Expression system: E. coli
Endotoxin: < 0.2 EU/μg of protein by gel coagulation
Purity: >95% by SDS-PAGE analysis
Apparent molecular weight: ~18.6 kDa on SDS-PAGE under reducing conditions
Storage and Stability: This product is stable for up to 6 months at temperatures below -70°C after receipt. After reconstitution, the product should be stable for 1 week at 4°C or for 3 months at -20°C. For long-term storage, the addition of a carrier protein (e.g. 0.1% BSA) is recommended. Avoid repeated freeze-thaw cycles.
Bioactivity: TNF is secreted by macrophages, monocytes, neutrophils, T cells, and NK cells upon stimulation by bacterial LPS. Cells expressing CD4 secrete TNF-α, while CD8 cells secrete little or no TNF-α. TNF-α synthesis is induced by many different stimuli, including interferon, IL2, and GM-CSF. TNF-β is a potent mediator of inflammatory and immune responses. It belongs to the TNF family of ligands and signals through TNFR1 and TNFR2. TNF-β is produced by activated T and B lymphocytes and has similar activity to TNF-α. It mediates a large number of inflammatory, immunostimulatory and antiviral responses.
|Solubility (25°C)||Reconstitute the lyophilized powder in ddH₂O or PBS up to 100 μg/ml.|
Powder -20°C 3 years ; 4°C 2 years
In solvent -80°C 6 months ; -20°C 1 month
|Body Surface Area (m2)||0.007||0.025||0.15||0.05||0.02||0.5|
|Animal A (mg/kg) = Animal B (mg/kg) multiplied by||Animal B Km|
|Animal A Km|
For example, to modify the dose of Compound A used for a mouse (20 mg/kg) to a dose based on the BSA for a rat, multiply 20 mg/kg by the Km factor for a mouse and then divide by the Km factor for a rat. This calculation results in a rat equivalent dose for Compound A of 10 mg/kg.
 Hossein Safarpour, et al. Int J Biol Macromol. Expression analysis and ATR-FTIR characterization of the secondary structure of recombinant human TNF-α from Escherichia coli SHuffle® T7 Express and BL21 (DE3) cells
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