Cyclooxygenase-2 (COX-2)

Enzyme responsible for the formation from arachidonic acid of prostaglandins and other pro-inflammatory mediators.

TLS Online TPP Program

#Id: 10386

#XL - Q Biochemistry

Presentation of nonpeptide antigens derived from pathogens involves the nonclassical class I–like CD1 molecule

TLS Online TPP Program

#Id: 10387

#XL - Q Biochemistry

Class I presentation requires internal synthesis of virus protein, as shown by the requirement that the target cell be infected by live virus, and by the inhibition of class I presentation observed when protein synthesis was blocked by the inhibitor emetine.

TLS Online TPP Program

#Id: 10388

#XL - Q Biochemistry

Class II presentation can occur with either live or replication-incompetent virus; protein synthesis inhibitors had no effect, indicating that new protein synthesis is not a necessary condition of class II presentation. 

TLS Online TPP Program

#Id: 10389

#XL - Q Biochemistry

Class II, but not class I, presentation is inhibited by treatment of the cells with an agent that blocks endocytic processing within the cell (chloroquine).

TLS Online TPP Program

#Id: 10286

#XL - Q Biochemistry

T cells initiate the adaptive immune response by interacting MHC on antigen-presenting cells that have been exposed to pathogens. 

TLS Online TPP Program

#Id: 10287

#XL - Q Biochemistry

T-Cell - Cells leaving the thymus are functional, mature T cells expressing unique and specific T-cell receptors (TCRs) that are both tolerant to self and restricted to self-MHC.