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• W1896602788 abstract "Cardioplegic arrest is a model of ischemia/reperfusion injury and results in the death of irreplaceable cardiac myocytes by a programmed cell death or apoptosis. Signal transducers and activators of transcription (STAT) signaling pathways play an important role in the modulation of apoptosis after ischemia and reperfusion. Angiotensin II type 1 (AT1) receptor antagonist added to cardioplegia could represent an additional modality for enhancing myocardial protection during cardioplegic arrest. To test that hypothesis, we studied the effect of AT1 receptor antagonism and cardioplegia temperature perfusion on STATs modulation during cardioplegic arrest in neonatal rat hearts. Isolated, nonworking hearts (n = 4 per group) from neonatal rats were perfused aerobically in the Langendorff mode according to the following scheme: Dulbecco's Modified Eagle's Medium solution (Group 1); cold (4°C) modified St. Thomas' Hospital no. 2 (MSTH2) cardioplegic solution (Group 2); cold (4°C) MSTH2 cardioplegic solution plus AT1 antagonist (Valsartan) (Group 3); and warm (34°C) MSTH2 cardioplegic solution (Group 4). Thus, myocytes were isolated by enzymatic digestion, and STAT1, STAT2, STAT3, and STAT5 were investigated in Western blot studies. Times to arrest after cardioplegia were 6-10 s for all groups with the exception of Group 1 (spontaneous arrest after 12-16 s). Total cardioplegia delivery volume was about 300 mL in 15 min. Perfusion with cold MSTH2 supplemented with AT1 receptor antagonist (Group 3) induced a significant reduction in STAT1, STAT2, and STAT5 tyrosine phosphorylation versus other groups (P < 0.05). The decreased activation of STAT1, STAT2, and STAT5 observed in Group 3 was accompanied by reduction of interleukin-1β (P < 0.05). On the other hand, STAT3 activation was significantly reduced in Groups 1 and 4 (P < 0.05). Only perfusion with AT1 receptor antagonist supplemented with cold MSTH2 significantly decreases the inflammatory response of the neonatal rat cardiomyocytes without affecting antiapoptotic influence provided by activation of STAT3. Therefore, AT1 receptor antagonist could play a pivotal role in cytoprotective effect and cardiac recovery in neonates and infants." @default.
• W1896602788 created "2016-06-24" @default.
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• W1896602788 date "2013-05-03" @default.
• W1896602788 modified "2023-09-27" @default.
• W1896602788 title "Effects of Angiotensin II Type 1 Receptor Antagonist and Temperature on Prolonged Cardioplegic Arrest in Neonatal Rat Myocytes" @default.
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• W1896602788 doi "https://doi.org/10.1111/aor.12069" @default.
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