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• W2040473018 abstract "In the cardiac muscle, the electrical coupling of myocytes by means of gap (or communicating) junctions, allows the action potentials to be propagated. Connexin 43 (CX 43) is the major constitutive protein of the gap junctions in the mammalian myocardium. In this organ, the abundance of CX 43 and of its messenger, as well as the spatial expression of this protein, are developmentally regulated. These findings are complemented by the results presented in this article, which deals with the distribution of CX 43 in the ventricular myocytes of mouse heart during differentiation, between the 11 days post coitum embryo stage and adulthood. By immunoelectron microscopy experiments on ultrathin sections of cardiac ventricular tissue of one-week-old mouse, we have provided confirmation that the anti-CX 43 antibodies used here specifically recognized the gap junctions. Double labeling immunofluorescence experiments have been undertaken to localize, within the same cells, either CX 43 and desmin, or CX 43 and Con A or WGA receptor sites. From the earliest stage investigated (11 days post coitum) onwards, expression of CX 43 is always associated with desmin-positive cells, that is, with the myocytes. Up to birth, there is in the ventricular wall a gradient of expression of CX 43 which is superimposable on a gradient of expression of desmin. Immunoreactivity to anti-CX 43 and anti-desmin antibodies is high in the sub-endocardial trabeculae and low (or even undetectable for CX 43, in the early stages) in the sub-epicardial cell layers. In the embryonic stages, the expression sites of CX 43 are visible in the form of small dots, whose abundance increases as development proceeds. During these stages, the immunoreactive sites are distributed in a relatively homogeneous pattern throughout the membrane of the myocytes. One week after birth, the CX 43 expression is restricted to the two ends of the myocytes (where the intercalated discs develop), and the adjacent lateral regions. This polarization of CX 43 is more pronounced at the two and three weeks post natal stages and in the fully differentiated ventricular myocytes (adult stage) CX 43 is only present in the intercalated discs." @default.
• W2040473018 created "2016-06-24" @default.
• W2040473018 creator A5017982462 @default.
• W2040473018 creator A5050116640 @default.
• W2040473018 creator A5070353003 @default.
• W2040473018 date "1992-09-01" @default.
• W2040473018 modified "2023-09-27" @default.
• W2040473018 title "Distribution pattern of connexin 43, a gap junctional protein, during the differentiation of mouse heart myocytes" @default.
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• W2040473018 doi "https://doi.org/10.1111/j.1432-0436.1992.tb00675.x" @default.
• W2040473018 hasPubMedId "https://pubmed.ncbi.nlm.nih.gov/1333424" @default.
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