Search for Bovine miRNA Transference to Humans

November 13, 2018 updated by: Cristina Rodriguez-Padilla, Universidad Autonoma de Nuevo Leon

Search for the Transfer of Bovine miRNA to Humans by Comparing the Omnivore Group With a Vegan Group After a Dietary Intervention

Background: Foods derived from plants and animals contain miRNAs, and, some reports have detected diet-derived miRNAs circulating in mammalian serum. It is still unclear if the miRNAs present in food can be absorbed by the gastrointestinal tract and brought to the tissues to perform regulatory functions. The transfer of functional exogenous miRNA has been demonstrated in bacterial and viral infections but it is less well characterized in mammals. Edible bovine tissues contain unique profiles of human-homologous miRNAs that withstand cooking. If miRNAs from other species can cross the gastrointestinal barrier, it could have implications in gene regulation and health.

Objective: Determine whether miRNAs from beef cross the gastrointestinal barrier and are transferred to human plasma.

Methods: The investigators obtained fasting plasma from 29 healthy subjects divided in two groups: the omnivore group (6 men, 8 women) and the vegan group (8 men, 7 women; control group). Each participant was given a standard meal with or without beef depending on their group, then the plasma was collected at 2, 4 and 6 hours after the meal. The changes in the levels of of miR-1, miR-10b, miR-22, miR-92 and miR-192 were analysed by quantitative Polymerase Chain Reaction (qPCR).

Study Overview

Status

Completed

Conditions

Intervention / Treatment

Detailed Description

Diet plays an important role in both health and disease processes; the study of the influence of diet on the expression and regulation of genes will allow a greater understanding of the relationship between diet and health. One of the most studied gene regulation mechanisms at present is that of microRNAs (miRNAs). miRNAs are small noncoding RNA (approximately ~22 nucleotides) that regulate gene expression at the post-transcriptional level and influence processes such as development, homeostasis, immune response, metabolism and epigenetic processes. miRNAs bind to specific sequences in target mRNA transcripts to repress translation or induce mRNA degradation. miRNAs are stably present in different biofluids and some can be directly taken up by recipient cells for control of gene expression and cellular functions.

The transfer of functional exogenous RNA has been demonstrated in bacterial and viral infections but it is less well characterized in mammals. Foods derived from plants and animals contain miRNAs, and, some reports have detected diet-derived miRNAs circulating in mammalian serum. These findings support cross-kingdom transfer of specific miRNAs to mammalian tissue after food consumption. However, it's still unclear if miRNAs present in food derived from plants and animals can be absorbed by the gastrointestinal tract and brought to the tissues to perform regulatory functions for the cross regulation of gene expression between species. Delivering functional miRNAs from diet-derived sources across the gastrointestinal barrier could be relevant for nutrition, agriculture, human health and could have many potential applications in therapeutic targeting. In light of the controversial findings on diet-derived miRNAs, the question must be examined to determine the transfer of functional exogenous miRNA in mammals. The investigators studied the possible transfer of diet-derived miRNAs from animal tissue to human plasma because beef is an important diet component in Northeastern Mexico, and its consumption has been associated as a potential risk factor for different pathologies, including colorectal cancer.

Methods Study participants: The protocol was approved by an ethical committee. Thirty volunteers, fifteen omnivorous and fifteen vegans (control group), were enrolled in the study. One omnivore subject did not complete the trial. Written informed consent was obtained from all participants prior to enrollment in the study. To verify the health status of the participants, anthropometric measures, hematic biometry and serum chemistry were performed.

Inclusion and exclusion criteria: Healthy volunteers ages 18 to 30 years, able to provide informed consent, with similar anthropometric characteristics were recruited. The participants were divided in two groups: omnivorous and vegan (control). Inclusion criteria for omnivorous subjects was that they should consume beef at least three times per week. The inclusion criteria for vegan subjects was that they should have followed a strict vegan diet for at least one year. Exclusion criteria for all subjects included pregnancy, menstruation during study sample collection, use of medicine or food supplements, intestinal malabsorption and intolerance to ingredients included in the diet intervention.

Study procedure: Baseline blood samples were obtained after 12 hours overnight fast; the postprandial miRNA state was measured after intake of a meal with beef (test meal) that consisted of 200 g roast beef with salad (lettuce, tomato, lentils) and a cup of rice. The control diet consisted of the same intervention, without the roast beef. Each intervention day the meals were prepared with fresh food. Participants ate meals under control of the study staff. Postprandial samples were collected at 2, 4 and 6 hours after the diet intervention. The subjects did not eat or drink again until the end of sample collection.

Human plasma blood samples were collected into vacuum tubes containing EDTA; approximately 5 mL of blood was collected according to standard procedures at each time point (0, 2, 4 and 6 hours). Plasma was separated by centrifugation for 15 minutes at 2,000 × g at room temperature followed by freezing at -80 °C until analyses were performed.

RNAs isolation: Plasma RNA extraction: thawed plasma samples were centrifuged and plasma supernatant (200 µL) was used for purifying total RNA including small RNAs; RNA extraction was carried out using the miRNeasy Serum/Plasma Kit (Qiagen) according to the manufacturer's instructions.

Beef RNA extraction: Total RNA including small RNAs was extracted from raw and cooked beef using miRNeasy Mini Kit (Qiagen) following the manufacturer's instructions. Samples of 50 mg flash-frozen raw or cooked beef were placed into 700µL lysis reagent for disruption and homogenization immediately using the PRO200 homogenizer (PRO Scientific). The RNA was eluted in 30 µl RNase-free water. Quantity and purity were determined using a Nanodrop ND-1000.

qRT-PCR assay: The quantification of the miRNAs 1, 10b, 22, 92a and 192 was performed as shown: 4 µL of total RNA were used as a template for miRNA reverse transcription. Reverse transcription was performed using the Universal cDNA synthesis kit, (Exiqon): 0.5 µL of synthetic miRNA SPIKE (UniSp6) was added to each sample for normalization of miRNA plasma levels. Real-time qPCR was performed by using the ExiLENT SYBR® Green PCR Master Mix and primers miRCURY LNA Universal RT microRNA PCR, (Exiqon) for hsa-miR-1-3p, hsa-miR-10b-5p, hsa-miR-22-3p, hsa-miR-192-5p and hsa-miR-92a-3p. The PCR program and the dissociation curve analysis were carried out in a LightCycler Nano thermal cycler (Roche) under the conditions described by the manufacturer.

The relative quantification method was validated and the miRNA quantification in the omnivore group was carried out using the method 2-ΔΔCt, the normalizer used was the Spike in UniSp6 and the calibrator was the average value ΔCt of the control group at each time point (0, 2, 4 and 6 hours). Spike in UniSp6 was used as normalizer because of the lack of endogenous controls established for normalization in serum and plasma samples. Each sample was analyzed in triplicate including the Spike in UniSp6 and the negative controls. Data was obtained data for the quantitative miRNA detection in plasma after a meal with beef compared with the control group (vegan meal).

Data analysis: The miRNAs normal distribution was determined by the Kolmogorov-Smirnov test. Descriptive statistics were performed with the 2-ΔΔCt values of both study groups at each collection times (0, 2, 4 and 6 h). miRNAs differential detection between the omnivore and the control group was evaluated by t-student test at different postprandial time points was compared to fasting detection using the ANOVA test. Pearson correlations were performed to associate the miRNAs levels with a control or omnivorous diet. The analysis was done with the use of IBM SPSS Statistics 20 and differences were considered significant if p <0.05.

Study Type

Interventional

Enrollment (Actual)

29

Phase

  • Not Applicable

Contacts and Locations

This section provides the contact details for those conducting the study, and information on where this study is being conducted.

Study Locations

  • Mexico
    • Nuevo Leon
      • Monterrey, Nuevo Leon, Mexico, 66455
        • Cristina Rodriguez-Padilla

Participation Criteria

Researchers look for people who fit a certain description, called eligibility criteria. Some examples of these criteria are a person's general health condition or prior treatments.

Eligibility Criteria

Ages Eligible for Study

18 years to 30 years (Adult)

Accepts Healthy Volunteers

Yes

Genders Eligible for Study

All

Description

Inclusion Criteria:

  • For omnivorous subjects was that they should consume beef at least three times per week.
  • For vegan subjects was that they should have followed a strict vegan diet for at least one year

Exclusion Criteria:

  • For all subjects included pregnancy, menstruation during study sample collection, use of medicine or food supplements, intestinal malabsorption and intolerance to ingredients included in the diet intervention.

Study Plan

This section provides details of the study plan, including how the study is designed and what the study is measuring.

How is the study designed?

Design Details

  • Primary Purpose: Basic Science
  • Allocation: Non-Randomized
  • Interventional Model: Parallel Assignment
  • Masking: None (Open Label)

Arms and Interventions

Participant Group / Arm
Intervention / Treatment
Experimental: Omnivorous diet
This group was assigned a meal containing beef (test meal) that consisted of 200 g roast beef with salad (lettuce, tomato, lentils) and a cup of rice.
Other: Omnivorous diet
Determine if the transfer of bovine miRNAs is carried out after a meal containing beef.
Active Comparator: Vegan diet
This group was assigned a control meal consisted of salad (lettuce, tomato, lentils) and a cup of rice.
Other: Vegan diet
Used as a baseline for miRNA levels in blood

What is the study measuring?

Primary Outcome Measures

Outcome Measure
Measure Description
Time Frame
Relative amount of miR-1, miR-10b, miR-22, miR-92 and miR-192 in plasma
Time Frame: Change from Baseline microRNA levels at 2, 4 and 6 hours after intervention
Quantification of miR-1, miR-10b, miR-22, miR-92 and miR-192 in plasma after meal time
Change from Baseline microRNA levels at 2, 4 and 6 hours after intervention

Collaborators and Investigators

This is where you will find people and organizations involved with this study.

Sponsor

Universidad Autonoma de Nuevo Leon

Investigators

  • Principal Investigator: Fermín Mar-Aguilar, Dr., Universidad Autonoma de Nuevo Leon

Publications and helpful links

The person responsible for entering information about the study voluntarily provides these publications. These may be about anything related to the study.

General Publications

Helpful Links

Study record dates

These dates track the progress of study record and summary results submissions to ClinicalTrials.gov. Study records and reported results are reviewed by the National Library of Medicine (NLM) to make sure they meet specific quality control standards before being posted on the public website.

Study Major Dates

Study Start (Actual)

April 13, 2015

Primary Completion (Actual)

November 16, 2015

Study Completion (Actual)

May 22, 2016

Study Registration Dates

First Submitted

November 6, 2018

First Submitted That Met QC Criteria

November 9, 2018

First Posted (Actual)

November 14, 2018

Study Record Updates

Last Update Posted (Actual)

November 15, 2018

Last Update Submitted That Met QC Criteria

November 13, 2018

Last Verified

November 1, 2018

More Information

Terms related to this study

Keywords

Other Study ID Numbers

  • Bovine miRNA assay FCB

Plan for Individual participant data (IPD)

Plan to Share Individual Participant Data (IPD)?

NO

Drug and device information, study documents

Studies a U.S. FDA-regulated drug product

No

Studies a U.S. FDA-regulated device product

No

This information was retrieved directly from the website clinicaltrials.gov without any changes. If you have any requests to change, remove or update your study details, please contact register@clinicaltrials.gov. As soon as a change is implemented on clinicaltrials.gov, this will be updated automatically on our website as well.

Clinical Trials on Vegan Diet

Clinical Trials on Omnivorous diet

Search Similar Trials

Sponsors and Collaborators

Medical Conditions

Drug Interventions

CROs by country

CROs in Bahamas

Conditions

Rare Diseases

Drug Interventions

Dietary Supplements

Sponsor/Collaborators

Locations

3
Subscribe