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Cell death in the early adriamycin rat model
J Gillick1, S Giles, J Bannigan
1The Children's Research Centre, Our Lady's Hospital for Sick Children, Dublin, University College Dublin, Ireland.
Pediatric Surgery International
|December 10, 2002
Summary
Adriamycin exposure in pregnant rats causes VACTERL association-like birth defects, but not through increased embryonic cell death. This study found no evidence of apoptosis, suggesting alternative mechanisms for adriamycin
Area of Science:
- Developmental Biology
- Toxicology
- Teratology
Background:
- The Adriamycin Rat Model (ARM) mimics human VACTERL association, a complex congenital disorder.
- Adriamycin, a chemotherapy drug, is suspected to cause developmental abnormalities via embryonic cytotoxicity.
- Lysotracker red (LT) is a tool for visualizing apoptosis in rodent embryos.
Purpose of the Study:
- To investigate the hypothesis that adriamycin exposure increases embryonic cell death.
- To determine if apoptosis is the mechanism underlying adriamycin-induced teratogenicity in the ARM.
Main Methods:
- Pregnant rats received adriamycin (1.75 mg/kg) or saline on days 7-9 of gestation.
- Embryos were collected at various time points (3h to 21 days) for morphological analysis.
- Lysotracker red staining and confocal microscopy were used to assess apoptosis in early embryos.
Main Results:
- All term offspring from adriamycin-treated rats exhibited typical ARM malformations.
- No increase in apoptosis or cellular debris was observed in adriamycin-exposed embryos at 3h and 24h post-dose.
- Embryonic notochordal distortion and gut abnormalities were noted by day 10.5, but without evidence of cell death.
Conclusions:
- The teratogenic effects of adriamycin in the ARM are not mediated by increased embryonic apoptosis.
- Alternative mechanisms of adriamycin-induced developmental toxicity should be explored.
- This study refutes the cell death hypothesis for adriamycin teratogenicity in this model.