International Immunology Advance Access originally published online on February 21, 2005
International Immunology 2005 17(4):383-390; doi:10.1093/intimm/dxh218
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CD27+ (memory) B cell decrease and apoptosis-resistant CD27– (naive) B cell increase in aged humans: implications for age-related peripheral B cell developmental disturbances
1 Department of General Medicine, Kyushu University Hospital, Fukuoka, Japan
2 Department of Clinical Research, Hara-Doi Hospital, 6-40-8 Aoba, Higashi-ku, Fukuoka 813-8588, Japan
3 Fukuoka Red Cross Blood Center, Fukuoka, Japan
4 Department of Environmental Medicine and Infectious Diseases, Faculty of Medical Sciences, Kyushu University, Fukuoka, Japan
Correspondence to: H. Ikematsu; E-mail: ikematsu{at}gray.plala.or.jp
To investigate age-related alterations in human humoral immunity, we analyzed the quantity and quality of peripheral B cell subsets, CD27-negative (CD27–) and CD27-positive (CD27+) B cells, by flow cytometry analysis in 54 aged individuals (mean age ± SE, 74.6 ± 0.7 years) and 30 young individuals (mean age ± SE, 26.1 ± 0.5 years). CD27– and CD27+ B cells are regarded as naive and memory B cells, respectively. CD38, Ki-67, CD95 and bcl-2 were used as activation, proliferation and apoptotic markers. Susceptibility to apoptosis was evaluated by cell size and annexin-V binding in culture cells. The percentage of CD27+ B cells was significantly lower in aged (mean, 19.2%) individuals than that in young individuals (mean, 28.2%). The opposite was true for CD27– B cells (mean, 80.8% in aged and 71.8% in young) (P < 0.01). The absolute number of CD27+ B cells in aged individuals was significantly less than the number of CD27– B cells. The CD27+ B cells from aged individuals showed little susceptibility to apoptosis, although CD95 expression on the CD27+ B cells was significantly higher in the aged individuals than in the young individuals (P < 0.05). The CD38 and bcl-2 expression on the CD27– B cells was significantly higher in the aged individuals than in the young individuals (P < 0.05). In addition, the CD27– B cells from the aged individuals showed a decreased susceptibility to apoptosis compared with that of the young individuals. These findings suggested that human aging leads to both quantitative and qualitative alterations in the peripheral B cell developmental system, including memory and naive B cell balance and their surface phenotypes.
Keywords: aging, apoptosis, B cells, memory, naive
Transmitting editor: T. Watanabe
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