Complement Activation and Thrombotic Microangiopathies.
Adult
Antibodies, Monoclonal, Humanized
/ therapeutic use
Atypical Hemolytic Uremic Syndrome
/ drug therapy
Complement Activation
Complement Membrane Attack Complex
/ metabolism
Female
HELLP Syndrome
/ immunology
Humans
Male
Pre-Eclampsia
/ drug therapy
Pregnancy
Thrombotic Microangiopathies
/ drug therapy
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
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
1719-1732Commentaires et corrections
Type : CommentIn
Informations de copyright
Copyright © 2019 by the American Society of Nephrology.
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