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In this application note, we describe how you can generate great Single-Cell Western data with an Innoscan 710 scanner, which has the best combination of sensitivity, scan time and resolution needed to scan scWest chips.
Single-cell gene expression studies are revolutionizing our understanding of heterogeneity in disease. Single-cell RNA sequencing tools are powerful for discovering mRNA transcript heterogeneity. However, mRNA levels do not always correlate with functional protein levels. In this application note, learn how Milo was used in parallel with a single-cell RNA-Seq workflow at the Stanford Functional Genomics Facility to validate single-cell RNA expression studies with single-cell protein expression data and ensure accurate and complete conclusions about cellular function. Because it uses the large Western catalog of antibodies & can easily measure intracellular proteins, Milo is the only platform with the versatility to detect diverse targets that are discovered in a sequencing run.
In this application note, we demonstrate several measurements that are difficult or impossible to make with conventional westerns or flow cytometry. We uncover three distinct cell subpopulations that differ based on single- or co-expression of two different protein targets and that could not be distinguished using conventional westerns or flow cytometry. We also demonstrate Milo’s ability to detect discrete cell signaling states by measuring multiple phospho-proteins in individual cells within a population. Finally, we demonstrate how Milo can simultaneously quantify phospho- and total protein expression in each individual cell and quantify how the extent of phosphorylation varies across stimulated and unstimulated cell populations.
The Single-Cell Western™ protocol is highly versatile and can easily be adapted for different biological applications and protein targets. Researchers studying signaling proteins or other targets that require treatment of cells prior to analysis can add a drug, cytokine, or other form of pre-treatment directly to scWest chips after cells have been captured and before running the chip on Milo. Cells can also be treated just prior to settling them onto scWest chips. As a result, the flexible Single-Cell Western workflow allows time-dependent experimental manipulations to be easily performed before lysis and electrophoresis.
Here we describe a two-step, on-chip pre-treatment protocol to measure heterogeneity of modified histones — a class of proteins that is challenging to measure but critical in regulating gene expression. This new measurement capability could be key to unlocking new discoveries in the field of epigenetics.
Every cell is unique, making cell-to-cell heterogeneity important in many areas of biomedicine including cancer pathogenesis, immuno-oncology and regenerative medicine. More and more high-profile publications are using single-cell analysis techniques to reveal variability in cellular response to a drug or stimulus. They're also uncovering variation in drug target expression within a tissue and identifying important subpopulations of cells within complex samples that play key roles in disease progression. Single-cell protein expression information is critical when you need to understand the fundamental composition and behavior of complex biological samples.
Milo, the first and only Single-Cell Western platform out there, lets you do Western blotting at the single-cell level. Now you can run Westerns on thousands of individual cells in parallel and get robust, Western-based information on protein expression heterogeneity in your cells. He also multiplexes so you can measure multiple proteins in each single cell. That means you can get a better understanding of correlations between target expression and characterize cell signaling in specific target-positive subpopulations of cells. Where your target is located in a cell doesn't matter to Milo — his fast, simple workflow lets you measure proteins both on and in each individual cell with the same workflow. It's easy to detect surface proteins and you don't have to worry about fixing and permeabilizing your sample to measure intracellular proteins. As an added bonus, Milo uses conventional Western antibodies which means you can measure diverse protein targets — even ones that don't have good flow cytometry antibodies. The best part? Scout™ Software automates your data analysis and gives you quantitative protein expression measurements in each single cell.
Milo enables scientists to perform single-cell resolution Westerns (scWesterns) for over 1,000 individual cells simultaneously, and in a fraction of the time of conventional Westerns. Researchers can now gain selective protein expression information for up to four protein targets in each cell, offering views into cell-to-cell variation within a complex sample.
Protein analysis plays an important role in stem cell research, and for most researchers, Western blotting is a key component of their toolbox. From verifying pluripotency and identifying lineage-specific cell types to identifying key modulators of cell signaling pathways, to evaluating disease models and therapeutic approaches, the right protein analysis
techniques can help you achieve success. In this eBook, we examine technological advances in Western blotting and protein analysis that are at the forefront of stem cell research. Learn how automated Western systems and Single-Cell Westerns can advance your stem cell research.
In this eBook, we examine technological advances in protein analysis that are at the forefront of immuno-oncology research and therapeutic development.
From Your Peers: Guts and Glory: Dr. Kaelberer Validates a Neuroepithelial Circuit using Milo
“Milo permits study of proteins at the single-cell level to understand the heterogeneity among metastatic cells within a population.”
“I was looking at two different isoforms of a protein, and it was important to know if the cells were expressing just one versus the other or both in a given cell. That was tricky until Milo came. We’re also getting more relevant information because Milo allows us to look at expression of this protein in tissue biopsies.”
Download our Quick Resource Guide to learn how the Three-Plex Antibody Probing Fixture can speed up your antibody validation on Milo. This probing fixture allows you to screen three antibody cocktails simultaneously on a single population of cells by dividing up the gel surface into three distinct regions. If a four-color scanner is available, this allows for screening up to 12 different antibodies on a single scWest chip.
InnoScan 710 Scanner Spec Sheet
InnoScan 1100 Scanner Spec Sheet
This tech note describes how a minor modification in the antibody probing procedure used with a standard antibody probing chamber can improve probing uniformity and reduce technical noise in single-cell western assays.
In this technical note, we demonstrate how diluting antibodies with Milk-Free Antibody Diluent when probing targets with a goat primary antibody delivers improved assay performance on the Milo Single-Cell Western platform.
This technical note will walk you through multiplexing with Milo and provide you with evidence of and guidance for efficient stripping to achieve multiplexing levels that match or exceed those of the most powerful multiplexed flow cytometers.