Mar 19, 2026
Evaluation of the Inflammatory Secretome of Astrocytes Using Cytokine Array
- Elena Coccia1
- 1Icahn School of Medicine at Mount Sinai
Protocol Citation: Elena Coccia 2026. Evaluation of the Inflammatory Secretome of Astrocytes Using Cytokine Array. protocols.io https://dx.doi.org/10.17504/protocols.io.kxygx82eov8j/v1
License: This is an open access protocol distributed under the terms of the Creative Commons Attribution License, which permits unrestricted use, distribution, and reproduction in any medium, provided the original author and source are credited
Protocol status: Working
We use this protocol and it's working
Created: February 12, 2026
Last Modified: March 19, 2026
Protocol Integer ID: 243132
Keywords: astrocytes, cytokine array, inflammatory secretome, Proteome Profiler, cell culture, inflammatory secretome of astrocyte, evaluation of the inflammatory secretome, astrocyte, proteome profiler, human xl cytokine array kit, quantification of cytokine expression level, cytokine expression level, using cytokine array
Abstract
To evaluate the inflammatory secretome of astrocytes by analyzing conditioned media using the Proteome Profiler™ Human XL Cytokine Array Kit, followed by quantification of cytokine expression levels.
Materials
Proteome Profiler™ Human XL Cytokine Array Kit (R&D Systems, #ARY022B)
Chemiluminescent substrate (ECL detection reagent)
PBS (Phosphate Buffered Saline) (1X solution)
Cell culture plates (6-well plates)
Centrifuge tubes (15 mL)
Microcentrifuge tubes (1.5 mL)
Reagents:
Buffer PBS - Used for washing and diluting samples
Enzyme Horseradish Peroxidase (HRP) - Used for detection in the cytokine array
Inhibitor Protease Inhibitor Cocktail - Prevents protein degradation during sample preparation
Troubleshooting
Problem
Low signal intensity in cytokine array
Solution
Ensure proper blocking and incubation times; check reagent expiration dates.
Problem
High background noise
Solution
Verify washing steps are thorough; consider adjusting wash buffer concentrations.
Safety warnings
Handle all reagents and samples according to safety data sheets. Use personal protective equipment (PPE) including gloves and lab coats. Dispose of all biological waste according to institutional guidelines.
Preparation of Conditioned Media
Condition astrocytes in culture for 4 days and collect conditioned media for analysis.
Cell Culture
Culture astrocytes in 6-well plates at a density of 2 × 10^5 cells/well in 2 mL of astrocyte medium. Incubate at 37°C in a 5% CO2 atmosphere for 48 hours until cells reach confluence.
Collection of Conditioned Media
After 48 hours, carefully aspirate the medium and replace it with 2 mL of fresh serum-free medium. Incubate for an additional 4 days. Collect the conditioned media and centrifuge at 1,200 rpm for 5 minutes to remove cell debris.
Cytokine Array Assay
Perform the cytokine array according to the manufacturer's instructions.
Array Setup
Prepare the array membrane by blocking with blocking buffer for 1 hour at room temperature. Dilute conditioned media 1:2 with sample diluent and apply 100 µL to each membrane. Incubate overnight at 4°C.
Detection
Wash membranes three times with wash buffer for 5 minutes each. Add HRP-conjugated detection antibody and incubate for 1 hour at room temperature. Wash membranes again three times with wash buffer for 5 minutes each. Add chemiluminescent substrate and visualize using an imaging system.
Data Analysis
Quantify the integrated optical density of each spot using Fiji software.
Image Processing
Open the acquired images in Fiji software. Use the 'Analyze' function to measure the intensity of each spot. Subtract background intensity and normalize to internal positive control spots.