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- W2040489706 abstract "Connexin (Cx)40 and Cx45 are the major protein subunits of gap junction channels in the conduction system of mammals. To determine the role of Cx40, we correlated cardiac activation with Connexin distribution in normal and Cx40-deficient mice hearts.Epicardial and septal activation was recorded in Langendorff-perfused adult mice hearts with a 247-point compound electrode (interelectrode distance, 0.3 mm). After electrophysiological measurements, hearts were prepared for immunohistochemistry and histology to determine Connexin distribution and fibrosis. In both wild-type and Cx40-deficient animals, epicardial activation patterns were similar. The right and left ventricular septum was invariably activated from base to apex. Histology revealed a continuity of myocytes from the common bundle to the septal myocardium. Within this continuity, colocalization was found of Cx43 and Cx45 but not of Cx40 and Cx43. Both animals showed similar His-bundle activation. In Cx40-deficient mice, the proximal bundle branches expressed Cx45 only. The absence of Cx40 in the proximal bundles correlated with right bundle-branch block. Conduction in the left bundle branch was impaired as compared with wild-type animals.Our data show that (1) in mice, a continuity exists between the common bundle and the septum, and (2) Cx40 deficiency results in right bundle-branch block and impaired left bundle-branch conduction." @default.
- W2040489706 created "2016-06-24" @default.
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- W2040489706 date "2001-03-20" @default.
- W2040489706 modified "2023-10-06" @default.
- W2040489706 title "Impaired Conduction in the Bundle Branches of Mouse Hearts Lacking the Gap Junction Protein Connexin40" @default.
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- W2040489706 doi "https://doi.org/10.1161/01.cir.103.11.1591" @default.
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