Description: The eBioTB2F antibody reacts with Transforming Growth Factor-beta (TGF-beta), a pleiotropic cytokine, exists in five isoforms, known as TGF-beta1-5. Homologies between isoforms range from 70-80% but no homology exists to TGF-alpha. TGF-beta1 is ubiquitous and the most abundant form found in lymphoid organs, while other isoforms are expressed in a more restricted distribution. The biologically active state of all isoforms are disulfide-linked homodimers. The heat- and acid- stable monomeric subunits have a length of 112 amino acids. The isoforms of TGF-beta arise by proteolytic cleavage of longer precursors; the isoforms are derived from the carboxyterminal ends of these precursors. Isoforms isolated from different species are evolutionarily closely conserved and have sequence identities on the order of 98%. Mature human, porcine, simian, chicken and bovine TGF-beta1 are identical and differ from mouse TGF-beta1 in a single amino acid. TGF-beta1 is produced in very high levels by platelets. Other cellular sources of TGF-beta1 include macrophages, lymphocytes, endothelial cells, chondrocytes, and leukemic cells. TGF-beta1 secretion can be induced by steroids, retinoids, EGF, NGF, vitamin D3, and IL-1. Activities of TGF-beta1 include inhibition of cell growth for inhibitor for normal and transformed epithelial cells, endothelial cells, fibroblasts, neurons, and lymphoid cells and other hematopoietic cell types. TGF-beta1 inhibits the proliferation of T cells and NK cells and down regulates the activities of activated macrophages. TGF-beta1 blocks the anti-tumor activity of IL-2 - bearing lymphokine-activated killer (LAK) cells.
Recently, TGF-beta1 has been found to have a critical role in the development of regulatory T cells. Dendritic cells exposed to tumors have been reported to secrete TGF-beta1 and stimulate expansion of natural T reg cells. Moreover, TGF-beta1 has been shown to act as a costimulatory factor for expression of Foxp3, leading to the differentiation of CD4+CD25+ Treg cells from peripheral CD4+CD25- progeny. TGF-beta-induced regulatory T cells have been termed Ti-Treg.
Applications Reported: This eBioTB2F antibody has been reported for use in ELISA.
Applications Tested: The eBioTB2F antibody has been tested as the capture antibody in a sandwich ELISA for analysis of human and mouse TGF-beta in combination with the detection eBio16TFB (cat. 13-9923) antibody for detection. A suitable range of concentrations of this antibody for ELISA capture is 6-10 µg/mL. A standard curve consisting of doubling dilutions of the recombinant standard over the range of 8000 pg/mL - 60 pg/mL should be included in each ELISA plate.
This antibody recognizes the mature/active form of TGF beta 1 without association with Latency Associated Peptide (LAP). Most samples will require acid-treatment and neutralization to remove LAP from TGF beta 1 prior to evaluation in this assay. Samples should be tested in the assay immediately after acid treatment and neutralization. It is also possible that some serum and plasma samples may contain low levels of immunoreactive TGF beta 1 that has disassociated from LAP. Naturally occurring, free TGF beta 1 may be measurable by evaluating samples without acid treatment.
Purity: Greater than 90%, as determined by SDS-PAGE.
Aggregation: Less than 10%, as determined by HPLC.
Filtration: 0.2 µm post-manufacturing filtered.
TGF-beta1, -2, and -3 are a closely related group of proteins (70-80% sequence homology) that are produced by many cell types and function as growth and differentiation factors. The active forms of TGF-beta1, -2, and -3 are disulfide-linked homodimers.
For Research Use Only. Not for use in diagnostic procedures. Not for resale without express authorization.
Protein Aliases: LAP; Latency-associated peptide; prepro-transforming growth factor beta-1; tgf beta 1; tgf beta 3; tgf beta1; TGF-beta-1; Transforming growth factor; Transforming growth factor beta-1; Transforming growth factor beta-1 proprotein
Gene Aliases: CED; DPD1; LAP; TGFB; TGFB1; TGFbeta
UniProt ID: (Human) P01137
Entrez Gene ID: (Human) 7040
Molecular Function: growth factor