Antigen-presenting cells (commonly abbreviated to APCs) are a vastly varied group of white blood cells that take part in the immune response by processing antigens to present to T cells, so the latter can recognize the threat and carry a response.
B lymphocytes are immune cells capable of producing antibodies to attack foreign threats (this is called humoral immune response), for this to be possible, B cells need to be previously activated by T-cells.
But B cells can also act as antigen-presenting cells when the antigen is a molecule simple and repetitive in structure, and capable of evoking an immune response without the participation of T cells (T-cell-independent antigen). This response will consist of antibodies production as well.
There are two types of T-cell-independent antigens (TI):
In conclusion, B cells can act as APCs when the antigen is T-cell-independent.
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