| Code | CSB-MP011659HU-WD |
| Abbreviation | Recombinant Human IL-4 protein (Active) |
| MSDS | |
| Size | Inquiry |
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IL-4 orchestrates Th2 differentiation and B-cell class switching, making its signaling potency a critical parameter for any functional study of adaptive immunity. This tag-free human IL-4, spanning the complete mature protein sequence (aa 25–153), demonstrates robust bioactivity with an ED50 ≤ 0.2 ng/mL in TF-1 cell proliferation assays, corresponding to a specific activity exceeding 1 × 10⁷ units/mg — a level that supports sensitive dose-response experiments in primary T-cell differentiation, B-cell activation, and JAK/STAT6 signaling pathway analyses. Endotoxin content ≤ 10 EU/mg satisfies the stringent criteria expected for immune cell assays, where LPS contamination can confound cytokine-driven responses and obscure IL-4–specific effects. The combination of high specific activity and greater than 95% purity provides a suitable basis for use as a reference standard in cytokine detection platforms, as a coating antigen in ELISA development, and as a functional reagent in chemotaxis or macrophage polarization studies.
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