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Related Concept Videos

Lipid Catabolism01:25

Lipid Catabolism

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Triglycerides serve as crucial long-term energy storage molecules in microorganisms, providing a dense source of metabolic energy. Their breakdown is mediated by lipases, which hydrolyze triglycerides into glycerol and free fatty acids. Each of these components follows distinct metabolic pathways, ultimately contributing to ATP synthesis and cellular energy homeostasis.Glycerol MetabolismGlycerol, released from triglyceride hydrolysis, is phosphorylated by glycerol kinase to form...
841

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SCD-Mediated Oleic Acid-PPARγ Self-Reinforcing Loop Drives Porcine Intramuscular Fat Deposition.

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A novel feedback loop involving stearoyl-CoA desaturase (SCD) and oleic acid (OA) activates PPARγ, significantly boosting intramuscular fat (IMF) deposition and enhancing pork quality. This discovery explains variations in pork fat accumulation.

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Area of Science:

  • Animal Science
  • Molecular Biology
  • Biochemistry

Background:

  • Intramuscular fat (IMF) deposition is crucial for pork quality.
  • Peroxisome proliferator-activated receptor gamma (PPARγ) is a known regulator of adipogenesis.
  • PPARγ expression alone doesn't fully explain variations in IMF accumulation.

Purpose of the Study:

  • To identify novel regulatory mechanisms of IMF deposition.
  • To elucidate the role of stearoyl-CoA desaturase (SCD) and oleic acid (OA) in adipogenesis.
  • To explain breed-specific differences in pork quality.

Main Methods:

  • Multilayer omics integration (genomics, transcriptomics, metabolomics).
  • Functional assays in vitro and in vivo.
  • Analysis of SCD and PPARγ interactions and their downstream effects.

Main Results:

  • A positive feedback loop between SCD, oleic acid (OA), and PPARγ was identified.
  • SCD-derived OA acts as an endogenous ligand activating PPARγ.
  • PPARγ upregulates SCD expression, amplifying lipid metabolism and IMF deposition.
  • SCD overexpression and OA nanoparticle delivery increased IMF in vivo.

Conclusions:

  • The SCD-OA-PPARγ axis is a key driver of efficient IMF accumulation.
  • This feedback loop provides a molecular mechanism for breed-specific differences in pork quality.
  • Findings offer insights into optimizing pork production and quality.