Vital Mechanism of NETs Formation vs. Suicidal Mechanism of NETs Formation During Normal Pregnancy and Preeclampsia

Pre-Eclampsia Clinical Trial

— GrossNETs  

Official title:

A Retrospective Study of Vital Mechanism of NETs Formation vs. Suicidal Mechanism of NETs Formation During Normal Pregnancy and Preeclampsia

Clinical Trial Details — Status: Completed

Administrative data

• NCT number: NCT05470712
• Other study ID #: NIMAO/2022-1/SB-01
• Status: Completed
• Start date: July 20, 2022
• Est. completion date: December 31, 2022

Study information

• Verified date: February 2023
• Source: Centre Hospitalier Universitaire de Nimes
• Contact: n/a
• Is FDA regulated: No
• Study type: Observational

Clinical Trial Summary

Formation of neutrophil extracellular traps (NETs) is a process of activation of neutrophils, which then generate filaments containing DNA, enzymes and extracellular histones. Two mechanisms of formation of NETs are described in the literature: vital mechanism via Toll Like Receptors (TLRs) and suicidal mechanism, dependent on the reactive oxygen species (ROS) pathway. The description of these two mechanisms of formation of NETs is recent and no data exist in the context of pregnancy.

Description:

This is a descriptive pilot study on a ready-constituted biobank. It is an ancillary study to a previous cohort (RCB number: 2014-A01120-47, NCT01736826). Pregnancy generates an increased risk of thrombosis, and placenta-mediated diseases constitute a risk factor for cardiovascular pathologies responsible for significant maternal-fetal morbidity and mortality. Understanding and exploring the cellular and molecular mechanisms of dysfunctions of the vascular-placental interface could provide arguments to understand the systemic vascular risk, characterize it and finally detect it on the basis of new markers, thus opening the way for targeted preventive management to reinforce the general principles of precision medicine. Formation of NETs is a process of activation of neutrophils, which then generate filaments containing DNA, enzymes and extracellular histones. Formation of NETs occurs in pregnancy and is increased in vascular-placental complications. It can be studied by measuring circulating histones, particularly the citrullinated histone H3. Levels of this modified histone H3, as well as those of two other modifications, have recently been shown to increase during pregnancy. These levels have also been shown to be even greater in pregnancy complications. Furthermore, two mechanisms of formation of NETs are described in the literature: vital mechanism via Toll Like Receptors (TLRs) and suicidal mechanism, dependent on the reactive oxygen species (ROS) pathway. The description of these two mechanisms of formation of NETs is recent and no data exist in the context of pregnancy. The aim of this study is to describe the part of these two mechanisms in normal and complicated pre-eclampsia pregnancies in order to obtain a better physiopathological knowledge of pre-eclampsia to propose new circulating biomarkers and to develop new therapeutic strategies for placental vascular pathologies.

Recruitment information / eligibility

• Status: Completed
• Enrollment: 26
• Est. completion date: December 31, 2022
• Est. primary completion date: December 31, 2022
• Accepts healthy volunteers: No
• Gender: Female
• Age group: 18 Years and older

Eligibility

Not applicable as this study is on samples from a biobank. Inclusion criteria:

The inclusion criteria for the previous cohort (NCT01736826) were:

• pregnant women followed at Nimes University hospital for normal pregnancy or pregnancy with placental vascular pathology (pre-eclampsia and/or intra-uterine growth retardation).
• The patient must have given her free and informed consent and signed the consent form.
• The patient must be a member or beneficiary of a health insurance plan
• Only women are included
• Patients are at least 18 years old Exclusion Criteria: Not applicable as this is a study on samples from a biobank. The non-inclusion criteria of

the previous cohort (NCT01736826) were :

• twin pregnancies.

Related Conditions & MeSH terms

• Eclampsia
• Pre-Eclampsia

Locations

Country	Name	City	State
France	CHU Nimes	Nimes

Sponsors (1)

Lead Sponsor	Collaborator
Centre Hospitalier Universitaire de Nimes

Country where clinical trial is conducted

France, 

Outcome

Type	Measure	Description	Time frame	Safety issue
Primary	To evaluate vital mechanism of NETs formation between pregnant women with normal pregnancies and those developing preeclampsia.	Evaluation of vital mechanism of NETs formation between pregnant women with normal pregnancies and those developing preeclampsia.	3 months
Secondary	To compare the proportion of vital mechanism of NETs formation in the presence or absence of a TLR-blocking antibody within each group: normal pregnancy and preeclamptic pregnancy.	Evaluation of the proportion of vital mechanism of NETs formation in the presence or absence of a TLR-blocking antibody within each group: normal pregnancy and preeclamptic pregnancy.	3 months
Secondary	To compare the proportion of vital mechanism of NETs formation in the presence of a TLR-blocking antibody between pregnant women with normal pregnancies and those developing preeclampsia.	Evaluation of the proportion of vital mechanism of NETs formation in the presence of a TLR-blocking antibody between pregnant women with normal pregnancies and those developing preeclampsia.	3 months
Secondary	To compare vital and suicidal mechanisms of NETs formation between pregnant women with a normal pregnancy and those developing preeclampsia.	Evaluation of vital and suicidal mechanisms of NETs formation between pregnant women with a normal pregnancy and those developing preeclampsia.	3 months
Secondary	To compare vital and suicidal mechanisms of NETs formation in the presence or absence of a TLR blocking antibody or ROS inhibitor (DPI) separately within each group: normal pregnancy and preeclamptic pregnancy.	Evaluation of vital and suicidal mechanisms of NETs formation in the presence or absence of a TLR blocking antibody or ROS inhibitor (DPI) separately within each group: normal pregnancy and preeclamptic pregnancy.	3 months
Secondary	To compare vital and suicidal mechanisms of NETs formation in the presence of TLR blocking antibody or ROS inhibitor (DPI) between pregnant women with normal pregnancy and those developing preeclampsia.	Evaluation of vital and suicidal mechanisms of NETs formation in the presence of TLR blocking antibody or ROS inhibitor (DPI) between pregnant women with normal pregnancy and those developing preeclampsia.	3 months
Secondary	To compare the proportion of suicidal mechanism of NETs formation between pregnant women with a normal pregnancy and those developing preeclampsia.	Evaluation of the proportion of suicidal mechanism of NETs formation between pregnant women with a normal pregnancy and those developing preeclampsia.	3 months
Secondary	To compare suicidal mechanism of NETs formation in the presence or absence of ROS inhibitor (PGD) separately within each group: normal pregnancy and preeclamptic pregnancy.	Evaluation of suicidal mechanism of NETs formation in the presence or absence of ROS inhibitor (PGD) separately within each group: normal pregnancy and preeclamptic pregnancy.	3 months
Secondary	To compare the proportion of suicidal mechanism of NETs formation in the presence of an ROS inhibitor (PGD) between pregnant women with a normal pregnancy and those developing preeclampsia.	Evaluation of the proportion of suicidal mechanism of NETs formation in the presence of an ROS inhibitor (PGD) between pregnant women with a normal pregnancy and those developing preeclampsia	3 months