OX-2 membrane glycoprotein, also named CD200 (Cluster of Differentiation 200) [5] is a human protein encoded by the CD200 gene. [6] In humans, the CD200 gene is located on chromosome 3 in proximity to genes encoding the other B7 proteins CD80 / CD86 .

We show that CD200 is uniformly expressed in chronic lymphocytic leukemia (CLL) and absent in mantle cell lymphoma (MCL). Importantly, expression of CD200 is retained even in those CLLs with immunophenotypic aberrancies, making CD200 a particularly useful marker for discrimination between these cases and MCL.

CD200 is a transmembrane protein related to the B7 family of costimulatory receptors involved in T-cell signaling and likely plays a role in physiologic immune tolerance. It is normally expressed on lymphoid and neuronal tissue, and its receptor, CD200R, is expressed on antigen-presenting cells and T-cells.

CD200 is a new marker that was found to be up-regulated in chronic lymphocytic leukemia (CLL)/small lymphocytic lymphoma (SLL) when compared with normal B cells by flow cytometry immunophenotyping [11].

2024年12月24日 · CD200 (CD200 Molecule) is a Protein Coding gene. Diseases associated with CD200 include Hairy Cell Leukemia and Indian Tick Typhus. Among its related pathways are Innate Immune System and Class I MHC mediated antigen processing and presentation. An important paralog of this gene is NECTIN1.

Through this CD200/CD200R signaling pathway, CD200 exerts its immunosuppressive effects by inhibiting natural killer (NK) cell activation, cytotoxic T cell functions, and M1-polarized macrophage activity, while also facilitating expansion of myeloid-derived suppressor cells (MDSCs) and Tregs.

2021年5月12日 · Our data show that the CD200-CD200R pathway restrains activation of CD200R+ lesional macrophages, their production of CCR2 ligands, and monocyte recruitment in vitro and in vivo in an air pouch model.