Human leukocyte antigen DP receptor (HLA-DP)

Human leukocyte antigen DP (HLA-DP) is a member of the MHC class II family, functioning as a heterodimeric receptor composed of an alpha (DPA1) and a beta (DPB1) chain (UniProt: P20036, P04440). It is primarily expressed on the surface of professional antigen-presenting cells, including dendritic cells, B cells, and macrophages (NCBI Gene: 3113). The fundamental biological role of HLA-DP is to bind exogenous peptides and present them to CD4+ T cells, thereby triggering the adaptive immune response. Genetic polymorphisms in the HLA-DPB1 gene are significantly associated with susceptibility to chronic Hepatitis B infection and the development of autoimmune conditions like sarcoidosis (Thomas et al., 2014, Nature Genetics). In clinical transplantation, HLA-DP mismatching is a critical factor in the development of graft-versus-host disease (GVHD) and transplant rejection (Fleischhauer et al., 2012, Blood). While few drugs target HLA-DP exclusively, it is a major focus of immunosuppressive therapy and experimental monoclonal antibodies designed to modulate T-cell mediated immunity. Effective targeting of HLA-DP requires precision to avoid broad-spectrum immune deficiency while managing specific inflammatory or alloimmune responses.

Other names

MHC class II antigen DPHLA-DP1DP alpha/beta heterodimerMajor histocompatibility complex, class II, DPHLA-DPA1/HLA-DPB1 complex

Modulation of T-cell activation by interfering with the MHC-peptide-TCR complex interaction or depleting antigen-presenting cells expressing the receptor.