Recombinant Human/Mouse/Rat Activin A

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Pricing & Details

Expression Host
Prod No.
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A213-10 µg
10 µg
In stock
Min: 1
Step: 1
A213-50 µg
50 µg
In stock
Min: 1
Step: 1
A213-500 µg
500 µg
In stock
Min: 1
Step: 1



Activin A is a member of the TGF beta super family. It was originally identified and isolated because it stimulates the release of follicle-stimulating hormone (FSH). Activins are structurally related to inhibins, they share common beta subunits, but they exhibit opposite biological activities. Activins are homodimers of beta subunits and inhibins are heterodimers of an alpha subunit and a beta subunit. Since the initial discovery of Activin A, it has been shown to regulate cell differentiation, nerve cell survival, bone growth promotion, cell proliferation, and apoptosis. Activin A expression has been detected in prostate cancer, colon cancer and breast cancer. Because Activin A is able to inhibit cell proliferation by modulating the Rb pathway, it is thought to inhibit cancer development. This may not be the only mechanism by which activin may play a preventative role in cancer development. Activin has also been shown to increase the expression of a protein whose decreased expression is correlated with increased metastatic capacity. In addition, activin has an inhibitory effect on endothelial cell growth and can thereby block angiogenesis, preventing tumor growth and metastasis.

The activin/inhibin nomenclature reflects the subunit composition of the proteins: activin A (βA - βA), activin B (βB - βB), activin AB (βA - βB), inhibin A (α - βA) and inhibin B (α - βB). At present, little is known about the contribution of the other β subunits to activin or inhibin formation and biology. At the amino acid sequence level, the mature human βA subunit is 100% identical to mouse βA, while the human and mouse α subunits share approximately 80% identity. Similarly to other TGF-β family members, activins exert their biological activities through binding to the heterodimeric complex composed of two membrane spanning serine-threonine kinases designated type I and type II. Two forms of activin receptor type I (Act RI-A and Act RI-B) and two forms of activin receptor type II (Act RII-A and Act RII-B) have been identified. Activin binds directly to Act RII, the complex then associates with Act RI and initiates signaling.

Protein Details

>95% by SDS-PAGE and analyzed by silver stain.
Endotoxin Level
<0.01 EU/µg as determined by the LAL method
Biological Activity
The biological activity of Human Activin A was determined by its ability to induce hemoglobin expression in K562 cells.1 The expected ED50=0.5 - 2.0 ng/ml.
Expression Host
Protein Accession No.
Amino Acid Sequence
glecdgkvni cckkqffvsf kdigwndwii apsgyhanyc egecpshiag tsgsslsfhs tvinhyrmrg hspfanlksc cvptklrpms mlyyddgqni ikkdiqnmiv eecgcs
N-terminal Sequence Analysis
State of Matter
Predicted Molecular Mass
The predicted molecular weight of Recombinant Human/Mouse/Rat Activin A is Mr 13 kDa. However, the actual molecular weight as observed by migration on SDS-PAGE is 14 kDa (reducing conditions) and 24 kDa (non-reducing conditions).
This recombinant protein was lyophilized from a 0.2 μm filtered solution in 35% acetonitrile (CH3CN) and 0.1% trifluoroacetic acid (TFA).
Storage and Stability
This lyophilized protein is stable for up to twelve months when stored desiccated at -20°C to -70°C. After aseptic reconstitution, this protein may be stored at 2°C to 8°C for one month or for up to three months at -20°C to -70°C in a manual defrost freezer. Avoid Repeated Freeze Thaw Cycles. See Product Insert for exact lot specific storage instructions.
Country of Origin
Next Day Ambient

References & Citations

1. Schwall, RH. et al. (1991) Method Enzymol. 198:340.
IMPORTANT Use lot specific datasheet for all technical information pertaining to this recombinant protein.
Products are for research use only. Not for use in diagnostic or therapeutic procedures.