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Source / Purification

Recombinant human IGF-II (hIGF-II) Ala25-Glu94 (Accession # P01344-2) was produced in E. coli at Cell Signaling Technology.

Product Description


>98% as determined by SDS-PAGE of 6 μg reduced (+) and non-reduced (-) recombinant hIGF-II. All lots are greater than 98% pure.

Molecular Formula:

Recombinant hIGF-II does not have a Met on the amino terminus and has a calculated MW of 7,606. DTT-reduced and non-reduced protein migrate as 6 kDa polypeptides. The expected amino-terminal AYRPS of recombinant hIGF-II was verified by amino acid sequencing.


The bioactivity of recombinant hIGF-II was determined in a cell proliferation assay using primary human dermal fibroblasts. The ED50 of each lot is between 10-20 ng/ml.


Less than 0.01 ng endotoxin/1 μg hIGF-II.

Product Usage Information


With carrier: Lyophilized from a 0.22 μm filtered solution of 20 mM citrate, pH 3.0 containing 100 mM NaCl and 20 μg BSA per 1 μg hIGF-II.

Storage: Stable in lyophilized state at 4°C for 1 year after receipt. Sterile stock solutions reconstituted with carrier protein are stable at 4°C for 2 months and at -20°C for 6 months. Avoid repeated freeze-thaw cycles.Maintain sterility. Storage at -20°C should be in a manual defrost freezer.

IGF-II is a potent cellular mitogen that is closely related to IGF-I (1). IGF-II is primarily produced by the liver and is frequently overexpressed in tumors (1,2). IGF-II binds to the IGF-IR, activating the AKT, mTOR, ERK, and JNK pathways (1). IGF-II signaling is regulated by several distinct mechanisms. First, IGF binding proteins (IGFBPs) bind to IGF-II and block interactions with the IGF-IR (1-3). Second, the IGF-IIR, binds to and acts as a molecular trap for IGF-II (1-3). Lastly, the IGF2 gene is an imprinted gene, and loss of imprinting leads to increased IGF-II levels (1-3). Aberrant levels of IGF-II are associated with Wilms tumor, Beckwith-Wiedmann syndrome, and colorectal cancer (1,2).

1.  Pollak, M. (2008) Nat Rev Cancer 8, 915-28.

2.  Chitnis, M.M. et al. (2008) Clin Cancer Res 14, 6364-70.

3.  Sullivan, K.A. et al. (2008) Endocrinology 149, 5963-71.

Entrez-Gene Id 3481
Swiss-Prot Acc. P01344

For Research Use Only. Not For Use In Diagnostic Procedures.
Cell Signaling Technology is a trademark of Cell Signaling Technology, Inc.

Human Insulin-like Growth Factor II (hIGF-II)