| Intrasplenic preconditioning: a model for the study of xenostimuli accommodation. | |
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MedLine Citation:
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PMID: 20080251 Owner: NLM Status: In-Data-Review |
Abstract/OtherAbstract:
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BACKGROUND: Discordant xenotransplantation, the grafting of organs from one phylogenic species to another, results in hyper-acute rejection (HAR). HAR is associated with the deposition of recipient preformed xenoreactive natural antibodies and complement on the endothelium of the donor organ, leading to activation and apoptosis of the endothelium, an event associated with xenograft rejection. Endothelial resistance to HAR, termed "accommodation," an active protection of graft endothelium, may be achieved by previous stimulation of endothelial cells by discordant xenoantibodies. MATERIALS AND METHODS: Forty-eight male Wistar rats were used to evaluate HAR induction in an isolated, dually perfused in-situ rat liver transfused with human blood. This ex-vivo model served to mimic rat-to-human liver xenotransplantation. Preconditioning of the liver endothelium was induced by rat intrasplenic injection of human blood (n=8) or effluent of previously xenotransfused rat liver (n=8), i.e., high versus low xenoantibody solution, each undertaken 1d before liver xenotransfusion. Two other groups were not preconditioned. Preconditioned and non-preconditioned rats were perfused directly with human blood, and eight rats were used as controls (non-preconditioned Krebs-perfused). Eight rats were perfused directly with human blood, and eight rats were used as controls. The effluent that exited these first-line livers was used to perfuse the second-line livers. RESULTS: Portal and hepatic artery perfusion pressures, resistances, rates of oxygen extraction, lactic acid and pH, and wet-to-dry weight ratio values were significantly increased in livers xenotransfused with blood indicating HAR, compared with unchanged values in livers perfused with Krebs solution. Portal pressure and resistance were best protected from HAR by the blood preconditioning in the blood perfused group, while the hepatic artery perfusion system was better protected by the perfusate precondition-blood perfused group. The physiologic effects of HAR were attenuated in most second-line livers. CONCLUSIONS: Attenuation of HAR in rats' livers is achieved by preconditioning with xenoantibodies and/or by "filtering out" xenoantibodies present in the circulation, and is suggestive of accommodation. This novel method may be useful in future studies aimed at refining methods for accommodating xenotransplantation. |
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Authors:
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Roman Telpner; Ron Ben-Abraham; Yifat Klein; Richard Nakache; Wisam Khoury; Avi A Weinbroum |
Publication Detail:
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Type: Journal Article Date: 2009-09-23 |
Journal Detail:
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Title: The Journal of surgical research Volume: 168 ISSN: 1095-8673 ISO Abbreviation: J. Surg. Res. Publication Date: 2011 Jun |
Date Detail:
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Created Date: 2011-05-02 Completed Date: - Revised Date: - |
Medline Journal Info:
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Nlm Unique ID: 0376340 Medline TA: J Surg Res Country: United States |
Other Details:
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Languages: eng Pagination: 135-42 Citation Subset: IM |
Copyright Information:
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Copyright © 2011 Elsevier Inc. All rights reserved. |
Affiliation:
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Department of Anesthesia and Critical Care Medicine, Tel Aviv Sourasky Medical Center affiliated with the Sackler Faculty of Medicine, Tel Aviv University, Tel Aviv, Israel. |
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From MEDLINE®/PubMed®, a database of the U.S. National Library of Medicine
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