Embryonic versus adult myocardium: Adenine nucleotide degradation during ischemia

William Kenneth Mask, Anwar S. Abd-elfattah, Michael E Jessen, Louis A. Brunsting, Jon Lekven, Andrew S. Wechsler

Research output: Contribution to journalArticle

8 Scopus citations

Abstract

Neonatal myocardium demonstrates better recovery from ischemia than does adult tissue. We tested the hypothesis that developmental differences in adenine nucleotide degradation might facilitate recovery by quantitating depletion of high-energy phosphates in nine-day-old embryonic (n = 9) and 15-month-old adult (n = 14) chicken hearts at 15-, 30-, 45-, and 60-minute intervals of normothermic ischemia in vitro. Nucleotides adenosine triphosphate, adenosine diphosphate, and adenosine monopnosphate and nucleosides adenosine, inosine, hypoxanthine, and xanthine were determined by highperformance liquid chromatography. Several observations in metabolite degradative response to ischemia were noted. The embryonic myocardium maintained higher adenosine triphosphate and adenosine monophosphate levels over the course of the investigation than did mature myocardium. Moreover, the adult group showed an increase in diffusible nucleoside pool metabolites. Relative immaturity of enzymes responsible for nucleotide degradation may facilitate postiachemic recovery by preserving nondiffusible high-energy phosphate precursors to participate in salvage resynthesis of adenosine triphosphate.

Original languageEnglish (US)
Pages (from-to)109-112
Number of pages4
JournalThe Annals of Thoracic Surgery
Volume48
Issue number1
DOIs
StatePublished - Jul 1989

ASJC Scopus subject areas

  • Surgery
  • Pulmonary and Respiratory Medicine
  • Cardiology and Cardiovascular Medicine

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