Recombinant Human IGF-I Protein, CF


1 μg/lane of Recombinant Human IGF-I was resolved with SDS-PAGE under reducing (R) conditions and visualized by silver staining, showing a single band at 7 kDa.
Recombinant Human IGF-I (Catalog # 291-G1) stimulates proliferation in the MCF-7 human breast cancer cell line. The ED50 for this effect is 0.3‑1.5 ng/mL.
MALDI-TOF analysis of Recombinant Human IGF-I.The major peak corresponds to the calculated molecular mass, 7650 Da. The minor peak at 7873 is a matrix-associated artifact of the MALDI-TOF.

Product Details

Reactivity HuSpecies Glossary
Applications BA

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Recombinant Human IGF-I Protein, CF Summary

Details of Functionality
Measured in a serum-free cell proliferation assay using MCF‑7 human breast cancer cells. Karey, K.P. et al. (1988) Cancer Research 48:4083. The ED50 for this effect is 0.3-1.5 ng/mL.
The specific activity of recombinant human IGF-l is approximately 2.5 IU/μg, which is calibrated against recombinant human IGF-l WHO International Standard (NIBSC code: 91/554).
E. coli-derived
Accession #
N-terminal Sequence
Protein/Peptide Type
Recombinant Proteins
>97%, by SDS-PAGE under reducing conditions and visualized by silver stain.
Endotoxin Note
<0.10 EU per 1 μg of the protein by the LAL method.


Theoretical MW
7.6 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.
7 kDa, reducing conditions
Read Publications using
291-G1 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.
>97%, by SDS-PAGE under reducing conditions and visualized by silver stain.
Reconstitution Instructions
Reconstitute at 200 μg/mL in sterile PBS.


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

Alternate Names for Recombinant Human IGF-I Protein, CF

  • IBP1
  • IGF1
  • IGF-1
  • IGF1A
  • IGFI
  • IGF-I
  • IGF-IA
  • IGF-IB
  • insulin-like growth factor 1 (somatomedin C)
  • insulin-like growth factor 1
  • insulin-like growth factor I
  • insulin-like growth factor IA
  • insulin-like growth factor IB
  • Mechano growth factor
  • MGF
  • Somatomedin A
  • Somatomedin C
  • somatomedin-C


Insulin-like growth factor I, also known as somatomedin C, is the dominant effector of growth hormone and is structurally homologous to proinsulin. Human IGF-I is synthesized as two precursor isoforms with N- and alternate C‑terminal propeptides (1). These isoforms are differentially expressed by various tissues (1). The 7.6 kDa mature IGF‑I is identical between isoforms and is generated by proteolytic removal of the N- and C‑terminal regions. Mature human IGF-I shares 94% and 96% aa sequence identity with mouse and rat IGF-I, respectively (2), and exhibits cross-species activity. It shares 64% aa sequence identity with mature human IGF‑II. Circulating IGF-I is produced by hepatocytes, while local IGF-I is produced by many other tissues in which it has paracrine effects (1). IGF-I induces the proliferation, migration, and differentiation of a wide variety of cell types during development and postnatally (3). IGF-I regulates glucose and fatty acid metabolism, steroid hormone activity, and cartilage and bone metabolism (4‑7). It plays an important role in muscle regeneration and tumor progression (1, 8). IGF-I binds IGF-I R, IGF-II R, and the insulin receptor, although its effects are mediated primarily by IGF-I R (9). IGF-I association with IGF binding proteins increases its plasma half‑life and modulates its interactions with receptors (10).

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Publications for (87)

We have publications tested in 11 confirmed species: Human, Mouse, Rat, Bovine, Canine, Chicken, Insect, N/A, Primate - Macaca fascicularis (Crab-eating Monkey or Cynomolgus Macaque), Primate - Macaca nemestrina (Southern Pig-tailed Macaque), Rabbit.

We have publications tested in 7 applications: Bioassay, BioassayCell, ELISA Standard, In Vivo, Neut, WB Ctrl, cell culture.

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Primate - Macaca fascicularis (Crab-eating Monkey or Cynomolgus Macaque)
Primate - Macaca nemestrina (Southern Pig-tailed Macaque)
All Species
Showing Publications 1 - 10 of 87. Show All 87 Publications.
Publications using 291-G1 Applications Species
E Varga, C Nemes, I Bock, Z Táncos, S Berzsenyi, G Lévay, V Román, J Kobolák, A Dinnyés Establishment of an induced pluripotent stem cell (iPSC) line from a 9-year old male with autism spectrum disorder (ASD) Stem Cell Res, 2017;21(0):19-22. 2017 [PMID: 28677532] (Bioassay, Human) Bioassay Human
P Haynes, K Kernan, SL Zhou, DG Miller Expression patterns of FSHD-causing DUX4 and myogenic transcription factors PAX3 and PAX7 are spatially distinct in differentiating human stem cell cultures Skelet Muscle, 2017;7(1):13. 2017 [PMID: 28637492] (Bioassay, Human) Bioassay Human
DJ Tischfield, J Kim, SA Anderson Atypical PKC and Notch Inhibition Differentially Modulate Cortical Interneuron Subclass Fate from Embryonic Stem Cells Stem Cell Reports, 2017;0(0):. 2017 [PMID: 28416285] (Bioassay, Mouse) Bioassay Mouse
Nevin Z, Factor D, Karl R, Douvaras P, Laukka J, Windrem M, Goldman S, Fossati V, Hobson G, Tesar P Modeling the Mutational and Phenotypic Landscapes of Pelizaeus-Merzbacher Disease with Human iPSC-Derived Oligodendrocytes. Am J Hum Genet, 0;100(4):617-634. 0 [PMID: 28366443] (Bioassay, Human) Bioassay Human
J Mercado-Ma, JL Clark, AJ Piper, J Janusis, LM Shaw Differential involvement of the microtubule cytoskeleton in Insulin Receptor Substrate-1 (IRS-1) and IRS-2 signaling to AKT determines response to microtubule disruption in breast carcinoma cells J. Biol. Chem, 2017;0(0):. 2017 [PMID: 28320862] (Bioassay, Human) Bioassay Human
H He, AE Kuriyan, CW Su, M Mahabole, Y Zhang, YT Zhu, HW Flynn, JM Parel, SC Tseng Inhibition of Proliferation and Epithelial Mesenchymal Transition in Retinal Pigment Epithelial Cells by Heavy Chain-Hyaluronan/Pentraxin 3 Sci Rep, 2017;7(0):43736. 2017 [PMID: 28252047] (Bioassay, Human) Bioassay Human
J Shao, PY Zhou, GH Peng Experimental Study of the Biological Properties of Human Embryonic Stem Cell-Derived Retinal Progenitor Cells Sci Rep, 2017;7(0):42363. 2017 [PMID: 28205557] (Bioassay, Human) Bioassay Human
C Lorenz, P Lesimple, R Bukowiecki, A Zink, G Inak, B Mlody, M Singh, M Semtner, N Mah, K Aur‚, M Leong, O Zabiegalov, EM Lyras, V Pfiffer, B Fauler, J Eichhorst, B Wiesner, N Huebner, J Priller, T Mielke, D Meierhofer, Z Izsv k, JC Meier, F Bouillaud, J Adjaye, M Schuelke, EE Wanker, A LombŠs, A Prigione Human iPSC-Derived Neural Progenitors Are an Effective Drug Discovery Model for Neurological mtDNA Disorders Cell Stem Cell, 2017;0(0):. 2017 [PMID: 28132834] (Bioassay, Human) Bioassay Human
NA Afratis, P Bouris, SS Skandalis, HA Multhaupt, JR Couchman, AD Theocharis, NK Karamanos IGF-IR cooperates with ER? to inhibit breast cancer cell aggressiveness by regulating the expression and localisation of ECM molecules Sci Rep, 2017;7(0):40138. 2017 [PMID: 28079144] (Bioassay, Human) Bioassay Human
G Dalton, SW An, SI Al-Juboori, N Nischan, J Yoon, E Dobrinskik, DW Hilgemann, J Xie, K Luby-Phelp, JJ Kohler, L Birnbaumer, CL Huang Soluble klotho binds monosialoganglioside to regulate membrane microdomains and growth factor signaling Proc. Natl. Acad. Sci. U.S.A, 2017;114(4):752-757. 2017 [PMID: 28069944] (BioassayCell, Human) BioassayCell Human
Show All 87 Publications.

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Gene Symbol IGF1