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Clinical implications of angiotensin II type 1 receptor antibodies in antibody-mediated rejection without detectable donor-specific HLA antibodies after renal transplantation

 J. Lee  ;  Y. Park  ;  B.S. Kim  ;  J.G. Lee  ;  H.J. Kim  ;  Y.S. Kim  ;  K.H. Huh 
 TRANSPLANTATION PROCEEDINGS, Vol.47(3) : 649-652, 2015 
Journal Title
Issue Date
Adolescent ; Adult ; Aged ; Biomarkers/blood ; Female ; Graft Rejection/blood ; Graft Rejection/immunology* ; HLA Antigens/blood ; HLA Antigens/immunology* ; Humans ; Immunoassay ; Isoantibodies/blood ; Isoantibodies/immunology* ; Kidney Transplantation* ; Male ; Middle Aged ; Receptor, Angiotensin, Type 1/blood ; Receptor, Angiotensin, Type 1/immunology* ; Retrospective Studies ; Young Adult
BACKGROUND: Solid-phase immunoassays have improved detection sensitivity for donor-specific HLA antibody (DSHA) and permitted the accurate diagnosis of antibody-mediated rejection (AMR). However, DSHA is not always sufficient to explain the cause of AMR. Consequently, a means of assessing non-HLA antibodies is required to determine the cause of AMR. The aim of the present study was to evaluate the clinical implications of antibodies (Abs) targeting angiotensin II type I receptor (AT1R) in recipients with AMR but without serum DSHA.
METHODS: Non-HLA AMR cases diagnosed between January 2011 and June 2014 were included. Levels of anti-AT1R Abs (U/mL) were quantified by using AT1R assay kits (One Lambda, Calif, United States) with collected sera pretransplantation and at biopsy (cut-off value: 15 U/mL).
RESULTS: Seventy-two patients were diagnosed with AMR during the above-mentioned period. Of them, 12 recipients (16.7%) had no DSHA. The sera of these 12 patients were tested (2 patients were only checked at time of biopsy). Nine patients (9/10) were presensitized for anti-AT1R Abs (median, 25.0 U/mL; range, 12.9 to 50.0 U/mL). Ten patients (10/12) were anti-AT1R- positive at time of biopsy (median, 23.2 U/mL; range, 11.4 to 50.0 U/mL). The mean time from transplantation to biopsy was 73 months. Eight patients experienced acute AMR, and 4 developed chronic AMR. Four patients showed negative C4d staining in peritubular capillaries (4/12). Patients were treated with plasmapheresis, low-dose intravenous immunoglobulin, and/or rituximab.
CONCLUSIONS: AT1R Abs may play a significant role in AMR without detectable DSHA. Pretransplantation detection of AT1R Abs may be helpful for assessing the risk for non-HLA AMR.
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1. College of Medicine (의과대학) > Dept. of Internal Medicine (내과학교실) > 1. Journal Papers
1. College of Medicine (의과대학) > Dept. of Laboratory Medicine (진단검사의학교실) > 1. Journal Papers
1. College of Medicine (의과대학) > Dept. of Surgery (외과학교실) > 1. Journal Papers
1. College of Medicine (의과대학) > Yonsei Biomedical Research Center (연세의생명연구원) > 1. Journal Papers
Yonsei Authors
Kim, Beom Seok(김범석) ORCID logo https://orcid.org/0000-0002-5732-2583
Kim, Yu Seun(김유선) ORCID logo https://orcid.org/0000-0002-5105-1567
Kim, Hye Jin(김혜진)
Park, Yong Jung(박용정) ORCID logo https://orcid.org/0000-0001-5668-4120
Lee, Jae Geun(이재근) ORCID logo https://orcid.org/0000-0002-6722-0257
Lee, Ju Han(이주한)
Huh, Kyu Ha(허규하) ORCID logo https://orcid.org/0000-0003-1364-6989
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