Insulin-like growth factor 2 (IGF2) is one of the mitogenic, polypeptide growth factors that belongs to the insulin family, due to its structural and functional similarity to insulin. IGF2 is mainly produced in the liver and several other tissues at certain times. IGF2 expression can be found in many tissues usually with autocrine, paracrine and endocrine functions, and mainly acts as a growth promoting hormone during gestation. The pro-IGF-II proteins make up 10-20% of circulating IGF2 and is converted to mature IGF2 by sequential cleavage at amino acids 104, 87 and 67. Pro-IGF-II proteins are secreted by some tumour cell lines and levels are elevated in non-islet cell tumour hypoglycaemia. Recombiant Human pro-IGF-II is expressed in human 293 cells as a monomeric glycoprotein with a molecular mass of 25 kDa.
Alternative Names
Pro-Insulin like Growth Factor-2 ; pro-IGF2.
Quantity
100 µg
Regulatory
RUO
Source
HEK293
Host
Human
Endotoxin Level
<1 EU/µg of recombinant protein as determined by the LAL method
Biological Activity Comment
The EC(50) as determined by the dose-dependent stimulation of the proliferation of MCF-7 cells (human breast cancer cell line) was found to be ≤ 50 ng/mL.
Weight
25 kDa, monomer, glycosylated
Description
A quick spin of the vial followed by reconstitution in sterile 1xPBS containing 0.1% endotoxin-free recombinant human serum albumin (HSA).
Format
Lyophilized Powder10 mM Tris-HCl pH 7.4 + 350 mM NaCl
Purity
>95% as determined by SDS-PAGE
Storage
The lyophilized protein is stable for at least one year from date of receipt at -70°C. Upon reconstitution, this cytokine can be stored in working aliquots at 2° - 8°C for one month, or at -20°C for six months. Avoid repeated freeze/thaw cycles.