CNTF Protein, Human

CNTF is a pluripotent neurotrophic factor, belonging to the IL-6 cytokine family^[1]. CNTF could protect retinal cone and rod photoreceptors^[2]. CNTF has neuroprotective effects on a variety of central and also peripheral nervous system neurons^[3]. CNTF Protein, Human is produced by E. coli (A2-M200) with tag free.

Ciliary Neurotrophic Factor (CNTF) belongs to the IL-6 cytokine family. IL-6, IL-11 and CNTF are associated with cytokine trans signaling. CNTF shows a low affinity interaction with IL-6 receptor subunit alpha (IL-6Rα), leading to the formation and activation of the IL-6Rβ/gp130/LIFR signaling receptor complex^[1]. CNTF is also an extracellular signaling protein in the neuroretinal and the interphotoreceptor matrix, which is associated with the membranes of the RPE, Muller and photoreceptor cells^[2]. CNTF has neuroprotective effects on a variety of central and also peripheral nervous system neurons. Because it promotes differentiation and maturation of oligodendrocyte precursor cells to oligodendrocytes under in vitro conditions and thus improves remyelination. Importantly, it also increases the survival of mature oligodendrocytes^[3]. The similarity of human CNTF protein sequences to mice and rats was 81.82% and 84.0%, respectively.

CNTF (human; 20 ng/mL; 3 d) significantly inhibits the activity of choline acetyltransferase (ChAT) in mesencephalic cultures^[4].

The ED₅₀ is <200 ng/mL as measured by TF-1 cells, corresponding to a specific activity of >5 × 10³ units/mg.

• 
  Measured in a cell proliferation assay using TF-1 human erythroleukemic cells. The ED₅₀ for this effect is 0.1749 μg/mL, corresponding to a specific activity is 5.717×10³ units/mg.

Human

E. coli

Tag Free

P26441 (A2-M200)

1270  [NCBI]

AFTEHSPLTPHRRDLCSRSIWLARKIRSDLTALTESYVKHQGLNKNINLDSADGMPVASTDQWSELTEAERLQENLQAYRTFHVLLARLLEDQQVHFTPTEGDFHQAIHTLLLQVAAFAYQIEELMILLEYKIPRNEADGMPINVGDGGLFEKKLWGLKVLQELSQWTVRSIHDLRFISSHQTGIPARGSHYIANNKKM

Approximately 22-25 kDa

• 
  Greater than 95% as determined by reducing SDS-PAGE.

Lyophilized powder

Lyophilized after extensive dialysis against PBS or 20 mM Tris-HCl, 100 mM NaCl, pH 8.0 or 50 mM Tris-HCL, 300 mM NaCl, pH 8.0 or PBS, pH 7.4, 8% trehalose.

<0.2 EU/μg, determined by LAL method.

It is not recommended to reconstitute to a concentration less than 100 μg/mL in ddH₂O. For long term storage it is recommended to add a carrier protein (0.1% BSA, 5% HSA, 10% FBS or 5% Trehalose).

Stored at -20°C for 2 years. After reconstitution, it is stable at 4°C for 1 week or -20°C for longer (with carrier protein). It is recommended to freeze aliquots at -20°C or -80°C for extended storage.

Room temperature in continental US; may vary elsewhere.

• [1]. Jones SA, et al. Recent insights into targeting the IL-6 cytokine family in inflammatory diseases and cancer. Nat Rev Immunol. 2018 Dec;18(12):773-789.  [Content Brief]

  [2]. Abbaszadeh HA, et al. Human ciliary neurotrophic factor-overexpressing stable bone marrow stromal cells in the treatment of a rat model of traumatic spinal cord injury. Cytotherapy. 2015 Jul;17(7):912-21.  [Content Brief]

  [3]. Li S, et al. Ciliary neurotrophic factor (CNTF) protects retinal cone and rod photoreceptors by suppressing excessive formation of the visual pigments. J Biol Chem. 2018 Sep 28;293(39):15256-15268.  [Content Brief]

  [4]. Pasquin S, et al. Ciliary neurotrophic factor (CNTF): New facets of an old molecule for treating neurodegenerative and metabolic syndrome pathologies. Cytokine Growth Factor Rev. 2015 Oct;26(5):507-15.  [Content Brief]

  [5]. Zurn A D, et al. Combined effects of GDNF, BDNF, and CNTF on motoneuron differentiation in vitro[J]. Journal of neuroscience research, 1996, 44(2): 133-141.