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A Potential Role for IgE-Mediated Immune Response in the Pathogenesis of Chronic Antibody-Mediated Rejection

F. Rascio1, P. Pontrelli2, G. S. Netti3, E. Manno1, B. Infante1, S. Simone2, G. Castellano2, M. Seveso4, E. Cozzi4, L. Gesualdo2, G. Stallone1, G. Grandaliano1

1Department of Medical and Surgical Sciences, Nephrology Dialysis and Transplantation Unit, University of Foggia, Foggia, Italy, 2Department of Emergency, and Organ Transplantation, Nephrology, Dialysis and Transplantation Unit, University of Bari, Bari, Italy, 3Dept. of Medical and Surgical Sciences, Clinical Pathology Unit, University of Foggia, Foggia, Italy, 4Department of Cardiac, Thoracic and Vascular Sciences, Transplant Immunology Unit, University of Padua, Padova, Italy

Meeting: 2019 American Transplant Congress

Abstract number: 485

Keywords: Biopsy, Interferon (IFN), Kidney transplantation, Rejection

Session Information

Session Name: Concurrent Session: Innate Immunity; Chemokines, Cytokines, Complement

Session Type: Concurrent Session

Date: Tuesday, June 4, 2019

Session Time: 2:30pm-4:00pm

 Presentation Time: 3:30pm-3:42pm

Location: Room 310

*Purpose: Chronic antibody-mediated rejection (CAMR) is the main cause of graft loss and shares with systemic lupus erythematosus (SLE) the antibody-mediated kidney damage and the systemic activation of the interferon-alpha (IFN-alpha) pathway. IgE-mediated immune response plays a key role in the development of SLE nephritis and is associated with IFN-alpha secretion. The aim of our study was to investigate IgE-mediated immune response in CAMR grafts.

*Methods: We enrolled 40 biopsy-proven CAMR patients, 15 transplant recipients with normal graft function/histology (CTRL), 15 patients with interstitial fibrosis/tubular atrophy (IFTA) and 6 SLE patients.

*Results: We observed a significant increase in tubular and glomerular deposition of IgE in CAMR and SLE patients compared with IFTA and CTRL (p<0.001). Interestingly, the imunofluorescence for tryptase, a mast cells marker, and CD203c, a specific marker of basophil activation, revealed a significant infiltration of both cell types in CAMR grafts and a lesser extent in SLE kidneys (p=0.02). We also observed that the absolute number of circulating basophils was significantly increased in CAMR compared to CTRL and IFTA. Serum levels of MxA, an IFN-alpha-induced protein, were significantly higher in CAMR compared to CTRL patients (p=0.002) and directly associated with the extent of IgE deposits in the graft (r=0.347, p=0.01). Since it has been shown that IgE immune complex can induce IFN-alpha production by plasmacytoid dendritic cells (pDC), we investigated the presence of these antigen-presenting cells in graft biopsies. As in SLE, also in CAMR tissue we observed a significant increase in interstitial pDCs closely associated to IgE deposits.

*Conclusions: Our data suggest that IgE deposition and the subsequent recruitment of basophils and mast cells within the graft may play a key pathogenic role in CAMR. The genesis of these events appears to be linked, as in SLE, to the systemic activation of the IFN-alpha pathway.

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To cite this abstract in AMA style:

Rascio F, Pontrelli P, Netti GS, Manno E, Infante B, Simone S, Castellano G, Seveso M, Cozzi E, Gesualdo L, Stallone G, Grandaliano G. A Potential Role for IgE-Mediated Immune Response in the Pathogenesis of Chronic Antibody-Mediated Rejection [abstract]. Am J Transplant. 2019; 19 (suppl 3). https://atcmeetingabstracts.com/abstract/a-potential-role-for-ige-mediated-immune-response-in-the-pathogenesis-of-chronic-antibody-mediated-rejection/. Accessed May 9, 2025.

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