Complement Activation and Thrombotic Microangiopathies.

HELLP syndrome alternative antibodies atypical hemolytic uremic syndrome complement C9 complement activation complement membrane complement pathway complement system proteins eculizumab endothelial cells female fibrin fluorescent antibody technique humanized humans hypertension malignant monoclonal pre-eclampsia pregnancy recurrence thrombotic microangiopathies

Journal

Clinical journal of the American Society of Nephrology : CJASN
ISSN: 1555-905X
Titre abrégé: Clin J Am Soc Nephrol
Pays: United States
ID NLM: 101271570

Informations de publication

Date de publication:
06 12 2019
Historique:
received: 13 05 2019
accepted: 02 10 2019
pubmed: 7 11 2019
medline: 2 12 2020
entrez: 8 11 2019
Statut: ppublish

Résumé

Atypical hemolytic uremic syndrome is a form of thrombotic microangiopathy caused by dysregulation of the alternative complement pathway. There is evidence showing complement activation in other thrombotic microangiopathies. The aim of this study was to evaluate complement activation in different thrombotic microangiopathies and to monitor treatment response. Complement activation was assessed by exposing endothelial cells to sera or activated-patient plasma-citrated plasma mixed with a control sera pool (1:1)-to analyze C5b-9 deposits by immunofluorescence. Patients with atypical hemolytic uremic syndrome ( Acute phase atypical hemolytic uremic syndrome-activated plasma induced an increased C5b-9 deposition on endothelial cells. Standard and lower doses of eculizumab inhibited C5b-9 deposition in all patients with atypical hemolytic uremic syndrome, except in two who showed partial remission and clinical relapse. Significant fibrin formation was observed together with C5b-9 deposition. Results obtained using activated-plasma samples were more marked and reproducible than those obtained with sera. C5b-9 deposition was also increased with samples from patients with HELLP (all cases) and preeclampsia (90%) at disease onset. This increase was sustained in those with HELLP after 40 days, and levels normalized in patients with both HELLP and preeclampsia after 6-9 months. Complement activation in those with malignant hypertension was at control levels. The proposed methodology identifies complement overactivation in patients with atypical hemolytic uremic syndrome at acute phase and in other diseases such as HELLP syndrome and preeclampsia. Moreover, it is sensitive enough to individually assess the efficiency of the C5 inhibition treatment.

Sections du résumé

BACKGROUND AND OBJECTIVES
Atypical hemolytic uremic syndrome is a form of thrombotic microangiopathy caused by dysregulation of the alternative complement pathway. There is evidence showing complement activation in other thrombotic microangiopathies. The aim of this study was to evaluate complement activation in different thrombotic microangiopathies and to monitor treatment response.
DESIGN, SETTING, PARTICIPANTS, & MEASUREMENTS
Complement activation was assessed by exposing endothelial cells to sera or activated-patient plasma-citrated plasma mixed with a control sera pool (1:1)-to analyze C5b-9 deposits by immunofluorescence. Patients with atypical hemolytic uremic syndrome (
RESULTS
Acute phase atypical hemolytic uremic syndrome-activated plasma induced an increased C5b-9 deposition on endothelial cells. Standard and lower doses of eculizumab inhibited C5b-9 deposition in all patients with atypical hemolytic uremic syndrome, except in two who showed partial remission and clinical relapse. Significant fibrin formation was observed together with C5b-9 deposition. Results obtained using activated-plasma samples were more marked and reproducible than those obtained with sera. C5b-9 deposition was also increased with samples from patients with HELLP (all cases) and preeclampsia (90%) at disease onset. This increase was sustained in those with HELLP after 40 days, and levels normalized in patients with both HELLP and preeclampsia after 6-9 months. Complement activation in those with malignant hypertension was at control levels.
CONCLUSIONS
The proposed methodology identifies complement overactivation in patients with atypical hemolytic uremic syndrome at acute phase and in other diseases such as HELLP syndrome and preeclampsia. Moreover, it is sensitive enough to individually assess the efficiency of the C5 inhibition treatment.

Identifiants

pubmed: 31694864
pii: 01277230-201912000-00010
doi: 10.2215/CJN.05830519
pmc: PMC6895490
doi:

Substances chimiques

Antibodies, Monoclonal, Humanized 0
Complement Membrane Attack Complex 0
eculizumab A3ULP0F556

Types de publication

Journal Article Research Support, Non-U.S. Gov't

Langues

eng

Sous-ensembles de citation

IM

Pagination

1719-1732

Commentaires et corrections

Type : CommentIn

Informations de copyright

Copyright © 2019 by the American Society of Nephrology.

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Auteurs

Marta Palomo (M)

Josep Carreras Leukaemia Research Institute.
Hematopathology, Department of Pathology, Centre de Diagnostic Biomedic (CDB), Hospital Clinic de Barcelona, Institut d'Investigacions Biomediques August Pi i Sunyer (IDIBAPS), Universitat de Barcelona, Barcelona, Spain.
Barcelona Endothelium Team, Barcelona, Spain.

Miquel Blasco (M)

Department of Nephrology and Renal Transplantation, Hospital Clinic de Barcelona, Universitat de Barcelona, Spain.
Group of nephro-urological diseases and renal transplantation (IDIBAPS), Barcelona, Spain.

Patricia Molina (P)

Hematopathology, Department of Pathology, Centre de Diagnostic Biomedic (CDB), Hospital Clinic de Barcelona, Institut d'Investigacions Biomediques August Pi i Sunyer (IDIBAPS), Universitat de Barcelona, Barcelona, Spain.

Miquel Lozano (M)

Apheresis Unit, Department of Hemotherapy and Hemostasis, Institut Clinic de Malalties Hematologiques i Oncologiques (ICMHO), IDIBAPS, Hospital Clinic de Barcelona, Universitat de Barcelona, Barcelona, Spain.

Manuel Praga (M)

Department of Nephrology, Hospital Universitario 12 de Octubre and Research Institute i+12, Madrid, Spain.
Department of Medicine, Universidad Complutense, Madrid, Spain.

Sergi Torramade-Moix (S)

Hematopathology, Department of Pathology, Centre de Diagnostic Biomedic (CDB), Hospital Clinic de Barcelona, Institut d'Investigacions Biomediques August Pi i Sunyer (IDIBAPS), Universitat de Barcelona, Barcelona, Spain.

Julia Martinez-Sanchez (J)

Josep Carreras Leukaemia Research Institute.
Hematopathology, Department of Pathology, Centre de Diagnostic Biomedic (CDB), Hospital Clinic de Barcelona, Institut d'Investigacions Biomediques August Pi i Sunyer (IDIBAPS), Universitat de Barcelona, Barcelona, Spain.
Barcelona Endothelium Team, Barcelona, Spain.

Joan Cid (J)

Apheresis Unit, Department of Hemotherapy and Hemostasis, Institut Clinic de Malalties Hematologiques i Oncologiques (ICMHO), IDIBAPS, Hospital Clinic de Barcelona, Universitat de Barcelona, Barcelona, Spain.

Gines Escolar (G)

Hematopathology, Department of Pathology, Centre de Diagnostic Biomedic (CDB), Hospital Clinic de Barcelona, Institut d'Investigacions Biomediques August Pi i Sunyer (IDIBAPS), Universitat de Barcelona, Barcelona, Spain.

Enric Carreras (E)

Josep Carreras Leukaemia Research Institute.
Barcelona Endothelium Team, Barcelona, Spain.

Cristina Paules (C)

Fetal i+D Fetal Medicine Research Center, BCNatal - Barcelona Center for Maternal-Fetal and Neonatal Medicine (Hospital Clinic de Barcelona and Hospital Sant Joan de Deu), ICGON, IDIBAPS, Universitat de Barcelona and Centro de Investigación Biomédica en Red de Enfermedades Raras (CIBER-ER), Barcelona, Spain.

Fatima Crispi (F)

Fetal i+D Fetal Medicine Research Center, BCNatal - Barcelona Center for Maternal-Fetal and Neonatal Medicine (Hospital Clinic de Barcelona and Hospital Sant Joan de Deu), ICGON, IDIBAPS, Universitat de Barcelona and Centro de Investigación Biomédica en Red de Enfermedades Raras (CIBER-ER), Barcelona, Spain.

Luis F Quintana (LF)

Department of Nephrology and Renal Transplantation, Hospital Clinic de Barcelona, Universitat de Barcelona, Spain.
Group of nephro-urological diseases and renal transplantation (IDIBAPS), Barcelona, Spain.

Esteban Poch (E)

Department of Nephrology and Renal Transplantation, Hospital Clinic de Barcelona, Universitat de Barcelona, Spain.
Group of nephro-urological diseases and renal transplantation (IDIBAPS), Barcelona, Spain.

Lida Rodas (L)

Department of Nephrology and Renal Transplantation, Hospital Clinic de Barcelona, Universitat de Barcelona, Spain.

Emma Goma (E)

Department of Nephrology and Renal Transplantation, Hospital Clinic de Barcelona, Universitat de Barcelona, Spain.

Johann Morelle (J)

Division of Nephrology, Cliniques universitaires Saint-Luc, Institut de Recherche Expérimentale et Clinique, Université catholique de Louvain, Brussels, Belgium.

Mario Espinosa (M)

Department of Nephrology, Hospital Universitario Reina Sofía e Instituto Maimonides de Investigaciones Biológicas de Córdoba (IMIBIC), Córdoba, Spain.

Enrique Morales (E)

Department of Nephrology, Hospital Universitario 12 de Octubre and Research Institute i+12, Madrid, Spain.

Ana Avila (A)

Department of Nephrology and Renal Transplantation, Hospital Universitario Dr Peset, Valencia, Spain.

Virginia Cabello (V)

Department of Nephrology, Hospital Virgen del Rocio, Sevilla, Spain.

Gema Ariceta (G)

Department of Pediatric Nephrology, Hospital Materno-Infantil, Vall d'Hebron, Universitat Autonoma de Barcelona, Barcelona, Spain.

Sara Chocron (S)

Department of Pediatric Nephrology, Hospital Materno-Infantil, Vall d'Hebron, Universitat Autonoma de Barcelona, Barcelona, Spain.

Joaquin Manrique (J)

Department of Nephrology, Complejo Hospitalario de Navarra, Pamplona, Spain.

Xoana Barros (X)

Department of Nephrology, Hospital Universitari Josep Trueta, Girona, Spain.

Nadia Martin (N)

Department of Nephrology, Hospital Universitari Josep Trueta, Girona, Spain.

Ana Huerta (A)

Department of Nephrology, Hospital Puerta de Hierro Majadahonda, Madrid, Spain.

Gloria M Fraga-Rodriguez (GM)

Department of Pediatric Nephrology, Hospital de la Santa Creu i Sant Pau, Universitat Autonoma de Barcelona, Barcelona, Spain.

Mercedes Cao (M)

Department of Nephrology, Complejo Hospitalario Universitario A Coruña, Coruña, Spain.

Marisa Martin (M)

Department of Nephrology, Hospital Universitari Arnau de Vilanova, Lleida, Spain.

Ana Maria Romera (AM)

Department of Nephrology, Hospital General Universitario, Ciudad Real, Spain.

Francesc Moreso (F)

Department of Nephrology, Hospital Universitari Vall d'Hebron, Universitat Autonoma Barcelona, Barcelona, Spain.

Anna Manonelles (A)

Kidney Transplant Unit, Department of Nephrology, Hospital de Bellvitge, Universitat de Barcelona, Barcelona, Spain; and.

Eduard Gratacos (E)

Fetal i+D Fetal Medicine Research Center, BCNatal - Barcelona Center for Maternal-Fetal and Neonatal Medicine (Hospital Clinic de Barcelona and Hospital Sant Joan de Deu), ICGON, IDIBAPS, Universitat de Barcelona and Centro de Investigación Biomédica en Red de Enfermedades Raras (CIBER-ER), Barcelona, Spain.

Arturo Pereira (A)

CDB, Barcelona, Spain.

Josep M Campistol (JM)

Department of Nephrology and Renal Transplantation, Hospital Clinic de Barcelona, Universitat de Barcelona, Spain.

Maribel Diaz-Ricart (M)

Hematopathology, Department of Pathology, Centre de Diagnostic Biomedic (CDB), Hospital Clinic de Barcelona, Institut d'Investigacions Biomediques August Pi i Sunyer (IDIBAPS), Universitat de Barcelona, Barcelona, Spain.
Barcelona Endothelium Team, Barcelona, Spain.

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