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Integration of apoptosis and telomere erosion in virus-specific CD8(+) T cells from blood and tonsils during primary infection

Soares, MVD; Plunkett, FJ; Verbeke, CS; Cook, JE; Faint, JM; Belaramani, LL; Fletcher, JM; ... Akbar, AN; + view all (2004) Integration of apoptosis and telomere erosion in virus-specific CD8(+) T cells from blood and tonsils during primary infection. BLOOD , 103 (1) 162 - 167. 10.1182/blood-2003-06-1791.

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Abstract

Human-virus-specific CD8(+) T cells that are found during primary infection have been studied almost exclusively in the peripheral blood, and it is unclear whether these cells are regulated in the same way as those in secondary lymphoid tissue. We investigated, therefore, the control of apoptosis and telomere erosion of Epstein-Barr virus (EBV)-specific CD8(+) T cells found in the blood and tonsils of the same patients during acute infectious mononucleosis (AIM). Although the clonal composition of CD8(+) T cells as determined by heteroduplex analysis was similar in both compartments, there was greater CD28 expression in the tonsil population, indicating that they were less differentiated. EBV-specific CD8(+) T cells in both tissue types were extremely susceptible to apoptosis related to low Bcl-2 expression and were dependent on exogenous cytokines such as interieukin-2 (IL-2), IL-15, and interferon-alpha/beta (IFN-alpha/beta) for survival. In both compartments, however, these cells maintained their telomere lengths through telomerase induction. Thus, apoptosis-prone EBV-specific CD8(+) T cells found during acute infection have to be rescued from death to persist as a memory population. However, signals that induce telomerase ensure that the rescued cells retain their replicative capacity. Significantly, these processes operate identically in cells found in blood and secondary lymphoid tissue.

Type: Article
Title: Integration of apoptosis and telomere erosion in virus-specific CD8(+) T cells from blood and tonsils during primary infection
DOI: 10.1182/blood-2003-06-1791
Keywords: FLOW CYTOMETRIC ANALYSIS, REPLICATIVE SENESCENCE, REVERSE-TRANSCRIPTASE, VIRAL-INFECTIONS, PERSISTENT VIRUS, MEMORY CELLS, EXPRESSION, ANTIGEN, LENGTH, LYMPHOCYTES
UCL classification: UCL > Provost and Vice Provost Offices
UCL > Provost and Vice Provost Offices > School of Life and Medical Sciences
UCL > Provost and Vice Provost Offices > School of Life and Medical Sciences > Faculty of Medical Sciences
UCL > Provost and Vice Provost Offices > School of Life and Medical Sciences > Faculty of Medical Sciences > Cancer Institute
UCL > Provost and Vice Provost Offices > School of Life and Medical Sciences > Faculty of Medical Sciences > Cancer Institute > Research Department of Oncology
UCL > Provost and Vice Provost Offices > School of Life and Medical Sciences > Faculty of Medical Sciences > Div of Infection and Immunity
URI: http://discovery.ucl.ac.uk/id/eprint/150598
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