| Field | Specification |
|---|---|
| Target | |
| Alternative names | FAP-IL2v, RO6874281/RG7461 |
| UniProt # | |
| Reactivity | |
| Applications | |
| Assay type | |
| Sample type(s) | Plasma, Serum |
| Sensitivity | |
| Detection range | |
| Detection method | |
| Storage | |
| Shipping | |
| Catalog no. (Mfr.) | |
| Main SKU |
Assay Principle
Simlukafusp Alfa ELISA Kit provides plate-based quantitative measurement of Simlukafusp Alfa. Each run carries its own standard series, so results remain comparable across plates, days, and operators in a research workflow.
Background
Simlukafusp alfa (FAP-IL2v, RO6874281/RG7461) is an immunocytokine comprising an antibody against fibroblast activation protein 伪 (FAP) and an IL-2 variant with a retained affinity for IL-2R尾纬 > IL-2 R尾纬 and abolished binding to IL-2 R伪. Here, we investigated the immunostimulatory properties of FAP-IL2v and its combination with programmed cell death protein 1 (PD-1) checkpoint inhibition, CD40 agonism, T cell bispecific and antibody-dependent cellular cytotoxicity (ADCC)-mediating antibodies. The binding and immunostimulatory properties of FAP-IL2v were investigated in vitro and compared with FAP-IL2wt. Tumor targeting was investigated in tumor-bearing mice and in a rhesus monkey. The ability of FAP-IL2v to potentiate the efficacy of different immunotherapies was investigated in different xenograft and syngeneic murine tumor models. FAP-IL2v bound IL-2 R尾纬 and FAP with high affinity in vitro, inducing dose-dependent proliferation of natural killer (NK) cells and CD4+/CD8+ T cells while being significantly less potent than FAP-IL2wt in activating immunosuppressive regulatory T cells (Tregs). T cells activated by FAP-IL2v were less sensitive to Fas-mediated apoptosis than those activated by FAP-IL2wt. Imaging studies demonstrated improved tumor targeting of FAP-IL2v compared to FAP-IL2wt. Furthermore, FAP-IL2v significantly enhanced the in vitro and in vivo activity of therapeutic antibodies that mediate antibody-dependent or T cell-dependent cellular cytotoxicity (TDCC) and of programmed death-ligand 1 (PD-L1) checkpoint inhibition. The triple combination of FAP-IL2v with an anti-PD-L1 antibody and an agonistic CD40 antibody was most efficacious. These data indicate that FAP-IL2v is a potent immunocytokine that potentiates the efficacy of different T- and NK-cell-based cancer immunotherapies.
Specifications
| Assay Type | Quantitative Colorimetric ELISA |
|---|---|
| Detection Method | Colorimetric |
| Plate Format | 96-well (96T) |
| Sample Types | Plasma, Serum |
| Sensitivity | 0.156 μg/mL |
| Detection Range | 0.31-5 μg/mL |
| Recovery | 80-120% |
| Stability & Storage | The stability of ELISA kit is determined by the loss rate of activity. The loss rate of this kit is less than 10% prior to the expiration date under appropriate storage condition. |
| Shipping | 2-8 °C |
| UniProt | Q12884 |
| Alternative Names | FAP-IL2v, RO6874281/RG7461 |
Performance Data
The kit provides a quantitative range of 0.31-5 μg/mL, an analytical sensitivity of 0.156 μg/mL, typical spike recovery of 80-120%. Plan sample dilutions so readouts fall within the linear portion of the standard curve, and evaluate matrix effects with dilution-linearity and spike-recovery controls.
Target Notes
The target is also referenced in the literature as FAP-IL2v, RO6874281/RG7461. Curated target information is available under UniProt accession Q12884.
Common Research Applications
- Pharmacokinetic profiling of the drug in preclinical and translational research models
- Bioanalytical method development, bridging, and comparability studies
- Stability and formulation studies requiring reproducible concentration readouts
Safety & Handling
For Research Use Only. Not for diagnostic or therapeutic use. Handle all reagents and samples according to your institution's laboratory safety guidelines, and store components as recommended to preserve assay performance.
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