Key result
TBQ exerts negative inotropic effects consistent with inhibition of the SR Ca2+ pump, with differential effects on relaxation depending on pacing frequency in rabbit versus rat ventricles.
Why the study?
Does TBQ affect mechanical relaxation and contraction-relaxation coupling in isolated rabbit and rat ventricles?
Does TBQ affect mechanical relaxation and contraction-relaxation coupling in isolated rabbit and rat ventricles?
TBQ inhibits the SR Ca2+ pump, producing negative inotropic effects and species-specific differential effects on relaxation during the staircase phenomenon in rabbit versus rat ventricles.
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Hypothesis-generating in isolated animal ventricles; leaves open translation to human cardiac calcium handling and any therapeutic relevance.
Baudet et al. (1996) studied this question. 2,5 di-(tert-butyl)-1,4-benzohydroquinone (TBQ) vs. control conditions was evaluated on mechanical relaxation and contraction-relaxation coupling. TBQ exerts negative inotropic effects consistent with inhibition of the SR Ca2+ pump, with differential effects on relaxation depending on pacing frequency in rabbit versus rat ventricles.
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