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Taurocholate induces changes in rat cardiomyocyte contraction and calcium dynamics
Julia Gorelik1, Sian E Harding, Andrew I Shevchuk
1Division of Medicine, Imperial College School of Medicine, MRC Clinical Sciences Centre, Hammersmith Campus, Du Cane Road, London W12 0NN, U.K.
Clinical Science (London, England : 1979)
|August 1, 2002
Summary
The bile acid taurocholate disrupts heart cell function, causing arrhythmias and reduced contractions. This research links obstetric cholestasis to potential cardiac-related intrauterine death.
Area of Science:
- Cardiology
- Biochemistry
- Cell Biology
Background:
- Obstetric cholestasis is linked to elevated bile acids and intrauterine death.
- Previous studies showed taurocholate impairs rat cardiomyocyte function.
Purpose of the Study:
- To further investigate the effects of taurocholate on cardiomyocytes.
- To explore the mechanisms behind taurocholate-induced cardiac dysfunction.
Main Methods:
- Cultured neonatal and adult rat cardiomyocytes were exposed to varying concentrations of taurocholate.
- Scanning ion-conductance microscopy was used to assess contraction amplitude and calcium transients.
Main Results:
- Taurocholate reduced contraction rate, proportion of beating cells, and contraction amplitude in a dose-dependent manner.
- Calcium transients were altered, indicating impaired calcium release from the sarcoplasmic reticulum.
- Neonatal cardiomyocytes showed irreversible effects at higher concentrations, while adult cells showed reversible changes.
Conclusions:
- Taurocholate induces various dysrhythmias in individual cardiomyocytes.
- These findings support the hypothesis that obstetric cholestasis may contribute to sudden intrauterine death via cardiac mechanisms.