TY - JOUR
T1 - Myocardial Response in Preterm Fetal Sheep Exposed to Systemic Endotoxinaemia
AU - Seehase, Matthias
AU - Gantert, Markus
AU - Ladenburger, Andreas
AU - Garnier, Yves
AU - Kunzmann, Steffen
AU - Thomas, Wolfgang
AU - Wirbelauer, Johannes
AU - Speer, Christian P.
AU - Kramer, Boris W.
PY - 2011/9
Y1 - 2011/9
N2 - Exposure of the fetus to antenatal inflammation can occur from chorioamnionitis, which may progress to a fetal inflammatory response syndrome (FIRS) and to fetal sepsis. We tested whether the fetal myocardium responded to systemic Gram-negative endotoxinaemia. We hypothesized that the myocardium would respond to inflammation by changes in hypoxia-inducible factor-a (HIF-1 alpha), inducible NO-synthase (iNOS), Toll-like receptors 2 and 4 (TLR2 and TLR4), IL-6, and phosphorylated signal transducer and activator of transcription-3 (pSTAT3). To model systemic endotoxinaemia, fetal sheep were exposed to Gram-negative endotoxin or saline iv. 3 d before preterm delivery at 113 d of gestation (term = 147 d). All endotoxin-exposed animals developed cardiac dysfunction within these 72 h. Cardiac mRNA and protein levels of HIF-1 alpha and TLR2 and TLR4 mRNA increased, whereas STAT3 phosphorylation decreased significantly. IL-6 and iNOS mRNA remained unchanged. Fetal systemic endotoxinaemia induced myocardial inflammation by activating TLR2 and 4. The following cardiac dysfunction seems not to be mediated via cardiac iNOS. (Pediatr Res 70: 242-246, 2011)
AB - Exposure of the fetus to antenatal inflammation can occur from chorioamnionitis, which may progress to a fetal inflammatory response syndrome (FIRS) and to fetal sepsis. We tested whether the fetal myocardium responded to systemic Gram-negative endotoxinaemia. We hypothesized that the myocardium would respond to inflammation by changes in hypoxia-inducible factor-a (HIF-1 alpha), inducible NO-synthase (iNOS), Toll-like receptors 2 and 4 (TLR2 and TLR4), IL-6, and phosphorylated signal transducer and activator of transcription-3 (pSTAT3). To model systemic endotoxinaemia, fetal sheep were exposed to Gram-negative endotoxin or saline iv. 3 d before preterm delivery at 113 d of gestation (term = 147 d). All endotoxin-exposed animals developed cardiac dysfunction within these 72 h. Cardiac mRNA and protein levels of HIF-1 alpha and TLR2 and TLR4 mRNA increased, whereas STAT3 phosphorylation decreased significantly. IL-6 and iNOS mRNA remained unchanged. Fetal systemic endotoxinaemia induced myocardial inflammation by activating TLR2 and 4. The following cardiac dysfunction seems not to be mediated via cardiac iNOS. (Pediatr Res 70: 242-246, 2011)
U2 - 10.1203/PDR.0b013e318225fbcb
DO - 10.1203/PDR.0b013e318225fbcb
M3 - Article
C2 - 21629153
SN - 0031-3998
VL - 70
SP - 242
EP - 246
JO - Pediatric Research
JF - Pediatric Research
IS - 3
ER -