T-cell dysregulation caused by chronic antigenic stress: the role of CMV in immunosenescence?

Abstract:

:Dysfunctional T-cell immunity contributes to susceptibility to infectious disease in the elderly. A characteristic feature of this "immunosenescence" is the predominance of clonal expansions of CD8 cells and decreased diversity of the T-cell antigen receptor repertoire. Lifelong chronic antigenic stress commonly caused by infection with persistent activating herpes viruses causes the accumulation of anergic, apoptosis-resistant CD8 T cells. These dysfunctional cells are indirectly immunosuppressive by tasking up the "immunological space" as well as directly suppressive via blockade of antigen presenting cells or cytokine secretion. They are associated with an emerging "immunological risk profile" predicting mortality in longitudinal studies of very old people. It is therefore hypothesized that for that majority of elderly people infected with cytomegalovirus (CMV), which seems to act as the dominant chronic stressor, anti-viral strategies would be of benefit in abrogating some of the detrimental clinical manifestations of immunosenescence.

journal_name

Aging Clin Exp Res

authors

Pawelec G,Gouttefangeas C

doi

10.1007/BF03327436

subject

Has Abstract

pub_date

2006-04-01 00:00:00

pages

171-3

issue

2

eissn

1594-0667

issn

1720-8319

pii

1814

journal_volume

18

pub_type

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