Neutrophil Elastase Inhibitor Screening Kit
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1 ab Neutrophil Elastase Inhibitor Screening Kit Instructions for Use For the rapid, sensitive and accurate detection of Neutrophil Elastase inhibition in various samples. This product is for research use only and is not intended for diagnostic use.
2 1
3 Table of Contents 1. Overview 3 2. Protocol Summary 4 3. Components and Storage 5 4. Assay Protocol 7 5. Data Analysis 9 5. Troubleshooting 11 2
4 1. Overview Neutrophil Elastase (NE) is an aggressive and cytotoxic 29 kda serine protease stored mainly in the azurophil granules of neutrophil granulocytes. It plays a role in the degradation of a wide range of extracellular matrix proteins, including fibronectin, laminin, proteoglycans, collagens, and elastin. When the extracellular NE concentration exceeds the buffering capacity of endogenous inhibitors, it becomes implicated in the signs, symptoms and disease progression of inflammatory lung disorders via its role in the inflammatory process, mucus overproduction and lung tissue damage. In Abcam s Neutrophil Elastase Inhibitor Screening Kit, NE hydrolyzes a specific fluorescent substrate to release the fluorescent group, which can be detected at Em/Ex = 400/505 nm. In presence of a potent Neutrophil Elastase inhibitor, the hydrolyzation of substrate will be inhibited or stopped. The kit provides a rapid, simple, sensitive, and reliable test suitable as a high throughput screening assay of Neutrophil Elastase inhibitors. For comparison of the relative efficacy of test inhibitors, a control inhibitor, SPCK (K i = 10 µm for human leukocyte elastase) is included. 3
5 2. Protocol Summary Enzyme Preparation Sample Preparation Prepare and Add Reaction Mix Measure Fluorescence 4
6 3. Components and Storage A. Kit Components Item Quantity Assay Buffer Substrate Neutrophil Elastase (Lyophilized) 25 ml 0.2 ml 1 vial Inhibitor Control (3 mm SPCK) 20 µl * Store kit at -20 C, protect from light. Warm the assay buffer to room temperature before use. Briefly centrifuge vials before opening. Read the entire protocol before performing the assay. NEUTROPHIL ELASTASE: Reconstitute the Neutrophil Elastase with 220 µl Assay Buffer. Aliquot and store the NE stock solution at -80 C. Avoid repeated freeze/thaw cycles. Use within one week. 5
7 B. Additional Materials Required Microcentrifuge Pipettes and pipette tips Fluorescent microplate reader 96-well plate Orbital shaker 6
8 4. Assay Protocol 1. Enzyme Preparation: For each well, prepare a total 50 µl Neutrophil Elastase solution comprised of: Assay Buffer 48 µl NE stock solution 2 µl 2. Sample Preparation: Dissolve candidate compounds into a proper solvent. Dilute to 4X the final desired test concentration with Assay Buffer. For Inhibitor Control, dilute Inhibitor Control Stock 1:25 with Assay Buffer. Add 25 µl diluted test compounds, Inhibitor Control or Assay Buffer into NE Enzyme wells as sample screen, Inhibitor Control, or Enzyme Control. Mix well and incubate for 5 min at 37 C. 3. Reaction Mix: Mix enough reagents for the number of assays to be performed. For each well, prepare a total 25 µl Reaction Mix: Assay Buffer 23 µl Substrate 2 µl Add 25 µl of the Reaction Mix into each reaction well, mix, measure immediately. 7
9 4. Measurement: Read Ex/Em = 400/505 nm R 1 at T 1. Read R 2 again at T 2 after incubating the reaction at 37 C for 30 min, protected from light. The RFU of fluorescence generated by hydrolyzation of substrate is: RFU = R 2 R 1 Note: It is recommended to read kinetically to choose the R 1 and R 2 within the linear range. 8
10 5. Data Analysis Set the RFU of Enzyme Control as the 100 % Relative Activity Value and calculate the relative activity for each candidate inhibitor as follows: % Relative Activity = RFU of Candidate RFU of Enzyme Control x 100% 9
11 SPCK Inhibits NE Activity at Different Concentrations 10
12 6. Troubleshooting Problem Reason Solution Assay not working Unexpected results Assay buffer at wrong temperature Protocol step missed Plate read at incorrect wavelength Unsuitable microtiter plate for assay Measured at wrong wavelength Samples contain impeding substances Unsuitable sample type Sample readings are outside linear range Assay buffer must not be chilled - needs to be at RT Re-read and follow the protocol exactly Ensure you are using appropriate reader and filter settings (refer to datasheet) Fluorescence: Black plates (clear bottoms) Luminescence: White plates Colorimetry: Clear plates If critical, datasheet will indicate whether to use flat- or U-shaped wells Use appropriate reader and filter settings described in datasheet Troubleshoot and also consider deproteinizing samples Use recommended samples types as listed on the datasheet Concentrate/dilute samples to be in linear range 11
13 Samples with inconsistent readings Lower/ Higher readings in samples and standards Unsuitable sample type Samples prepared in the wrong buffer Samples not deproteinized (if indicated on datasheet) Cell/tissue samples not sufficiently homogenized Too many freezethaw cycles Samples contain impeding substances Samples are too old or incorrectly stored Not fully thawed kit components Out-of-date kit or incorrectly stored reagents Reagents sitting for extended periods on ice Incorrect incubation time/temperature Incorrect amounts used Refer to datasheet for details about incompatible samples Use the assay buffer provided (or refer to datasheet for instructions) Use the 10kDa spin column (ab93349) Increase sonication time/ number of strokes with the Dounce homogenizer Aliquot samples to reduce the number of freeze-thaw cycles Troubleshoot and also consider deproteinizing samples Use freshly made samples and store at recommended temperature until use Wait for components to thaw completely and gently mix prior use Always check expiry date and store kit components as recommended on the datasheet Try to prepare a fresh reaction mix prior to each use Refer to datasheet for recommended incubation time and/or temperature Check pipette is calibrated correctly (always use smallest volume pipette that can pipette entire volume) 12
14 Problem Reason Solution Standard curve is not linear Not fully thawed kit components Pipetting errors when setting up the standard curve Incorrect pipetting when preparing the reaction mix Air bubbles in wells Concentration of standard stock incorrect Errors in standard curve calculations Use of other reagents than those provided with the kit Wait for components to thaw completely and gently mix prior use Try not to pipette too small volumes Always prepare a master mix Air bubbles will interfere with readings; try to avoid producing air bubbles and always remove bubbles prior to reading plates Recheck datasheet for recommended concentrations of standard stocks Refer to datasheet and re-check the calculations Use fresh components from the same kit For further technical questions please do not hesitate to contact us by (technical@abcam.com) or phone (select contact us on for the phone number for your region). 13
15 14
16 UK, EU and ROW Tel: +44 (0) US, Canada and Latin America Tel: ABCAM (22226) China and Asia Pacific Tel: ( 中國聯通 ) Japan technical@abcam.co.jp Tel: +81-(0) Copyright 2012 Abcam, All Rights Reserved. The Abcam logo is a registered trademark. All information / detail is correct at time of going to print. 15
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