CD74 Inhibitors

CD74 Inhibitors constitute a distinct chemical class of compounds designed to selectively target and modulate the activity of the CD74 protein. CD74, also known as the invariant chain (Ii), is a cell surface glycoprotein involved in various cellular processes, primarily associated with the immune system. Structurally, CD74 is composed of several domains, including an extracellular domain and a cytoplasmic tail. Its extracellular domain plays a crucial role in antigen presentation, as it forms a complex with major histocompatibility complex class II (MHC II) molecules within antigen-presenting cells (APCs), such as dendritic cells, macrophages, and B cells. The functions of CD74 in antigen presentation are central to the immune response. CD74 functions as a chaperone protein, escorting MHC II molecules from the endoplasmic reticulum to endosomes, where they can bind and present antigens to T cells. This process is pivotal for the activation of adaptive immune responses, as it allows T cells to recognize antigens associated with MHC II molecules, triggering immune reactions against pathogens or abnormal cells. CD74 Inhibitors are typically designed as small molecules or compounds that can interfere with the interactions between CD74 and MHC II molecules, thereby modulating antigen presentation.