Role of Epoxyeicosatrienoic Acids in Chronic Allograft Nephropathy - The TRANSPLANT-EETs Study

Not Applicable

Completed

• Conditions: Kidney Transplant Recipients
• Interventions: Procedure: Blood sampling; Procedure: flow-mediated distal stimulation of the forearm radial artery by cutaneous heating

• Registration Number: NCT02555566
• Lead Sponsor: University Hospital, Rouen

Brief Summary

Endothelial lesions within the transplanted kidney are a major determinant of chronic allograft nephropathy. Epoxyeicosatrienoic acids (EETs) are endothelium-derived hyperpolarizing factors with anti-inflammatory, antiproliferative and vasodilator properties.

The main goal of the investigators' study is to evaluate whether genetic polymorphisms of specific enzymes responsible for the bioavailability of EETs are associated with post-transplant kidney function.

To this end, 80 kidney transplant recipients will be included. Prespecified genetic polymorphisms of CYP 2J2, CYP 2C8, CYP 2C9, CYP 2C9, CYP 2C19 and EPHX2 will be determined. Kidney function will be recorded 3, 6, 12 and 36 months after transplantation. Flow-mediated dilatation, EETs and circulating biomarkers of endothelial function will be measured in the radial artery.

The expected results of this study to provide preliminary evidence supporting a beneficial role of an increase in the bioavailability of EETs in kidney transplant recipients.

Detailed Description

Not available

Study Timeline

• Study Start: 2014-03
• Study First Submitted: 2015-09-17
• Study First Submitted QC: 2015-09-17
• Study First Posted: 2015-09-21
• Status Verified: 2016-12
• Primary Completion: 2016-12
• Study Completion: 2016-12
• Last Update Submitted: 2016-12-06
• Last Update Posted: 2016-12-07

Recruitment & Eligibility

• Status: COMPLETED
• Sex: All
• Target Recruitment: 80

Inclusion Criteria

• Patient aged 18 to 75 yo
• Caucasian (because of different CYP epoxygenase polymorphisms)
• First kidney transplantation performed in Rouen University Hospital after 2000, and at least 12 months before inclusion
• Patient having read, understood and approved the informed consent
• Efficient contraception in child-bearing aged women
• Regular health insurance

Exclusion Criteria

• Primary non-function, or allograft loss before 1 year
• Previous kidney transplantation
• History of psychiatric, psychologic or sensorial disorder preventing the patient from correctly understanding the protocol
• History of bilateral arm or forearm arteriovenous fistula
• Counter-indication to trinitrin
• Insufficient understanding of written or spoken French language
• Liberty-deprived patient
• Pregnancy or absence of contraception in child-bearing aged women
• Patient enrolled in another research protocol within 2 weeks before inclusion

Study & Design

• Study Type: INTERVENTIONAL
• Study Design: SINGLE_GROUP

Arm && Interventions

Group	Intervention	Description
Kidney transplant recipients	flow-mediated distal stimulation of the forearm radial artery by cutaneous heating	blood sampling is done for determination of EPHX Lys55Arg and other polymorphisms status in Kidney transplant recipients. flow-mediated distal stimulation of the forearm radial artery by cutaneous heating is assessed for evaluation of EEts level in Kidney transplant recipients.
Kidney transplant recipients	Blood sampling	blood sampling is done for determination of EPHX Lys55Arg and other polymorphisms status in Kidney transplant recipients. flow-mediated distal stimulation of the forearm radial artery by cutaneous heating is assessed for evaluation of EEts level in Kidney transplant recipients.

Primary Outcome Measures

Name	Time	Method
Difference between patients with the EPHX2 Lys55Arg polymorphism and patients without in estimated Glomerular Filtration Rate (eGFR)	12 Months after transplantation	eGFR Scores range from 0 \[kidney failure\] to \>90 \[normal function\]

Secondary Outcome Measures

Name	Time	Method
Difference between variation of diameter of the forearm radial artery after distal cutaneous heating for patients with the specified polymorphisms.	Day 1	Variation of diameter of the radial artery is measured in millimeter.
Difference between patients with the EPHX2 Lys55Arg polymorphism and patients without in estimated Glomerular Filtration Rate (eGFR)	36 Months after transplantation	eGFR Scores range from 0 \[kidney failure\] to \>90 \[normal function\]
Difference between patients with specified polymorphisms and patients without in estimated Glomerular Filtration Rate (eGFR)	36 Months after transplantation	eGFR Scores range from 0 \[kidney failure\] to \>90 \[normal function\]
Difference between blood EETs concentration at baseline and after distal cutaneous heating for patients with the specified polymorphisms.	Day 1	EEts plasma concentration is measured using liquid chromatography coupled to tandem mass spectrometry before and after distal cutaneous heating. Unit is ng per mL
Difference between blood EETs concentration at baseline and after distal cutaneous heating for patients without the specified polymorphisms.	Day 1	EEts plasma concentration is measured using liquid chromatography coupled to tandem mass spectrometry before and after distal cutaneous heating. Unit is ng per mL
Difference between variation of diameter of the forearm radial artery after distal cutaneous heating for patients without the specified polymorphisms.	Day 1	Variation of diameter of the radial artery is measured in millimeter.

Trial Locations

Locations (1)

Rouen University Hospital; 🇫🇷 Rouen, France