Pyrophosphate Homeostasis and Hepatic Expression of ABCC6.Pyro-TH

  • days left to enroll
  • participants needed
  • sponsor
    Centre Hospitalier Universitaire de Nice
Updated on 22 January 2021
liver transplant


In animals, normal hepatic expression of ABCC6 (ATP-binding transporter cassette, subfamily C, member 6) determines plasma pyrophosphate (PPi) concentration. PPi prevents the formation of hydroxyapatite crystals on tissues by precipitation of calcium and inorganic phosphate (Pi). It is an endogenous compound whose deficiency causes diffuse vascular calcifications in certain rare monogenic diseases, including the elastic pseudoxanthoma caused by the mutation of ABCC6. PPi is produced by enzymatic transformation of extracellular ATP and, in animals, the liver is the main supplier of ATP and PPi (more than 90%). In humans, liver transplantation offers the possibility of correlating the plasma concentration of PPi ([PPi]pl) with hepatic expression of ABCC6. Liver transplantation is performed in the treatment of chronic liver failure (Child B or C) or, in the absence of liver failure, in the treatment of hepatocellular carcinoma. By measuring[PPi]pl before transplantation and after liver function restoration and by measuring ABCC6 in the diseased liver and healthy liver, it is possible to determine whether liver failure is associated with decreased[PPi]pl and decreased liver expression of ABCC6, which is the objective of our pilot study. Its interest is to establish a physiopathological link between the frequent vascular calcifications in obese patients with hepatic steatosis and the production of PPi.

prupose: Look for a deficit in[PPi]pl in patients before the transplant compared to the phase of restoration of liver function

Condition Hepatic Insufficiency, Hepatic Failure, Liver Failure
Treatment Blood sample
Clinical Study IdentifierNCT03576859
SponsorCentre Hospitalier Universitaire de Nice
Last Modified on22 January 2021


Yes No Not Sure

Inclusion Criteria

Indication for liver transplantation Age greater than or equal to 18 years
Patients affiliated to social security

Exclusion Criteria

Patient not affiliated to social security Non-consenting patient or unable to
understand the protocol and how it works Fulminant Hepatitis
Clear my responses

How to participate?

Step 1 Connect with a study center
What happens next?
  • You can expect the study team to contact you via email or phone in the next few days.
  • Sign up as volunteer to help accelerate the development of new treatments and to get notified about similar trials.

You are contacting

Investigator Avatar

Primary Contact



Additional screening procedures may be conducted by the study team before you can be confirmed eligible to participate.

Learn more

If you are confirmed eligible after full screening, you will be required to understand and sign the informed consent if you decide to enroll in the study. Once enrolled you may be asked to make scheduled visits over a period of time.

Learn more

Complete your scheduled study participation activities and then you are done. You may receive summary of study results if provided by the sponsor.

Learn more

Similar trials to consider


Browse trials for

Not finding what you're looking for?

Every year hundreds of thousands of volunteers step forward to participate in research. Sign up as a volunteer and receive email notifications when clinical trials are posted in the medical category of interest to you.

Sign up as volunteer

user name

Added by • 



Reply by • Private

Lorem ipsum dolor sit amet consectetur, adipisicing elit. Ipsa vel nobis alias. Quae eveniet velit voluptate quo doloribus maxime et dicta in sequi, corporis quod. Ea, dolor eius? Dolore, vel!

  The passcode will expire in None.

No annotations made yet

Add a private note
  • abc Select a piece of text from the left.
  • Add notes visible only to you.
  • Send it to people through a passcode protected link.
Add a private note