Rnf20 deficiency in adipocyte impairs adipose tissue development and thermogenesis

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Xiaojuan Liang1, Cong Tao1, Jianfei Pan1

  • 1State Key Laboratory of Animal Nutrition, Institute of Animal Science, Chinese Academy of Agricultural Sciences, Beijing, 100193, China.

Protein & Cell
|August 16, 2020
PubMed

Insights

RNF20 is crucial for fat development. Its removal in mice caused fat loss, metabolic issues, and impaired brown fat function, highlighting RNF20

Area of Science:

  • Biochemistry
  • Molecular Biology
  • Metabolic Research

Background:

  • RNF20 (Ring Finger Protein 20) is an E3 ligase essential for histone H2B monoubiquitination (H2Bub).
  • Its specific functions in adipocytes (fat cells) are not well understood.
  • Histone modifications play key roles in gene regulation within metabolic tissues.

Purpose of the Study:

  • To investigate the physiological roles of RNF20 in adipocytes.
  • To determine the impact of adipocyte-specific RNF20 knockout (ASKO) on adipose tissue development and function.
  • To explore the molecular mechanisms underlying RNF20's effects on adipogenesis and metabolic homeostasis.

Main Methods:

  • Generation of adipocyte-specific Rnf20 knockout (ASKO) mice.
  • Analysis of metabolic parameters, including glucose tolerance, insulin sensitivity, and body composition.
  • Assessment of white adipose tissue (gWAT) and brown adipose tissue (BAT) characteristics, gene expression, and mitochondrial function.
  • Pharmacological intervention with rosiglitazone.

Main Results:

  • ASKO mice exhibited progressive fat loss, organomegaly, and hyperinsulinemia.
  • Despite hyperinsulinemia, ASKO mice showed normal insulin sensitivity and improved glucose tolerance under standard conditions.
  • High-fat diet feeding led to severe liver steatosis in ASKO mice.
  • ASKO mice displayed cold sensitivity due to reduced BAT gene expression (e.g., Ucp1) and impaired mitochondrial function.
  • Decreased peroxisome proliferator-activated receptor gamma (Pparγ) levels were observed in ASKO gWAT.
  • Rosiglitazone treatment partially rescued fat mass in ASKO mice.

Conclusions:

  • RNF20 plays a critical role in regulating both white and brown adipose tissue development and function.
  • RNF20 influences adipogenesis, potentially through the Pparγ pathway.
  • Dysregulation of RNF20 in adipocytes leads to complex metabolic phenotypes, including altered fat storage and thermogenesis.
  • RNF20 is a potential therapeutic target for metabolic disorders affecting adipose tissue.
Keywords:
RNF20adipose tissue developmentfat lossthermogenesis

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