Description
Human ProGRP ELISA Kit
Human ProGRP ELISA kits are used to detect Pro-Gastrin Releasing Peptide (ProGRP) in serum, plasma, tissue homogenates, cell lysates, cell culture supernatants and other biological samples. ProGRP is the precursor of gastrin-releasing peptide (GRP), a bombesin-like neuropeptide that is made as a longer prohormone and cleaved into the active 27-residue peptide and a carboxy-terminal extension. GRP is expressed in neurons of the central nervous system, in neuroendocrine cells of the lung and in the gastrointestinal tract, where it stimulates gastrin release and gut motility, and it acts on pulmonary neuroendocrine cells and in itch signalling. Unlike mature GRP, which is rapidly degraded, the larger precursor fragment is stable in blood. ProGRP concentrations may be elevated in small cell lung cancer and other neuroendocrine tumours, and it has been investigated as a marker for diagnosis, prognosis and monitoring of treatment response.
| Product Name: | Human ProGRP (Pro-Gastrin Releasing Peptide) ELISA Kit |
| SKU: | AEKE00325 |
| Size: | 96 Assays |
| Reactivity: | Human |
| Synonyms: | pro-GRP, preproGRP, pre-proGRP |
| Assay Type: | Competitive Inhibition |
| Sensitivity: | 4.95 pg/mL |
| Range: | 15.63-1000 pg/mL |
| Standard: | 1000 pg/mL |
| Assay Length: | 2h |
| Sample Type: | Serum, Plasma, Tissue Homogenates, Cell Lysates, Cell Culture Supernates and Other Biological Fluids |
| Kit Components: |
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This assay employs the competitive inhibition enzyme immunoassay technique. The microtiter plate provided in this kit has been pre-coated with Human ProGRP protein. Standards or samples are added to the appropriate microtiter plate wells then with a biotin-conjugated antibody specific to Human ProGRP. Next, Avidin conjugated to Horseradish Peroxidase (HRP) is added to each microplate well and incubated. After TMB substrate solution is added. The enzyme-substrate reaction is terminated by the addition of sulphuric acid solution and the color change is measured spectrophotometrically at a wavelength of 450nm ± 10nm. The concentration of Human ProGRP in the samples is then determined by comparing the OD of the samples to the standard curve.
| Standard Curve: |
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| Precision: | Intra-assay Precision (Precision within an assay)：CV%<8% Three samples of known concentration were tested twenty times on one plate to assess intra-assay precision. Inter-assay Precision (Precision between assays)：CV%<10% Three samples of known concentration were tested in forty separate assays to assess inter-assay precision. |
*Note:The below protocol is a sample protocol. Protocols are specific to each batch/lot. For the correct instructions please follow the protocol included in your kit.
| Step | Protocol |
| 1. | After the kit is equilibrated at room temperature, add 50 μL of Standard Working Solution (gradually dilution refers to Reagent Preparation) or 50 μL of sample to each well, immediately add 50 μL of 1× Biotinylated-Conjugate Working Solution to each well, mix well, incubate at 37°C for 60 minutes. |
| 2. | Discard the liquid in the plate, add 200 μL 1× Wash Buffer to each well, and wash the plate 3 times. After pat it dry against clean absorbent paper, add 100 μL 1× Streptavidin-HRP Working Solution to each well, incubate at 37°C for 60 minutes. |
| 3. | Discard the liquid in the plate, add 200 μL 1× Wash Buffer to each well, and wash the plate 5 times. After pat it dry against clean absorbent paper, add 90 μL TMB Substrate Solution to each well, incubate at 37°C for 20 minutes in the dark . |
| 4. | Add 50 μL Stop Reagent to each well, shake plate on a plate shaker for 1 minute to mix. Record the OD at 450 nm immediately, calculation of the results. |
When carrying out an ELISA assay it is important to prepare your samples in order to achieve the best possible results. Below we have a list of procedures for the preparation of samples for different sample types.
| Sample Type | Protocol |
| Serum | Samples should be collected into a serum separator tube. After clotting for 2 hours at room temperature or overnight at 4°C, and then centrifuging at 1000 × g for 20 minutes. Assay freshly prepared serum immediately or store samples in aliquot at -20°C or -80°C for later use. Avoid repeated freeze-thaw cycles. |
| Plasma | Collect plasma using EDTA or heparin as an anticoagulant. Centrifuge samples at 1000 × g and 2-8°C for 15 minutes within 30 minutes of collection. Remove plasma and assay immediately or store samples in aliquot at -20°C or -80°C for later use. Avoid repeated freeze-thaw cycles. |
| Tissue homogenates | 1. Rinse the tissues in pre-cooled PBS to completely remove excess blood, and weigh them before homogenization. 2. Mince the tissues and homogenize in fresh lysis buffer (PBS for most tissues). Use a glass homogenizer on ice. 3. Ultrasound the suspension until the solution is clear. 4. Centrifuge for 5 minutes at 10000 × g, collect the supernatant and assay immediately or store at ≤ -20°C. |
| Cell lysates | 1. Wash adherent cells with PBS, detach with trypsin, and centrifuge at 1000 × g for 5 minutes. 2. Wash cells 3 times in PBS. 3. Resuspend cells in fresh lysis buffer at 10⁷ cells/mL. Ultrasound if necessary. 4. Centrifuge at 1500 × g for 10 minutes at 2-8°C to remove debris. Assay immediately or store at ≤ -20°C. |
| Urine | Collect mid-stream first urine of the day directly into a sterile container. Centrifuge to remove particulate matter. Assay immediately or aliquot and store at ≤ -20°C. Avoid repeated freeze-thaw cycles. |
| Saliva | Collect saliva using a collection device. Centrifuge at 1000 × g for 15 minutes at 2-8°C. Remove particulates and assay immediately or aliquot and store at ≤ -20°C. Avoid repeated freeze-thaw cycles. |
| Feces | Dry feces weighing more than 50 mg were collected. Wash with PBS (w:v = 1:9). Sonicate and centrifuge at 5000 × g for 10 minutes. Collect the supernatant and assay immediately. |
| CSF (Cerebrospinal fluid) | Remove particulates by centrifugation. Assay immediately or aliquot and store at ≤ -20°C. Avoid repeated freeze-thaw cycles. |
| Cell culture supernatant | Centrifuge samples at 1000 × g for 20 minutes. Collect the supernatant and assay immediately or store at -20°C or -80°C. Avoid repeated freeze-thaw cycles. |
| Uniprot ID: | P07492 |
| Research Area: | Tumor Immunity, Endocrinology, Reproductive Science, Pulmonology, Hepatology, Gastroenterology, Hormone Metabolism |
