The AlphaLISA™ Mouse CXCL1 kit is designed for the simple and rapid quantification of soluble mouse CXCL1 in cell supernatants, providing a fast no-wash alternative to traditional wash-based ELISA assays.
| Feature | Specification |
|---|---|
| Application | Protein Quantification |
| Dynamic Range | 2 - 15,000 pg/mL |
| Limit of Detection | 0.62 pg/mL |
| Limit of Quantification | 2.18 pg/mL |
| Protocol Time | 2-step |
| Sample Volume | 5 µL |
The AlphaLISA™ Mouse CXCL1 kit is designed for the simple and rapid quantification of soluble mouse CXCL1 in cell supernatants, providing a fast no-wash alternative to traditional wash-based ELISA assays.
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Mouse CXCL1 is a small peptide chemokine of 8 kDa that belongs to the CXC subfamily. It is also called growth-regulated oncogene-α (GRO-α) and keratinocyte-derived chemokine (KC). It is expressed in neutrophils, macrophages, and epithelial cells. CXCL1 produces its effect via its receptor CXCR2, mainly expressed on neutrophils. Although CXCL1 plays an important role in inflammatory responses by recruiting and activating neutrophils, aberrant expression of CXCL1 has been reported as being associated with the growth and progression of certain tumors such as breast, lung, and gastric cancers.
AlphaLISA technology allows the detection of molecules of interest in a no-wash, highly reliable, quantitative assay. In an AlphaLISA assay, a biotinylated anti-analyte antibody binds to the Streptavidin-coated Donor beads while another anti-analyte antibody is conjugated to AlphaLISA Acceptor beads. In the presence of the analyte, the beads come into close proximity. The excitation of the Donor beads causes the release of singlet oxygen molecules, triggering a cascade of energy transfer in the Acceptor beads. This results in a sharp peak of light emission at 615 nm.
The AlphaLISA Mouse CXCL1 assay is based on an AlphaLISA sandwich immunoassay involving a biotinylated anti-target antibody bound to Streptavidin-coated AlphaLISA Donor beads and an anti-target antibody conjugated to AlphaLISA Acceptor beads. In the presence of the target, both antibodies bind to CXCL1 and the beads come into proximity. The excitation of the Donor beads provokes the release of singlet oxygen molecules, triggering a cascade of energy transfer within the Acceptor beads. This results in emission with λmax at 615 nm. The intensity of the signal is directly proportional to the concentration of CXCL1 present in the sample.
The AlphaLISA CXCL1 assay can be run in a 96- or 384-well detection plate (50 µL final). As described here, samples or standards are dispensed directly into the assay plate for the detection of mCXCL1 by AlphaLISA reagents. No washing steps are necessary. The protocol can be further miniaturized or upscaled by simply resizing each addition volume proportionally.
| Kit components | Lyophilized analyte, SA-Donor Beads, Biotinylated anti-analyte, Anti-analyte conjugated Acceptor Beads, Assay Buffer |
|---|---|
| LDL & LLOQ (in Assay Buffer) | 0.62 pg/ml & 2.18 pg/mL |
| LDL & LLOQ (in DMEM) | 1.4 pg/ml & 4 pg/mL |
| LDL & LLOQ (in RPMI) | 33 pg/ml & 115 pg/mL |
| Species | Mouse, Rat (not tested on rat samples) |
| Time to result | 3 hours at RT |
The 3 samples were all measured 24 times, and the % CV was calculated for each sample. Samples were mouse recombinant CXCL1.
| Sample | [mCXCL1] (pg/mL) | CV |
|---|---|---|
| 1 | 12772 | 3% |
| 2 | 1577 | 2% |
| 3 | 166 | 2% |
| Mean CV | 2,3% |
The three samples were measured in 3 independent experiments (3 days), and the % CV was calculated for each sample. Samples were mouse recombinant CXCL1.
| Sample | [mCXCL1] (pg/mL) | CV |
|---|---|---|
| 1 | 13445 | 6% |
| 2 | 1584 | 1% |
| 3 | 165 | 2% |
| Mean CV | 3% |
Known concentrations of a standard (exogenous analyte) were spiked into NIH-3T3 cell supernatant medium containing the endogenous analyte. Non-spiked and spiked samples were measured in the assay.
| Sample type | [Endogenous mCXCL1] in sample (pg/mL) | [Exogenous mCXCL1] spiked into sample (pg/mL) | Expected [mCXCL1] in spiked sample (pg/mL) | Measured [mCXCL1] in spiked sample (pg/mL) | Recovery (%) |
|---|---|---|---|---|---|
| Sample 1 | 869 | 459 | 1328 | 1130 | 85 |
| Sample 2 | 869 | 1571 | 2439 | 1968 | 81 |
| Sample 3 | 869 | 4422 | 5291 | 5117 | 97 |
A mouse CXCL1 sample collected from NIH-3T3 supernatant was serially diluted. Concentrations of CXCL1 in neat and diluted samples were determined.
| Sample dilution factor | Expected [mCXCL1] (pg/mL) | Measured [mCXCL1] (pg/mL) | Dilution Recovery (%) |
|---|---|---|---|
| neat | - | 903 | - |
| 2 | 452 | 465 | 103% |
| 4 | 226 | 239 | 106% |
| 8 | 113 | 118 | 105% |
| 16 | 53 | 63 | 112% |
| 32 | 28 | 31 | 110% |
| 64 | 14 | 13,7 | 97% |
Cross reactivity was assessed using recombinant proteins and tested at 18 000 pg/mL. The assay is compatible with rat CXCL1.
| Target | Cross reactivity |
|---|---|
| Rat CXCL1 | 100% |
| Human CXCL1 | 0 |
| Mouse CXCL2 | 0 |
| Human CXCL2 | 0 |
| Mouse CXCL3 | 0 |
| Human CXCL3 | 0 |
NIH-3T3 murine fibroblast cells were plated in a 96-well culture plate at serial densities ranging from 200k cells/well to 12.5k cells/well in DMEM medium with 10% FBS for 24h at 37°C. Then 5 µL of supernatant were transferred into an AlphaPlate-384 to measure the concentration of secreted CXCL1. The standard curve was prepared in DMEM medium + 10% FBS. All other assay components were diluted in AlphaLISA Assay Buffer 1 and added to the wells using the kit protocol. AlphaLISA counts were measured, and the CXCL1 concentration in each supernatant sample was interpolated from the standard curve.
NIH-3T3 cells were plated in a 96-well culture-treated plate at a density of 12.5k cells per well and allowed to adhere in complete DMEM+10%FBS culture medium for 24h at 37°C. Subsequently, the cells were exposed to increasing concentrations of LPS for 3h at 37°C, 5% CO2. Following treatment, 5 µL of supernatant were transferred into an AlphaPlate-384 to measure the concentration of secreted CXCL1. The standard curve was prepared in DMEM +10% FBS. All other assay components were diluted in AlphaLISA Assay Buffer 1 and added to the wells using the kit protocol. AlphaLISA counts were measured, and the CXCL1 concentration in each supernatant sample was interpolated from the standard curve.
| Application |
Protein Quantification
|
|---|---|
| Automation Compatible |
Yes
|
| Brand |
AlphaLISA
|
| Cellular or Signaling Pathway |
GPCR signaling
|
| Detection Modality |
Alpha
|
| Dynamic Range |
2 - 15,000 pg/mL
|
| Limit of Detection |
0.62 pg/mL
|
| Limit of Quantification |
2.18 pg/mL
|
| Lysis Buffer Compatibility |
AlphaLISA Assay Buffer 1
|
| Product Group |
Kit
|
| Protocol Time |
2-step
|
| Sample Volume |
5 µL
|
| Shipping Conditions |
Shipped in Dry Ice
|
| Target |
CXCL1
|
| Target Class |
Cytokines
|
| Target Species |
Mouse
|
| Technology |
Alpha
|
| Therapeutic Area |
Immuno-oncology
Inflammation
Oncology
|
| Unit Size |
5,000 assay points
|
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