Description
Rat GDN (Glia Derived Nexin) ELISA Kit
The Rat GDN (Glia-Derived Nexin) ELISA Kit is specifically designed for the accurate quantification of GDN levels in rat serum, plasma, and cell culture supernatants. This kit offers exceptional sensitivity and specificity, ensuring precise and reproducible results for various research applications.GDN, also known as Protease Nexin-1, is a key protein involved in regulating protease activity and cell migration within the central nervous system. It plays a crucial role in processes such as neuronal development, synaptic plasticity, and neuroinflammation.
Dysregulation of GDN has been implicated in various neurological disorders, making it a valuable biomarker for studying these conditions and developing potential treatments.Overall, the Rat GDN ELISA Kit provides researchers with a reliable tool for investigating the role of GDN in neurobiology and identifying potential therapeutic targets for neurological diseases.
| Assay type: | Sandwich |
| Format: | 96T |
| Assay time: | 4.5h |
| Reactivity: | Rat |
| Detection Method: | Colormetric |
| Detection Range: | 6.25-400 pg/mL |
| Sensitivity: | 3.75 pg/mL |
| Sample Volume Required Per Well: | 100µL |
| Sample Type: | Serum, plasma and other biological fluids |
| Specificity: | This kit recognizes Rat GDN in samples. No significant cross-reactivity or interference between Rat GDN and analogues was observed. |
This ELISA kit uses Sandwich-ELISA as the method. The micro ELISA plate provided in this kit has been pre-coated with an antibody specific to Rat GDN. Standards or samples are added to the appropriate micro ELISA plate wells and combined with the specific antibody. Then a biotinylated detection antibody specific for Rat GDN 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 Rat GDN, biotinylated detection antibody and Avidin-HRP conjugate will appear blue in color. The enzyme-substrate reaction is terminated by adding Stop Solution and the color turns yellow. The optical density (OD) is measured spectrophotometrically at a wavelength of 450 nm ± 2 nm. The OD value is proportional to the concentration of Rat GDN. The concentration of Rat GDN in samples can be calculated by comparing the OD of the samples to the standard curve.
| UniProt Protein Function: | SERPINE2: Serine protease inhibitor with activity toward thrombin, trypsin, and urokinase. Promotes neurite extension by inhibiting thrombin. Binds heparin. Belongs to the serpin family. 3 isoforms of the human protein are produced by alternative splicing. |
| UniProt Protein Details: | Protein type:Secreted; Inhibitor; Secreted, signal peptide Cellular Component: extracellular matrix; extracellular space; extrinsic to external side of plasma membrane; membrane; cell soma; cell; extracellular region; cytosol; neuromuscular junction; vesicle Molecular Function:serine-type endopeptidase inhibitor activity; heparin binding; glycosaminoglycan binding; receptor binding Biological Process: negative regulation of proteolysis; regulation of synaptic transmission, glutamatergic; secretory granule organization and biogenesis; cerebellar granular layer morphogenesis; negative regulation of peptidase activity; negative regulation of blood coagulation; detection of mechanical stimulus involved in sensory perception; mating plug formation; negative regulation of cell proliferation; response to radiation; negative regulation of smoothened signaling pathway; response to wounding; negative regulation of cell growth; blood coagulation; negative regulation of protein catabolic process; regulation of timing of cell differentiation; embryo implantation; negative regulation of phosphoinositide 3-kinase cascade; secretion by cell; positive regulation of astrocyte differentiation |
| NCBI Summary: | displays neurite promoting activity and serine protease inhibitory activity [RGD, Feb 2006] |
| UniProt Code: | P07092 |
| NCBI GenInfo Identifier: | 158138559 |
| NCBI Gene ID: | 29366 |
| NCBI Accession: | NP_062070. 1 |
| UniProt Related Accession: | P07092 |
| Molecular Weight: | 44,063 Da |
| NCBI Full Name: | glia-derived nexin |
| NCBI Synonym Full Names: | serpin peptidase inhibitor, clade E (nexin, plasminogen activator inhibitor type 1), member 2 |
| NCBI Official Symbol: | Serpine2 |
| NCBI Official Synonym Symbols: | PI-7; Pn-1; Spin4; Gdnpn1 |
| NCBI Protein Information: | glia-derived nexin; GDN; serpin E2; protease nexin 1; protease nexin I; protease nexin PN-1; peptidase inhibitor 7; serine protease inhibitor 4; Glia-derived nexin/protease nexin I; plasminogen activator inhibitor type 1; serpin peptidase inhibitor, clade E, member 2; serine (or cysteine) peptidase inhibitor, clade E, member 2; serine (or cysteine) proteinase inhibitor, clade E, member 2 |
| UniProt Protein Name: | Glia-derived nexin |
| UniProt Synonym Protein Names: | Peptidase inhibitor 7; PI-7; Protease nexin 1; PN-1; Protease nexin I; Serpin E2 |
| Protein Family: | Glia-derived nexin |
| UniProt Gene Name: | Serpine2 |
| UniProt Entry Name: | GDN_RAT |
As the OD 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.
| Concentration (pg/mL) | O.D | Average | Corrected |
| 400 | 2.524 2.544 | 2.534 | 2.455 |
| 200 | 1.646 1.694 | 1.67 | 1.591 |
| 100 | 0.907 0.901 | 0.904 | 0.825 |
| 50 | 0.441 0.455 | 0.448 | 0.369 |
| 25 | 0.253 0.235 | 0.244 | 0.165 |
| 12.5 | 0.192 0.17 | 0.181 | 0.102 |
| 6.25 | 0.123 0.139 | 0.131 | 0.052 |
| 0 | 0.079 0.079 | 0.079 | -- |
Precision
Intra-assay Precision (Precision within an assay): 3 samples with low, mid range and high level Rat GDN were tested 20 times on one plate, respectively.
Inter-assay Precision (Precision between assays): 3 samples with low, mid range and high level Rat GDN were tested on 3 different plates, 20 replicates in each plate.
| Intra-assay Precision | Inter-assay Precision | |||||
| Sample | 1 | 2 | 3 | 1 | 2 | 3 |
| n | 20 | 20 | 20 | 20 | 20 | 20 |
| Mean (pg/mL) | 20.52 | 54.62 | 151.10 | 19.24 | 51.86 | 165.87 |
| Standard deviation | 1.11 | 3.01 | 7.71 | 1.29 | 2.51 | 5.18 |
| C V (%) | 5.41 | 5.51 | 5.10 | 6.70 | 4.84 | 3.12 |
Recovery
The recovery of Rat GDN spiked at three different levels in samples throughout the range of the assay was evaluated in various matrices.
| Sample Type | Range (%) | Average Recovery (%) |
| Serum (n=5) | 86-100 | 91 |
| EDTA plasma (n=5) | 85-99 | 91 |
| Cell culture media (n=5) | 94-106 | 99 |
Linearity
Samples were spiked with high concentrations of Rat GDN 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) | ||
| 1:2 | Range (%) | 96-112 | 93-107 | 91-106 |
| Average (%) | 103 | 98 | 97 | |
| 1:4 | Range (%) | 91-103 | 82-95 | 86-96 |
| Average (%) | 97 | 88 | 91 | |
| 1:8 | Range (%) | 91-106 | 80-93 | 86-98 |
| Average (%) | 98 | 86 | 92 | |
| 1:16 | Range (%) | 90-102 | 86-97 | 86-99 |
| Average (%) | 96 | 91 | 93 |
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.
| Item | Specifications | Storage |
| Micro ELISA 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 | 1 vial, 10 mL | 4°C(shading light) |
| Stop Solution | 1 vial, 10 mL | 4°C |
| 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 100µl of standard solutions into the standard wells.
- Add 100µl of Sample / Standard dilution buffer into the control (zero) well.
- Add 100µl 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 100µL 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 350µL 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 100µL 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 90µL of Substrate Reagent to each well. Cover with a new plate seal and incubate forapproximately 15 min at 37°C. Protect the plate from light. Note: the reaction time can beshortened or extended according to the actual color change, but not by more than 30min.
- Add 50 µL of Stop Solution to each well. Note: Adding the stop solution should be done inthe same order as the substrate solution.
- Determine the optical density (OD value) of each well immediately with a microplate readerset at 450 nm.
