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Am J Physiol Cell Physiol 253: C645-C651, 1987;
0363-6143/87 $5.00
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AJP - Cell Physiology, Vol 253, Issue 5 C645-C651, Copyright © 1987 by American Physiological Society

ARTICLES

Cardiac myocyte guanosine transport and metabolism

T. P. Geisbuhler, D. A. Johnson and M. J. Rovetto
Department of Physiology, School of Medicine, University of Missouri, Columbia 65212.

Guanosine transport and metabolism were examined in adult rat cardiac myocytes. Myocytes transported guanosine via saturable [Km = 18 microM, maximum velocity (Vmax) = 3.61 pmol.mg-1.s-1] and nonsaturable (rate constant = 1.47 X 10(-2] processes. The saturable process was inhibited by nitrobenzyl-thioinosine, inosine [inhibition constant (Ki) = 180 microM], and adenosine (Ki = 112 microM). Extracellular guanosine taken up by myocytes was slowly phosphorylated to guanine nucleotides. The majority of guanosine (98%) existed as free intracellular guanosine after 60 s. Countertransport of nucleosides could not be demonstrated in these cells at physiological concentrations in the presence of up to a 10-fold gradient of nucleoside. These studies indicate that adult rat cardiac myocytes can be used to assess myocardial guanosine transport separate from its metabolism. Comparable inhibition of guanosine and adenosine transport by each other and by inosine support the hypothesis that guanosine and adenosine are transported by a common carrier.


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