Detection of apoptosis by terminal deoxynucleotidyl transferase-mediated dUTP nick-end labeling and acridine orange in Drosophila embryos and adult male gonads
- PMID: 17487155
- DOI: 10.1038/nprot.2006.235
Detection of apoptosis by terminal deoxynucleotidyl transferase-mediated dUTP nick-end labeling and acridine orange in Drosophila embryos and adult male gonads
Abstract
In Drosophila, vast numbers of cells undergo apoptosis during normal development. In addition, excessive apoptosis can be induced in response to a variety of stress or injury paradigms, including DNA damage, oxidative stress, nutrient deprivation, unfolded proteins and mechanical tissue damage. Two of the most commonly used methods to label apoptotic cells in Drosophila are terminal deoxynucleotidyl transferase-mediated dUTP nick-end labeling (TUNEL) for fixed tissues and acridine orange (AO) staining for live embryos or tissues. Here, we describe protocols for labeling apoptotic cells in Drosophila embryos and adult male gonads. Slightly modified protocols can also be applied for other Drosophila tissues. The AO protocol is quick, simple and allows real-time imaging of doomed cells in live tissues. However, it is difficult to combine with conventional counterstains or Ab labeling. On the other hand, this functionality is readily afforded by the TUNEL protocol, which permits the detection of apoptotic cells in fixed tissues. These staining procedures can be completed in 1-2 d.
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