Excess dietary carbohydrate affects mitochondrial integrity as observed in brown adipose tissue

Althea N. Waldhart, Brejnev Muhire, Ben Johnson, Dean Pettinga, Zachary B. Madaj, Emily Wolfrum, Holly Dykstra, Vanessa Wegert, J. Andrew Pospisilik, Xianlin Han, Ning Wu

Research output: Contribution to journalArticlepeer-review

Abstract

Hyperglycemia affects over 400 million individuals worldwide. The detrimental health effects are well studied at the tissue level, but the in vivo effects at the organelle level are poorly understood. To establish such an in vivo model, we used mice lacking TXNIP, a negative regulator of glucose uptake. Examining mitochondrial function in brown adipose tissue, we find that TXNIP KO mice have a lower content of polyunsaturated fatty acids (PUFAs) in their membrane lipids, which affects mitochondrial integrity and electron transport chain efficiency and ultimately results in lower mitochondrial heat output. This phenotype can be rescued by a ketogenic diet, confirming the usefulness of this model and highlighting one facet of early cellular damage caused by excess glucose influx.

Original languageEnglish (US)
Article number109488
JournalCell Reports
Volume36
Issue number5
DOIs
StatePublished - Aug 3 2021

Keywords

  • BAT
  • cold stress
  • glucose
  • ketogenic diet
  • lipid
  • mitochondria
  • PUFA
  • TXNIP

ASJC Scopus subject areas

  • Biochemistry, Genetics and Molecular Biology(all)

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