inducing NK T cells activate the B-1 cells by producing IL-4 rapidly (1 hour) after immunization, and gammadelta-T cells assist the local inflammatory function of the recruited CS-effector alphabeta-T cells. Thus, four lymphocyte subsets are required for elicitation of responses: CS-inducing NK T cells, CS-initiating B-1 cells, CS-assisting gammadelta-T cells, and finally the CS-effector alphabeta-T cells. Three of these four cell types are present in the immune lymphoid cell population that adoptively transfers CS: B-1 cells, gammadelta-T cells, and the alphabeta-T cells.
journal_name
Clin Exp Immunoljournal_title
Clinical and experimental immunologyauthors
Askenase PWdoi
10.1046/j.1365-2249.2001.01619.xsubject
Has Abstractpub_date
2001-09-01 00:00:00pages
345-50issue
3eissn
0009-9104issn
1365-2249pii
cei1619journal_volume
125pub_type
评论,杂志文章,评审abstract::Clustering activity for neutrophil granulocytes was generated in pooled normal human serum (NHS) by incubation of the serum with preformed IgG aggregates, but not in heat-treated NHS (56 degrees C, 30 min), indicating that the function was complement-dependent. Judging from results of experiments with complement-defic...
journal_title:Clinical and experimental immunology
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