Consecutive isoproterenol and adenosine treatment confers marked protection against reperfusion injury in adult but not in immature heart: A role for glycogen

Martin Lewis*, Adrian Szobi, Dirki Balaska, Igor Khaliulin, Adriana Adameova, Elinor Griffiths, Clive H. Orchard, M. Saadeh Suleiman

*Corresponding author for this work

Research output: Contribution to journalArticle (Academic Journal)peer-review

1 Citation (Scopus)
249 Downloads (Pure)

Abstract

Consecutive treatment of adult rat heart with isoproterenol and adenosine (Iso/Aden), known to consecutively activate PKA/PKC signaling, is cardioprotective against ischemia and reperfusion (I/R). Whether this is cardioprotective in an immature heart is unknown. Langendorff–perfused hearts from adult and immature (60 and 14 days old) male Wistar rats were exposed to 30 min ischemia and 120 min reperfusion, with or without prior perfusion with 5 nM Iso for 3 min followed by 30 µM Aden for 5 min. Changes in hemodynamics (developed pressure and coronary flow) and cardiac injury (Lactate Dehydrogenase (LDH) release and infarct size) were measured. Additional hearts were used to measure glycogen content. Iso induced a similar inotropic response in both age groups. Treatment with Iso/Aden resulted in a significant reduction in time to the onset of ischemic contracture in both age groups whilst time to peak contracture was significantly shorter only in immature hearts. Upon reperfusion, the intervention reduced cardiac injury and functional impairment in adults with no protection of immature heart. Immature hearts have significantly less glycogen content compared to adult. This work shows that Iso/Aden perfusion confers protection in an adult heart but not in an immature heart. It is likely that metabolic differences including glycogen content contribute to this difference.

Original languageEnglish
Article number494
JournalInternational Journal of Molecular Sciences
Volume19
Issue number2
DOIs
Publication statusPublished - 7 Feb 2018

Keywords

  • Adenosine
  • CAMP
  • Cardioprotection
  • Glycogen
  • Immature heart
  • Ischemia
  • Isoproterenol

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