In:
Journal of Leukocyte Biology, Oxford University Press (OUP), Vol. 71, No. 5 ( 2002-05-01), p. 791-797
Kurzfassung:
MICA is an HLA-related cell stress-regulated antigen recognized by cytotoxic cells expressing the NKG2D molecule. Although resting lymphocytes do not express MICA, it can be induced on PHA-activated T cells. Here, we demonstrate by Western blot that MICA is induced on allogeneic-activated CD4+ and CD8+ T lymphocytes. Blocking activation with anti-HLA class I, anti-HLA-DR, or anti-CD86 mAb affected the expression of MICA slightly. When T cells were stimulated with anti-CD3 or anti-CD28 mAb plus PMA, a sustained up-regulation of MICA was observed by Western blot, RT-PCR, and flow cytometry. The expression of MICA reached a plateau at day 4 after CD3 engagement and at day 3 after anti-CD28/PMA stimulation. Conversely, the proliferative response reached a peak at day 4. Hence, CD3 or CD28 engagement induces MICA expression on T lymphocytes. This activation-induced expression might participate in NKG2D-mediated cytotoxicity toward activated T cells to maintain homeostasis during an ongoing immune response.
Materialart:
Online-Ressource
ISSN:
0741-5400
,
1938-3673
DOI:
10.1189/jlb.71.5.791
Sprache:
Englisch
Verlag:
Oxford University Press (OUP)
Publikationsdatum:
2002
ZDB Id:
2026833-6
SSG:
12
