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Preparation And Storage
Recommended Assay Procedures
BD™ CompBeads can be used as surrogates to assess fluorescence spillover (Compensation). When fluorochrome conjugated antibodies are bound to BD CompBeads, they have spectral properties very similar to cells. However, for some fluorochromes there can be small differences in spectral emissions compared to cells, resulting in spillover values that differ when compared to biological controls. It is strongly recommended that when using a reagent for the first time, users compare the spillover on cells and BD CompBead to ensure that BD CompBeads are appropriate for your specific cellular application.
Product Notices
- Researchers should determine the optimal concentration of this reagent for their individual applications.
- The production process underwent stringent testing and validation to assure that it generates a high-quality conjugate with consistent performance and specific binding activity. However, verification testing has not been performed on all conjugate lots.
- An isotype control should be used at the same concentration as the antibody of interest.
- Caution: Sodium azide yields highly toxic hydrazoic acid under acidic conditions. Dilute azide compounds in running water before discarding to avoid accumulation of potentially explosive deposits in plumbing.
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Companion Products
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Neurite adhesion molecule L1 has been implicated in neuron-neuron and neuron-Schwann cell adhesion in vertebrates. L1-like molecules, found in mouse, rat, chicken, and human, promote axonal elongation and may also play a role in regeneration of axons after injury. Molecular cloning data suggest 87% amino acid identity between mouse and human L1 molecules. 5G3 antigen (Ag), originally defined by monoclonal antibody 5G3, is considered to be the human homologue of mouse L1. The 5G3 antibody was developed against a human neuroblastoma cell line to use as a probe for the elucidating the biological characteristics of neuroblastoma. 5G3 specifically recognizes a neuroblastoma target glycoprotein antigen of 215 kDa and its 200 kDa precursor. The 215 kDa molecule is expressed on the cell surface; whereas the 200 kDa precursor is shed from the cell surface. The 215 and 200 kDa species also differ in their posttranslational modification patterns. The 5G3 antibody has been used as a marker for neuroblastoma, and to purify 5G3 Ag from normal adult human brain.
The antibody recognizes human L1 on human neuroblastoma cell lines and tissues. Reactivity has been tested on a variety of malignant and normal tissues. Squamous lung, squamous skin, and osteogenic sarcoma cell lines were positive, as were two out of eight melanoma cell lines tested. A variety of other cell lines and tumor tissues tested negative. 5G3 did not react with either T or B lymphoblastoid cell lines or a fibroblast cell line. Among all the normal tissues tested, mAb 5G3 reacted only with cerebellum.
The molecular masses observed using mAb 5G3 may vary among immunoprecipitation isolates. In normal human cerebellum, 5G3 Ag migrated as a 190/200 kDa doublet, 140 kDa band with minor bands at 80 and 65 kDa. 5G3 Ag isolated from SK-N-AS cells migrates as 200 to 215 kDa bands, or as a diffuse band ranging from 200 to 215 kDa. Additional bands have been described at 140 to 150 kDa in SK-N-AS cells. Only the 200 kDa band has been detected in culture media from SK-N-AS cells.
The antibody was conjugated to BD Horizon Red 718, which has been developed exclusively for BD Biosciences as a better alternative to Alexa Fluor® 700. BD Horizon Red 718 can be excited by the red laser (628 – 640 nm) and, with an Em Max around 718 nm, it can be detected using a 730/45 nm filter. Due to similar excitation and emission properties, we do not recommend using R718 in combination with APC-R700 or Alexa Fluor® 700.
Development References (12)
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Mechtersheimer S, Gutwein P, Agmon-Levin N, et al. Ectodomain shedding of L1 adhesion molecule promotes cell migration by autocrine binding to integrins. J Cell Biol. 2001; 155(4):661-673. (Clone-specific: Western blot). View Reference
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Mujoo K, Spiro RC, Reisfeld RA. Characterization of a unique glycoprotein antigen expressed on the surface of human neuroblastoma cells. J Biol Chem. 1986; 261(22):10299-10305. (Immunogen: Immunofluorescence, Immunohistochemistry, Western blot). View Reference
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Nayeem N, Silletti S, Yang X, et al. A potential role for the plasmin(ogen) system in the posttranslational cleavage of the neural cell adhesion molecule L1. J Cell Sci. 1999; 112(24):4739-4749. (Clone-specific: Western blot). View Reference
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Pancook JD, Reisfeld RA, Varki N, Vitiello A, Fox RI, Montgomery AM. Expression and regulation of the neural cell adhesion molecule L1 on human cells of myelomonocytic and lymphoid origin.. J Immunol. 1997; 158(9):4413-21. (Clone-specific). View Reference
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Rathjen FG, Schachner M. Immunocytological and biochemical characterization of a new neuronal cell surface component (L1 antigen) which is involved in cell adhesion. EMBO J. 1984; 3(1):1-10. (Biology). View Reference
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Rathjen FG, Wolff JM, Chang S, Bonhoeffer F, Raper JA. Neurofascin: a novel chick cell-surface glycoprotein involved in neurite-neurite interactions. Cell. 1987; 51(5):841-849. (Biology). View Reference
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Reid RA, Hemperly JJ. Variants of human L1 cell adhesion molecule arise through alternate splicing of RNA. J Mol Neurosci. 1992; 3(3):127-135. (Biology). View Reference
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Salton SR, Shelanski ML, Greene LA. Biochemical properties of the nerve growth factor-inducible large external (NILE) glycoprotein. J Neurosci. 1983; 3(12):2420-2430. (Biology). View Reference
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Wolff JM, Frank R, Mujoo K, Spiro RC, Reisfeld RA, Rathjen FG. A human brain glycoprotein related to the mouse cell adhesion molecule L1.. J Biol Chem. 1988; 263(24):11943-7. (Clone-specific: Immunoaffinity chromatography). View Reference
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Wolff R, Plow EF, Ginsberg MH. Interaction of thrombospondin with resting and stimulated human platelets. J Biol Chem. 1986; 261(15):6840-6846. (Clone-specific: Western blot). View Reference
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For Research Use Only. Not for use in diagnostic or therapeutic procedures.
