Human β-Nerve Growth Factor (hβ-NGF) #5221
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Product Information
Formulation
With carrier: Lyophilized from a 0.22 μm filtered solution of PBS, pH 7.2 containing 20 μg BSA per 1 μg hβ-NGF. Carrier free: Lyophilized from a 0.22 μm filtered solution of PBS, pH 7.2.
Storage
Stable in lyophilized state at -20°C for 1 year after receipt. Sterile stock solutions reconstituted with carrier protein are stable at 4°C for 2 months and at -20°C for 6 months. Avoid repeated freeze-thaw cycles.
Maintain sterility. Storage at -20°C should be in a manual defrost freezer.
Maintain sterility. Storage at -20°C should be in a manual defrost freezer.
Product Description
| MW (kDa) | 13 |
| Purity | >98% as determined by SDS-PAGE of 6 μg reduced (+) and non-reduced (-) recombinant hβ-NGF. All lots are greater than 98% pure. |
| Endotoxin | Less than 0.01 ng endotoxin/1 μg hβ-NGF. |
| Activity | The bioactivity of recombinant hβ-NGF was determined in a TF-1 cell proliferation assay. The ED50 of each lot is between 0.5-1.5 ng/ml. |
| Molecular Formula | Based on amino acid sequencing, greater than 85% of recombinant hβ-NGF starts at Ser122 (SSSHP) and has a calculated MW of 13,494. The remainder starts at Ser124 (SHPIF). DTT-reduced and non-reduced protein migrate as 13 kDa non-disulfide linked homodimers. |
Source / Purification
Recombinant human β-NGF (hβ-NGF) Ser122-Ala241 (Accession #NP_002497) was expressed in human 293 cells at Cell Signaling Technology.
Background
β-NGF is the prototypical member of the neurotrophin family of growth factors (1). β-NGF is involved in neuronal survival, differentiation and growth (1,2). Outside of the nervous system, NGF is produced by a variety of immune cells, including B cells, T cells, monocytes and mast cells (3,4). β-NGF binds to and signals through two distinct receptors, TrkA and p75NTR (1,2). Cellular responses induced by NGF are modulated by receptor expression. For example, TrKA leads to the inhibition of apoptosis and neuronal differentiation. In contrast, signaling through p75NTR in the absence of TrkA induces cell death. (1,2). NGF signaling via TrkA is characterized by activation of the PI3K/AKT and PLCγ pathways (1,2). NGF signaling via p75NTR induces JNK and NFκB activation (1,2). Aberrant NGF signaling may be linked to the onset of Alzheimer’s disease (5,6).
- Bibel, M. and Barde, Y.A. (2000) Genes Dev 14, 2919-37.
- Huang, E.J. and Reichardt, L.F. (2003) Annu Rev Biochem 72, 609-42.
- Frossard, N. et al. (2004) Eur J Pharmacol 500, 453-65.
- Jiang, Y. et al. (2007) J Immunol 179, 6297-304.
- Matrone, C. et al. (2009) Proc Natl Acad Sci USA 106, 11358-63.
- Matrone, C. et al. (2008) Proc Natl Acad Sci USA 105, 13139-44.
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For Research Use Only. Not For Use In Diagnostic Procedures.
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