LEADGMP^® IL-2 (Interleukin-2), Human

• Catalog number
  60701GMP / 60702GMP
• Package
  100 μg / 1 mg
• Species
  Human
• Tag
  polyhistidine tag at the C-terminus
• Endotoxin level
  <0.01 EU per 1 μg of the protein by the LAL method.
• Formulation
  The protein was lyophilized from a solution containing 1X PBS, pH 8.0.

Escherichia coli
Animal-free reagent and laboratory
Manufactured and tested under GMP guideline

Interleukin-2 (IL-2) is a 15.5 kDa four bundle, immuno-modulatory cytokine which is expressed predominately by antigen-simulated CD4+ T cells, CD8+ T cells, natural killer (NK) cells, and dendritic cells (DC). IL-2 plays a fundamental role in promoting NK cell proliferation, cytotoxicity, and B cells differentiation. IL-2 modulate T cell differentiation programs, promoting naïve CD4+ T cell differentiation into T helper-1 (Th1) and T helper-2 (Th2) cells.

Measure by its ability to induce proliferation in CTLL-2 cells.
The ED₅₀ for this effect is <3 ng/mL.
The specific activity of recombinant human IL-2 is approximately >5 x 10⁶ IU/mg.
Measure by its ability to induce proliferation in NK cells.
The ED₅₀ for this effect is <46 ng/mL.

Lyophilized protein should be stored at -20°C.
This product is stable for one year upon receipt, when handled and stored as instructed.
Upon reconstitution, protein aliquots should be stored at -20°C or -80°C.
Avoid repeated freeze/thaw cycles.

1. Malek TR. (2008) Annu Rev Immunol. 26: 453-79.
2. Gaffen SL, Liu KD. (2004) Cytokine. 28,3: 109‐23.
3. Varas A et al. (1998) Dev Immunol. 6,1-2: 141-7.
4. Abbas AK et al. (2018) Sci Immunol. 3,25: eaat1482.

1. Keep ampoules at -20°C or -80°C for storage.
2. No needs to spin the ampoule before opening. Remove the cap carefully.
3. Dissolve the lyophilized protein by adding sterile ddH₂O along the inner side of ampoule to avoid generating bubbles. Make protein concentration to be at 100 μg/mL, or consult product’s Certificate of Analysis (CoA). (Note: No needs to add carriers* to the initial reconstitution solution). Wear gloves when manipulating the sample to prevent contamination from proteases that may degrade the reconstituted protein.
4. Leave the reconstituted protein solution at room temperature for at least 20 minutes.
5. Pipet the solution gently. The solution should be clear if proteins are fully dissolved. (Important Note: Do Not Vortex! Vigorous shaking may impair biological activity of protein.)
6. Use the reconstituted solution immediately, or make aliquots and store at -20 °C. (Important Note: Avoid repeated freeze-thaw cycles)
7. We recommend diluting the initial reconstitution solution to working concentration with buffers or medium containing carriers*. (Important Note: Do not use water for dilution, which may cause protein degradation.)

*Carriers: 0.1% BSA, 5% HSA or 10% FBS.