Related Experiment Video
Updated: Jun 20, 2026
Highly Sensitive and Quantitative Detection of Proteins and Their Isoforms by Capillary Isoelectric Focusing Method
Published on: September 19, 2018
Simultaneous detection of ERK-, p38-, and JNK-MAPK phosphorylation in human adipose-derived stem cells using the
Ralf Schubert1, Helmut Geiger, Stefan Zielen
1Department of Pediatrics, Goethe University, Theodor Stern Kai 7, 60590 Frankfurt/M., Germany.
Abstract:
Despite expanded research in stem cell biology, little is known about the mechanisms underlying migration, growth, and differentiation of adipose-derived adult mesenchymal stem cells (ASC). The simultaneous measurement of intracellular pathways opens new avenues to gain further insights in these processes. We used the Cytometric Bead Array (CBA) Flex Set technology to simultaneously analyze protein phosphorylation after stimulation of ASC and compared the results with data generated by corresponding Western blots. Signal transduction of ASC was stimulated by epidermal growth factor (EGF) and analyzed by determining phosphorylation of mitogen-activated protein kinases (MAPKs) ERK, p38, and JNK by Western blotting and CBA. After incubation with EGF, all MAPKs were significantly but differentially phosphorylated depending on time and dose. Furthermore, the ERK-response was abolished by EGF-R antagonist AG 1478 and kinase inhibitor PD98059, whereas p38 and JNK were only inhibited by AG1478. The stimulation and inhibition profiles between the two assays were highly comparable and the data were significantly correlated. In the present study we demonstrated that the CBA technology offers a reliable and convenient method for multiplexing of phospho-proteins in the evaluation of signal transduction pathways of adipose-derived mesenchymal stem cells.
Insights
Cytometric Bead Array (CBA) technology reliably measures protein phosphorylation in adipose-derived stem cells (ASCs). This method offers a convenient way to study signal transduction pathways, aiding research into ASC migration, growth, and differentiation.
Area of Science:
- Stem cell biology
- Molecular signaling
- Biotechnology
Background:
- Adipose-derived stem cells (ASCs) are crucial for regenerative medicine.
- Mechanisms of ASC migration, growth, and differentiation remain incompletely understood.
- Simultaneous analysis of intracellular pathways is needed to elucidate these processes.
Purpose of the Study:
- To evaluate the Cytometric Bead Array (CBA) Flex Set technology for analyzing protein phosphorylation in ASCs.
- To compare CBA results with Western blot data for signal transduction pathway analysis.
- To investigate the signal transduction pathways in ASCs stimulated by epidermal growth factor (EGF).
Main Methods:
- ASCs were stimulated with EGF.
- Protein phosphorylation of mitogen-activated protein kinases (MAPKs) ERK, p38, and JNK was measured.
- Simultaneous analysis was performed using CBA Flex Set technology and Western blotting.
- Inhibition studies used EGF-R antagonist AG 1478 and kinase inhibitor PD98059.
Main Results:
- EGF stimulation resulted in significant, time- and dose-dependent phosphorylation of all MAPKs.
- ERK phosphorylation was inhibited by AG 1478 and PD98059.
- p38 and JNK phosphorylation were inhibited only by AG 1478.
- CBA and Western blot assays showed comparable stimulation and inhibition profiles with significant data correlation.
Conclusions:
- CBA technology is a reliable and convenient method for multiplex protein phosphorylation analysis in ASCs.
- This multiplexing approach aids in evaluating signal transduction pathways in ASCs.
- The findings support the use of CBA for advancing stem cell research.
