INTRATUMORAL ACTIVATION OF CD8-POSITIVE CYTOTOXIC LYMPHOCYTES IN ACQUIRED-IMMUNODEFICIENCY-SYNDROME LYMPHOMAS

被引:7
作者
DEVERGNE, O
RAPHAEL, M
AUTRAN, B
LEGERRAVET, MB
COUMBARAS, J
CREVON, MC
GALANAUD, P
EMILIE, D
机构
[1] HOP PITIE, DEPT HEMATOL, F-75651 PARIS, FRANCE
[2] HOP PITIE, IMMUNOL CELLULAIRE & TISSULAIRE LAB, F-75651 PARIS, FRANCE
关键词
ACQUIRED IMMUNODEFICIENCY SYNDROME; HUMAN IMMUNODEFICIENCY VIRUS; LYMPHOMA; CYTOTOXIC T CELLS; IMMUNE DEFICIENCY;
D O I
10.1016/0046-8177(95)90059-4
中图分类号
R36 [病理学];
学科分类号
100104 ;
摘要
The incidence of lymphomas is unusually high in human immunodeficiency virus (HIV)-infected patients. Because cytotoxic T lymphocytes (CTL) represent a major mechanism of the antitumoral immune response in immunocompetent individuals, we asked whether intratumoral activation of CTL was impaired in acquired immune deficiency syndrome (AIDS) lymphomas. Immunohistochemical experiments showed that in AIDS lymphomas intratumoral CD8-positive T lymphocytes accumulated and expressed the TIA-1 antigen, a marker of cytotoxic cells. Flow cytometry studies and in situ hybridization of lymphomatous tissue confirmed the differentiation of CD8-positive cells in cytotoxic cells and their activation, as assessed by their expression of CD38 and human leukocyte antigen (HLA) DR markers as well as the perforin and granzyme B genes, which code for two molecules involved in target cell killing. On average, perforin-producing cells were as numerous in AIDS lymphomas (5,647 +/- 2,655 cells/cm(2)) as in lymphomas from immunocompetent individuals (3,294 +/- 1,544 cells/cm(2)). The density of activated CD8-positive cells in the 22 AIDS lymphomas tested was not correlated with peripheral CD4-positive cell counts. These results suggest that in AIDS lymphomas the steps of differentiation and activation of cytotoxic CD8-positive cells are not altered by immune deficiency and that they can take place through pathways relatively independent of CD4-positive T lymphocytes. Thus, other mechanisms of immune deficiency should account for the increased frequency of lymphomas in patients with AIDS. Copyright (C) 1995 by W.B. Saunders Company
引用
收藏
页码:284 / 290
页数:7
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