MON-160 is a mouse monoclonal IgG1 antibody derived by fusion of mouse myeloma cells with spleen cells from a mouse immunized with a partially purified bacterially expressed Reticulon-1A (NSP-A) hybrid protein (beta-GAL-NSP-A 6-776 ).
MON-160 exclusively recognizes the 135 kD Reticulon-1A protein in immunoblots of NCI-H82 and other SCLC cell lines, and stains normal and pathological neural and neuroendocrine tissues. The epitope of MON-160 is located between amino acid residues 174-337 of Reticulon-1A. MON-160 is useful for immunocytochemistry, immunohistochemistry on frozen and paraffin-embedded tissue, immunoblotting and flow cytometry. Optimal antibody dilution should be determined by titration, recommended range is 1:50 - 1:100 for flow cytometry, and for immunohistochemistry with avidin-biotinylated horseradish peroxidase complex (ABC) as detection reagent, and 1:50 - 1:500 for immunoblotting applications.
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Senden, Timmer, de Bruïne, Wagenaar, Van de Velde, Roebroek, Van de Ven, Broers, Ramaekers: "A comparison of NSP-reticulons with conventional neuroendocrine markers in immunophenotyping of lung cancers." in: The Journal of pathology, Vol. 182, Issue 1, pp. 13-21, (1997) (PubMed).
van de Velde, Roebroek, Senden, Ramaekers, Van de Ven: "NSP-encoded reticulons, neuroendocrine proteins of a novel gene family associated with membranes of the endoplasmic reticulum." in: Journal of cell science, Vol. 107 ( Pt 9), pp. 2403-16, (1995) (PubMed).
van de Velde, Senden, Roskams, Broers, Ramaekers, Roebroek, Van de Ven: "NSP-encoded reticulons are neuroendocrine markers of a novel category in human lung cancer diagnosis." in: Cancer research, Vol. 54, Issue 17, pp. 4769-76, (1994) (PubMed).
van de Velde, Roebroek, van Leeuwen, Van de Ven: "Molecular analysis of expression in rat brain of NSP-A, a novel neuroendocrine-specific protein of the endoplasmic reticulum." in: Brain research. Molecular brain research, Vol. 23, Issue 1-2, pp. 81-92, (1994) (PubMed).
Roebroek, van de Velde, Van Bokhoven, Broers, Ramaekers, Van de Ven: "Cloning and expression of alternative transcripts of a novel neuroendocrine-specific gene and identification of its 135-kDa translational product." in: The Journal of biological chemistry, Vol. 268, Issue 18, pp. 13439-47, (1993) (PubMed).
Recently, a novel gene family has been identified and characterized, designated the Reticulons because the proteins encoded by these genes are anchored to the membranes of the endoplasmic reticulum. Reticulon-1 was formerly designated NSP for Neuroendocrine-Specific-Protein, because it is specifically expressed in neural and neuroendocrine tissues. The NSP-gene has been mapped by fluorescence in situ hybridization to human chromosome 14q21-q22. The NSP-gene encodes three overlapping proteins, i.e. Reticulon-1A (NSP-A), Reticulon-1B (NSP-B), and Reticulon-1C (NSP-C). These proteins were found to be anchored to membranes of the endoplasmic reticulum through their common carboxy-terminal regions. Reticulon-1A is a protein with a molecular weight (MW) of about 135 kDa, which occurs in various isoforms presumably depending on the degree of phosphorylation of serine residues. In lung cancer diagnosis Reticulon-1A appeared to be a reliable marker for the detection of neuroendocrine differentiation, since most of the small cell lung carcinoma (SCLC) and carcinoid tumors showed expression of Reticulon-1A. Reticulon-1B is a phosphoprotein with a MW of 45 kDa and is restricted to the lung cancer cell line NCI-H82. Reticulon-1B is sofar not found in human tissues. Reticulon-1C is a protein with a MW of 23 kDa which is not phosphorylated and is found with Reticulon-1A in SCLC (cell lines) and not in non-SCLC (cell cultures).