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Active, Not Recruiting

NCT Number: NCT05965973

Diet Impact on Hepatic Transcriptomics and Lipidomics in Pre-diabetes

Non-alcoholic fatty liver disease (NAFLD) is one of the most common liver diseases, affecting 25% to 30% of the global population and nearly one third of the population in North America. NAFLD is defined as an excessive accumulation of lipids within hepatocytes in the absence of significant alcohol consumption or other causes of chronic liver disease. These patients usually present with hepatic steatosis observed on imaging studies and elevated liver enzymes with clinical features of insulin resistance (IR), including pre-diabetes, type 2 diabetes mellitus (T2DM), arterial hypertension, dyslipidemia, and visceral obesity. The minimum criterion for a histologic diagnosis of NAFLD is >5 percent steatotic hepatocytes in a liver tissue section. The exact mechanism for the development of NAFLD is unclear, although the current evidence indicates that it is likely a complex interplay among neurohormones, intestinal dysbiosis, nutrition, and genetics. IR plays a crucial role in NAFLD pathophysiology mainly by increasing adipocyte lipolysis, resulting in the circulation of more free fatty acids available for hepatic uptake and increasing hepatic de novo lipogenesis. There is yet no approved pharmacologic option for the treatment of NAFLD. Current international guidelines on NAFLD emphasize the importance of lifestyle modifications for all patients with NAFLD and recommend 7-10% of weight loss and a "healthy diet", without suggesting any particular diet. Recent data provide some support for the beneficial role of low carbohydrate (CHO)/high unsaturated fatty acid (both monounsaturated (MUFAs) and polyunsaturated (PUFAs)) dietary patterns for decreasing hepatic steatosis. This proposal addresses this important research gap by leading to advances regarding the impact of a short-term low CHO/high PUFAs/MUFAs dietary intervention on improving hepatic gene expression profiles and lipid composition in individuals with pre-diabetes. The proposed study is unique because all meals and foods will be provided to participants under carefully controlled isocaloric conditions to maintain a constant bodyweight with optimal energy and macronutrient intake control. The primary objective of the proposed research is to investigate how replacement of dietary CHOs by unsaturated fatty acids (both PUFAs and MUFAs) affects liver fat composition and liver transcriptomics in subjects with pre-diabetes.

Active, Not Recruiting

This study is active but is not currently recruiting participants.

Key information

Age range

18 year–60 year

Sex eligibility

All sexes

Study type

Interventional

Phase

Not applicable

Primary location

Institute of Nutrition and Functional Foods (INAF)

Québec, Quebec, G1V 0A6, Canada

Who can participate

Healthy volunteers accepted: No

Only the study team can determine whether someone qualifies for participation.

Inclusion criteria

  • Males and females 18 to 60 years of age.
  • Non-smoker
  • Waist circumference > 102 cm for men and > 88 cm for women.
  • Plasma triglyceride levels > 1,7 mmol/L at the screening visit.
  • Fasting plasma glucose levels > 6,1 mmol/L at the screening visit.
  • Fasting plasma insulin levels above the upper limit of normal at the screening visit.
  • Subjects must be willing to give written informed consent and able to adhere to the diet schedule and visit schedule.
  • Patients should be otherwise healthy, without abnormal renal function or coagulation.

Exclusion criteria

  • Patients with extreme dyslipidemias, such as familial hypercholesterolemia will be excluded.
  • Subjects will be excluded if they have cardiovascular disease (CHD, cerebrovascular disease or peripheral arterial disease) or if they are taking other medications known to affect lipoprotein metabolism (eg. steroids, beta blockers, thiazide diuretics, other lipid lowering agents, significant alcohol intake etc.).
  • Subjects who are in a situation or have any condition that, in the opinion of the investigator, may interfere with optimal participation in the study.
  • Individuals with a history of mental instability, drug or alcohol abuse within the past 2 years or individuals who have been treated or are being treated for severe psychiatric illness that, in the opinion of the investigator, may interfere with optimal participation in the study.
  • Disorders of the hematologic, digestive, or central nervous systems, including cerebrovascular disease and degenerative disease, that would limit study evaluation or participation.
  • Known impairment of renal function (creatinine >2.0 mg/dL), dysproteinemia, nephrotic syndrome, or other renal disease.
  • Subjects with coagulopathy (prothrombin time [PT] or partial thromboplastin time [PTT] at Visit 1 higher than 1.5 times control).
  • Patients who are known to have tested positive for human immunodeficiency virus (HIV).
  • Patients who have used any investigational drug within 30 days of the first clinic visit.
  • Diabetic patients are excluded from the study. Uncontrolled endocrine or metabolic disease known to influence serum lipids or lipoproteins. Clinically euthyroid subjects on replacement doses of thyroid hormone are eligible for enrollment.

Treatment and study plan

Low fat diet

Other

During 3 days, subjects eat a diet low in fat (percent of total caloric intake: 15.0% from proteins; 65.0% from carbohydrates; 20.0% from fat: 4.0% from saturated fat; 10.0% from monounsaturated fat; 6.0% from polyunsaturated fat

High fat diet

Other

During 3 days, subjects eat a diet high in fat (percent of total caloric intake: 15.0% from proteins; 45.0% from carbohydrates; 40.0% from fat: 8.0% from saturated fat; 22.0% from monounsaturated fat; 10.0% from polyunsaturated fat

Primary outcomes

  1. Change in the expression of key genes in lipid metabolism including LDL-receptor, acetyl-CoA acetyltransferase 2, apolipoprotein B, proproprotein convertase subtilisin/kexin type 9, microsomal triglyceride transfer protein

    Time frame: At Day 3 and day 20 (at the end of the two 3-day diets)

  2. Change in the expression of key genes in liver inflammation including C-reactive protein, Interleukin-6, Interleukin-15, cell adhesion molecules, E-selectin

    Time frame: At Day 3 and day 20 (at the end of the two 3-day diets)

  3. Change in the expression of key genes in hepatic fibrogenesis including transforming growth factor beta 1, a-smooth muscle actin, type-1 collagen, connective tissue growth factor

    Time frame: At Day 3 and day 20 (at the end of the two 3-day diets)

Secondary outcomes

  1. Change in liver's key lipid pathways (lipidomics) including lysophosphatidylcholine, phosphatidylcholine, diglyceride.

    Time frame: At Day 3 and day 20 (at the end of the two 3-day diets)

  2. Identify bacteria strains involved in the control of blood glucose such as C elegans.

    Time frame: At Day 3 and day 20 (at the end of the two 3-day diets)

Sponsors and collaborators

Lead sponsor

Laval University

Other

Registry information

Official study title

Short-term Impact of a Low Carbohydrate/high Unsaturated Fat Diet on Hepatic Transcriptomics and Lipidomics in Individuals with Pre-diabetes - a Pilot Study

Acronym: DGENE-NAFLD

Important dates

Study start
2023
Primary completion
2025
Study completion
2025
First posted
Jul 28, 2023
Registry last updated
Oct 9, 2024

OpenTrials presents study information sourced from ClinicalTrials.gov. The official registry record should be consulted for the latest information.

View the official ClinicalTrials.gov record (opens in a new tab)

This listing is for discovery and informational purposes only. It is not medical advice, does not guarantee that a study is recruiting, and does not determine eligibility. Contact the study team and a qualified healthcare professional when considering participation.

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