Recombinant Human IGF-I/IGF-1 Protein, CF


Recombinant Human IGF-I/IGF-1 (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.
1 μg/lane of Recombinant Human IGF-I/IGF-1 was resolved with SDS-PAGE under reducing (R) conditions and visualized by silver staining, showing a single band at 7 kDa.
MALDI-TOF analysis of Recombinant Human IGF-I/IGF-1.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.

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Applications Bioactivity

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Recombinant Human IGF-I/IGF-1 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.
E. coli-derived human IGF-I/IGF-1 protein
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.


  • Bioactivity
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/IGF-1 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 (IGF-I or IGF-1), also known as somatomedin C, is the dominant effector of growth hormone and is structurally homologous to proinsulin. Human IGF-1 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-1 protein is identical between isoforms and is generated by proteolytic removal of the N- and C‑terminal regions. Mature human IGF-1 shares 94% and 96% aa sequence identity with mouse and rat IGF-1, respectively (2), and exhibits cross-species activity. It shares 64% aa sequence identity with mature human IGF-II/IGF-2. 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/IGF-1 binds IGF-I R, IGF-II R, and the insulin receptor, although its effects are mediated primarily by IGF-I R (9). The IGF-I protein associates with IGF binding proteins thereby increasing its plasma half‑life and modulating its interactions with receptors (10).

  1. Philippou, A. et al. (2007) In Vivo 21:45.
  2. Sandberg-Nordqvist, A.C. et al. (1992) Brain Res. Mol. Brain Res. 12:275.
  3. Guvakova, M.A. (2007) Int. J. Biochem. Cell Biol. 39:890.
  4. Clemmons, D.R. (2006) Curr. Opin. Pharmacol. 6:620.
  5. Bluher, S. et al. (2005) Best Pract. Res. Clin. Endocrinol. Metab. 19:577.
  6. Garcia-Segura, L.M. et al. (2006) Neuroendocrinology 84:275.
  7. Malemud, C.J. (2007) Clin. Chim. Acta 375:10.
  8. Samani, A.A. et al. (2007) Endocrine Rev. 28:20.
  9. LeRoith, D. and S. Yakar (2007) Nat. Clin. Pract. Endocrinol. Metab. 3:302.
  10. Denley, A. et al. (2005) Cytokine Growth Factor Rev. 16:421.

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Publications for IGF-I/IGF-1 (291-G1)(209)

We have publications tested in 16 confirmed species: Human, Mouse, Rat, Bovine, Canine, Chicken, Eastern Bluebirds, Feline, Hamster, Insect, L. braziliensis, N/A, Porcine, Primate - Macaca fascicularis (Crab-eating Monkey or Cynomolgus Macaque), Primate - Macaca nemestrina (Southern Pig-tailed Macaque), Rabbit.

We have publications tested in 8 applications: Bioassay, Cell Culture, Differentiation, ELISA (Standard), In Vivo, Neutralization, Surface Plasmon Resonance, Western Blot.

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ELISA (Standard)
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Eastern Bluebirds
L. braziliensis
Primate - Macaca fascicularis (Crab-eating Monkey or Cynomolgus Macaque)
Primate - Macaca nemestrina (Southern Pig-tailed Macaque)
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Showing Publications 1 - 10 of 209. Show All 209 Publications.
Publications using 291-G1 Applications Species
Maylem, ERS;Spicer, LJ;Batalha, IM;Sch�tz, LF; Developmental and hormonal regulation of FBN1 and OR4M1 mRNA in bovine granulosa cells Domestic animal endocrinology 2023-04-25 [PMID: 37167929] (Bioassay, Bovine) Bioassay Bovine
CA Hayes, NI Morgan, KC Thomas, MJ Pushie, A Vijayasank, BG Ashmore, K Wontor, MA De Leon, NM Ashpole Neuronal and Astrocyte Insulin-like Growth Factor-1 Signaling Differentially Modulates Ischemic Stroke Damage bioRxiv : the preprint server for biology, 2023-04-02;0(0):. 2023-04-02 [PMID: 37034764] (Bioassay, Mouse) Bioassay Mouse
AA Almad, L Garcia, A Takanohash, A Gagne, W Yang, J Ann McGuir, D French, A Vanderver Generation of three induced Pluripotent Stem Cell lines from individuals with Hypomyelination with Atrophy of Basal Ganglia and Cerebellum caused by a c.745G&gt;A (p.D249N) autosomal dominant mutation in TUBB4A Stem Cell Research, 2023-03-26;69(0):103083. 2023-03-26 [PMID: 37003180] (Bioassay, Human) Bioassay Human
NB Campbell, Y Patel, TL Moore, M Medalla, E Zeldich Extracellular Vesicle Treatment Alleviates Neurodevelopmental and Neurodegenerative Pathology in Cortical Spheroid Model of Down Syndrome International Journal of Molecular Sciences, 2023-02-09;24(4):. 2023-02-09 [PMID: 36834891] (Bioassay, Human) Bioassay Human
EF Cohn, BLL Clayton, M Madhavan, S Yacoub, Y Federov, K Paul-Fried, TJ Shafer, PJ Tesar Pervasive environmental chemicals impair oligodendrocyte development bioRxiv : the preprint server for biology, 2023-02-12;0(0):. 2023-02-12 [PMID: 36798415] (Bioassay, Human, Mouse) Bioassay Human, Mouse
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
PY Su, W Lee, J Zernant, SH Tsang, T Nagasaki, B Corneo, R Allikmets Establishment of the iPSC line CUIMCi005-A from a patient with Stargardt disease for retinal organoid culture Oncogene, 2022-11-14;65(0):102973. 2022-11-14 [PMID: 36455383] (Bioassay, Human) Bioassay Human
C Bueno, M Blanquer, D García-Ber, S Martínez, JM Moraleda Binucleated human bone marrow-derived mesenchymal cells can be formed during neural-like differentiation with independence of any cell fusion events Scientific Reports, 2022-11-30;12(1):20615. 2022-11-30 [PMID: 36450873] (Bioassay, Human) Bioassay Human
ESY Ng, N Kady, J Hu, A Dave, Z Jiang, J Pei, MB Gorin, A Matynia, RA Radu Membrane Attack Complex Mediates Retinal Pigment Epithelium Cell Death in Stargardt Macular Degeneration Cells, 2022-11-02;11(21):. 2022-11-02 [PMID: 36359858] (Bioassay, Human) Bioassay Human
M Ridenour, LJ Spicer, JL Grindstaff Insulin-like growth factor 1 and the hormonal mediation of sibling rivalry General and comparative endocrinology, 2022-11-07;330(0):114163. 2022-11-07 [PMID: 36356644] (Bioassay, Eastern Bluebirds) Bioassay Eastern Bluebirds
Show All 209 Publications.

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Gene Symbol IGF1