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Adenosine-induced increase in myocardinal ATP: Are there beneficial effects for the ischaemic myocardium?

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Summary

The adenosine triphosphate (ATP) content of isolated Langendorff-perfused rat hearts may be increased by more than 40% above the normal value by a 2-h perfusion with adenosine (15 μmol/l). This metabolic manipulation was used to investigate the hypothetical relationship between total tissue ATP content and ischaemia-induced contractile failure, ischaemic contracture and post-ischaemic functional recovery.

Adenosine perfused hearts were submitted to 20 min of normothermic ischaemia and reperfused for 45 min with or without adenosine. Control experiments were performed with adenosine-free preischaemic perfusion. In identically designed experiments the tissue-protective effect of diltiazem (0.5 μmol/l) was determined and compared with the experiments with adenosine.

At the end of 120 min of preischaemic perfusion, the ATP content of the adenosine treated hearts was 34.3±1.8 μmol/g dry weight (control=23.6±1.9 μmol/g, p<0.01). After a period of 20 min of normothermic ischaemia, the ATP content of the adenosine hearts decreased to 13.3± .4 μmol/g, whereas ATP fell to 8.3±1.6 μmol/g in the control hearts. The creatine phosphate (CP) levels of adenosine hearts were significantly lower than those of the control group before ischaemia, but did not show major differences following ischaemia.

During ischaemia, the contractile activity measured via an intraventricular balloon catheter, as well as ischaemic contracture did not differ between the adenosine and control hearts. The inclusion of diltiazem into the perfusate significantly delayed the onset of contracture.

After 45 min of reperfusion, ATP contents of adenosine and control hearts reached similar values (8.4±2.3 and 8.3±2.9 μmol/g, respectively). Inclusion of adenosine (15 μmol/l in the reperfusion perfusate of the adenosine experiments prevented a further decrease, but did not increase tissue ATP content. CP values of all groups showed a partial recovery upon reperfusion, they did not differ significantly.

Contractile recovery was equal in all experimental groups except for the diltiazem treated hearts, which showed during the first 10 min of reperfusion an improved mechanical performance.

It is concluded that total tissue ATP is not necessarily a good indicator of functional capabilities under conditions of normothermic ischaemia and reperfusion in the isolated rat heart.

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Author notes

  1. D. J. Hearse

    Present address: Cardiovascular Research, The Rayne Institute, St. Thomas' Hospital, SE1 7EH, London, England

Authors and Affiliations

  1. Institute of Experimental Medicine, University of Cologne, Cologne, FRG

    T. Hohlfeld, D. J. Hearse & W. Isselhard

  2. Cardiovascular Research, The Rayne Institute, St. Thomas' Hospital, SE1 7EH, London, England

    D. M. Yellon

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  1. T. Hohlfeld
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  2. D. J. Hearse
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  3. D. M. Yellon
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  4. W. Isselhard
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Additional information

This work was supported in part by grants from the British heart foundation, the British Council and the St. Thomas, Hospital Research Endowments Fund. The advice and assistance of Dr. M. Curtis and Mrs. C. Erlebach are gratefully acknowledged.

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Hohlfeld, T., Hearse, D.J., Yellon, D.M. et al. Adenosine-induced increase in myocardinal ATP: Are there beneficial effects for the ischaemic myocardium?. Basic Res Cardiol 84, 499–509 (1989). https://doi.org/10.1007/BF01908202

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