Naïve mature B cells

Definition

Naïve mature B cells are immune cells that have completed development in the bone marrow but have not yet encountered their specific antigen. They circulate in the peripheral lymphoid organs, ready to initiate an immune response upon antigen exposure.

5 Must Know Facts For Your Next Test

1. Naïve mature B cells express both IgM and IgD on their surface as part of their B cell receptor (BCR) complex.
2. They reside primarily in secondary lymphoid organs like the spleen and lymph nodes, where they encounter antigens.
3. Upon encountering an antigen, naïve mature B cells differentiate into either plasma cells that produce antibodies or memory B cells for long-term immunity.
4. These cells are crucial for initiating the primary adaptive immune response upon first exposure to a pathogen.
5. The activation of naïve mature B cells requires help from T helper (Th) cells through cytokine signaling and direct cell-to-cell contact.

Related terms

Plasma Cells:

Antibody-producing descendants of activated B cells.

Memory B Cells:

Long-lived descendants of activated B cells that provide rapid responses upon re-exposure to an antigen.

T Helper Cells: A subset of T lymphocytes essential for activating and directing other immune cells, including naïve mature B cells.