Neonatal rat hearts cannot be protected by ischemic postconditioning

Title:

Neonatal rat hearts cannot be protected by ischemic postconditioning

Creator:

Doul, J., Zuzana Charvátová, Ivana Ošťádalová, Matej Kohutiar, Hana Maxová, and Bohuslav Ošťádal

Identifier:

https://cdk.lib.cas.cz/client/handle/uuid:70262b71-0dc5-4ad4-8e05-fec77c992273
uuid:70262b71-0dc5-4ad4-8e05-fec77c992273
issn:0862-8408

Subject:

Fyziologie člověka a srovnávací fyziologie, fyziologie, physiology, neonatal rats, ischemic postconditioning, tolerance to ischemia, contractile function, lactate dehydrogenase, 14, and 612

Type:

article, články, model:article, and TEXT

Format:

print, bez média, and svazek

Description:

Although there are abundant data on ischemic postconditioning (IPoC) in the adult myocardium, this phenomenon has not yet been investigated in neonatal hearts. To examine possible protective effects of IPoC, rat hearts isolated on days 1, 4, 7 and 10 of po stnatal life were perfused according to Langendorff. Developed force (DF) of contraction was measured by an isometric force transducer. Hearts were exposed to 40 or 60 min of global ischemia followed by reperfusion up to the maximum recovery of DF. IPoC wa s induced by three cycles of 10, 30 or 60 s periods of global ischemia/reperfusion. To further determine the extent of ischemic injury, lactate dehydrogenase (LDH) release was measured in the coronary effluent. Tolerance to ischemia did not change from day 1 to day 4 but decreased to days 7 and 10. None of the postconditioning protocols tested led to significant protection on the day 10. Prolonging the period of sustained ischemia to 60 min on day 10 did not lead to better protection. The 3x30 s protocol wa s then evaluated on days 1, 4 and 7 without any significant effects. There were no significant differences in LDH release between postconditioned and control groups. It can be concluded that neonatal hearts cannot be protected by ischemic postconditioning during first 10 days of postnatal life. and J. Doul, Z. Charvátová, I. Ošťádalová, M. Kohutiar, H. Maxová, B. Ošťádal.

Language:

English

Rights:

http://creativecommons.org/licenses/by-nc-sa/4.0/
policy:public

Source:

Physiological research | 2015 Volume:64 | Number:6

Harvested from:

CDK

Metadata only:

false