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Antibody against single-stranded DNA detects both programmed cell death and drug-induced apoptosis
I Naruse1, H Keino, Y Kawarada
1Department of Morphology, Institute for Developmental Research, Aichi Prefectural Colony, Japan.
Abstract:
Cyclophosphamide induced fragmented nuclei in mouse thymic epithelial cells. Agarose gel electrophoresis showed the fragmentation of the DNA extracted from mouse thymus exposed to cyclophosphamide. The cell death induced by cyclophosphamide was considered to be apoptotic. Polyclonal antibody against single-stranded DNA was used immunohistochemically to detect apoptotic cell death in thymic epithelial cells. This antibody also detected programmed cell death in the interdigital necrotic zone of the mouse limb plate on day 14 of gestation, and in the ganglion of the trigeminal nerve on day 13 of gestation. These results show that the antibody specific for single-stranded DNA detected both drug-induced apoptosis and programmed cell death during embryogenesis.
Insights
A novel single-stranded DNA antibody detects drug-induced apoptosis and programmed cell death in mouse thymus and developing embryos. This research highlights the antibody's utility in studying cell death mechanisms.
Area of Science:
- Immunohistochemistry
- Molecular Biology
- Developmental Biology
Background:
- Cyclophosphamide is a known inducer of cell death.
- Apoptosis, or programmed cell death, is a critical biological process.
- Detecting apoptosis requires specific molecular markers.
Purpose of the Study:
- To investigate cyclophosphamide-induced cell death in mouse thymic epithelial cells.
- To evaluate the efficacy of a polyclonal antibody against single-stranded DNA (ssDNA) in detecting apoptosis.
- To assess the antibody's ability to identify programmed cell death during mouse embryogenesis.
Main Methods:
- Induction of apoptosis in mouse thymus using cyclophosphamide.
- Agarose gel electrophoresis to analyze DNA fragmentation.
- Immunohistochemical staining with a polyclonal antibody against ssDNA.
Main Results:
- Cyclophosphamide treatment resulted in fragmented nuclei in thymic epithelial cells.
- DNA extracted from treated thymus showed fragmentation, indicating apoptosis.
- The ssDNA antibody successfully detected apoptotic cell death in thymic cells.
- The antibody also identified programmed cell death in embryonic tissues (limb plate and trigeminal nerve).
Conclusions:
- The ssDNA antibody is a reliable tool for detecting drug-induced apoptosis.
- This antibody can also identify naturally occurring programmed cell death during embryonic development.
- The findings demonstrate the antibody's broad applicability in studying diverse cell death pathways.