Accordingly, patients have been classified depending on their number of naive, memory and switched-memory

B cells [8, 9]. Furthermore, a low percentage of memory B cells in CVID patients has been associated with a worse clinical presentation and poor response to Selleck AZD1152 HQPA vaccines [10-12]. Loss of memory B cells also occurs from the onset of acute HIV infection. Recently, low frequencies of CD27+ memory B cells and decreased production of antibodies have been described in successfully treated HIV patients in spite of drug-suppressed viraemia. Surface expression levels of TNF-related apoptosis-inducing ligand (TRAIL) on memory B cells correlated negatively with their peripheral blood frequency [13]. The generation of memory B cells and plasma cells is essential to establish efficient humoral immune responses. Co-operation of B cell receptor (BCR)-activated B cells with helper T cells is relevant and occurs through contact between T cell membrane molecules (CD40L, ICOS, etc.) and their corresponding B cell ligands [14]. The importance of several of these components of the immune system has been exemplified by naturally occurring immunodeficiencies [15]. Furthermore, secretion of cytokines by T cells also instruct the differentiation of B cells, selleck kinase inhibitor including interleukin (IL)-21 as one of the more potent cytokines

for human B cell proliferation and differentiation [16-20]. Following antigenic stimulation, Toll-like receptor (TLR) can provide an additional signal for the differentiation of B cells and even substitute T cell-derived signals [21, 22]. Apart from their effect on proliferation and differentiation, several of these stimuli also influence B cell survival. BCR activation has been shown to induce B cell apoptosis in the absence of survival signals such as that provided through CD40. Mainly produced by activated CD4+ follicular T cells [19, 23, 24], IL-21 is a type I cytokine that belongs to a family that uses the

common cytokine receptor γ-chain as a component of their receptors [25, 26]. The stimulatory or inhibitory effect of IL-21 L-gulonolactone oxidase depends on the maturation and activation status of the B cell, the co-stimulatory accompanying signal and the presence of other cytokines. In humans, IL-21 is a potent inductor of plasma cell differentiation if combined with anti-CD40 [16], induces class-switch recombination and secretion of immunoglobulin (Ig)G and IgA in pre-switched IgM memory B cells [19, 27] and is able to induce plasma cell differentiation and immunoglobulin production even by naive B cells [16]. However, IL-21 triggers B cell death when BCR is ligated [16, 28]. A balance between apoptosis-inducing and survival signals must exist to preserve B cell homeostasis.