Background: MicroRNA-155 (miR-155) is upregulated during T cell activation, but the exact mechanisms by which it influences CD4+ T cell activation remain unclear. Objective: To examine whether the B and T lymphocyte attenuator (BTLA) is a target of miR-155 during naïve CD4+ T cell activation. Methods: Firefly luciferase reporter plasmids pEZX-MT01-wild-type-BTLA and pEZX-MT01-mutant-BTLA were ...

Naive peripheral B cells are maintained in sufficient numbers and diversity to mount effective immune responses against infectious agents. However, the size and repertoire of this B cell pool is constantly diminished by normal cell turnover and Ag activation. Homeostatic (Ag-independent) proliferation in response to B cell depletion is one mechanism to compensate for this cell loss. We have use...

Background: Pemphigus vulgaris, the most common form of pemphigus, is due to the production of auto-antibodies directed against adhesion molecules (desmoglein 1 and 3) that belong to the cadherin family. B cell-activating factor of the TNF family (BAFF) and a proliferation-inducing ligand (APRIL) may play a significant role in autoimmune diseases such as pemphigus vulgaris. Only a few studies h...

CD40 signaling in B cells and dendritic cells (DCs) is critical for the development of humoral and cell-mediated immunity, respectively. Nuclear factor k B (NFk B)–inducing kinase (NIK) has been implicated as a central transducing kinase in CD40-dependent activation. Here, we show that although NIK is essential for B cell activation, it is dispensable for activation of DCs. Such data provide co...

Background : Propylene glycol (1,2-propanediol, PG) is a commonly used solvent for oral, intravenous, as well as topical pharmaceutical preparations. While PG is generally considered to be safe, it has been known that large intravenous doses given over a short period of time can be toxic. Objective: To evaluate the effect of PG in sepsis induced by the bacterial endotoxin lipopolysaccharide (LP...

The use of anti-Ig antibodies to stimulate polyclonal proliferation through Ig receptors expressed on the B cell membrane has been a popular model for antigendriven B cell activation (1-7). Initially it was proposed that anti-Ig-induced proliferation proceeded independently of T cells and other accessory ceils, as vigorous depletion of such cell types failed to prevent activation (3, 8). Howeve...