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2015 ; 19
(6
): 1375-89
Nephropedia Template TP
gab.com Text
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The sinus venosus myocardium contributes to the atrioventricular canal: potential
role during atrioventricular node development?
#MMPMID25752780
Kelder TP
; Vicente-Steijn R
; Harryvan TJ
; Kosmidis G
; Gittenberger-de Groot AC
; Poelmann RE
; Schalij MJ
; DeRuiter MC
; Jongbloed MR
J Cell Mol Med
2015[Jun]; 19
(6
): 1375-89
PMID25752780
show ga
The presence of distinct electrophysiological pathways within the
atrioventricular node (AVN) is a prerequisite for atrioventricular nodal
reentrant tachycardia to occur. In this study, the different cell contributions
that may account for the anatomical and functional heterogeneity of the AVN were
investigated. To study the temporal development of the AVN, the expression
pattern of ISL1, expressed in cardiac progenitor cells, was studied in sequential
stages performing co-staining with myocardial markers (TNNI2 and NKX2-5) and HCN4
(cardiac conduction system marker). An ISL1+/TNNI2+/HCN4+ continuity between the
myocardium of the sinus venosus and atrioventricular canal was identified in the
region of the putative AVN, which showed a pacemaker-like phenotype based on
single cell patch-clamp experiments. Furthermore, qPCR analysis showed that even
during early development, different cell populations can be identified in the
region of the putative AVN. Fate mapping was performed by in ovo vital dye
microinjection. Embryos were harvested and analysed 24 and 48 hrs post-injection.
These experiments showed incorporation of sinus venosus myocardium in the
posterior region of the atrioventricular canal. The myocardium of the sinus
venosus contributes to the atrioventricular canal. It is postulated that the
myocardium of the sinus venosus contributes to nodal extensions or transitional
cells of the AVN since these cells are located in the posterior region of the
AVN. This finding may help to understand the origin of atrioventricular nodal
reentrant tachycardia.