Search results for " Immunologic memory"

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A double-negative (IgD−CD27−) B cell population is increased in the peripheral blood of elderly people

2009

The T cell branch of the immune system has been extensively studied in the elderly and it is known that the elderly have impaired immune function, mainly due to the chronic antigenic load that ultimately causes shrinkage of the T cell repertoire and filling of the immunologic space with memory T cells. In the present paper, we describe the IgD(-)CD27(-) double-negative B cell population which (as we have recently described) is higher in the elderly. Most of these cells were IgG(+). Evaluation of the telomere length and expression of the ABCB1 transporter and anti-apoptotic molecule, Bcl2, shows that they have the markers of memory B cells. We also show that these cells do not act as antigen…

AdultAgingATP Binding Cassette Transporter Subfamily BT cellAntigens CD19B-Lymphocyte Subsetschemical and pharmacologic phenomenaYoung AdultB lymphocyte Immunosenescence IgD CD27 Elderly Immunologic memorymedicineHumansCytotoxic T cellATP Binding Cassette Transporter Subfamily B Member 1IL-2 receptorCD40 AntigensCD154Antigen-presenting cellCells CulturedAgedAged 80 and overSettore MED/04 - Patologia Generalebusiness.industryAge FactorsHLA-DR AntigensImmunoglobulin DMiddle AgedTelomereFlow CytometryAcquired immune systemTumor Necrosis Factor Receptor Superfamily Member 7B-1 cellKi-67 Antigenmedicine.anatomical_structureProto-Oncogene Proteins c-bcl-2ImmunologyB7-1 AntigenbusinessImmunologic MemoryCD80Developmental BiologyMechanisms of Ageing and Development
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