How are B cells and antibodies presented with antigen?
The interface between an antigen-presenting cell and a lymphocyte. The engagement of B cell receptors by surface-tethered antigens leads to the formation of an immunological synapse that coordinates cell signalling events and that promotes antigen uptake for presentation on MHC class II molecules.
What antibodies does B lymphocytes produce?
Lymphocytes are one of the main types of immune cells. Lymphocytes are divided mainly into B and T cells. B lymphocytes produce antibodies – proteins (gamma globulins) that recognize foreign substances (antigen) and attach themselves to them. B lymphocytes (or B cells) are each programmed to make one specific antibody.
How do B lymphocytes respond to antigens?
B cells have B cell receptors (BCRs) on their surface, which they use to bind to a specific protein. Once the B cells bind to this protein, called an antigen, they release antibodies that stick to the antigen and prevent it from harming the body. Then, the B cells secrete cytokines to attract other immune cells.
How do B cells present antigens?
The presentation of antigens by B cells on MHC class II molecules is a complex process that involves several stages: first, external antigens are recognized and captured by B cells through their B cell receptor (BCR); second, the antigen is processed by degrading the antigen in internal compartments within the B cell …
How do B cells create antibodies?
Antibodies are produced by specialized white blood cells called B lymphocytes (or B cells). When an antigen binds to the B-cell surface, it stimulates the B cell to divide and mature into a group of identical cells called a clone. Antibodies attack antigens by binding to them.
Where do lymphocytes develop and mature?
Both originate from stem cells in the bone marrow and are initially similar in appearance. Some lymphocytes migrate to the thymus, where they mature into T cells; others remain in the bone marrow, where—in humans—they develop into B cells.
How is antigen recognized by B and T lymphocytes and how do the cells become activated?
T and B cells exhibit a common theme of recognition/binding of specific antigens via a complementary receptor, followed by activation and self-amplification/maturation to specifically bind to the particular antigen of the infecting pathogen.
