There are 2 clinical trials
The primary aim of this study is to determine whether the cholesterol-lowering efficacy of barley b- glucan varied as function of molecular weight (MW) and the total daily amount consumed. Our second aim is to investigate the mechanism responsible for the action, specifically, whether β-glucan lowers circulating cholesterol concentration via inhibiting cholesterol absorption and synthesis. Thirdly, we aim to determine if any gene-diet interactions are associated with cholesterol lowering by barley β-glucan. In addition, we aim to investigate the alteration of the gut microbiota after β-glucan consumption and the correlation between the altered gut microbiota and cardiovascular disease risk factors.
The Single Nucleotide Polymorphism (SNP) rs3808607 of CYP7A1 gene, rs429358 and rs7412 of APOE gene, and their associations with different blood lipid responses to beta-glucan interventions will be determined.. Changes in Body Weight and Waist Circumference(WC).
Single nucleotide polymorphisms (SNPs), rs3808607 of gene CYP7A1and rs429358 and rs7412 will be determined byTaqMan® SNP Genotyping assay following the manufacturer's protocol.
Description: Fasted total cholesterol concentration will be measured using the automated enzymatic methods.
Measure: Changs in Total Cholesterol Time: Beginning and end of each phaseDescription: Serum LDL cholesterol will be estimated using the Friedewald equation.
Measure: Changes in LDL Cholesterol Time: Beginning and end of each phaseDescription: The rate of cholesterol absorption and synthesis will be measured in each intervention phase using single stable isotope labelling technique.
Measure: Cholesterol Absorption/Synthesis Time: End of each phaseDescription: The Single Nucleotide Polymorphism (SNP) rs3808607 of CYP7A1 gene, rs429358 and rs7412 of APOE gene, and their associations with different blood lipid responses to beta-glucan interventions will be determined.
Measure: Potential Gene-nutrient Interactions: CYP7A1 and APOE Time: Once for each participantDescription: Body weight will be monitored every day when subject visits the Richardson Centre. Waist circumference will be measured at the beginning and end of each study phase.
Measure: Changes in Body Weight and Waist Circumference(WC) Time: Every day for body weight; beginning and end of each phase for WCThe objective of this study is to utilize information on associations between genetic predisposition pertaining to multiple single nucleotide polymorphisms (SNPs) and the degree of responsiveness of low-density lipoprotein cholesterol (LDL-C) lowering to plant sterols (PS). The predictive potential of SNPs associated with PS responsiveness will be evaluated using a randomized human intervention trial examining responsiveness of lowering blood LDL-C levels to PS intervention.
The change in deuterium enrichment within red blood cell (RBC) free cholesterol we be determined as an index of synthesis over days 28 and 29.. Inclusion Criteria: - Fasting LDL-C concentration >3.0 and <4.9 mmol/L - Fasting glucose concentration <6.1 mmol/L - Fasting triglyceride concentration <4.52 mmol/L - Genoset required: ; ApoE ε3/ε3 CYP7A1 rs3808607 T/T (n=20); ApoE ε3/ε3 CYP7A1 rs3808607 G/- (n=22); ApoE ε4/- CYP7A1 rs3808607 -/- (n=22) Exclusion Criteria: - Consuming, or have consumed in the last 3 months, medications or nutritional supplements which are known to affect lipid metabolism (such as cholestyramine, colestipol, niacin, clofibrate, gemfibrozil, probucol, HMG-CoA R inhibitors, methotrexate, high dose dietary supplements, fish oil capsules or plant sterol or stanol), or have any dietary restrictions which would prevent them from consuming the trial treatments - BMI >40 - Must not have self-reported weight gain or loss greater than 3 kg in the past three months - Phytosterolemic - History of active cardiovascular disease including stroke, congestive heart failure, myocardial infarction, unstable angina pectoris, coronary artery bypass graft, percutaneous transluminal coronary angioplasty, temporal ischemic attacks, anemia, abnormal electrolytes, proteinuria, and abnormal liver, kidney or thyroid function - Type 1 or type 2 diabetes, a history of cancer or malignancy in the last 5 years, or any metabolic disease, gastrointestinal disorder or other clinically significant disease/disorder which could interfere with the results of the study or the safety of the participant.
- Uncontrolled hypertension having systolic blood pressure >160mm Hg or diastolic blood pressure >100mm Hg - Smoker, tobacco/snuff/nicotine users, recreational drug users - Consume more than 14 alcoholic beverages a week - Participants who are pregnant or plan to become pregnant during the trial period or lactating mothers - Participants will be excluded if they have clinically significant biochemistry defined as: LDL-C <3.0mmol/L or >4.9 mmol/L; TC > 6.2 mmol/L; fasting glucose: > 6.1 mmol/ l, fasting TG >4.52 mmol/L; AST >100 U/L; ALT >100 U/L or or any other clinically significant abnormality in hematology and/or biochemistry at the investigator's discretion - Patients with unstable or serious illness, for example, dementia, terminal illness, recent bereavement, recent significant medical diagnosis will also be excluded Inclusion Criteria: - Fasting LDL-C concentration >3.0 and <4.9 mmol/L - Fasting glucose concentration <6.1 mmol/L - Fasting triglyceride concentration <4.52 mmol/L - Genoset required: ; ApoE ε3/ε3 CYP7A1 rs3808607 T/T (n=20); ApoE ε3/ε3 CYP7A1 rs3808607 G/- (n=22); ApoE ε4/- CYP7A1 rs3808607 -/- (n=22) Exclusion Criteria: - Consuming, or have consumed in the last 3 months, medications or nutritional supplements which are known to affect lipid metabolism (such as cholestyramine, colestipol, niacin, clofibrate, gemfibrozil, probucol, HMG-CoA R inhibitors, methotrexate, high dose dietary supplements, fish oil capsules or plant sterol or stanol), or have any dietary restrictions which would prevent them from consuming the trial treatments - BMI >40 - Must not have self-reported weight gain or loss greater than 3 kg in the past three months - Phytosterolemic - History of active cardiovascular disease including stroke, congestive heart failure, myocardial infarction, unstable angina pectoris, coronary artery bypass graft, percutaneous transluminal coronary angioplasty, temporal ischemic attacks, anemia, abnormal electrolytes, proteinuria, and abnormal liver, kidney or thyroid function - Type 1 or type 2 diabetes, a history of cancer or malignancy in the last 5 years, or any metabolic disease, gastrointestinal disorder or other clinically significant disease/disorder which could interfere with the results of the study or the safety of the participant.
Description: Pulse wave velocity will be determined using an automated oscillometric measurement device (Mobil-O-Graph, IEM, Stolberg, Germany).
Measure: Change in arterial stiffness-Pulse wave velocity between placebo and treatment endpoints (in a crossover design) Time: Endpoint (Days 28,29) of each treatment periodDescription: Augmentation index will be determined using an automated oscillometric measurement device (Mobil-O-Graph, IEM, Stolberg, Germany).
Measure: Change in arterial stiffness-augmentation index between placebo and treatment endpoints (in a crossover design) Time: Endpoint (Days 28,29) of each treatment periodDescription: A fasted blood sample will be taken on day 28 of each study period prior to deuterium oxide administration, as well as fasting samples on day 29. The change in deuterium enrichment within red blood cell (RBC) free cholesterol we be determined as an index of synthesis over days 28 and 29.
Measure: Change in fractional cholesterol synthesis between placebo and treatment endpoints (in a crossover design) Time: Endpoint (Day 28,29) of each treatment period