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Retinaldehyde dehydrogenase 1 regulates a thermogenic program in white adipose tissue
Florian W Kiefer1, Cecile Vernochet, Patrick O'Brien
1Cardiovascular Division, Department of Medicine, Brigham and Women’s Hospital, Harvard Medical School, Boston, Massachusetts, USA.
Nature Medicine
|May 8, 2012
Summary
Aldehyde dehydrogenase 1 family member A1 (Aldh1a1) in white fat promotes obesity. Aldh1a1 deficiency or knockdown activates brown fat traits in white fat, aiding weight management and improving glucose levels.
Area of Science:
- Adipose tissue biology
- Metabolic regulation
- Endocrinology
Background:
- Brown adipose tissue (BAT) activation is a strategy to combat obesity.
- Retinoids influence energy balance, but their specific role in white versus brown fat metabolism is unclear.
- Retinaldehyde dehydrogenases (Aldhs) are key enzymes in retinoid metabolism.
Purpose of the Study:
- To investigate the role of Aldh1a1 in white adipose tissue (WAT) and its impact on energy homeostasis.
- To determine if Aldh1a1 regulates adaptive thermogenesis in WAT.
- To explore the therapeutic potential of targeting retinoid metabolism in obesity.
Main Methods:
- Analysis of Aldh1a1 expression in mouse and human WAT.
- Gene knockout and knockdown studies of Aldh1a1 in mice.
- Assessment of gene expression, respiration, and thermogenesis in adipocytes.
- Investigation of the retinoic acid receptor (RAR) and PGC-1α coactivator involvement.
Main Results:
- Aldh1a1 is predominantly expressed in WAT.
- Aldh1a1 deficiency induced a BAT-like transcriptional program in WAT, enhancing uncoupled respiration and thermogenesis.
- WAT-specific Aldh1a1 knockdown in obese mice reduced weight gain and improved glucose homeostasis.
- Retinaldehyde (Rald) activated Ucp1 expression in white adipocytes via RAR and PGC-1α.
Conclusions:
- Aldh1a1 and its substrate Rald are critical regulators of adipocyte plasticity and adaptive thermogenesis.
- Targeting Aldh1a1 in WAT presents a potential therapeutic strategy for obesity and metabolic dysfunction.
- These findings reveal a novel mechanism linking retinoid metabolism to energy expenditure in adipose tissue.
