Article (Scientific journals)
Prostaglandin E2 induces the expression of functional inhibitory CD94/NKG2A receptors in human CD8+ T lymphocytes by a cAMP-dependent protein kinase A type I pathway.
Zeddou, Mustapha; Greimers, Roland; de Valensart, Nicolas et al.
2005In Biochemical Pharmacology, 70 (5), p. 714-24
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Keywords :
Antigens, CD/biosynthesis/genetics/physiology; Antigens, CD94; CD8-Positive T-Lymphocytes/metabolism; Cyclic AMP/analogs & derivatives/pharmacology/physiology; Cyclic AMP-Dependent Protein Kinases/physiology; Dinoprostone/pharmacology; Humans; Lectins, C-Type/biosynthesis/genetics/physiology; RNA, Messenger/analysis; Receptors, Immunologic/biosynthesis/genetics/physiology; Thionucleotides/pharmacology
Abstract :
[en] The CD94/NKG2A heterodimer is a natural killer receptor (NKR), which inhibits cell-mediated cytotoxicity upon interaction with MHC class I gene products. It is expressed by NK cells and by a small fraction of activated T cells, predominantly of CD8+ phenotype. Abnormal upregulation of the CD94/NKG2A inhibitory NKR on cytotoxic T cells (CTLs) could be responsible for a failure of immunosurveillance in cancer or HIV infection. In an attempt to identify the mechanisms leading to inhibitory NKR upregulation on T cells, we analyzed the expression of the CD94/NKG2A heterodimer on human CTLs activated with anti-CD3 mAb in the presence of PGE2 or with 8-CPT-cAMP, an analogue of cyclic AMP. As previously described, anti-CD3 mAb-mediated activation induced the expression of CD94/NKG2A on a small fraction of CD8+ T cells. Interestingly, when low concentrations of PGE2 or 8-CPT-cAMP were present during the culture, the proportion of CD8+ T cells expressing CD94/NKG2A was two- to five-fold higher. This upregulation was partially prevented by PKA inhibitors, such as KT5720 and Rp-8-Br-cAMP (type I selective). We also report that cAMP induces upregulation of NKG2A at the mRNA level. We further demonstrated that cross-linking of CD94 on CD8+ T cells expressing the CD94/NKG2A heterodimer inhibits their cytotoxic activity in a bispecific antibody redirected lysis assay. Our findings clearly demonstrate that the PGE2/cAMP/PKA type I axis is involved in the expression of CD94/NKG2A receptor on human CD8+ T lymphocytes.
Disciplines :
Immunology & infectious disease
Author, co-author :
Zeddou, Mustapha ;  Université de Liège - ULiège > Département des sciences cliniques > Hématologie
Greimers, Roland ;  Centre Hospitalier Universitaire de Liège - CHU > Anatomie pathologique
de Valensart, Nicolas
Nayjib, Btissam 
Tasken, Kjetil
Boniver, Jacques ;  Centre Hospitalier Universitaire de Liège - CHU > Anatomie pathologique
Moutschen, Michel  ;  Centre Hospitalier Universitaire de Liège - CHU > Maladies infectieuses et médecine interne générale
Rahmouni, Souad  ;  Université de Liège - ULiège > Département des sciences cliniques > Immunopathologie - Transplantation
Language :
English
Title :
Prostaglandin E2 induces the expression of functional inhibitory CD94/NKG2A receptors in human CD8+ T lymphocytes by a cAMP-dependent protein kinase A type I pathway.
Publication date :
2005
Journal title :
Biochemical Pharmacology
ISSN :
0006-2952
eISSN :
1873-2968
Publisher :
Elsevier Science, Oxford, United Kingdom
Volume :
70
Issue :
5
Pages :
714-24
Peer reviewed :
Peer Reviewed verified by ORBi
Available on ORBi :
since 27 January 2009

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