You Searched For: OPTEM

Supplier: Southern Biotechnology

Description: CD5, also known as Lyt-1, is a monomeric type I transmembrane glycoprotein expressed on thymocytes, T lymphocytes, and a subset of B lymphocytes, but not on natural killer (NK) cells. It has been identified as the major ligand of the B-cell antigen CD72. The frequency of CD5+ B cells exhibits strain-dependent variation, and the phenotypic, anatomical, functional, developmental, and pathological characteristics of the CD5+ B cells suggest that they may represent a distinct lineage, known as B-1 cells. Binding of CD5 on the T cell surface can augment alloantigen- or mitogen-induced lymphocyte proliferation and induces increased cytosolic free calcium, IL-2 secretion, and IL-2R expression. It has been proposed that CD5 negatively regulates signal transduction mediated by the T-cell and B-cell receptors.

Catalog Number: (100245-226)

Supplier: Southern Biotechnology

Description: Rabbit Anti-Hamster IgG(H+L)-PE antibody with minimal reactivity to mouse proteins for use in flow cytometry assays.

Catalog Number: (100242-186)

Supplier: Southern Biotechnology

Description: Purified Human IgA Lambda for use as a standard in ELISA.

Supplier: Southern Biotechnology

Description: CD4 is a type I transmembrane glycoprotein expressed on most thymocytes and the helper/inducer subpopulation of mature T lymphocytes of all mouse strains tested. CD4 has also been detected at low density on pluripotent hematopoietic stem cells, bone marrow myeloid precursors, and intrathymic lymphoid precursors. The CD4 antigen functions as a co-receptor, interacting with class II major histocompatability complex (MHC) molecules in the recognition of foreign antigens by T cells. In vivo and in vitro treatment with the GK1.5 monoclonal antibody effectively depletes CD4+ cells. GK1.5 also blocks helper T cell responses to MHC class II antigens, including cytolysis, proliferation, allogeneic B cell help, and release of lymphokines.

Catalog Number: (100242-870)

Supplier: Southern Biotechnology

Description: FITC Anti-Mouse Lambda antibody for use in flow cytometry, immunohistochemistry, and western blotting assays.

Catalog Number: (100245-476)

Supplier: Southern Biotechnology

Description: Chicken CD45 is a transmembrane glycoprotein expressed on all leukocytes. B lineage cells in the bursa of Fabricius express the 215 kDa isoform while T lineage cells bear the 190 kDa variant. These high molecular weight molecules have intrinsic phosphotyrosine phosphatase activity characteristic of mammalian CD45. Levels of CD45 expression detected by the monoclonal antibody LT40 in the avian thymus are heterogeneous with approximately 90% of thymocytes expressing fourfold higher levels of surface CD45 (CD45hi) than do the remaining 10% (CD45low) of thymocytes. The CD45low population contains exclusively thymocytes with the CD3-CD4-CD8low phenotype characteristic of the immediate precursors to the CD3-CD4+CD8+ thymic population which are CD45hi. This shift from low to high levels of surface CD45 expression is concomitant with the transition from CD4-CD8low to CD4+CD8+ and before the expression of CD3. The ability of the monoclonal antibody LT40 to discriminate this CD45low subpopulation provides a suitable marker for the CD3-CD4-CD8low immediate precursors to the CD3-CD4+CD8+ thymocytes.

Supplier: Southern Biotechnology

Description: CD3, a member of the immunoglobulin superfamily of cell surface receptors, is comprised of five invariable chains ranging from 16-28 kDa and is closely associated with the T cell antigen receptor (TCR). CD3 is expressed on 70-80% of normal peripheral blood lymphocytes and on 10-20% of thymocytes. It plays a major role in signaling during antigen recognition, leading to T cell activation. The monoclonal antibody UCHT1 reacts with the 20 kDa ε chain of the CD3/TCR complex.

Catalog Number: (101442-764)

Supplier: Southern Biotechnology

Description: CD45 is the common leukocyte antigen and is expressed on all cells of hematopoietic origin except erythrocytes. CD45 exists as a number of different isoforms which result from alternative RNA splicing of exons 4, 5 and 6. The I3/2.3 monoclonal antibody recognizes a framework epitope present on all CD45 isoforms. The CD45 molecule has been implicated as playing a key role in thymic development and in antigen-driven proliferation of T cells.

Catalog Number: (101442-964)

Supplier: Southern Biotechnology

Description: CD33 is a 67 kDa type I transmembrane glycoprotein and a member of the sialoadhesin family of cell surface receptors. It is absent from pluripotent stem cells but appears on myelomonocytic precursors after CD34. It then continues to be expressed on both the myeloid and monocyte lineages. While it has been reported that CD33 can function as a sialic acid-dependent cell adhesion molecule, cells expressing CD33 require desialylation before they can bind cells bearing the appropriate sialoglycoconjugates. This suggests that inhibitory cis interactions may regulate or block any adhesion function.

Catalog Number: (101442-754)

Supplier: Southern Biotechnology

Description: The IL-2 receptor (IL-2R) exists in three alternative forms made up from the individual components of CD25, CD122, and CD132. CD25 represents the low affinity α chain of the IL-2R, a type I transmembrane glycoprotein containing two CCP domains. It is rich in O-linked carbohydrates and has a short cytoplasmic tail. CD25 is expressed on activated T cells, B cells, NK cells, and monocytes of all mouse strains tested. It is transiently expressed at a low level during B cell development in bone marrow on the CD45R/B220low TdT- sIg- pre-B II and CD45R/B220low TdT- sIgM+sIgD- immature B cells, but not on the CD45R/B220low TdT+ sIg- pro-B/pre-B I stage nor on CD45R/B220high TdT- sIgM+sIgD+ mature B cells. CD25 is expressed at a higher level during very early T-cell development in fetal and adult thymus. The 7D4 monoclonal antibody reacts with an epitope between amino acids 125 and 212 that is distinct from that recognized by the monoclonal antibody 3C7 (SB Cat. No. 1600). While the monoclonal antibody 7D4 does not block the binding of IL-2 to CD25, when used in combination with the monoclonal antibody 3C7 it results in higher levels of inhibition of IL-2-driven proliferation than either of these two monoclonal antibodies alone.

Catalog Number: (100242-508)

Supplier: Southern Biotechnology

Description: Goat Anti-Mouse IgG(H+L)-Biotin antibody with minimal reactivity to human proteins for use in ELISA, flow cytometry, immunohistochemistry / immunocytochemistry, western blotting, and ELISpot assays.

Catalog Number: (100242-264)

Supplier: Southern Biotechnology

Description: Purified Goat Anti-Mouse Ig antibody with minimal reactivity to human proteins for use in ELISA, flow cytometry, immunohistochemistry / immunocytochemistry, western blotting, and ELISpot assays.

Catalog Number: (100241-922)

Supplier: Southern Biotechnology

Description: Mouse IgG2a-PE/CY5 (SPRD) for use as a control in flow cytometry assays.

Catalog Number: (100241-900)

Supplier: Southern Biotechnology

Description: Mouse IgG1-APC for use as a control in flow cytometry assays.

Catalog Number: (100242-002)

Supplier: Southern Biotechnology

Description: Rat IgG-FITC for use as a control in flow cytometry and immunohistochemistry / immunocytochemistry assays.

Catalog Number: (100242-456)

Supplier: Southern Biotechnology

Description: Goat F(ab’)2 Anti-Mouse IgM-PE antibody with minimal reactivity to human proteins for use in flow cytometry assays.