ELISA Kit for Fibroblast Growth Factor 15 (FGF15)

Specificity

This assay has high sensitivity and excellent specificity for detection of Fibroblast Growth Factor 15 (FGF15).
No significant cross-reactivity or interference between Fibroblast Growth Factor 15 (FGF15) and analogues was observed.

Recovery

Matrices listed below were spiked with certain level of recombinant Fibroblast Growth Factor 15 (FGF15) and the recovery rates were calculated by comparing the measured value to the expected amount of Fibroblast Growth Factor 15 (FGF15) in samples.

Matrix Recovery range (%) Average(%)
serum(n=5) 80-101 80
EDTA plasma(n=5) 81-98 93
heparin plasma(n=5) 98-105 101

Precision

Intra-assay Precision (Precision within an assay): 3 samples with low, middle and high level Fibroblast Growth Factor 15 (FGF15) were tested 20 times on one plate, respectively.
Inter-assay Precision (Precision between assays): 3 samples with low, middle and high level Fibroblast Growth Factor 15 (FGF15) were tested on 3 different plates, 8 replicates in each plate.
CV(%) = SD/meanX100
Intra-Assay: CV<10%
Inter-Assay: CV<12%

Linearity

The linearity of the kit was assayed by testing samples spiked with appropriate concentration of Fibroblast Growth Factor 15 (FGF15) and their serial dilutions. The results were demonstrated by the percentage of calculated concentration to the expected.

Sample 1:2 1:4 1:8 1:16
serum(n=5) 90-98% 96-104% 98-105% 89-103%
EDTA plasma(n=5) 87-98% 79-95% 85-104% 78-102%
heparin plasma(n=5) 79-99% 89-104% 99-105% 80-96%

Stability

The stability of kit is determined by the loss rate of activity. The loss rate of this kit is less than 5% within the expiration date under appropriate storage condition.
To minimize extra influence on the performance, operation procedures and lab conditions, especially room temperature, air humidity, incubator temperature should be strictly controlled. It is also strongly suggested that the whole assay is performed by the same operator from the beginning to the end.

Reagents and materials provided

Reagents Quantity Reagents Quantity
Pre-coated, ready to use 96-well strip plate 1 Plate sealer for 96 wells 4
Standard 2 Standard Diluent 1×20mL
Detection Reagent A 1 Assay Diluent A 1×12mL
Detection Reagent B 1×120µL Assay Diluent B 1×12mL
Reagent Diluent 1×300µL Stop Solution 1×6mL
TMB Substrate 1×9mL Instruction manual 1
Wash Buffer (30 × concentrate) 1×20mL

Assay procedure summary

1. Prepare all reagents, samples and standards;
2. Add 50µL standard or sample to each well.
    And then add 50µL prepared Detection Reagent A immediately.
    Shake and mix. Incubate 1 hour at 37°C;
3. Aspirate and wash 3 times;
4. Add 100µL prepared Detection Reagent B. Incubate 30 minutes at 37°C;
5. Aspirate and wash 5 times;
6. Add 90µL Substrate Solution. Incubate 10-20 minutes at 37°C;
7. Add 50µL Stop Solution. Read at 450 nm immediately.

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Magazine Citations
Endocrinology. Naringenin Prevents Obesity, Hepatic Steatosis, and Glucose Intolerance in Male Mice Independent of Fibroblast Growth Factor 21 PubMed: 25774553
Inflammatory Bowel Diseases Alterations in Enterohepatic Fgf15 Signaling and Changes in Bile Acid Composition Depend on Localization of Murine Intestinal Inflammation pubmed:27580383
J Lipid Res. Commensal bacteria at the crossroad between cholesterol homeostasis and chronic inflammation in atherosclerosis. pubmed:28130274
BMC Endocrine Disorders The relationship between bile acid concentration, glucagon-like-peptide 1, fibroblast growth factor 15 and bile acid receptors in rats during progression of glucose intolerance 10.1186/s12902-017-0211-5
Journal of Physiology and Biochemistry The ileal FGF15/19 to hepatic FGFR4 axis regulates liver regeneration after partial hepatectomy in mice Pubmed:29468415
Developmental Cell FGF15 Activates Hippo Signaling to Suppress Bile Acid Metabolism and Liver Tumorigenesis Pubmed: 30745141
Endocrinology Interactions between the gravitostat and the fibroblast growth factor system for the regulation of body weight
Food & Function Lactoferrin promotes bile acid metabolism and reduces hepatic cholesterol deposition by inhibiting the farnesoid X receptor (FXR)-mediated enterohepatic axis Pubmed: 31626262
Journal of Translational Medicine Gut microbiota from coronary artery disease patients contributes to vascular dysfunction in mice by regulating bile acid metabolism and immune activation Pubmed: 33036625
Chin Med Si-Wu-Tang ameliorates fibrotic liver injury via modulating intestinal microbiota and bile acid homeostasis 34736501
Int J Biol Sci Dynamics of the gut-liver axis in rats with varying fibrosis severity Pubmed:35637968
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