Key result
UT-B deletion in mice caused dynamic expression regulation of TNNT2 at an early stage and ANP at a late stage, providing clues to molecular events in cardiac conduction defects.
Why the study?
Does UT-B deletion alter protein expression in the heart of mice with cardiac conduction defects?
Does UT-B deletion alter protein expression in the heart of mice with cardiac conduction defects?
UT-B deletion in mice causes dynamic expression regulation of TNNT2 and ANP, providing potential molecular clues for cardiac conduction defects.
Answers are grounded in this paper and cite their sources.
May inform preclinical mechanisms of conduction defects; leaves open human translation and therapeutic relevance.
Cardiac conduction defects were found in transgenic mice deficient in urea transporter UT-B. To investigate the molecular mechanisms of the conduction defects caused by UT-B deletion, we studied the protein expression profiles of heart tissue (comprising most conduction system) in wild-type versus UT-B null mice at different ages. By two-dimensional electrophoresis-based comparative analysis, we found that more than dozen proteins were modulated (>two-fold) in the myocardium of UT-B null mice. Out of these modulated proteins, troponin T (TNNT2) presented significant changes in UT-B null mice at early stage prior to the development of P-R interval elongation, while the change of atrial natriuretic peptide (ANP) occurred only at late stage in UT-B null mice that had the AV block. These data indicate that UT-B deletion caused the dynamic expression regulation of TNNT2 and ANP, and these proteins may provide new clues to investigate the molecular events involved in cardiac conduction.
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Yu et al. (2009) studied Cardiac conduction defects. UT-B deletion vs. Wild-type mice was evaluated on Protein expression profiles of heart tissue. UT-B deletion in mice caused dynamic expression regulation of TNNT2 at an early stage and ANP at a late stage, providing clues to molecular events in cardiac conduction defects.
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