Abstract 720: Prenatal Exposure of Cigarette Smoke Impacts Cardiac Regeneration
| Autor: | Soeun Ngoy, Sudeshna Fisch, Isabel Morgado, Alessandro Evangelisti, Katharina Schimmel, Seema Dangwal, Kevin M. Alexander, Dian-Jian Lee, Jennifer E. Ward, Cheng-Yu Tsai, Ronglih Liao |
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| Rok vydání: | 2019 |
| Předmět: | |
| Zdroj: | Circulation Research. 125 |
| ISSN: | 1524-4571 0009-7330 |
| DOI: | 10.1161/res.125.suppl_1.720 |
| Popis: | Background: Neonatal mammalian hearts have the unique characteristic to fully repair and regenerate following injury. This discovery has led to visionary endeavors to understand and subsequently reawaken regeneration processes in the human adult heart that are lost after birth, contributing to heart failure and death after ischemic insults. In utero exposure to tobacco smoke has detrimental effects on fetal development and growth. However, the consequences of prenatal exposure to cigarette smoke on murine neonate’s cardiac regeneration have never been explored. Methods: To study the impact of cigarette smoke during the entire pregnancy on cardiac regeneration in the offspring, plugged female wild type C57LB/6J mice were exposed either to cigarette smoke (n=6) or filtered air (control, n=6). Two days after birth, 5 pups from each litter were assigned to the two experimental groups: Myocardial infarction (MI) and sham. Detrimental effects of in utero exposure to tobacco smoke on the recovery of cardiac function following MI surgery were followed using two-dimensional speckle tracking echocardiography and strain imaging. To investigate the underlying mechanism, cardiac tissue of the infarct and remote zone was collected for non-coding RNA analysis. Results: In utero exposure to cigarette smoke significantly compromised cardiac regeneration in neonates. At both early and late time points in the phase of cardiac repair, hearts of neonates exposed to cigarette smoke during pregnancy showed a marked impairment of cardiac regenerative potential. In particular, ejection fraction, fractional area change and shortening, as well as left ventricular internal diameter during systole remained pathologically changed following MI insult in the smoked group until the very endpoint. Conclusions: Collectively, we here provide evidence that in utero exposure to cigarette smoke strongly compromises cardiac regeneration in the newborn offspring. This result reinforces smoking cessation during pregnancy. Additionally, understanding the changes in non-coding RNA expression in a setting of preserved versus disrupted repair of the heart might be an important first step towards the identification of key cellular processes in cardiac regeneration after injury. |
| Databáze: | OpenAIRE |
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