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Ann Thorac Surg 2000;70:890-894
© 2000 The Society of Thoracic Surgeons

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Original articles: cardiovascular

Sialyl Lewis^X oligosaccharide preserves myocardial and endothelial function during cardioplegic ischemia

^a Department of Cardiac Surgery, The Children’s Hospital, Harvard Medical School, Boston, Massachusetts, USA
^b Department of Cardiology, The Children’s Hospital, Harvard Medical School, Boston, Massachusetts, USA
^c Cytel Corporation, San Diego, California, USA

Address reprint requests to Dr Mayer, Department of Cardiovascular Surgery, Children’s Hospital, 300 Longwood Ave, Boston, MA02115
e-mail: john.mayer{at}tch.harvard.edu

Background. Neutrophil adhesion to endothelium contributes to myocardial reperfusion injury after cardiac operation. Initial neutrophil-endothelial interactions involve selectins, which bind Sialyl-Lewis^X on neutrophils. Blockade of selectin-mediated neutrophil-endothelial interactions with CY-1503, a synthetic analogue of Sialyl-Lewis^X, might reduce reperfusion injury after myocardial ischemia.

Methods. The efficacy of CY-1503 to attenuate global myocardial reperfusion injury was assessed in isolated blood-perfused neonatal lamb hearts that had 2 hours of cold cardioplegic ischemia. CY-1503 (40 mg/L) or saline vehicle was added to blood perfusate before ischemia. Contractile function (developed pressure, dP/dt) and coronary vascular endothelial function (acetylcholine response) were assessed at base line and during reperfusion. Myocardial neutrophil accumulation was assessed by myeloperoxidase quantification.

Results. Compared to controls, treatment with CY-1503 improved recovery of all indices of contractile function, preserved coronary vascular endothelial function, and reduced myocardial neutrophil accumulation.

Conclusions. In isolated neonatal lamb hearts that underwent hypothermic cardioplegic ischemia, CY-1503 administration reduced myocardial neutrophil accumulation and preserved endothelial and contractile function. Selectin blockade of leukocyte-endothelial interactions might attenuate reperfusion injury and enhance myocardial protection during cardiac surgical procedures.

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