Dendritic cells,macrophages, B cells
There is no condition known as sea cell rhinitis, but there is seasonal rhinitis. One cell that is presenting in this condition is nasal mucosal antigen-presenting cell, or APC.
Yes. The first signal that a T cell receives from an antigen presenting cell (dendritic cell) is MHC presenting an antigen (foreign peptide). This gives the T cell specificity to this antigen.
Basophils is not Phagocytic
natural killer cells.
monocyte-macrophage
MHC proteins.
Antigen-presenting cells display foreign antigens on the cell surface with the hopes of T cells noticing recognizing these complexes. The cells that do this on a routine basis are called Professional APC's. This group consists of dendritic cells, macrophages, B-cells, and certain activated epithelial cells.
Macrophages ( in the lymph nodes ) act like phagocytes to engulf and digest the pathogen. But they do not fully digest it. They separate out the antigens and incorporate them into a cell surface molecule. This is exposed on the surface of the macrophage, which becomes known as an antigen-presenting cell. Its function is to find the lymphocytes that can neutralise that particular antigen.
T cells receive 3 signals during activation:1. Major Histocompatibility Complex (MHC) presenting an antigen (foreign peptide) to the T cell receptor2. The co-stimulatory signal (B7 on the dendritic cell binding to CD28 on the T cell)The first signal ensures that the T cell is specific for the antigen it has been presented.The T cell cannot be activated without also recieveing the second signal. This is how the T cell checks that it has been presented an antigen by a "professional" antigen presenting cell.3. Cytokines (signalling molecules) are released by the dendritic cell - these cause the differentiation of the T cell
It hangs around in a lymph node until an 'antigen-presenting cell' comes and finds it, and then it starts producing antibodies specifically to 'hunt down' or stick to whatever protein it is that the antigen-presenting cell shows to it. Once it starts producing antibodies, it's then known as a plasma cell. Antigen-presenting cell = phagocytic or 'pacman-like' macrophage or neutrophil that has eaten evil stuff and keeps a trophy of it's kill on its cell surface to wave around like a flag as it returns from the site of an infection back to base camp (AKA: lymph nodes). My apologies for all the battle references, but I imagine the immune system and its functions in a very graphic, very action-movie kind of way. It's just too cool and complex not to.
MACROPHAGES
The first signal required to activate a T cell is MHC(Major Histocompatibility Complex) presenting an antigen(foreign peptide) to the T cell receptor.