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J Thorac Cardiovasc Surg 1998;115:978-982
© 1998 Mosby, Inc.

CARDIAC AND PULMONARY REPLACEMENT

The relationship of ischemia-reperfusion injury of transplanted lung and the up-regulation of major histocompatibility complex II on host peripheral

Sponsor: G. Frank O.Tyers, MD

Funded by the Cystic Fibrosis Society.

Read at the Seventy-seventh Annual Meeting of The American Association for Thoracic Surgery, Washington, D.C., May 4-7, 1997.

Received for publication May 7, 1997. Revisions requested July 15, 1997; revisions received Nov. 11. 1997. Accepted for publication Nov. 11, 1997. Address for reprints: A. K. Qayumi, MD, PhD, Associate Professor, Department of Surgery, University of British Columbia, 3100-910 West 10th Ave., Vancouver, BC, Canada V5Z 4E3.

Abstract

Objectives: This study was designed to examine the relationship between ex vivo preservation time of the transplanted lung and the extent of injury and to relate this to the severity of rejection with and without allogenicity.
Methods: Single lung transplantation was performed on two groups of domestic swine. Group A (n = 7) and group B (n = 6) had ex vivo preservation times of 4 and 15 hours, respectively, at 4° C hypothermia. Group C (n = 6) underwent 2 hours of warm ischemia via dissection and isolation of the left lung with ligation of its bronchial artery and crossclamping of the left pulmonary artery, vein, and bronchus without explantation. Assessment measures included lung function, antioxidant enzyme activities in the plasma and lung tissue, levels of inflammatory mediators in the recipient plasma, and quantification of major histocompatibility complex II HLA-DR-ß on host peripheral lymphocytes.
Results:: All groups demonstrated increases in interleukin-10, lung weight, and HLA-DR-ß expression and decreases in lung-tissue antioxidant enzyme activities, gas exchange, and lung compliance. There was a strong positive correlation between ex vivo preservation time and the expression of HLA-DR-ß and a negative correlation between ischemic time and lung-tissue superoxide dismutase.
Conclusions: These results suggest that the intensity of the host immunogenic response is related to the severity of ischemia-reperfusion injury and is independent of tissue incompatibility and/or the type of ischemic insult. We conclude that the extension of ex vivo preservation time may predispose the transplanted lung to more severe rejection.

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