TY - JOUR
T1 - Cardiac dysfunction in transgenic mouse fetuses overexpressing shortened type XIII collagen
AU - Tahkola, Jenni
AU - Räsänen, Juha
AU - Sund, Malin
AU - Mäkikallio, Kaarin
AU - Autio-Harmainen, Helena
AU - Pihlajaniemi, Taina
N1 - Funding Information:
This work was supported by grants from the Research Council for Health of the Academy of Finland (115237), the Sigrid Jusélius Foundation, the Aarne Koskelo Foundation, the Finnish Medical Foundation, and the Academy of Finland (J.R.). J.Tahkola.M.Sund.T.Pihlajaniemi(*) Oulu Center to Cell-Matrix Research, Biocenter Oulu, Department of Medical Biochemistry and Molecular Biology, University of Oulu, P. O. Box 5000, 90014 Oulu, Finland e-mail: taina.pihlajaniemi@oulu.fi
PY - 2008/7
Y1 - 2008/7
N2 - Overexpression of type XIII collagen molecules with an 83-amino-acid residue in-frame deletion of part of the ectodomain leads to fetal lethality in Col13a1 COL2del transgenic mice. We characterize here the functional disturbances in the cardiovascular system of mouse fetuses overexpressing mutant type XIII collagen. Doppler ultrasonography was performed at 12.5 days of gestation on 33 fetuses resulting from heterozygous matings of seven female mice and on 16 fetuses from two matings between heterozygous and wild-type mice. Nine fetuses had atrioventricular valve regurgitation (AVVR), and all of them were transgene-positive. The fetuses with AVVR had a lower outflow mean velocity (Vmean; P<0.005) and a greater proportion of isovolumetric relaxation time (IRT%) in the cardiac cycle (P<0.0001) than those without AVVR, and their ductus venosus pulsatility indices for veins (DV PIV) and the umbilical artery pulsatility indices were increased. A positive correlation was found between IRT% and DV PIV, and a negative correlation was seen between outflow Vmean and DV PIV. Morphological analysis of the heart revealed no differences between the two groups of fetuses, but histological analysis showed the trabeculation of the ventricles to be reduced and the myocardium to be thinner in the fetuses with AVVR. Based on in situ hybridization, type XIII collagen mRNAs were normal constituents of these structures. Moreover, a positive correlation was found between outflow V mean and myocardial thickness. IRT% and DV PIV correlated negatively with myocardial thickness. Thus, overexpression of mutant type XIII collagen results in mid-gestation cardiac dysfunction in mouse fetuses, and these disturbances in cardiac function may lead to death in utero.
AB - Overexpression of type XIII collagen molecules with an 83-amino-acid residue in-frame deletion of part of the ectodomain leads to fetal lethality in Col13a1 COL2del transgenic mice. We characterize here the functional disturbances in the cardiovascular system of mouse fetuses overexpressing mutant type XIII collagen. Doppler ultrasonography was performed at 12.5 days of gestation on 33 fetuses resulting from heterozygous matings of seven female mice and on 16 fetuses from two matings between heterozygous and wild-type mice. Nine fetuses had atrioventricular valve regurgitation (AVVR), and all of them were transgene-positive. The fetuses with AVVR had a lower outflow mean velocity (Vmean; P<0.005) and a greater proportion of isovolumetric relaxation time (IRT%) in the cardiac cycle (P<0.0001) than those without AVVR, and their ductus venosus pulsatility indices for veins (DV PIV) and the umbilical artery pulsatility indices were increased. A positive correlation was found between IRT% and DV PIV, and a negative correlation was seen between outflow Vmean and DV PIV. Morphological analysis of the heart revealed no differences between the two groups of fetuses, but histological analysis showed the trabeculation of the ventricles to be reduced and the myocardium to be thinner in the fetuses with AVVR. Based on in situ hybridization, type XIII collagen mRNAs were normal constituents of these structures. Moreover, a positive correlation was found between outflow V mean and myocardial thickness. IRT% and DV PIV correlated negatively with myocardial thickness. Thus, overexpression of mutant type XIII collagen results in mid-gestation cardiac dysfunction in mouse fetuses, and these disturbances in cardiac function may lead to death in utero.
KW - Atrioventricular valve regurgitation
KW - Col13a1
KW - Collagen
KW - Heart failure
KW - Mouse
KW - Ultrasonics
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U2 - 10.1007/s00441-008-0617-5
DO - 10.1007/s00441-008-0617-5
M3 - Article
C2 - 18481090
AN - SCOPUS:45649085212
SN - 0302-766X
VL - 333
SP - 61
EP - 69
JO - Cell and tissue research
JF - Cell and tissue research
IS - 1
ER -