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Defects in Kim-1 Do Not Result In Delayed Graft Function After Kidney Transplantation

R. S. Suri1, J. Lee2, M. Ban3, B. Shrum2, O. Z. Ismail4, S. Leckie5, A. McIntyre3, Q. Xu6, S. H. Lee2, S. de Chickera2, R. A. Hegele2, L. Gunaratnam2

1Research Institute of the McGill University Health Center, Montreal, QC, Canada, 2Schulich School of Medicine and Dentistry, Western University, Lodnon, ON, Canada, 3Robarts Research Institute, Lodnon, ON, Canada, 4University of Alberta, Edmonton, AB, Canada, 5London Health Sciences Centre, Lodnon, ON, Canada, 6University of Pittsburg Medical Center, Pittsburg, PA

Meeting: 2022 American Transplant Congress

Abstract number: 672

Keywords: Epithelial cells, Genomics, Graft function, Kidney transplantation

Topic: Basic Science » Basic Science » 14 - Ischemia Reperfusion

Session Information

Session Name: Ischemia Reperfusion

Session Type: Poster Abstract

Date: Saturday, June 4, 2022

Session Time: 5:30pm-7:00pm

 Presentation Time: 5:30pm-7:00pm

Location: Hynes Halls C & D

*Purpose: Tissue repair is critical to restore organ function after ischemia-reperfusion injury (IRI) during transplantation. During renal injury, upregulation of kidney injury molecule-1 (KIM-1) transforms kidney epithelial cells into phagocytes which, via KIM-1 mucin domain, bind to and engulf apoptotic and necrotic cells. In murine models, KIM-1-mediated phagocytosis reduces renal dysfunction and promotes repair after native kidney and transplant-related IRI, but this has not been studied in humans.

*Methods: We expressed three common mucin domain nonsynonymous variants (rs12522248, rs45439103, rs6149307) of the human KIM-1 gene (HAVCR1) in human kidney cells and tested phagocytic capacity of the resulting proteins. To determine if impaired KIM-1-mediated phagocytosis predisposes to acute kidney injury after IRI in humans, we genotyped 627 consecutive kidney donors and assessed risk of delayed graft function (DGF) in recipients.

*Results: Cells expressing these variants exhibited markedly reduced phagocytosis of apoptotic and necrotic cells, with rs6149307 being the most severe (<5% phagocytosis). Risk of DGF in recipients of donor kidneys homozygous for rs6149307 was not significantly increased compared to recipients of donor kidneys with one or no copies (adjusted relative risk 1.0 [0.7-1.3]).

*Conclusions: Contrary to prevailing theory, our results suggest KIM-1-mediated phagocytosis is not essential for tissue repair after renal IRI in humans.

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To cite this abstract in AMA style:

Suri RS, Lee J, Ban M, Shrum B, Ismail OZ, Leckie S, McIntyre A, Xu Q, Lee SH, Chickera Sde, Hegele RA, Gunaratnam L. Defects in Kim-1 Do Not Result In Delayed Graft Function After Kidney Transplantation [abstract]. Am J Transplant. 2022; 22 (suppl 3). https://atcmeetingabstracts.com/abstract/defects-in-kim-1-do-not-result-in-delayed-graft-function-after-kidney-transplantation/. Accessed May 30, 2025.

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