Gap junction alterations in human cardiac disease

NJ Severs, SR Coppen, E Dupont, HI Yeh… - Cardiovascular …, 2004 - academic.oup.com
NJ Severs, SR Coppen, E Dupont, HI Yeh, YS Ko, T Matsushita
Cardiovascular research, 2004academic.oup.com
Gap junctions, assembled from connexins, form the cell-to-cell pathways for propagation of
the precisely orchestrated patterns of current flow that govern the regular rhythm of the
healthy heart. As in most tissues and organs, multiple connexin types are expressed in the
heart; connexin43, connexin40 and connexin45 are found in distinctive combinations and
relative quantities in different, functionally specialized subsets of cardiomyocyte. Alterations
of gap junction organization and connexin expression are now well established as a …
Abstract
Gap junctions, assembled from connexins, form the cell-to-cell pathways for propagation of the precisely orchestrated patterns of current flow that govern the regular rhythm of the healthy heart. As in most tissues and organs, multiple connexin types are expressed in the heart; connexin43, connexin40 and connexin45 are found in distinctive combinations and relative quantities in different, functionally specialized subsets of cardiomyocyte. Alterations of gap junction organization and connexin expression are now well established as a consistent feature of human heart disease in which there is an arrhythmic tendency. These alterations may take the form of structural remodelling, involving disturbances in the distribution of gap junctions and/or alteration of the amount or type of connexin(s) expressed. In the diseased ventricles, the most consistent quantitative alteration involves heterogeneous reduction in connexin43 expression. In the atria, features of gap organization and connexin expression have been implicated in the initiation of atrial fibrillation and, once the condition becomes chronic, gap junction alterations associated with remodelling may contribute to persistence of the condition. By correlating data from studies on the human patient with those from animal and cell models, alterations in gap junctions and connexins have emerged as important factors to be considered in understanding the pro-arrhythmic substrate found in a variety of forms of heart disease.
Oxford University Press