Recombinant Human IL-6/IL-6R alpha Protein Chimera


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Recombinant Human IL-6/IL-6R alpha Protein Chimera Summary

Details of Functionality
Measured by its ability to inhibit M1 mouse myeloid leukemia cell proliferation. The ED50 for this effect is 2.5-12.5 ng/mL.
Human embryonic kidney cell, HEK293-derived human IL-6/IL-6R alpha Complex protein
Human IL-6R alpha
Accession # P08887
Accession # P05231
Accession #
N-terminal Sequence
Leu20 (Human IL-6R alpha)
Protein/Peptide Type
Recombinant Proteins
>90%, 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
59 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.
78-93 kDa, reducing conditions
Read Publications using
8954-SR 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.
  • 1 month, 2 to 8 °C under sterile conditions after reconstitution.
  • 3 months, -20 to -70 °C under sterile conditions after reconstitution.
Lyophilized from a 0.2 μm filtered solution in PBS with BSA as a carrier protein.
>90%, by SDS-PAGE visualized with Silver Staining and quantitative densitometry by Coomassie® Blue Staining.
Reconstitution Instructions
Reconstitute at 500 μg/mL in PBS.


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

Alternate Names for Recombinant Human IL-6/IL-6R alpha Protein Chimera

  • IL-6/IL-6R alpha Complex


Interleukin-6 (IL-6) is a pleiotropic, alpha -helical, 22-28 kDa phosphorylated and variably glycosylated cytokine that plays important roles in the acute phase reaction, inflammation, hematopoiesis, bone metabolism, and cancer progression (1-5). Mature human IL-6 is 183 amino acids (aa) in length and shares 39% aa sequence identity with mouse and rat IL-6 (6). Alternative splicing generates several isoforms with internal deletions, some of which exhibit antagonistic properties (7-10). IL-6 induces signaling through a cell surface heterodimeric receptor complex composed of a ligand binding subunit (IL-6 R alpha) and a signal transducing subunit (gp130). IL-6 binds to IL-6 R alpha , triggering IL-6 R alpha association with gp130 and gp130 dimerization (11). gp130 is also a component of the receptors for CLC, CNTF, CT-1, IL-11, IL-27, LIF, and OSM (12). Soluble forms of IL-6 R alpha are generated by both alternative splicing and proteolytic cleavage (5). In a mechanism known as trans-signaling, complexes of soluble IL-6 and IL-6 R alpha elicit responses from gp130-expressing cells that lack cell surface IL-6 R alpha (5). Trans-signaling enables a wider range of cell types to respond to IL-6, as the expression of gp130 is ubiquitous, while that of IL-6 R alpha is predominantly restricted to hepatocytes, monocytes, and resting lymphocytes (2, 5). Soluble splice forms of gp130 block trans-signaling from IL-6/IL-6 R alpha but not from other cytokines that use gp130 as a co-receptor (5, 13). IL-6, along with TNF-alpha and IL-1, drives the acute inflammatory response and the transition from acute inflammation to either acquired immunity or chronic inflammatory disease (1-5). When dysregulated, it contributes to chronic inflammation in obesity, insulin resistance, inflammatory bowel disease, arthritis, sepsis, and atherosclerosis (1, 2, 5). IL-6 can also function as an anti-inflammatory molecule, as in skeletal muscle where it is secreted in response to exercise (2). In addition, it enhances hematopoietic stem cell proliferation and the differentiation of Th17 cells, memory B cells, and plasma cells (1, 14).
  1. Mansell, A. and B.J. Jenkins (2013) Cytokine Growth Factor Rev. 24:249.
  2. Schuett, H. et al. (2009) Thromb. Haemost. 102:215.
  3. Erta, M. et al. (2012) Int. J. Biol. Sci. 8:1254.
  4. Garbers, C. et al. (2012) Cytokine Growth Factor Rev. 23:85.
  5. Mihara, M. et al. (2012) Clin. Sci. (Lond.) 122:143.
  6. Hirano, T. et al. (1986) Nature 324:73.
  7. Kestler, D.P. et al. (1995) Blood 86:4559.
  8. Kestler, D.P. et al. (1999) Am. J. Hematol. 61:169.
  9. Bihl, M.P. et al. (2002) Am. J. Respir. Cell Mol. Biol. 27:48.
  10. Alberti, L. et al. (2005) Cancer Res. 65:2.
  11. Murakami, M. et al. (1993) Science 260:1808.
  12. Muller-Newen, G. (2003) Sci. STKE 2003:PE40.
  13. Mitsuyama, K. et al. (2006) Clin. Exp. Immunol. 143:125.
  14. Cerutti, A. et al. (1998) J. Immunol. 160:2145.

Publications for IL-6/IL-6R alpha Complex (8954-SR)(6)

We have publications tested in 1 confirmed species: Human.

We have publications tested in 1 application: Bioassay.

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Showing Publications 1 - 6 of 6.
Publications using 8954-SR Applications Species
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
Z Cai, S Tian, T Klein, L Tu, LW Geenen, T Koudstaal, AE van den Bo, YB de Rijke, IKM Reiss, E Boersma, C van der Le, M Van Faasse, I Kema, DJ Duncker, KA Boomars, K Tran-Lundm, C Guignabert, D Merkus Kynurenine metabolites predict survival in pulmonary arterial hypertension: A role for IL-6/IL-6Ralpha Scientific Reports, 2022-07-19;12(1):12326. 2022-07-19 [PMID: 35853948] (Bioassay, Human) Bioassay Human
G Carbotti, B Dozin, S Martini, C Giordano, F Scordamagl, M Croce, G Filaci, S Ferrini, M Fabbi IL-27 Mediates PD-L1 Expression and Release by Human Mesothelioma Cells Cancers, 2021-08-09;13(16):. 2021-08-09 [PMID: 34439164] (Bioassay, Human) Bioassay Human
J Dong, S Viswanatha, E Adami, BK Singh, SP Chothani, B Ng, WW Lim, J Zhou, M Tripathi, NSJ Ko, SG Shekeran, J Tan, SY Lim, M Wang, PM Lio, PM Yen, S Schafer, SA Cook, AA Widjaja Hepatocyte-specific IL11 cis-signaling drives lipotoxicity and underlies the transition from NAFLD to NASH Nature Communications, 2021-01-04;12(1):66. 2021-01-04 [PMID: 33397952] (Bioassay, Human) Bioassay Human
T Kretschmer, M Schulze-Ed, EM Turnwald, R Janoschek, I Bae-Gartz, P Zentis, M Handwerk, M Wohlfarth, A Schauss, E Hucklenbru, J Dötsch, S Appel Effect of Maternal Obesity in Mice on IL-6 Levels and Placental Endothelial Cell Homeostasis Nutrients, 2020-01-22;12(2):. 2020-01-22 [PMID: 31979004] (Bioassay, Human) Bioassay Human
Ohta R, Sugimura R, Niwa A, Saito M Hemogenic Endothelium Differentiation from Human Pluripotent Stem Cells in A Feeder- and Xeno-free Defined Condition. J Vis Exp, 2019-06-16;0(148):. 2019-06-16 [PMID: 31259914] (Bioassay, Human) Bioassay Human

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