| Code | CSB-AP002221HU |
| Abbreviation | Recombinant Human LIF protein (Active) |
| MSDS | |
| Size | $142 |
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Leukemia inhibitory factor (LIF) is a pleiotropic cytokine that signals through the JAK/STAT3 and MAPK pathways, making it central to studies of immune cell differentiation, stem cell maintenance, and inflammatory signaling. This tag-free recombinant human LIF, encompassing the full mature sequence (residues 23–202), demonstrates exceptional signaling potency with an ED50 below 0.1 ng/mL in a TF-1 proliferation assay, corresponding to a specific activity exceeding 1.0 × 10⁷ IU/mg — providing a reliable reference standard for cytokine detection assays and a robust positive control for cell-based functional studies. Endotoxin levels below 1.0 EU/μg minimize LPS-driven artifacts, which supports use in sensitive immune cell activation, JAK/STAT pathway phosphorylation analyses, and in vivo inflammation models where confounding innate immune stimulation must be controlled. Purity exceeding 98% by SDS-PAGE, combined with this endotoxin profile, aligns with standards expected in antibody validation workflows including ELISA coating and immunogen applications.
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