Abstract:
:Cycling lymphocytes may express the enzyme telomerase which is involved in maintenance of telomere length and cell proliferation potential. In CD8(+) T cells freshly isolated from peripheral blood, we found that in vivo cycling cells expressed HLA-DR. Furthermore, CD28-positive cells are known to have longer telomeres than CD28-negative T cells. Therefore we used HLA-DR- and CD28-specific antibodies to sort CD8(+) T cells and measure telomerase activity ex vivo. Relatively high levels of telomerase activity were found in HLA-DR/CD28 double-positive cells. In contrast, HLA-DR-negative and CD28-negative cells had almost no telomerase activity. In summary, HLA-DR expression correlates with proliferation, and CD28 expression with proliferative potential. We have previously identified that ex vivo cytolytic CD8(+) T cells are CD56 (NCAM) positive. Here we show that HLA-DR(+) cells were rarely CD56(+) and vice versa. This demonstrates that telomerase-expressing and cytolytic CD8(+) T cells can be separated on the basis of the cell surface markers HLA-DR and CD56. Thus, activated CD8(+) T cells specialize and exert distinct functions correlating with surface molecule expression.
journal_name
Eur J Immunoljournal_title
European journal of immunologyauthors
Speiser DE,Migliaccio M,Pittet MJ,Valmori D,Liénard D,Lejeune F,Reichenbach P,Guillaume P,Lüscher I,Cerottini JC,Romero Pdoi
10.1002/1521-4141(200102)31:2<459::aid-immu459>3.0keywords:
subject
Has Abstractpub_date
2001-02-01 00:00:00pages
459-66issue
2eissn
0014-2980issn
1521-4141pii
10.1002/1521-4141(200102)31:2<459::AID-IMMU459>3.0journal_volume
31pub_type
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