PAR Family Polymorphisms and Placental Invasion Disorders

January 25, 2007 updated by: Shaare Zedek Medical Center
The present study will be undertaken to establish whether genetic variations of PAR1 could be involved in the occurrence of any of the "placental syndromes" of preterm delivery, preeclampsia, and/or small for gestational age babies and recurrent pregnancy loss.

Study Overview

Status

Unknown

Conditions

Intervention / Treatment

Detailed Description

Polymorphisms of Protease Activated Receptor 1 and adverse pregnancy outcomes Protease Activated Receptor 1 (PAR1), the main thrombin receptor on vascular cells (Coughlin,1999), plays a critical role in orchestrating human placentation based on temporally and spatially constrained PAR1 expression in the normal invasive trophoblasts (O'Brien et al, 2003) and its overexpression in pathological invasive trophoblast (Even-Ram et al, 2003).

Various proteases of the PAR family as well as matrix metalloproteinases have been implicated in ancillary regulation of cancer metastases and tumor-related angiogenesis. PAR1 in particular has been proposed to be involved in invasive processes of various cancers (Ruf & Mueller, 2006; Boire et al, 2005). Similarly, it might be surmised that remodeling of the placenta microenvironment as well as the requisites of trophoblast invasiveness may be PAR1 sensitive (Grisaru-Granovsky et al, 2005). Therefore, one might hypothesize that PAR1 gene variability may be involved in early placentation and that adverse pregnancy outcomes of the "placental syndromes" may have their origin in PAR1 dysregulation.

Study Design: This is a prospective case-control pilot study. Subject enrolment and data collection will be performed via the Admission Service of the Division for Maternal & Fetal Medicine in a large tertiary obstetrics department in Jerusalem, Israel. Demographic data including maternal characteristics, past reproductive history, and information about previous complications during pregnancy, delivery and the neonatal period will be culled. The blood samples will be collected at routine admission after obtaining informed consent by the physician on the floor.

Four groups are described: patients with spontaneous preterm delivery of a singleton before 35 weeks of gestation; patients with a singleton pregnancy complicated by preeclampsia diagnosed according the Working Group Criteria (2000); patients who deliver a small for gestational age (SGA) singleton defined as a birth weight below the 10th percentile for the gestational age according to the Israeli growth curves (Dollberg et al, 2005); and for comparison, patients who deliver a singleton at term with appropriate size for gestational age. Patients who suffer delivery with intrauterine fetal demise and/or neonates with malformations will be excluded.

Maternal and umbilical cord blood samples (in 0.11mol/l sodium tri citrate) will be paired. DNA will be prepared from white blood cells by standard techniques and subsequently stored at -4°C for batched analysis. The laboratory staff will be blinded as to the clinical status of the samples.

Polymorphism analysis will be performed for the following polymorphisms of the PAR1 gene: [-1426CT], [506 insertion of 13 bp],[IVS-14A/T]: as per standard PCR techniques using appropriate restriction endonucleases (Arnaud et l, 2000).

Study Type

Observational

Enrollment

100

Contacts and Locations

This section provides the contact details for those conducting the study, and information on where this study is being conducted.

Participation Criteria

Researchers look for people who fit a certain description, called eligibility criteria. Some examples of these criteria are a person's general health condition or prior treatments.

Eligibility Criteria

Ages Eligible for Study

20 years to 40 years (Adult)

Accepts Healthy Volunteers

Yes

Genders Eligible for Study

Female

Description

Inclusion Criteria:

  • Women with reccurent abortions unexplained
  • Premature delicery

Exclusion Criteria:

  • Term pregnancies
  • Abortion that the cause is known

Study Plan

This section provides details of the study plan, including how the study is designed and what the study is measuring.

How is the study designed?

Design Details

Collaborators and Investigators

This is where you will find people and organizations involved with this study.

Sponsor

Shaare Zedek Medical Center

Investigators

  • Principal Investigator: Sorina Grisaru, MD, Shaare Zedek Medical Center

Publications and helpful links

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Helpful Links

Study record dates

These dates track the progress of study record and summary results submissions to ClinicalTrials.gov. Study records and reported results are reviewed by the National Library of Medicine (NLM) to make sure they meet specific quality control standards before being posted on the public website.

Study Major Dates

Study Start

March 1, 2007

Study Completion

November 1, 2007

Study Registration Dates

First Submitted

January 22, 2007

First Submitted That Met QC Criteria

January 22, 2007

First Posted (Estimate)

January 23, 2007

Study Record Updates

Last Update Posted (Estimate)

January 26, 2007

Last Update Submitted That Met QC Criteria

January 25, 2007

Last Verified

January 1, 2007

More Information

Terms related to this study

Keywords

Additional Relevant MeSH Terms

Other Study ID Numbers

  • PAR1 polymorphisms

This information was retrieved directly from the website clinicaltrials.gov without any changes. If you have any requests to change, remove or update your study details, please contact register@clinicaltrials.gov. As soon as a change is implemented on clinicaltrials.gov, this will be updated automatically on our website as well.

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