Monocytes are the main source of secreted IL1; expressing mostly IL1B, while human keratinocytes express large amounts of IL1A. Overall, IL1B is the predominant form in humans while IL1A is the one in mice. Both isoforms of IL1 bind to the same receptor and therefore show similar, if not identical, biological activities. The IL1B precursor though must be processed before it can bind to the receptor. IL1 proteins are involved in the inflammatory response, being identified as endogenous pyrogens, and are reported to stimulate the release of prostaglandin and collagenase from synovial cells. A monomer, IL1B stimulates thymocyte proliferation, B-cell maturation and proliferation and fibroblast growth factor activity. Recombinant Human IL1B is expressed in human 293 cells as a monomeric glycoprotein with a molecular mass of 18 and 25 kDa
Alternative Names
EP ; IL1F2 ; Catabolin ; Lymphocyte-activating factor ; LAF ; Endogenous Pyrogen
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 mouse D10S cells was found to be ≤0.1 ng/mL.
Weight
18 and 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 Powder1x PBS
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.