Recombinant Rat beta-NGF (CHO-expressed) Protein

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R&D Systems Recombinant Proteins and Enzymes
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Recombinant Rat beta-NGF (CHO-expressed) Protein Summary

Product Specifications

>95%, by SDS-PAGE under reducing conditions and visualized by silver stain.
Endotoxin Level
<0.10 EU per 1 μg of the protein by the LAL method.
Measured in a cell proliferation assay using TF‑1 human erythroleukemic cells. Kitamura, T. et al. (1989) J. Cell Physiol. 140:323. The ED50 for this effect is 0.3-1.8 ng/mL.
Chinese Hamster Ovary cell line, CHO-derived rat beta-NGF protein
Accession #
N-terminal Sequence
Predicted Molecular Mass
13.4 kDa
11-12 kDa, reducing conditions

Product Datasheets

7815-NG (with carrier)

7815-NG/CF (carrier free)

Carrier Free

What does CF mean?

CF stands for Carrier Free (CF). We typically add Bovine Serum Albumin (BSA) as a carrier protein to our recombinant proteins. Adding a carrier protein enhances protein stability, increases shelf-life, and allows the recombinant protein to be stored at a more dilute concentration. The carrier free version does not contain BSA.

What formulation is right for me?

In general, we advise purchasing the recombinant protein with BSA for use in cell or tissue culture, or as an ELISA standard. In contrast, the carrier free protein is recommended for applications, in which the presence of BSA could interfere.


Formulation Lyophilized from a 0.2 μm filtered solution in PBS with BSA as a carrier protein.
Reconstitution Reconstitute at 100 μg/mL in PBS containing at least 0.1% human or bovine serum albumin.
Shipping The product is shipped at ambient temperature. Upon receipt, store it immediately at the temperature recommended below.
Stability & Storage: Use a manual defrost freezer and avoid repeated freeze-thaw cycles.
  • 12 months from date of receipt, -20 to -70 °C as supplied.
  • 1 month, 2 to 8 °C under sterile conditions after reconstitution.
  • 3 months, -20 to -70 °C under sterile conditions after reconstitution.


Formulation Lyophilized from a 0.2 μm filtered solution in PBS.
Reconstitution Reconstitute at 100 μg/mL in PBS.
Shipping The product is shipped at ambient temperature. Upon receipt, store it immediately at the temperature recommended below.
Stability & Storage: Use a manual defrost freezer and avoid repeated freeze-thaw cycles.
  • 12 months from date of receipt, -20 to -70 °C as supplied.
  • 1 month, 2 to 8 °C under sterile conditions after reconstitution.
  • 3 months, -20 to -70 °C under sterile conditions after reconstitution.
Reconstitution Calculator

Reconstitution Calculator

The reconstitution calculator allows you to quickly calculate the volume of a reagent to reconstitute your vial. Simply enter the mass of reagent and the target concentration and the calculator will determine the rest.


Background: beta-NGF

NGF (Nerve growth factor; also known as beta ‑NGF and 2.5S NGF) is a 13‑14 kDa secreted member of the neurotrophin family, cysteine knot superfamily of molecules (1‑3). It is a noncovalent dimer expressed by a wide variety of cells including adipocytes (4), eosinophils (5), mast cells (DC) (6), neurons (7), CD4+ and CD8+ T cells (8), activated astrocytes (9), keratinocytes (10), rodent submandibular gland epithelium (11) and activated microglia plus Schwann cells (12). Rat beta ‑NGF is synthesized as a precursor that is 241 amino acids (aa) in length (13, 14). Based on mouse, it contains an 18 aa signal sequence, a 103 aa cleavable proregion, a 118 aa mature region (aa 122‑239) and a two aa C‑terminal propeptide (13‑16). Based on mouse, there is likely to be a 307 aa isoform that utilizes an upstream alternative start site (14, 16, 17).  Although proteolytic processing typically occurs intracellularly, proNGF is well recognized to be secreted, where it either undergoes extracellar proteolytic processing, or remains intact to act as a bioactive isoform of NGF (3, 7, 18, 19, 20). Mature rat NGF shares 92% and 96% aa sequence identity with human and mouse NGF, respectively. It should be noted that beta ‑NGF and NGF are synonymous. NGF was originally isolated from the mouse submaxillary/submandibular gland as part of a 7S/140 kDa complex that contained three subunits; an inactive kallikrein molecule ( alpha ‑subunit), a potentially active different kallikrein molecule ( gamma ‑subunit) and a beta ‑subunit (NGF). Other than in rodent, this complex does not exist, and the two kallikreins are not believed to contribute to NGF proteolytic processing. Their presence may simply reflect an incidental release of kallikrein molecules during NGF secretion (3, 20).

NGF has a number of functions, some of which seem at odds with each other. Although it has been reported to have direct neurotrophic activity in the CNS, this is likely due to the effects of proNGF rather than NGF (21). Outside the CNS and during development, NGF activity reportedly ensures that the proper number of heat‑sensitive C‑fibers form, and that they maintain their sensitivity to heat through TRPV1 expression (22). And in the immune system, NGF promotes mast cell survival at the expense of proliferation (23). During inflammation, NGF is also reportedly up‑regulated by Schwann cells. Here, it acts on local neurons, inducing neuronal TNF‑ alpha secretion, which feeds‑back on TNF type II receptors on neurons and promotes survival (12). By contrast, NGF action on select cell lines has been shown to induce apoptosis, and this has led to some confusion as to the mechanism of NGF action (24). To date, there are two receptors for NGF (at least three for proNGF) (2, 25‑27). They are p75NTR and TrkA. It would appear at this time that the p75:TrkA ratio drives the various outcomes associated with NGF exposure (21, 25).

  1. Skaper, S.D. (2012) Methods Mol. Biol. 846:1.
  2. Ichim G. et al. (2012) Exp. Cell Res. 318:1221.
  3. Shooter, E.M. (2001) Annu. Rev. Neurosci. 24:601.
  4. Wang, B. et al. (2005) Am. J. Physiol. Endocrinol. Metab. 288:E731.
  5. Kobayashi, H. et al. (2002) Blood 99:2214.
  6. Nilsson, G. et al. (1997) Eur. J. Immunol. 27:2295.
  7. Lim, K-C. et al. (2007) Biochem. Biophys. Res. Commun. 361:599.
  8. Santambrogio, L. et al. (1994) J. Immunol. 153:4488.
  9. Labie, C. et al. (1999) Br. J. Pharmacol. 127:139.
  10. Pincelli, C. et al. (1994) J. Invest. Dermatol. 103:13.
  11. Leick, M. et al. (2009) Immunology 129:536.
  12. Yoshimura, T. and J.J. Oppenheim (2011) Exp. Cell Res. 317:674.
  13. SwissProt Accession # P25427.
  14. Whittemore, S.R. et al. (1988) J. Neurosci. Res. 20:403
  15. Scott, J. et al. (1983) Nature 302:538.
  16. Ullrich, A. et al. (1983) Nature 303:821.
  17. Dicou, E. (1992) Mol. Brain Res. 14:136.
  18. Hempstead, B.L. (2009) Neurotox. Res. 16:225.
  19. Dicou, E. (2007) Arch. Physiol. Biochem. 113:228.
  20. Seidah, N.G. et al. (1996) Biochem J. 314:951.
  21. Masoudi, R. et al. (2009) J. Biol. Chem. 284:18424.
  22. Petruska, J.C. and L.M. Mendell (2004) Neurosci. Lett. 361:168.
  23. Horigome, K. et al. (1994) J. Biol. Chem. 269:2695.
  24. Bono, F. et al. (1999) FEBS Lett. 457:93.
  25. He, X-L. and K.C. Garcia (2004) Science 304:870.
  26. Clewes, O. et al. (2008) J. Neurochem. 107:1124.
  27. Boutilier, J. et al. (2008) J. Biol. Chem. 283:12709.
Long Name
beta Nerve Growth Factor
Entrez Gene IDs
4803 (Human); 18049 (Mouse); 310738 (Rat); 403402 (Canine); 103350089 (Rabbit)
Alternate Names
Beta nerve growth factor precursor; beta-nerve growth factor; betaNGF; beta-NGF; HSAN5; MGC161426; nerve growth factor (beta polypeptide); nerve growth factor, beta subunit; NGFB; NGFBMGC161428

Citation for Recombinant Rat beta-NGF (CHO-expressed) Protein

R&D Systems personnel manually curate a database that contains references using R&D Systems products. The data collected includes not only links to publications in PubMed, but also provides information about sample types, species, and experimental conditions.

1 Citation: Showing 1 - 1

  1. Di-Huang-Yi-Zhi herbal formula attenuates amyloid-?-induced neurotoxicity in PC12 cells
    Authors: HM An, C Lin, C Gu, JJ Chen, WX Sun, M Jin, TL Zhang, MF Qiu, B Hu
    Exp Ther Med, 2017;13(6):3003-3008.
    Species: Rat
    Sample Types: Whole Cells
    Applications: Bioassay


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