Open Collections

UBC Faculty Research and Publications

Inflexibility of the plasma miRNA response following a high-carbohydrate meal in overweight insulin-resistant women Ramzan, F.; D’Souza, R. F; Durainayagam, B. R; Milan, A. M; Roy, N. C; Kruger, M. C; Henry, C. J; Mitchell, C. J; Cameron-Smith, D.

Abstract

Context: Metabolic inflexibility is a characteristic of insulin resistance, limiting the ability to transiently regulate oxidative metabolism and gene expression in response to nutrient availability. Little is known of the flexibility of post-transcriptional regulation, including circulatory miRNAs (c-miRNAs). Design: The abundances of targeted c-miRNAs, with reported functions in metabolic regulation, were analysed in response to a high-carbohydrate meal in healthy weight insulin-sensitive (IS) and overweight insulin-resistant (IR) women. Participants: Age-matched healthy weight IS (n = 20, BMI = 24.3 ± 0.70) and overweight IR (n = 20, BMI = 28.6 ± 0.67) women. Methods: An abundance of c-miRNAs was quantified prior to and following a high-carbohydrate breakfast meal (2500 kJ; 50% carbohydrate, 20% fat and 27% protein). Target genes of the differentially regulated c-miRNA were measured in RNA extracted from circulatory peripheral blood mononuclear cells (PBMCs). Results: In healthy weight IS women, both miR-15a-5p (p = 0.03) and miR-17-5p (p < 0.01) levels were halved at 4 h post-meal. These miRNA remained unaltered following the same meal in the overweight IR women. Furthermore, amongst genes targeted by these miRNA, CPT1A (p = 0.01) and IL8 (p = 0.03) had also reduced expression 4 h post-meal only in the healthy weight IS women. Conclusions: The study findings provide preliminary evidence for a possible extension of metabolic inflexibility to include c-miRNAs. Trial registration: The clinical trial is registered with Australian New Zealand Clinical Trials Registry under Trial registration: ANZCTR: ACTRN12615001108505. Registered on 21 October 2015.

Item Metadata

Title
Inflexibility of the plasma miRNA response following a high-carbohydrate meal in overweight insulin-resistant women
Creator
Ramzan, F.; D’Souza, R. F; Durainayagam, B. R; Milan, A. M; Roy, N. C; Kruger, M. C; Henry, C. J; Mitchell, C. J; Cameron-Smith, D.
Publisher
BioMed Central
Date Issued
2020-02-04
Description
Context: Metabolic inflexibility is a characteristic of insulin resistance, limiting the ability to transiently regulate oxidative metabolism and gene expression in response to nutrient availability. Little is known of the flexibility of post-transcriptional regulation, including circulatory miRNAs (c-miRNAs). Design: The abundances of targeted c-miRNAs, with reported functions in metabolic regulation, were analysed in response to a high-carbohydrate meal in healthy weight insulin-sensitive (IS) and overweight insulin-resistant (IR) women. Participants: Age-matched healthy weight IS (n = 20, BMI = 24.3 ± 0.70) and overweight IR (n = 20, BMI = 28.6 ± 0.67) women. Methods: An abundance of c-miRNAs was quantified prior to and following a high-carbohydrate breakfast meal (2500 kJ; 50% carbohydrate, 20% fat and 27% protein). Target genes of the differentially regulated c-miRNA were measured in RNA extracted from circulatory peripheral blood mononuclear cells (PBMCs). Results: In healthy weight IS women, both miR-15a-5p (p = 0.03) and miR-17-5p (p < 0.01) levels were halved at 4 h post-meal. These miRNA remained unaltered following the same meal in the overweight IR women. Furthermore, amongst genes targeted by these miRNA, CPT1A (p = 0.01) and IL8 (p = 0.03) had also reduced expression 4 h post-meal only in the healthy weight IS women. Conclusions: The study findings provide preliminary evidence for a possible extension of metabolic inflexibility to include c-miRNAs. Trial registration: The clinical trial is registered with Australian New Zealand Clinical Trials Registry under Trial registration: ANZCTR: ACTRN12615001108505. Registered on 21 October 2015.
Subject
Metabolic inflexibility; Noncoding-RNA; PBMCs; Substrate switching; Gene expression
Genre
Article
Type
Text
Language
eng
Date Available
2020-02-06
Provider
Vancouver : University of British Columbia Library
Rights
Attribution 4.0 International (CC BY 4.0)
DOI
10.14288/1.0388577
URI
http://hdl.handle.net/2429/73489
Affiliation
Education, Faculty of; Non UBC; Kinesiology, School of
Citation
Genes & Nutrition. 2020 Feb 04;15(1):2
Publisher DOI
10.1186/s12263-020-0660-8
Peer Review Status
Reviewed
Scholarly Level
Faculty
Copyright Holder
The Author(s)
Rights URI
http://creativecommons.org/licenses/by/4.0/
Aggregated Source Repository
DSpace

Item Media

Item Citations and Data

Rights

Attribution 4.0 International (CC BY 4.0)