The B cell-stimulating molecules, BAFF (B cell activating factor, also known as BLyS; TALL-1; CD257 or TNFSF13B) and APRIL (a proliferation-inducing ligand, also known as CD256 or TNFSF13), are critical factors in the maintenance of the B cell pool and humoral immunity.
APRIL maintains B cell homeostasis by acting at a later stage, modulating the function and survival of antigen-experienced B cells. BAFF is a key survival factor for peripheral B cells and together with IL-6 plasma cell differentiation. APRIL (as well as BAFF) stimulates class-switch recombination (CSR), hence contributes to shaping humoral effector mechanisms. With regards to humoral memory, APRIL is involved in the establishment and survival of the long-lived plasma cell (LLPC) pool in the bone marrow (BM). Besides its major role in B cell biology, BAFF co-stimulates activated T cells.
BAFF and APRIL are implicated in several human autoimmune diseases with autoreactive B cell involvement, including systemic lupus erythematosus (SLE), Sjögren’s syndrome (SS), IgA nephropathy (IgAN), and rheumatoid arthritis (RA). ). APRIL might also function in enhancing proliferation of some tumor cells, especially B cell malignancies. BAFF levels are also increased in some lymphoid cancers.
The APRIL (human) ELISA Kit (Prod. No. AG-45B-0012) is a sandwich ELISA for specific quantitative determination of human APRIL in serum, plasma and cell culture supernatants. This ELISA Kit shows both high specificity and high sensitivity, which is a clear advantage compared to other APRIL (human) ELISA Kits from key competitors, such as eBioscience or Biolegend.
The BAFF, Soluble (human) ELISA Kit (Prod. No. AG-45B-0001) is a sandwich ELISA for specific quantitative determination of human BAFF in serum, plasma and cell culture supernatants. This ELISA Kit does not cross-react with mouse BAFF and has been chosen by several CROs for its high specificity and high sensitivity.
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