Human CNTF Quantikine ELISA Kit

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Control Products Available
Human CNTF ELISA Cell Culture Supernate Standard Curve
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Product Details
Citations (11)
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Human CNTF Quantikine ELISA Kit Summary

Assay Type
Solid Phase Sandwich ELISA
96-well strip plate
Assay Length
3.5 hours or 4.5 hours
Sample Type & Volume Required Per Well
Cell Culture Supernates (200 uL), Serum (200 uL), EDTA Plasma (200 uL), Heparin Plasma (200 uL), Citrate Plasma (200 uL)
8 pg/mL
Assay Range
31.2 - 2,000 pg/mL (Cell Culture Supernates, Serum, EDTA Plasma, Heparin Plasma, Citrate Plasma)
Recombinant human CNTF
< 0.5% cross-reactivity observed with available related molecules.< 50% cross-species reactivity observed with species tested.
No significant interference observed with available related molecules.

Product Summary

The Quantikine Human CNTF Immunoassay is a 3.5 or 4.5 hour solid phase ELISA designed to measure recombinant human CNTF in cell culture supernates, serum, and plasma. It contains recombinant human CNTF and has been shown to accurately quantitate the recombinant factor.


Intra-Assay Precision (Precision within an assay) Three samples of known concentration were tested on one plate to assess intra-assay precision
Inter-Assay Precision (Precision between assays) Three samples of known concentration were tested in separate assays to assess inter-assay precision

Cell Culture Supernates

Intra-Assay Precision Inter-Assay Precision
Sample 1 2 3 1 2 3
n 20 20 20 40 40 40
Mean (pg/mL) 110 461 1295 128 399 821
Standard Deviation 5 10.2 31.4 10.1 26.8 52.6
CV% 4.5 2.2 2.4 7.9 6.7 6.4

Serum, EDTA Plasma, Heparin Plasma, Citrate Plasma

Intra-Assay Precision Inter-Assay Precision
Sample 1 2 3 1 2 3
n 20 20 20 40 40 40
Mean (pg/mL) 103 406 1201 206 671 1388
Standard Deviation 4.4 12 28.2 19.6 47.8 93.9
CV% 4.3 3 2.3 9.5 7.1 6.8


The recovery of CNTF spiked to three different levels throughout the range of the assay in various matrices was evaluated.

Sample Type Average % Recovery Range %
Cell Culture Media (n=5) 99 92-115
Citrate Plasma (n=5) 87 71-125
EDTA Plasma (n=5) 90 78-97
Heparin Plasma (n=5) 92 82-98
Serum (n=5) 95 85-101


To assess the linearity of the assay, samples were spiked with high concentrations of CNTF in various matrices and diluted with the appropriate Calibrator Diluent to produce samples with values within the dynamic range of the assay.
Human CNTF ELISA Linearity

Data Examples

Human CNTF ELISA Cell Culture Supernate Standard Curve

Human CNTF ELISA Serum/Plasma Standard Curve

Product Datasheets

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Preparation and Storage

The product is shipped at ambient temperature. Upon receipt, store it immediately at the temperature recommended below.
Store the unopened product at 2 - 8 °C. Do not use past expiration date.

Background: CNTF

Ciliary neurotrophic factor (CNTF) is structurally related to IL-6, IL-11, LIF, CLC, and OSM. CNTF was initially 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.

Long Name:
Ciliary Neurotrophic Factor
Entrez Gene IDs:
1270 (Human); 12803 (Mouse); 25707 (Rat)
Alternate Names:
ciliary neurotrophic factor; CNTF; HCNTF
⚠ WARNING: This product can expose you to chemicals including N,N-Dimethylforamide, which is known to the State of California to cause cancer. For more information, go to

Assay Procedure

Refer to the product for complete assay procedure.

Bring all reagents and samples to room temperature before use. It is recommended that all samples, standards, and controls be assayed in duplicate.
  1.   Prepare all reagents, standard dilutions, and samples as directed in the product insert.
  2.   Remove excess microplate strips from the plate frame, return them to the foil pouch containing the desiccant pack, and reseal.

  3. 50 µL Assay Diluent
  4.   Add 50 µL of Assay Diluent to each well.

  5. 200 µL Standard, Control, or Sample
  6.   Add 200 µL of Standard, control, or sample to each well. Cover with a plate sealer, and incubate at room temperature for 2 hours.
  7.   Aspirate each well and wash, repeating the process twice for a total of 3 washes.

  8. 200 µL Conjugate
  9.   Add 200 µL of Conjugate to each well.
  10.   For Serum & Plasma Samples: Cover with a new plate sealer, and incubate at room temperature for 2 hours.
    For Cell Culture Supernate Samples: Cover with a new plate sealer, and incubate at room temperature for 1 hour.
  11.   Aspirate and wash 3 times.

  12. 200 µL Substrate Solution
  13.   Add 200 µL Substrate Solution to each well. Incubate at room temperature for 20 minutes. PROTECT FROM LIGHT.

  14. 50 µL Stop Solution
  15. Add 50 µL of Stop Solution to each well. Read at 450 nm within 30 minutes. Set wavelength correction to 540 nm or 570 nm.

Citations for Human CNTF Quantikine ELISA Kit

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.

11 Citations: Showing 1 - 10
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  1. Elevated Serum Cortisol Levels in Patients with Focal Epilepsy, Depression, and Comorbid Epilepsy and Depression
    Authors: TA Druzhkova, AA Yakovlev, FK Rider, MS Zinchuk, AB Guekht, NV Gulyaeva
    International Journal of Molecular Sciences, 2022;23(18):.
    Species: Human
    Sample Types: Serum
  2. Leukemia inhibitory factor via the Toll-like receptor 5 signaling pathway involves aggravation of cachexia induced by human gastric cancer-derived 85As2 cells in rats
    Authors: K Terawaki, Y Kashiwase, M Uzu, M Nonaka, Y Sawada, K Miyano, Y Higami, K Yanagihara, M Yamamoto, Y Uezono
    Oncotarget, 2018;9(78):34748-34764.
    Species: Human
    Sample Types: Cell Culture Supernates
  3. Purification and characterization of a long-acting ciliary neurotrophic factor via genetically fused with an albumin-binding domain
    Authors: L Xu, C Zhang, L Liu, Y Zhang, Q Wang, J Wang, Y Liu, Z Su
    Protein Expr. Purif., 2017;0(0):.
    Species: Rat
    Sample Types: Serum
  4. Development of long-acting ciliary neurotrophic factor by site-specific conjugation with different-sized polyethylene glycols and transferrin
    Authors: C Zhang, R Yu, Z Li, C Feng, Q Wang, Y Liu, Z Su
    Int J Pharm, 2017;0(0):.
    Species: Human
    Sample Types: Recombinant Protein
  5. Ciliary neurotrophic factor in patients with primary open-angle glaucoma and age-related cataract
    Authors: AA Shpak, AB Guekht, TA Druzhkova, KI Kozlova, NV Gulyaeva
    Mol. Vis., 2017;23(0):799-809.
    Species: Human
    Sample Types: Serum
  6. Ciliary neurotrophic factor (CNTF) for human retinal degeneration: phase I trial of CNTF delivered by encapsulated cell intraocular implants.
    Authors: Sieving PA, Caruso RC, Tao W, Coleman HR, Thompson DJ, Fullmer KR, Bush RA
    Proc. Natl. Acad. Sci. U.S.A., 2006;103(10):3896-901.
    Species: Human
    Sample Types: Cell Culture Supernates
  7. Transplantation of transduced retinal pigment epithelium in rats.
    Authors: Saigo Y, Abe T, Hojo M, Tomita H, Sugano E, Tamai M
    Invest. Ophthalmol. Vis. Sci., 2004;45(6):1996-2004.
    Species: Rat
    Sample Types: Cell Culture Supernates
  8. AF5, a CNS cell line immortalized with an N-terminal fragment of SV40 large T: growth, differentiation, genetic stability, and gene expression.
    Authors: Truckenmiller ME, Vawter MP, Zhang P, Conejero-Goldberg C, Dillon-Carter O, Morales N, Cheadle C, Becker KG, Freed WJ
    Exp. Neurol., 2002;175(0):318.
    Species: Rat
    Sample Types: Cell Culture Supernates
  9. Restoration of cognitive and motor functions by ciliary neurotrophic factor in a primate model of Huntington's disease.
    Authors: Mittoux V, Joseph JM, Conde F, Palfi S, Dautry C, Poyot T, Bloch J, Deglon N, Ouary S, Nimchinsky EA, Brouillet E, Hof PR, Peschanski M, Aebischer P, Hantraye P
    Hum. Gene Ther., 2000;11(8):1177-87.
    Species: Human
    Sample Types: Cell Culture Supernates
  10. Cytokine production in rhesus monkeys infected with Plasmodium coatneyi.
    Authors: Yang C, Xiao L, Tongren JE, Sullivan J, Lal AA, Collins WE
    Am. J. Trop. Med. Hyg., 1999;61(2):226-9.
    Species: Primate
    Sample Types: Serum
  11. Regional changes of ciliary neurotrophic factor and nerve growth factor levels in post mortem spinal cord and cerebral cortex from patients with motor disease.
    Authors: Anand P, Parrett A, Martin J, Zeman S, Foley P, Swash M, Leigh PN, Cedarbaum JM, Lindsay RM, Williams-Chestnut RE
    Nat. Med., 1995;1(2):168-72.
    Species: Human
    Sample Types: Tissue Homogenates


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Human CNTF Quantikine ELISA Kit
By Anonymous on 12/03/2018
Sample Tested: Human cell conditioned medium