Abstract
Tritiated thymidine ([3H]dT ) and its analogs bromodeoxyuridine (BrdU ), iododeoxyuridine (IdU ), chlorodeoxyuridine (CldU ), and ethynyl deoxyuridine (EdU ) are used extensively to study neuronal time of origin and pattern of migration . Here, we discuss the advantages and pitfalls of identifying dividing cells with these markers and emphasize that they simply indicate DNA synthesis . Thus, in addition to dividing cells, they can label cells that are undergoing DNA repair and/or cell death . As foreign molecules in the DNA, these markers can affect the kinetics of cell proliferation and also have unpredictable functional consequences. We review general protocols and present evidence, based on our own studies in nonhuman primates , that cell proliferation , as indicated by cell numbers and/or their survival , as well as the localization of migrating cells, may be affected by the labeling method itself. We show that measurements made using [3H]dT labeling are more accurate than those using BrdU, perhaps because [3H]dT is less toxic . Thus, utmost caution should be exercised when interpreting the results obtained by using thymidine analogs as possible indicators of the number of mitotic divisions , patterns of migration, final positions , and ultimate fate of cells.
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Acknowledgments
We thank Drs. Albert Ayoub and Brian Rash for providing images and for useful discussion on the protocols used in their research. We also thank Ms. Mariamma Pappy for useful discussion. This work was supported by a grant from NIH NINDS.
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Duque, A., Rakic, P. (2015). Identification of Proliferating and Migrating Cells by BrdU and Other Thymidine Analogs: Benefits and Limitations. In: Merighi, A., Lossi, L. (eds) Immunocytochemistry and Related Techniques. Neuromethods, vol 101. Humana Press, New York, NY. https://doi.org/10.1007/978-1-4939-2313-7_7
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DOI: https://doi.org/10.1007/978-1-4939-2313-7_7
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