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Detection of mRNAs in Peyer's patches of the developing mouse embryo
T Kikuchi1, S Mori, S I Nishikawa
1Department of Molecular Genetics, Kyoto University Graduate School of Medicine, Sakyo-ku, Kyoto, Japan.
Abstract:
We describe a method to identify cells expressing mRNA of interest in the developing digestive tract by whole mount in situ hybridization with digoxigenin-labeled RNA probes. In preparing samples, serosal tissue surrounding the intestine was removed. Enzymatic reactions and probe concentrations were optimized. Furthermore, polyvinyl alcohol was included in the reaction mixture for the color development of alkaline phosphatase conjugated to the antibody against digoxigenin. These modifications improved the sensitivity and enabled us to identity cells that express mRNA in embryonic intestine. Using the antisense probe for VCAM-1, the protein product of which is an immunohistochemical marker of the Peyer's patch in the embryonic intestine, cells expressing mRNA were identified as spot-like clusters in Peyer's patches, confirming the validity of the method. With this method, mRNAs of both lymphotoxins alpha and beta, key molecules for peripheral lymphoid organ development, were found to be confined to the Peyer's patch in the developing intestine. Whole mount in situ hybridization analysis is a useful tool for exploring spatio-temporal expression profiles of mRNA in the developing immune organs.
Insights
This study presents an optimized whole mount in situ hybridization method to detect mRNA in embryonic intestines. The technique successfully identified mRNA expression in Peyer
Area of Science:
- Developmental Biology
- Immunology
- Molecular Biology
Background:
- Identifying specific mRNA expression in developing organs is crucial for understanding tissue formation and function.
- Existing methods may lack the sensitivity or specificity required for detailed analysis of embryonic tissues like the digestive tract.
Purpose of the Study:
- To develop and optimize a whole mount in situ hybridization technique for sensitive mRNA detection in the embryonic digestive tract.
- To validate the method's efficacy by identifying known markers and exploring the expression of key immune molecules.
Main Methods:
- Whole mount in situ hybridization using digoxigenin-labeled RNA probes on embryonic intestine samples.
- Optimization of enzymatic reactions, probe concentrations, and inclusion of polyvinyl alcohol for enhanced color development.
- Removal of surrounding serosal tissue to improve accessibility and signal clarity.
Main Results:
- The optimized method demonstrated improved sensitivity for detecting mRNA in embryonic intestinal cells.
- VCAM-1 mRNA, a marker for Peyer's patches, was successfully localized to spot-like clusters, validating the technique.
- Lymphotoxins alpha and beta mRNA, critical for lymphoid organ development, were found specifically within the Peyer's patch.
Conclusions:
- The refined whole mount in situ hybridization technique is effective for identifying mRNA expression patterns in the developing embryonic intestine.
- This method provides a valuable tool for investigating the spatio-temporal expression of genes involved in immune organ development.
- The findings highlight the utility of this approach for advancing research in developmental immunology and molecular biology.