Journal of the American Heart Association
The systemic inflammation that occurs after exposure to cardiopulmonary bypass (CPB), which is especially severe in neonatal patients, is associated with poorer outcomes and is not well understood. In order to gain deeper insight into how exposure to bypass activates inflammatory responses in circulating leukocytes, we studied changes in microRNA (miRNA) expression during and after exposure to bypass. miRNAs are small noncoding RNAs that have important roles in modulating protein levels and function of cells.
Methods and Results:
We performed miRNA‐sequencing on leukocytes isolated from neonatal patients with CPB (n=5) at 7 time points during the process of CPB, including before the initiation of bypass, during bypass, and at 3 time points during the first 24 hours after weaning from bypass. We identified significant differentially expressed miRNAs using generalized linear regression models, and miRNAs were defined as statistically significant using a false discovery rate–adjusted P
The unbiased profiling of the miRNA changes that occur in the circulating leukocytes of patients with bypass provides deeper insight into the mechanisms that underpin the systemic inflammatory response that occurs in patients after exposure to CPB. These data will help the development of novel treatments and biomarkers for bypass‐associated inflammation.
cardiopulmonary bypass, inflammation, microRNA, neonate
Hsieh L, Tu LN, Paquette A, Sheng Q, Zhao S, Bittel D, O'Brien J, Vickers K, Pastuszko P, Nigam V. microRNA Expression Levels Change in Neonatal Patients During and After Exposure to Cardiopulmonary Bypass. Journal of the American Heart Association. 2022; 11(17). doi: 10.1161/JAHA.122.025864.