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Retinoic acid receptor gamma: specific immunodetection and phosphorylation
C Rochette-Egly1, Y Lutz, M Saunders
1Laboratoire de Génétique Moléculaire des Eucaryotes du Centre National pour la Recherche Scientifique, l'Institut National de la Santé et de la Recherche Medicale, Faculté de Médecine, Strasbourg, France.
The Journal of Cell Biology
|October 1, 1991
Summary
Researchers developed specific antibodies to detect retinoic acid receptor gamma 1 (RAR-gamma 1) and its isoforms in mouse and human cells. These antibodies enabled the detection and characterization of RAR-gamma 1 phosphorylation in mouse embryos.
Area of Science:
- Molecular Biology
- Developmental Biology
- Immunology
Background:
- Retinoic acid receptors (RARs) are crucial nuclear receptors regulating gene expression.
- RAR-gamma 1 plays a significant role in embryonic development and cellular differentiation.
- Specific antibodies are needed to study RAR-gamma 1 protein expression and function.
Purpose of the Study:
- To generate and characterize specific antibodies against human and mouse RAR-gamma 1.
- To utilize these antibodies for detecting RAR-gamma 1 isoforms and their post-translational modifications.
- To investigate the presence and phosphorylation of RAR-gamma 1 in mouse embryonic tissues.
Main Methods:
- Generation of synthetic peptides unique to RAR-gamma 1 sequences.
- Production of monoclonal and polyclonal antibodies against these peptides.
- Immunoprecipitation and Western blotting to confirm antibody specificity.
- Gel retardation/shift assays to assess DNA-binding complex interactions.
- Analysis of nuclear extracts from mouse embryos and F9 embryonal carcinoma cells.
Main Results:
- Four monoclonal antibodies (mAbs) and one rabbit polyclonal antibody (RP) were selected, showing specific reactivity to RAR-gamma 1.
- Antibodies recognized both human and mouse RAR-gamma 1, with some exhibiting species- or isoform-specificity.
- Antibodies against D2 and F regions also recognized the RAR-gamma 2 isoform.
- The characterized antibodies detected mRAR-gamma 1 and gamma 2 isoforms in mouse embryonic tissues.
- Demonstrated phosphorylation of mRAR-gamma 1, primarily in the NH2-terminal A/B region.
Conclusions:
- Novel antibodies against RAR-gamma 1 have been successfully generated and validated.
- These antibodies are valuable tools for studying RAR-gamma 1 expression, isoforms, and function in developmental contexts.
- The findings provide insights into the phosphorylation status of mRAR-gamma 1 in early mouse development.