Olink

Olink®
Part of Thermo Fisher Scientific

NEUROLOGY

Gene
CXCL8

Uniprot
P10145

Protein
Interleukin-8

See alternative names IL8/NAP1 form II,
(Ala-IL-8)77,
IL8/NAP1 form I,
GCP/IL-8 protein IV,
T-cell chemotactic factor,
Neutrophil-activating protein 1,
Monocyte-derived neutrophil-activating peptide,
Monocyte-derived neutrophil chemotactic factor,
Protein 3-10C,
MDNCF-b,
(Ser-IL-8)72,
GCP/IL-8 protein I,
IL8/NAP1 form III,
Lymphocyte-derived neutrophil-activating factor,
MDNCF-c,
Neutrophil-activating factor,
GCP/IL-8 protein V,
IL8/NAP1 form IV,
GCP/IL-8 protein VI,
IL8/NAP1 form V,
GCP/IL-8 protein III,
IL8/NAP1 form VI,
GCP/IL-8 protein II,
Chemokine (C-X-C motif) ligand 8,
C-X-C motif chemokine 8,
IL-8(1-77),
Granulocyte chemotactic protein 1,
Emoctakin

Uniprot Function Description

IL-8 is a chemotactic factor that attracts neutrophils, basophils, and T-cells, but not monocytes. It is also involved in neutrophil activation. It is released from several cell types in response to an inflammatory stimulus. IL-8(6-77) has a 5-10-fold higher activity on neutrophil activation, IL-8(5-77) has increased activity on neutrophil activation and IL-8(7-77) has a higher affinity to receptors CXCR1 and CXCR2 as compared to IL-8(1-77), respectively.

Sample type

Human EDTA plasma and serum are the recommended sample types. Human citrate plasma and heparin plasma are also accepted. For other samples types e.g cerebrospinal fluid, (CSF), tissue or cell lysates please we recommend Olink Target 96 panels. Please note that protein expression levels are expected to vary in different sample types and certain assays may be affected by interfering substances such as hemolysate.

Precision

Precision (repeatability) is calculated from linearized NPX values over LOD.

Within run precision Coefficient of Variation (CV)
7%
Between run precision Coefficient of Variation (CV)
5%

Analytical measuring range

The technical data reported below refers to the measured value in the in vitro validation assays run using known concentrations of recombinant antigen. Please note that these figures are for reference only and CANNOT be used to convert NPX values to absolute concentrations for proteins measured in plasma or serum samples.

LOD (pg/mL)
0.2
LLOQ (pg/mL)
0.4
ULOQ (pg/mL)
1563
Hook (pg/mL)
6250
Range (logs)
3.6

Dilution factor

For optimal assay readout, Olink Explore is run using different dilutions of the original samples (undiluted, 1:10, 1:100 or 1:1000). The dilution factor for this assay is noted below and should be taken into account when estimating the appropriate addressable biological concentration of the protein based on the in vitro validation data.

Dilution factor
1:1

Sensitivity plot

The calibrator curve shown below visualizes the analytical measuring range data based on in vitro measurement of recombinant antigen. Please note that this is shown for reference only and CANNOT be used to convert NPX values to absolute concentrations for proteins measured in plasma or serum samples. The vertical dotted lines represent LLOQ and ULOQ respectively, and the horizontal line indicates the LOD.

10⁻⁵10⁻⁴10⁻³10⁻²10⁻¹10⁰10¹10²10³10⁴10⁵121086420−2−4−6pg/mLNPXReplicate4PLLODLLOQULOQ

Sample distribution plot

The plot below shows the levels of protein measured in a number of commercial plasma samples. Healthy subjects are shown in blue and samples obtained from patients with a range of diseases are shown in red. The latter include inflammatory, cardiovascular, autoimmune & neurological diseases, as well as cancer. The data is shown to give a general idea of the sort of data range to expect, but cannot cover all potential levels that may be seen in clinical samples.

121086420−2−4−6NPXControl SamplesDisease Samples