Impact of a Short-Term High Fat or Low Fat Diet on Intestinal Genes Expression Involved in the Cholesterol and Fatty Acid Metabolism

Gene Expression Clinical Trial

— DGENES  

Official title:

Impact of a Short-Term High Fat Diet Versus A Short-Term Low Fat Diet on Expression of the Key Intestinal Genes Involved in the Cholesterol and Fatty Acid Metabolism Pathways

Clinical Trial Details — Status: Completed

Administrative data

• NCT number: NCT01806441
• Other study ID #: INAF-125-05-06
• Status: Completed
• Phase: N/A
• First received: March 4, 2013
• Last updated: March 5, 2013
• Start date: February 2009
• Est. completion date: December 2010

Study information

• Verified date: March 2013
• Source: Laval University
• Contact: n/a
• Is FDA regulated: No
• Health authority: Canada: Health Canada
• Study type: Interventional

Clinical Trial Summary

Dietary fat has been shown to modulate cholesterol and fatty acids homeostasis and several lines of evidence suggest that this effect is associated with changes in the regulation of different genes at the intestine level involved in the cholesterol and fatty acid metabolism pathways. The present study will examine the impact of a short-term high fat diet versus a short-term low fat diet on expression of Niemann-Pick C1-like 1 (NPC1L1), adenosine triphosphate (ATP) binding cassette transporters (ABCG5/8), microsomal triglyceride transfer protein (MTP) and fatty acid transport protein-4 (FATP4), which have been shown to play a critical role in intestinal cholesterol absorption, chylomicron synthesis and dietary lipid absorption. Gene expression studies will be performed on duodenal biopsies. The primary hypothesis is that a short-term high fat diet will significantly decrease duodenal messenger ribonucleic acid (mRNA) levels of NPC1L1, ABCG5/8, MTP and FATP4 as compared with a short-term low fat diet.

Recruitment information / eligibility

• Status: Completed
• Enrollment: 12
• Est. completion date: December 2010
• Est. primary completion date: May 2009
• Accepts healthy volunteers: Accepts Healthy Volunteers
• Gender: Male
• Age group: 18 Years to 50 Years

Eligibility

Inclusion Criteria:

• Males 18 to 50 years of age

• Non-smoker

• Body mass index between 20.0 and 30.0 kg/m2

• Plasma LDL-cholesterol levels between the 25th and 75th percentile for their age at day -14

• Plasma triglyceride levels < 1.7 mmol/L (150 mg/dl) at day -14

• Plasma HDL-cholesterol levels between 0.9 (35 mg/dl) and 1.6 mmol/L (60 mg/dl) at day -14

• 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 elevations in hepatic transaminases or creatine kinase (CK) or 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.)

Study Design

Allocation: Randomized, Endpoint Classification: Efficacy Study, Intervention Model: Crossover Assignment, Masking: Double Blind (Subject, Caregiver, Outcomes Assessor), Primary Purpose: Prevention

Related Conditions & MeSH terms

• Gene Expression

Intervention

Other:
• 3-days high fat diet
During 3 days, subjects eat a diet high in fat (percent of total caloric intake: 15.0% from proteins; 49,8% from carbohydrates; 37.0% from fat).
• 3-days low fat diet
During 3 days, subjects eat a diet low in fat (percent of caloric intake: 15.0% from proteins; 61,8% from carbohydrates; 25.0% from fats).

Locations

Country	Name	City	State
Canada	Institute of nutrition and functional food	Quebec city	Quebec

Sponsors (1)

Lead Sponsor	Collaborator
Laval University

Country where clinical trial is conducted

Canada, 

Outcome

Type	Measure	Description	Time frame	Safety issue
Primary	Change in duodenal mRNA expression of NPC1L1, ABCG5/8, MTP and FATP4.	Six biopsies (3 X 3 mm) will be obtained from the second portion of the duodenum during gastro-duodenoscopy. Biopsy specimen will be stored at -86°C before mRNA extraction. Total RNA will be isolated and used for polymerase chain reaction (PCR) quantification.	At the end of the two 3-days diets (day 3 and day 17).	No
Secondary	Change in surrogate markers of cholesterol absorption and synthesis.		At the end of the two 3-days diets (day 3 and day 17).	No