| Code | CSB-AP001711HU |
| Abbreviation | Recombinant Human IL4 protein (Active) |
| MSDS | |
| Size | $142 |
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IL-4 is a pleiotropic cytokine central to Th2 polarization, B-cell class switching, and alternative macrophage activation, making signaling potency and endotoxin control essential for meaningful experimental results. This tag-free recombinant human IL-4, encompassing the full mature sequence (residues 25–153), demonstrates an ED50 below 0.2 ng/ml in TF-1 cell proliferation assays—corresponding to a specific activity exceeding 5.0 × 10⁶ IU/mg—which supports use in JAK1/STAT6 signaling pathway studies, Th2 differentiation assays, and primary B-cell activation experiments where precise dose-response relationships are critical. Endotoxin levels below 1.0 EU/μg, confirmed by LAL testing, minimize LPS-driven artifacts that can confound monocyte and dendritic cell functional readouts, making this preparation appropriate for in vivo inflammation models and as a reference standard in cytokine detection assays. Purity exceeding 98% by SDS-PAGE further provides a suitable basis for antibody validation workflows, including use as a coating antigen in ELISA or a positive control in western blotting.
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