Recombinant Human Stanniocalcin 2/STC-2 Protein, CF Summary
Thr25-Arg302, with a C-terminal 6-His tag
CF stands for Carrier Free (CF). We typically add Bovine Serum Albumin (BSA) as a carrier protein to our recombinant proteins. Adding a carrier protein enhances protein stability, increases shelf-life, and allows the recombinant protein to be stored at a more dilute concentration. The carrier free version does not contain BSA.
In general, we advise purchasing the recombinant protein with BSA for use in cell or tissue culture, or as an ELISA standard. In contrast, the carrier free protein is recommended for applications, in which the presence of BSA could interfere.
|Formulation||Lyophilized from a 0.2 μm filtered solution in PBS.|
|Reconstitution||Reconstitute at 500 μg/mL in PBS.|
|Shipping||The product is shipped at ambient temperature. Upon receipt, store it immediately at the temperature recommended below.|
|Stability & Storage:||Use a manual defrost freezer and avoid repeated freeze-thaw cycles.
Recombinant Human Stanniocalcin 2/STC-2 (Catalog # 9405-SO) inhibits Recombinant Mouse Wnt-3a induced alkaline phosphatase production by MC3T3-E1 mouse preosteoblast cells. The ED50 for this effect is 60-360 ng/ml in the presence of 10 ng/ml of Recombinant Mouse Wnt‑3a (Catalog # 1324-WN).
Background: Stanniocalcin 2/STC-2
Stanniocalcin 2 (STC-2) is a secreted disulfide-linked homodimeric glycoprotein hormone that is related to the STC protein first discovered from corpuscles of stannius in fish (1). The STC-2 has 10 of its 15 cysteine residues conserved among stanniocalcin family members and is phosphorylated by casein kinase 2 exclusively on its serine residues (2). Its C-terminus contains a cluster of histidine residues which may interact with metal ions (1). STC-2 is expressed in a wide variety of tissues. In the ovary, STC-2 has been shown to be a paracrine hormone that regulates granulosa cell function (1). The amino acid sequence of human mature STC-2 is 36% identical to that of human STC-1. It is also 99% and 88% identical to that of monkey and mouse STC-2, respectively (3). STC-2 enhances mesenchymal stem cell survival (4), promotes cell proliferation in cervical cancer (5), suppresses breast cancer cell migration and invasion (6), promotes osteoblast differentiation (7), and inhibits longitudinal bone growth directly at the growth plate (8). It is also a biomarker for cervical and lung cancers (9, 10),
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- Na SS, et al. (2015) Biochim Biophys Acta. 1854:668.
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