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Inhibitory effect of caffeine on 5-azacytidine-induced digital malformations in the rat
Abstract:
The effect of caffeine on 5-azacytidine (5-AC)-induced digital malformations in rat fetuses was investigated. Caffeine suppressed all types of digital defects in the fore- and hindlimbs except for syndactyly induced by 1.0 mg/kg of 5-AC; it was still effective when administered 24 hours after 5-AC treatment. However, fetal mortality increased as the frequency of malformations decreased. While the malformation results support the view that caffeine inhibits the processes leading to malformation expression, the relation between its suppressive effect on malformations and its enhancing effect on fetal mortality is unclear.
Insights
Caffeine reduced 5-azacytidine (5-AC)-induced limb malformations in rat fetuses, even when given later. However, this protective effect on development was linked to increased fetal mortality, with the exact relationship remaining unclear.
Area of Science:
- Developmental toxicology
- Teratology
- Pharmacology
Background:
- 5-azacytidine (5-AC) is a known teratogen that can induce digital malformations in developing fetuses.
- Caffeine is a widely consumed stimulant with potential biological effects on developmental processes.
Purpose of the Study:
- To investigate the effect of caffeine on 5-azacytidine (5-AC)-induced digital malformations in rat fetuses.
- To determine if caffeine administration timing influences its teratogenic effects.
Main Methods:
- Rat fetuses were exposed to 5-azacytidine (5-AC) to induce digital malformations.
- Caffeine was administered at various time points relative to 5-AC exposure.
- The incidence and types of digital malformations, as well as fetal mortality, were assessed.
Main Results:
- Caffeine significantly suppressed most digital defects induced by 5-AC in both forelimbs and hindlimbs.
- Syndactyly, induced by a specific dose of 5-AC, was not suppressed by caffeine.
- Caffeine remained effective in reducing malformations when administered 24 hours after 5-AC treatment.
- A decrease in malformation frequency correlated with an increase in fetal mortality.
Conclusions:
- Caffeine appears to inhibit the developmental processes leading to 5-AC-induced malformations.
- The observed increase in fetal mortality alongside reduced malformations suggests a complex interplay between caffeine's effects.
- Further research is needed to clarify the relationship between caffeine's teratoprotective and embryo-lethal effects.