Recombinant Human Interleukin-11 (IL11)
(Cat. No.: C006)

Background:
        IL-11 is a thrombopoietic growth factor that directly stimulates the proliferation of hematopoietic stem cells and megakaryocyte progenitor cells and induces megakaryocyte maturation resulting in increased platelet production. IL-11 is a member of a family of human growth factors which includes human growth hormone, granulocyte colony-stimulating factor and other growth factors.

Description:
        The protein is produced in P. Pichia by recombinant DNA technology. The protein has a molecular mass of approximately 19,000 Daltons and is non-glycosylated. The protein is 177 amino acids in length and differs from the 178 amino acid length of native IL-11 only in lacking the amino-terminal praline residue.

Quality Control:
        Biological activity: The ED50 as determined by the dose-dependant stimulation of the proliferation of murine 7TD1 was found to be less then 0.2ng/ml, corresponding to a Specific Activity of 8.0 x 10⁶ IU/ mg.
        Purity: Greater than 95% as determined by
                    (a) Analysis by SEC-HPLC.
                    (b) Analysis by reducing and non-reducing SDS-PAGE Silver Stained gel.
        Molecular weight: 19.2KD+/-10% determined by reduced SDS-PAGE.
        Isoelectric Point: More than 11
        UV scan: the maximal absorption wave is 278+/-3nm.
        Amino-Acid Sequence: The sequence of the first fifteen N-terminal amino acids was determined and was found to be Gly-Pro-Pro-Pro-Gly-Pro-Pro-Arg-Val-Ser-Pro-Asp-Pro- Arg-Ala.
        Residual DNA: less than 2ng/mg analysis by solid phase blot.
        Residual host cell protein: less than 0.1% analysis by ELISA.
        Endotoxin: Less than 2ng/mg (2IEU/mg) determined by LAL test.

Formulation: The protein was lyophilized from a concentrated (1mg/ml) solution with no additives.

Storage: Lyophilized rHuIL-11 although stable at room temperature for 3 weeks, should be stored desiccated below -18^oC. Upon reconstitution rHuIL-11 should be stored at 4^oC between 2-7 days and for future use below -18^oC. For long-term storage it is recommended to add a carrier protein (0.1% HSA or BSA).
        Please avoid freeze-thaw cycles.

Reconstitution: It is recommended to reconstitute the lyophilized rHuIL-11 in sterile 18MΩ-cm H₂O not less than 100µg/ml, which can then be further diluted to other aqueous solutions.