|Detection range:||31.25-2000 pg/mL|
|Sample type:||Serum, plasma and other biological fluids|
|Repeatability:||CV < 15%|
|Specificity:||This kit recognizes Human CK-18/KRT18 in samples. No significant cross-reactivity or interference between Human CK-18/KRT18 and analogues was observed.|
This kit uses Sandwich-CLIA as the method. The micro CLIA plate provided in this kit has been pre-coated with an antibody specific to Human CK-18/KRT18. Standards or samples are added to the appropriate micro CLIA plate wells and combined with the specific antibody. Then a biotinylated detection antibody specific for Human CK-18/KRT18 and Avidin-Horseradish Peroxidase (HRP) conjugate are added to each micro plate well successively and incubated. Free components are washed away. The substrate solution is added to each well. Only those wells that contain Human CK-18/KRT18, biotinylated detection antibody and Avidin-HRP conjugate will appear fluorescence. The Relative light unit (RLU) value is measured spectrophotometrically by the Chemiluminescence immunoassay analyzer. The RLU value is positively associated with the concentration of Human CK-18/KRT18. The concentration of Human CK-18/KRT18 in the samples can be calculated by comparing the RLU of the samples to the standard curve.
|UniProt Protein Function:||K18: a type I cytoskeletal keratin. The keratins are intermediate filament proteins responsible for the structural integrity of epithelial cells and are subdivided into cytokeratins and hair keratins. Keratin 18 and its filament partner keratin 8 are perhaps the most commonly found members of the intermediate filament gene family. They are expressed in single layer epithelial tissues of the body. Defects are a cause of cryptogenic cirrhosis.|
|UniProt Protein Details:|
Protein type:Nucleolus; Cytoskeletal
Chromosomal Location of Human Ortholog: 12q13
Cellular Component: cytoplasm; intermediate filament; keratin filament; microtubule organizing center; nucleolus; perinuclear region of cytoplasm
Molecular Function:protein binding; structural molecule activity
Biological Process: anatomical structure morphogenesis; cell cycle; Golgi to plasma membrane CFTR protein transport; intermediate filament cytoskeleton organization and biogenesis; negative regulation of apoptosis; tumor necrosis factor-mediated signaling pathway; viral reproduction
Disease: Cirrhosis, Familial
|NCBI Summary:||KRT18 encodes the type I intermediate filament chain keratin 18. Keratin 18, together with its filament partner keratin 8, are perhaps the most commonly found members of the intermediate filament gene family. They are expressed in single layer epithelial tissues of the body. Mutations in this gene have been linked to cryptogenic cirrhosis. Two transcript variants encoding the same protein have been found for this gene. [provided by RefSeq, Jul 2008]|
|NCBI GenInfo Identifier:||125083|
|NCBI Gene ID:||3875|
|NCBI Accession:||P05783. 2|
|UniProt Secondary Accession:||P05783,Q53G38, Q5U0N8, Q9BW26,|
|UniProt Related Accession:||P05783|
|NCBI Full Name:||Keratin, type I cytoskeletal 18|
|NCBI Synonym Full Names:||keratin 18|
|NCBI Official Symbol:||KRT18|
|NCBI Official Synonym Symbols:||K18; CK-18; CYK18|
|NCBI Protein Information:||keratin, type I cytoskeletal 18|
|UniProt Protein Name:||Keratin, type I cytoskeletal 18|
|UniProt Synonym Protein Names:||Cell proliferation-inducing gene 46 protein; Cytokeratin-18; CK-18; Keratin-18; K18|
|UniProt Gene Name:||KRT18|
|UniProt Entry Name:||K1C18_HUMAN|
As the RLU values of the standard curve may vary according to the conditions of the actual assay performance (e. g. operator, pipetting technique, washing technique or temperature effects), the operator should establish a standard curve for each test. Typical standard curve and data is provided below for reference only.
Intra-assay Precision (Precision within an assay): 3 samples with low, mid range and high level Human CK-18/KRT18 were tested 20 times on one plate, respectively.
Inter-assay Precision (Precision between assays): 3 samples with low, mid range and high level Human CK-18/KRT18 were tested on 3 different plates, 20 replicates in each plate.
|Intra-assay Precision||Inter-assay Precision|
|C V (%)||9.10||11.12||8.62||11.06||9.92||7.18|
The recovery of Human CK-18/KRT18 spiked at three different levels in samples throughout the range of the assay was evaluated in various matrices.
|Sample Type||Range (%)||Average Recovery (%)|
|EDTA plasma (n=5)||100-116||106|
|Cell culture media (n=5)||92-108||99|
Samples were spiked with high concentrations of Human CK-18/KRT18 and diluted with Reference Standard & Sample Diluent to produce samples with values within the range of the assay.
|Serum (n=5)||EDTA plasma (n=5)||Cell culture media (n=5)|
An unopened kit can be stored at 4°C for 1 month. If the kit is not used within 1 month, store the items separately according to the following conditions once the kit is received.
|Micro CLIA Plate(Dismountable)||8 wells ×12 strips||-20°C, 6 months|
|Reference Standard||2 vials|
|Concentrated Biotinylated Detection Ab (100×)||1 vial, 120 µL|
|Concentrated HRP Conjugate (100×)||1 vial, 120 µL||-20°C(shading light), 6 months|
|Reference Standard & Sample Diluent||1 vial, 20 mL||4°C, 6 months|
|Biotinylated Detection Ab Diluent||1 vial, 14 mL|
|HRP Conjugate Diluent||1 vial, 14 mL|
|Concentrated Wash Buffer (25×)||1 vial, 30 mL|
|Substrate Reagent A||1 vial, 5 mL||4°C (shading light)|
|Substrate Reagent B||1 vial, 5 mL||4°C (shading light)|
|Plate Sealer||5 pieces|
|Product Description||1 copy|
|Certificate of Analysis||1 copy|
- Set standard, test sample and control (zero) wells on the pre-coated plate and record theirpositions. It is recommended to measure each standard and sample in duplicate. Note: addall solutions to the bottom of the plate wells while avoiding contact with the well walls. Ensuresolutions do not foam when adding to the wells.
- Aliquot 100 µL of standard solutions into the standard wells.
- Add 100 µL of Sample / Standard dilution buffer into the control (zero) well.
- Add 100 µL of properly diluted sample (serum, plasma, tissue homogenates and otherbiological fluids. ) into test sample wells.
- Cover the plate with the sealer provided in the kit and incubate for 90 min at 37 °C.
- Aspirate the liquid from each well, do not wash. Immediately add 100 µL of BiotinylatedDetection Ab working solution to each well. Cover the plate with a plate seal and gently mix. Incubate for 1 hour at 37 °C.
- Aspirate or decant the solution from the plate and add 350 µL of wash buffer to each welland incubate for 1-2 minutes at room temperature. Aspirate the solution from each well andclap the plate on absorbent filter paper to dry. Repeat this process 3 times. Note: a microplatewasher can be used in this step and other wash steps.
- Add 100 µL of HRP Conjugate working solution to each well. Cover with a plate seal andincubate for 30 min at 37 °C.
- Aspirate or decant the solution from each well. Repeat the wash process for five times asconducted in step 7.
- Add 100 µL of Substrate mixture solution to each well. Cover with a new plate seal andincubate for no more than 5 min at 37 °C. Protect the plate from light.
- Determine the RLU value of each well immediately.