The Major Histocompatibility Complex (MHC) class II molecules are essential components of the immune system. They are heterodimeric transmembrane glycoproteins expressed on the surface of antigen-presenting cells (APCs) such as dendritic cells, macrophages, and B cells. These molecules play a crucial role in the presentation of extracellular antigens to CD4+ T cells, initiating immune responses.
MHC class II molecules are encoded by the I-A and I-E subregions of the MHC complex. The I-E molecules are polymorphic and are expressed on the surface of APCs. They are involved in presenting processed antigenic peptides to CD4+ T cells, which is critical for the activation of these T cells and the subsequent immune response.
The M5/114.15.2 monoclonal antibody specifically targets the MHC class II I-E molecules in mice. This antibody is derived from rat and belongs to the IgG2b isotype. It recognizes a polymorphic determinant present on B cells, monocytes, macrophages, dendritic cells, and activated T lymphocytes from mice carrying specific haplotypes (H-2^b, H-2^d, H-2^q, H-2^p, H-2^r, and H-2^u) but not from mice carrying other haplotypes (H-2^s or H-2^f) .
Fluorescein isothiocyanate (FITC) is a fluorescent dye commonly used to label antibodies for flow cytometry and other fluorescence-based assays. The M5/114.15.2 antibody conjugated with FITC allows for the detection and analysis of MHC class II I-E molecules on the surface of cells using flow cytometry. This conjugation enables researchers to study the expression patterns and distribution of these molecules in various cell types and tissues .
The M5/114.15.2 antibody has been widely used in immunological research to study the role of MHC class II molecules in antigen presentation and T cell activation. It has been employed in various applications, including: