© 1997 American Heart Association, Inc.
Articles |
Expression Pattern of Connexin Gene Products at the Early Developmental Stages of the Mouse Cardiovascular System
From the Laboratoire de Génétique et Physiologie du Développement (B.D., T.J-G., D.G., M.T-R.), UMR C9943, Institut de Biologie du Développement de Marseille (France), Faculté des Sciences de Luminyce; GSF Forschungszentrum (E.D.), Institute for Mammalian Genetics, Oberschleisshem, Germany; Abt. Molekulargenetik (K.W.), Institut für Genetik, Universität Bonn (Germany); and Laboratoire d'Immunochimie des Peptides et Virus (J.-P.B.), UPR 9021, Strasbourg, France.
Correspondence to Dr Magali Théveniau-Ruissy, LGPD-IBDM, Campus de Luminy, Case 907, 13288 Marseille Cédex 09, France. E-mail thevenia{at}lgpd.univ-mrs.fr
Abstract The synchronized contraction of myocytes in cardiac muscle requires the structural and functional integrity of the gap junctions present between these cells. Gap junctions are clusters of intercellular channels formed by transmembrane proteins of the connexin (Cx) family. Products of several Cx genes have been identified in the mammalian heart (eg, Cx45, Cx43, Cx40, and Cx37), and their expression was shown to be regulated during the development of the myocardium. Cx43, Cx40, and Cx45 are components of myocyte gap junctions, and it has also been demonstrated that Cx40 was expressed in the endothelial cells of the blood vessels. The aim of the present work was to investigate the expression and regulation of Cx40, Cx43, and Cx37 during the early stages of mouse heart maturation, between 8.5 days post coitum (dpc), when the first rhythmic contractions appear, and 14.5 dpc, when the four-chambered heart is almost completed. At 8.5 dpc, only the reverse-transcriptase polymerase chain reaction technique has allowed identification of Cx43, Cx40, and Cx37 gene transcripts in mouse heart, suggesting a very low activity level of these genes. From 9.5 dpc, all three transcripts became detectable in whole-mount in situ–hybridized embryos, and the most obvious result was the labeling of the vascular system with Cx40 and Cx37 anti-sense riboprobes. Cx40 and Cx37 gene products (transcript and/or protein) were demonstrated to be expressed in the vascular endothelial cells at all stages examined. By contrast, only Cx37 gene products were found in the endothelial cells of the endocardium. In heart, Cx37 was expressed exclusively in these cells, which rules out any direct involvement of this Cx in the propagation of electrical activity between myocytes and the synchronization of contractions. Between 9.5 and 11.5 dpc, Cx40 gene activation in myocytes was demonstrated to proceed according to a caudorostral gradient involving first the primitive atrium and the common ventricular chamber (9.5 dpc) and then the right ventricle (11.5 dpc). During this period of heart morphogenesis, there is clearly a temporary and asymmetrical regionalization of the Cx40 gene expression that is superimposed on the functional regionalization. In addition, comparison of Cx40 and Cx43 distribution at the above developmental stages has shown that these Cxs have overlapping (left ventricle) or complementary (atrial tissue and right ventricle) expression patterns.
Key Words: connexin • gene expression • heart
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