Recombinant Human CNTF Protein


Recombinant Human CNTF (Catalog #257‑NT) stimulates cell proliferation of the TF-1 human erythroleukemic cell line. The ED50 for this effect is 0.03-0.18 μg/mL.
1 μg/lane of Recombinant Human CNTF was resolved with SDS-PAGE under reducing (R) conditions and visualized by silver staining, showing a band at 26 kDa.

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Reactivity HuSpecies Glossary
Applications Bioactivity

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Recombinant Human CNTF Protein Summary

Details of Functionality
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 0.03-0.18 μg/mL.
The proliferative effect can be enhanced up to 100-fold by the addition of Recombinant Human CNTF R alpha (Catalog # 303-CR) .
E. coli-derived human CNTF protein
Accession #
N-terminal Sequence
Structure / Form

This recombinant protein is prone to proteolytic degradation at the C-terminus, resulting in proteins with molecular masses of 22.2-22.8 kDa.

Protein/Peptide Type
Recombinant Proteins
>97%, by SDS-PAGE visualized with Silver Staining and quantitative densitometry by Coomassie® Blue Staining.
Endotoxin Note
<0.10 EU per 1 μg of the protein by the LAL method.


  • Bioactivity
Theoretical MW
22.8 kDa.
Disclaimer note: The observed molecular weight of the protein may vary from the listed predicted molecular weight due to post translational modifications, post translation cleavages, relative charges, and other experimental factors.
23-26 kDa, reducing conditions
Read Publications using
257-NT in the following applications:

Packaging, Storage & Formulations

Use a manual defrost freezer and avoid repeated freeze-thaw cycles.
  • 12 months from date of receipt, -20 to -70 °C as supplied.
  • 3 months, 2 to 8 °C under sterile conditions after reconstitution.
Lyophilized from a 0.2 μm filtered solution in Tris, NaCl, TCEP, EDTA, CHAPS and Trehalose with BSA as a carrier protein.
>97%, by SDS-PAGE visualized with Silver Staining and quantitative densitometry by Coomassie® Blue Staining.
Reconstitution Instructions
Reconstitute at 100 μg/mL in sterile PBS containing at least 0.1% human or bovine serum albumin.


This product is produced by and ships from R&D Systems, Inc., a Bio-Techne brand.

Alternate Names for Recombinant Human CNTF Protein

  • ciliary neurotrophic factor
  • CNTF


Ciliary neurotrophic factor (CNTF) is a polypeptide initially purified from chick embryo ocular tissue and identified as a trophic factor for embryonic chick ciliary parasympathetic neurons in culture. Subsequent studies have demonstrated that CNTF is a survival factor for additional neuronal cell types including: dorsal root ganglion sensory neurons, sympathetic ganglion neurons, embryonic motor neurons, major pelvic ganglion neurons and hippocampal neurons. CNTF has also been shown to prevent the degeneration of motor axons after axotomy.

The gene for human CNTF has been localized to the proximal region of the long arm of chromosome 11. The cDNA for human CNTF encodes a 200 amino acid residue polypeptide that lacks a signal sequence. CNTF is highly conserved across species and exhibits cross-species activities. Human and rat CNTF share approximately 83% homology in their protein sequence. CNTF is structurally related to IL-6, IL-11, LIF and OSM. All of these four helix bundle cytokines share gp130 as a signal-transducing subunit in their receptor complexes.

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Publications for CNTF (257-NT)(53)

We have publications tested in 4 confirmed species: Human, Mouse, Canine, Chicken.

We have publications tested in 5 applications: Binding Assay, Bioassay, Cell Culture, ELISA (Capture), In Vivo.

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Showing Publications 1 - 10 of 53. Show All 53 Publications.
Publications using 257-NT Applications Species
Jovanovic, VM;Weber, C;Slamecka, J;Ryu, S;Chu, PH;Sen, C;Inman, J;De Sousa, JF;Barnaeva, E;Hirst, M;Galbraith, D;Ormanoglu, P;Jethmalani, Y;Mercado, JC;Michael, S;Ward, ME;Simeonov, A;Voss, TC;Tristan, CA;Singeç, I; A defined roadmap of radial glia and astrocyte differentiation from human pluripotent stem cells Stem cell reports 2023-07-04 [PMID: 37451260] (Bioassay, Human) Bioassay Human
MH Berryer, G Rizki, A Nathanson, JA Klein, D Trendafilo, SG Susco, D Lam, A Messana, KM Holton, KW Karhohs, BA Cimini, K Pfaff, AE Carpenter, LL Rubin, LE Barrett High-content synaptic phenotyping in human cellular models reveals a role for BET proteins in synapse assembly Elife, 2023-04-21;12(0):. 2023-04-21 [PMID: 37083703] (Bioassay, Human) Bioassay Human
SD Sharma, BK Reddy, R Pal, TE Ritakari, JD Cooper, BT Selvaraj, PC Kind, S Chandran, DJA Wyllie, S Chattarji Astrocytes mediate cell non-autonomous correction of aberrant firing in human FXS neurons Cell Reports, 2023-04-04;42(4):112344. 2023-04-04 [PMID: 37018073] (Bioassay, Human) Bioassay Human
HW Ong, Y Liang, W Richardson, ER Lowry, CI Wells, X Chen, M Silvestre, K Dempster, JA Silvaroli, JL Smith, H Wichterle, NS Pabla, SK Ultanir, AN Bullock, DH Drewry, AD Axtman A Potent and Selective CDKL5/GSK3 Chemical Probe is Neuroprotective bioRxiv : the preprint server for biology, 2023-02-10;0(0):. 2023-02-10 [PMID: 36798313] (Bioassay, Human) Bioassay Human
GR Linares, Y Li, WH Chang, J Rubin-Sigl, S Mendonca, S Hong, Y Eoh, W Guo, YH Huang, J Chang, S Tu, N Dorjsuren, M Santana, ST Hung, J Yu, J Perez, M Chickering, TY Cheng, CC Huang, SJ Lee, HJ Deng, KT Bach, K Gray, V Subramanya, J Rosenfeld, SV Alworth, H Goodarzi, JK Ichida SYF2 suppression mitigates neurodegeneration in models of diverse forms of ALS Cell Stem Cell, 2023-02-02;30(2):171-187.e14. 2023-02-02 [PMID: 36736291] (Bioassay, Human) Bioassay Human
O Pietiläine, A Trehan, D Meyer, J Mitchell, M Tegtmeyer, V Valakh, H Gebre, T Chen, E Vartiainen, SL Farhi, K Eggan, SA McCarroll, R Nehme Astrocytic cell adhesion genes linked to schizophrenia correlate with synaptic programs in neurons Cell Reports, 2023-01-12;42(1):111988. 2023-01-12 [PMID: 36640364] (Bioassay, Human) Bioassay Human
Z Álvarez, JA Ortega, K Sato, IR Sasselli, AN Kolberg-Ed, R Qiu, KA Marshall, TP Nguyen, CS Smith, KA Quinlan, V Papakis, Z Syrgiannis, NA Sather, C Musumeci, E Engel, SI Stupp, E Kiskinis Artificial extracellular matrix scaffolds of mobile molecules enhance maturation of human stem cell-derived neurons Cell Stem Cell, 2023-01-12;0(0):. 2023-01-12 [PMID: 36638801] (Bioassay, Human) Bioassay Human
K Leng, IVL Rose, H Kim, W Xia, W Romero-Fer, B Rooney, M Koontz, E Li, Y Ao, S Wang, M Krawczyk, J Tcw, A Goate, Y Zhang, EM Ullian, MV Sofroniew, SPJ Fancy, MS Schrag, ES Lippmann, M Kampmann CRISPRi screens in human iPSC-derived astrocytes elucidate regulators of distinct inflammatory reactive states Nature Neuroscience, 2022-10-27;25(11):1528-1542. 2022-10-27 [PMID: 36303069] (Bioassay, Human) Bioassay Human
H Ozaki, H Suga, M Sakakibara, M Soen, N Miyake, T Miwata, S Taga, T Nagai, M Kano, K Mitsumoto, T Miyata, T Kobayashi, M Sugiyama, T Onoue, H Takagi, D Hagiwara, S Iwama, R Banno, G Iguchi, Y Takahashi, K Muguruma, H Inoue, H Arima Differentiation of human induced pluripotent stem cells into hypothalamic vasopressin neurons with minimal exogenous signals and partial conversion to the naive state Scientific Reports, 2022-10-17;12(1):17381. 2022-10-17 [PMID: 36253431] (Cell Culture, Human) Cell Culture Human
T Patel, J Hammelman, S Aziz, S Jang, M Closser, TL Michaels, JA Blum, DK Gifford, H Wichterle Transcriptional dynamics of murine motor neuron maturation in vivo and in vitro Nature Communications, 2022-09-15;13(1):5427. 2022-09-15 [PMID: 36109497] (Cell Culture, Mouse) Cell Culture Mouse
Show All 53 Publications.

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Gene Symbol CNTF