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Thomas Yeh, Jr
Ivan M. Rebeyka
Rebecca J. Dignan
Cornelius M. Dyke
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Ann Thorac Surg 1994;58:409-415
© 1994 The Society of Thoracic Surgeons

Articles

Orotic acid improves left ventricular recovery four days after heterotopic transplantation

Thomas Yeh, Jr, MD*, Ivan M. Rebeyka, MD, Emma R. Jakoi, PhD, Danna E. Johnson, MD, Rebecca J. Dignan, MD, Cornelius M. Dyke, MD, Andrew S. Wechsler, MD

Departments of Surgery, Pathology, and Neurology, Medical College of Virginia/Virginia Commonwealth University, Richmond, Virginia USA

* Address reprint requests to Dr Yeh, Department of Surgery, Medical College of Virginia, PO Box 645, MCV Station, Richmond, VA 23298.

Orotic acid accelerates compensatory myocardial hypertrophy after regional ischemia and improves left ventricular function acutely after global ischemia. In this study, the effect of orotic acid on left ventricular function was investigated 4 days after global ischemia (75 minutes, 21 °C) using heterotopically transplanted rabbit hearts (n = 18). Experimental animals received daily 100-mg/kg doses of intraperitoneally administered orotic acid, starting 1 day before transplantation, and showed a threefold increase in the serum level of orotic acid by 4 days. After 1 hour of reperfusion, the developed pressure was equally depressed in both the control and experimental groups; however, 4 days later, the developed pressure in control animals was decreased by 3 ± 3 mm Hg (versus the developed pressure measured at 1 hour) while the developed pressure in experimental animals was significantly increased by 25 ± 8 mm Hg. Heterotopically transplanted hearts manifested diminished systolic function (stemming from ischemia and unloading) as well as decreased expression of adult myosin. Because orotic acid has been observed to produce an increase in protein synthesis in other models, we investigated whether this improvement in systolic function resulted from an orotic acid-mediated augmentation (or preservation) of normal adult myosin expression. Both orotic acid-treated and untreated hearts manifested decreased expression of the β-myosin heavy chain protein and steady-state messenger RNA levels. Because function improved with decreased β-myosin heavy chain expression, an alternate mechanism underlying orotic acid-mediated improvement in function is implicated. Nevertheless, orotic acid may be a therapeutic agent facilitating long-term recovery from global ischemia.




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A. D. Cochrane, S. Pathik, J. J. Smolich, R. A. J. Conyers, and F. L. Rosenfeldt
Depressed Function in Remote Myocardium After Myocardial Infarction: Influence of Orotic Acid
Ann. Thorac. Surg., December 1, 1996; 62(6): 1765 - 1772.
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