Related Experiment Videos
Detection of mRNA in flow-sorted cells
Abstract:
Cells were sorted onto nitrocellulose filters which were saturated with a lysing cocktail designed to preferentially immobilize cellular mRNA. After washing, these filters were incubated with 32P-labeled specific DNA probes. We used the phorbol ester/lipopolysaccharide (PMA + LPS) co-induction of IL-1 mRNA and CD13 expression in U937 cells to demonstrate the specificity of the technique. In addition we used the abundant expression of c-fos in U937 to demonstrate linearity. IL-1 beta mRNA is readily discernable autoradiographically from as few as 5,000 PMA + LPS-induced cells sorted onto a filter. With liquid scintillation counting we demonstrate good linearity of the c-fos quantitation over the range of 1,000 cells to 60,000 cells per filter target. The technique is easily adapted to any sorting flow cytometer and should prove useful to help correlate any flow cytometric cell phenotype with specific mRNA abundance.
Insights
This study presents a novel method to detect specific mRNA levels in sorted cells using DNA probes. This technique allows researchers to link cell characteristics with gene expression, advancing cell biology research.
Area of Science:
- Molecular Biology
- Cell Biology
- Immunology
Background:
- Flow cytometry is crucial for cell analysis, but linking cell phenotypes to specific gene expression remains challenging.
- Quantifying mRNA directly within sorted cells requires sensitive and specific techniques.
Purpose of the Study:
- To develop and validate a method for correlating flow cytometric cell phenotypes with specific mRNA abundance.
- To demonstrate the sensitivity and linearity of the developed technique for mRNA detection.
Main Methods:
- Cells were sorted onto nitrocellulose filters and lysed to immobilize cellular mRNA.
- Filters were incubated with 32P-labeled DNA probes for specific mRNA detection.
- The technique was validated using co-induction of Interleukin-1 (IL-1) mRNA and CD13 expression, and abundant c-fos expression in U937 cells.
Main Results:
- The method successfully detected IL-1 beta mRNA from as few as 5,000 induced cells.
- Linearity of c-fos mRNA quantitation was demonstrated over a range of 1,000 to 60,000 cells.
- The technique proved adaptable to standard sorting flow cytometers.
Conclusions:
- This method provides a sensitive and quantitative approach to measure mRNA abundance in sorted cells.
- It enables direct correlation of cellular phenotypes with specific mRNA levels, offering new insights in cell biology.
- The technique is versatile and applicable to various cell types and research questions in immunology and molecular biology.