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Immunofluorescence Microscopy and mRNA Analysis of Human Embryonic Stem Cells (hESCs) Including Primary Cilia
Maj Linea Vestergaard1, Aashir Awan, Caroline Becker Warzecha
1Laboratory of Reproductive Biology, Section 5712, University Hospital of Copenhagen, Copenhagen OE, Denmark, maj.linea.vestergaard@rh.regionh.dk.
Abstract:
This chapter describes the procedures for immunofluorescence microscopy (IFM) and quantitative PCR (qPCR) analyses of human embryonic stem cells (hESCs) grown specifically under feeder-free conditions. A detailed protocol is provided outlining the steps from initially growing the cells, passaging onto 16-well glass chambers, and continuing with the general IFM and qPCR anlysis. The techniques are illustrated with results on cellular localization of transcriptional factors and components of the Hedgehog, Wnt, PDGF, and TGFβ signaling pathways to primary cilia in stem cell maintenance and differentiation. Furthermore, a sample qPCR experiment is experimentally shown illustrating that these techniques can be important tools in answering basic questions about hESC biology.
Insights
This study details immunofluorescence microscopy and quantitative PCR protocols for feeder-free human embryonic stem cells. These methods analyze signaling pathways and transcriptional factors crucial for stem cell maintenance and differentiation.
Area of Science:
- Stem Cell Biology
- Molecular Biology
- Cellular Imaging
Background:
- Human embryonic stem cells (hESCs) require specific culture conditions for maintenance and differentiation.
- Understanding signaling pathways is crucial for controlling hESC fate.
- Feeder-free culture systems offer advantages for hESC research.
Purpose of the Study:
- To provide detailed protocols for immunofluorescence microscopy (IFM) and quantitative PCR (qPCR) in hESCs.
- To demonstrate the application of IFM and qPCR in analyzing signaling pathways and transcriptional factors.
- To highlight the utility of these techniques in hESC research.
Main Methods:
- Established protocols for culturing hESCs under feeder-free conditions.
- Detailed procedures for IFM to determine cellular localization of proteins.
- Comprehensive qPCR methods for analyzing gene expression.
Main Results:
- IFM successfully localized transcriptional factors and signaling pathway components (Hedgehog, Wnt, PDGF, TGFβ) to primary cilia.
- qPCR experiments demonstrated the ability to assess gene expression related to stem cell biology.
- The combined techniques provide insights into hESC maintenance and differentiation.
Conclusions:
- IFM and qPCR are robust techniques for analyzing hESC biology under feeder-free conditions.
- These methods facilitate the study of key signaling pathways and transcriptional regulation in hESCs.
- The described protocols are valuable tools for basic hESC research and potential therapeutic applications.

