Transcript profile of skeletal muscle lipid metabolism genes affected by diet in a piglet model of low birth weight

PLoS One. 2019 Oct 29;14(10):e0224484. doi: 10.1371/journal.pone.0224484. eCollection 2019.

Abstract

Dysregulated skeletal muscle metabolism (DSMM) is associated with increased inter- and intramuscular fat deposition in low birth weight (L) individuals. The mechanisms behind DSMM in L individuals are not completely understood but decreased muscle mass and shifts in lipid and carbohydrate utilisation may contribute. Previously, we observed lower fat oxidation in a porcine model of low birth weight. To elucidate the biological activities underpinning this difference microfluidic arrays were used to assess mRNA associated with lipid metabolism in longissimus dorsi (LD) and semitendinosus (ST) skeletal muscle samples from thirty-six female L and normal birth weight (N) pigs. Plasma samples were collected from a sub-population to measure metabolite concentrations. Following overnight fasting, skeletal muscle and plasma samples were collected and the association with birth weight, diet and age was assessed. Reduced dietary fat was associated with decreased LD intermuscular fat deposition and beta-oxidation associated mRNA, in both birth weight groups. Lipid uptake and intramuscular fat deposition associated mRNA was reduced in only L pigs. Abundance of ST mRNA associated with lipolysis, lipid synthesis and transport increased in both birth weight groups. Lipid uptake associated mRNA reduced in only L pigs. These changes were associated with decreased plasma L glucose and N triacylglycerol. Post-dietary fat reduction, LD mRNA associated with lipid synthesis and inter- and intramuscular fat deposition increased in L, whilst beta-oxidation associated mRNA remains elevated for longer in N. In the ST, mRNA associated with lipolysis and intramuscular fat deposition increased in both birth weight groups, however this increase was more significant in L pigs and associated with reduced beta-oxidation. Analysis of muscle lipid metabolism associated mRNA revealed that profile shifts are a consequence of birth weight. Whilst, many of the adaptions to diet and age appear to be similar in birth weight groups, the magnitude of response and individual changes underpin the previously observed lower fat oxidation in L pigs.

Publication types

  • Research Support, Non-U.S. Gov't

MeSH terms

  • Adipose Tissue / metabolism
  • Animals
  • Animals, Newborn
  • Birth Weight
  • Diet
  • Dietary Fats* / metabolism
  • Female
  • Lipid Metabolism* / genetics
  • Lipids / genetics
  • Lipids / physiology
  • Lipogenesis
  • Lipolysis
  • Male
  • Models, Animal
  • Muscle, Skeletal / metabolism
  • Oxidation-Reduction
  • RNA, Messenger / genetics
  • Sus scrofa / genetics
  • Transcriptome / genetics

Substances

  • Dietary Fats
  • Lipids
  • RNA, Messenger

Grants and funding

This research was funded by a grant of the German Federal Ministry of Education and Research (BMBF; https://www.bmbf.de/) in the framework of ‘Biomedizinische Ernährungsforschung’ (Vision Epifood, FKZ 0315397B to C.C.M.) and matched funding by the core budget of the Leibniz Institute for Farm Animal Biology, Dummerstorf, Germany (https://www.fbn-dummerstorf.de/). The funders had no role in study design, data collection and analysis, decision to publish, or preparation of the manuscript.