| Field | Specification |
|---|---|
| Target | |
| Alternative names | Platelet factor 4;PF-4;C-X-C motif chemokine 4;Pf4;Cxcl4, Scyb4; |
| Gene ID | |
| UniProt # | |
| Reactivity | |
| Applications | |
| Immunogen | Expression system for standard: E.coli; Immunogen sequence: V30-S105 |
| Expression system | |
| Expression region | |
| Assay type | |
| Sample type(s) | Cell Culture Supernatant, Cell Lysate, Serum, Plasma |
| Sensitivity | |
| Detection range | |
| Assay time | |
| Storage | |
| Catalog no. (Mfr.) | |
| Main SKU |
Assay Principle
This sandwich ELISA quantifies mouse platelet factor 4 (gene Pf4) in cell culture supernatants, cell lysates, serum and plasma (heparin, EDTA). Strips are pre-coated with a capture antibody. After the sample is added, a biotinylated detection antibody binds the captured protein, and an avidin–biotin–peroxidase complex supplies the enzyme. TMB develops color in proportion to the bound target; the reaction is stopped and read at 450 nm, and concentrations are read from the standard curve.
Platelet factor 4 (PF4, CXCL4) is a CXC chemokine stored in platelet α-granules and released on platelet activation. It binds heparin tightly, neutralizing its anticoagulant effect, and signals through receptors such as CXCR3 to affect leukocytes, endothelial cells and hematopoietic stem cells. PF4-heparin complexes are the target of antibodies in heparin-induced thrombocytopenia.
Kit Components
| Anti-Mouse Pf4 Pre-coated 96-well strip microplate | 1 plate (96 wells) |
|---|---|
| Mouse Pf4 Standard | 2 vials, 10 ng/tube |
| Mouse Pf4 Biotinylated antibody (100x) | 100 µL |
| Avidin-Biotin-Peroxidase Complex (100x) | 100 µL |
| Sample Diluent | 30 mL |
| Antibody Diluent | 12 mL |
| Avidin-Biotin-Peroxidase Diluent | 12 mL |
| Color Developing Reagent (TMB) | 10 mL |
| Stop Solution | 10 mL |
| Wash Buffer (25x) | 20 mL |
| Adhesive plate sealers | 4 |
Also required (not supplied): microplate reader for 450 nm; incubator; automated plate washer (optional); precision pipettes for 0.5 µL through 1 mL volumes of aqueous solutions; multichannel pipettes (recommended for many samples); deionized or distilled water; 500 mL graduated cylinders; test tubes for dilution.
Kit components are not sold separately.
Performance Data
| Species | Mouse |
|---|---|
| Sample types | Cell culture supernatants, cell lysates, serum and plasma (heparin, EDTA) |
| Assay range | 15.6 pg/mL–1,000 pg/mL |
| Sensitivity | <1 pg/mL |
| Standard | Recombinant mouse Pf4 (Val30–Ser105), expressed in E. coli |
| Cross-reactivity | None detected against related proteins in supplier testing |
| Intra-assay CV | 4.2–6.6% (3 samples, n = 16 each) |
| Inter-assay CV | 6.0–7.2% (3 samples, n = 24 each) |
| Format | 96 wells, removable strips |
Sample dilution: start at 1:200000. In the supplier’s tests, serum and plasma samples measured 10–40 µg/mL.
Example standard curve (OD450, pg/mL): 0 = 0.013; 15.6 = 0.036; 31.2 = 0.07; 62.5 = 0.127; 125 = 0.236; 250 = 0.469; 500 = 0.913; 1000 = 1.819. Run a new standard curve on every plate.
Storage & Handling
Store at 4 °C for up to 6 months or −20 °C for up to 12 months. Avoid repeated freeze–thaw cycles. Ships on gel ice and tolerates up to 3 days at room temperature; freeze on arrival.
Safety
Sample data
| Concentration (pg/ml) | 0 | 15.6 | 31.2 | 62.5 | 125 | 250 | 500 | 1000 |
| O.D. | 0.013 | 0.036 | 0.07 | 0.127 | 0.236 | 0.469 | 0.913 | 1.819 |
Intra/inter assay consistency
| Intra-Assay Precision | Inter-Assay Precision | |||||
|---|---|---|---|---|---|---|
| Sample | 1 | 2 | 3 | 1 | 2 | 3 |
| n | 16 | 16 | 16 | 24 | 24 | 24 |
| Mean (pg/ml) | 32 | 263 | 425 | 33 | 253 | 425 |
| Standard deviation | 1.69 | 11.04 | 28.05 | 2.27 | 17.28 | 30.6 |
| CV (%) | 5.3% | 4.2% | 6.6% | 6.9% | 6% | 7.2% |
Kit components
Description|Quantity Pre-coated 96-well strip microplate|1 Standard|2 vials Biotinylated antibody (100x)|100ul Avidin-Biotin-Peroxidase Complex (100x)|100ul Sample Diluent|30ml Antibody Diluent|12ml Avidin-Biotin-Peroxidase Diluent|12ml Color Developing Reagent (TMB)|10ml Stop Solution|10ml Wash Buffer (25x)|20ml Adhesive plate sealers|4Materials required but not provided
- Microplate Reader capable of reading absorbance at 450nm.
- Incubator.
- Automated plate washer (optional).
- Pipettes and pipette tips capable of precisely dispensing 0.5 µl through 1 ml volumes of aqueous solutions.
- Multichannel pipettes are recommended for large amount of samples.
- Deionized or distilled water.
- 500ml graduated cylinders.
- Test tubes for dilution.
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Yi-Heng Li et al. (2026) Platelet factors 4 produces an antidepressant effect in mice via inhibition of neuroinflammation. Journal of Advanced Research. 10.1016/j.jare.2026.04.037
Huan-Yu Wang et al. (2024) C5aR1-positive adipocytes mediate non-shivering thermogenesis in neonatal mice. iScience. 10.1016/j.isci.2024.111261
Tianwei Zhan et al. (2020) Cangrelor alleviates bleomycin-induced pulmonary fibrosis by inhibiting platelet activation in mice. Molecular Immunology. 10.1016/j.molimm.2020.01.017
Tao Xu et al. (2020) CXCL4 promoted the production of CD4+CD25+FOXP3+treg cells in mouse sepsis model through regulating STAT5/FOXP3 pathway. Autoimmunity. 10.1080/08916934.2020.1777283
