PI3Ka-Akt1-mediated Prdm4 induction in adipose tissue increases energy expenditure, inhibits weight gain, and improves insulin resistance in diet-induced obese mice

No Joon Song, Seo Hyuk Chang, Suji Kim, Vanja Panic, Byung Hyun Jang, Ui Jeong Yun, Jin Hee Choi, Zhen Li, Ki Moon Park, Jung Hoon Yoon, Sunghwan Kim, Jae Hyuk Yoo, Jing Ling, Kirk Thomas, Claudio J. Villanueva, Dean Y. Li, Jee Yin Ahn, Jin Mo Ku, Kye Won Park

Research output: Contribution to journalArticlepeer-review

12 Scopus citations

Abstract

Stimulation of white adipose tissue (WAT) browning is considered as a potential approach to treat obesity and metabolic diseases. Our previous studies have shown that phytochemical butein can stimulate WAT browning through induction of Prdm4 in adipocytes. Here, we investigated the effects of butein on diet-induced obesity and its underlying molecular mechanism. Treatment with butein prevented weight gains and improved metabolic profiles in diet-induced obese mice. Butein treatment groups also displayed higher body temperature, increased energy expenditure, and enhanced expression of thermogenic genes in adipose tissue. Butein also suppressed body weight gains and improved glucose and insulin tolerance in mice housed at thermoneutrality (30 °C). These effects were associated with adipose-selective induction of Prdm4, suggesting the role of Prdm4 in butein-mediated anti-obese effects. To directly assess the in vivo role of Prdm4, we generated aP2-Prdm4 transgenic mouse lines overexpressing Prdm4 in adipose tissues. Adipose-specific transgenic expression of Prdm4 recapitulated the butein’s actions in stimulating energy expenditure, cold tolerance, and thermogenic gene expression, resulting in prevention of obesity and improvement of metabolism. Mechanistically, direct inhibition of PI3Kα activity followed by selective suppression of its downstream Akt1 mirrored butein’s effect on Ucp1 expression and oxygen consumption. In addition, effects of butein were completely abolished in Akt1 KO mouse embryonic fibroblasts. Together, these studies demonstrate the role of butein in obesity and metabolic diseases, further highlighting that adipose PI3Kα–Akt1–Prdm4 axis is a regulator of energy expenditure.

Original languageEnglish (US)
Article number876
JournalCell Death and Disease
Volume9
Issue number9
DOIs
StatePublished - Sep 1 2018
Externally publishedYes

ASJC Scopus subject areas

  • Immunology
  • Cellular and Molecular Neuroscience
  • Cell Biology
  • Cancer Research

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