Development of Kinetic Biomarkers of Liver Fibrosis Measuring NAFLD
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|ClinicalTrials.gov Identifier: NCT02124577|
Recruitment Status : Not yet recruiting
First Posted : April 28, 2014
Last Update Posted : December 19, 2014
|Condition or disease|
|Non-alcoholic Fatty Liver Disease|
Management of NASH and NAFLD remain a significant unmet medical challenge that is growing in importance as part of the obesity epidemic. Minimally invasive tools for monitoring disease progression and evaluating therapeutic interventions in NASH would be extremely valuable. Utilizing in vivo heavy water labeling, multiple pathways related to protein metabolism (fibrogenesis) and lipid metabolism can be quantified in human subjects. We have recently discovered that plasma lumicam synthesis represents a non-invasive kinetic biomarker of tissue fibrogenesis in patients with viral hepatitis. In addition, synthesis of fatty acids in plasma VLDL-triglycerides provide a window into hepatic lipid metabolism.
Stable isotopes have a long history as a safe, effective tracer for measuring synthesis of molecules in humans (1). Recently, new developments in stable isotope labeling techniques and advances in mass spectrometry have made in vivo kinetic measurement of slow metabolic processes possible. Through the use of 2H2O as the source of labeling, we and others have measured T-cell proliferation (2), mammary epithelial cell proliferation (3), prostate epithelial cell proliferation (4), triglyceride synthesis (5) and protein synthesis (6) in humans. We have recently evaluated this approach for the measurement of fibrogenesis patients with fibrotic liver disease.
Excess accumulation of collagen in the liver is termed fibrosis. Fibrosis is a common pathological feature of several chronic liver diseases (e.g. Hepatitis C, alcoholic liver disease, primary biliary sclerosis, drug/toxin induced liver disease, etc.). Currently, the standard method for detection of fibrosis is liver biopsy and histochemical analyses of tissue collagen content (8, 9). Although effective in diagnosing existing, advanced fibrosis, a single biopsy cannot measure current disease activity or predict rate of progression. To determine whether disease is progressing using current methods, a second biopsy is required. If significant additional collagen has accumulated since the first biopsy, this suggests that the disease is progressing. However, this measurement represents the history of the disease, not the current disease activity at the time of the second biopsy. There are also significant limitations in current methods, since changes in collagen pool size measurable by histochemistry cannot measure small changes in collagen content and intra-laboratory variability inherent in histochemical assays reduce their sensitivity (10, 11).
This stable isotope / mass spectrometry based method will be applied here for the quantification of fibrogenesis in vivo (from a bone marrow biopsy) and the identification of novel biomarkers of fibrogenesis in plasma in patients receiving investigational therapies.
If successful, this research will identify plasma proteins which can be easily measured by tandem mass spectrometry (LC/MS/MS) methods and whose synthesis rate reflects disease activity in the heart. Ideally, a set of markers related to NASH/ NAFLD will be developed that can detect and differentiate among multiple disease phenotypes, based on the kinetic signature measured in a single blood draw from a patient labeled with deuterated water.
The role of de novo lipogenesis (DNL) has been suggested by several clinical studies (Donnelly JCI 2005, Puri Hepatology 2009). DNL contributes significantly to the accumulation of lipid in NASH (Donnelly JCI 2005). Moreover DNL is elevated in many other inflammatory states and may be a useful marker of hepatic inflammation. DNL as well as hepatic TG assembly and cholesterogenesis are easily measured in plasma or dried blood spot samples from patients consuming 2H2O, after several days of labeling the plasma DNL reaches a steady state and reflects hepatic DNL rates.
|Study Type :||Observational [Patient Registry]|
|Estimated Enrollment :||50 participants|
|Observational Model:||Case Control|
|Target Follow-Up Duration:||8 Weeks|
|Official Title:||Development of Kinetic Biomarkers of Liver Fibrosis Based on Stable Isotope Mass Spectrometry Techniques for Measuring Nonalcoholic Fatty Liver Disease NAFLD)|
|Study Start Date :||May 2014|
|Estimated Primary Completion Date :||May 2019|
|Estimated Study Completion Date :||May 2019|
- evaluate stable isotope/mass spectrometric methods [ Time Frame: Basline ]Our primary aim is to evaluate stable isotope/mass spectrometric methods for measuring in vivo liver collagen synthesis (fibrogenesis) and liver lipogenesis rates using liver biopsy specimens from patients with Non-Alcoholic Steatohepatitis (NASH)/ Nonalcoholic fatty liver disease (NAFLD).
- serum or urine markers of liver fibrogenesis that can be measured by the same stable isotope/mass spectrometric approach [ Time Frame: Basline ]Our secondary aim is to look for new serum or urine markers of liver fibrogenesis that can be measured by the same stable isotope/mass spectrometric approach in the same subjects. Subjects will drink the safe, non-toxic stable isotope heavy water (2H2O, deuterated water) prior to having a liver biopsy and providing urine and blood samples.
Biospecimen Retention: Samples With DNA
Stored specimen The specimens (serum, plasma, urine, stool, saliva, liver tissue, and DNA) collected as part of this study will be kept in Dr. Loomba' s locked research freezer at the Clinical Teaching Facility (CTF-building A).All collected data and patient charts will be maintained at the CTF building in a locked computer file with access available to the principal and study investigators only.
All samples and data will be labeled with a code number. The name, address, social security number, date of birth and other personal identifiers will not be available on the sample, and we will not give out any information that identifies the patient to the researchers who use these samples and data.
To learn more about this study, you or your doctor may contact the study research staff using the contact information provided by the sponsor.
Please refer to this study by its ClinicalTrials.gov identifier (NCT number): NCT02124577
|Contact: Leander A Lazarofirstname.lastname@example.org|
|Contact: Phirum Nguyenemail@example.com|
|United States, California|
|University of California, San Diego||Not yet recruiting|
|San Diego, California, United States, 92103|
|Contact: Leander A Lazaro 619-471-3915|
|Contact: Phirum S. Nguyen 619-471-0774 firstname.lastname@example.org|
|Principal Investigator: Rohit Loomba, MD|
|Principal Investigator:||Rohit Loomba, MD||University of California, San Diego|