Alpha & Omega Peptide
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SLU‑PP‑332: An ERR that Reprograms Muscle Fuel Use

2 min read

Abstract:

By activating ERRs, SLU‑PP‑332 binds to ERRs that turn on a PGC‑1α–linked gene program. In mouse models, this program is studied for its effects on mitochondrial gene expression and fuel selection.

 

Step‑by‑step mechanism

  1. Direct receptor activation: SLU‑PP‑332 binds ERRs (non‑selectively across α/β/γ), with multiple lines of evidence showing functional ERRα dependence for the exercise phenotype in mice.

  2. Coactivator recruitment: Activated ERRs recruit PGC‑1α (a transcriptional coactivator of mitochondrial biogenesis genes).

  3. Gene program engagement: SLU‑PP‑332 induces an acute aerobic exercise gene signature in mouse skeletal muscle, including Pdk4. Pdk4 (pyruvate dehydrogenase kinase 4) is an enzyme that inhibits the pyruvate dehydrogenase complex, the gatekeeping enzyme that channels glucose-derived pyruvate into mitochondria.

  4. Cellular remodeling. Mouse studies report changes in oxidative type IIa fiber proportion, mitochondrial content, and expression of respiratory chain components.

Checkpoint

  • Respiratory exchange ratio (RER): a breath‑level metric; lower RER indicates greater fatty acid use as fuel.
  • Fatty acid oxidation: the breakdown of fatty acids inside mitochondria.

What the animal studies measured

  • Fuel selection & energy expenditure: In mice, RER, fatty acid oxidation, and energy expenditure were measured after administration.

  • Body composition on high‑fat diet: In diet‑induced obese mice, body‑composition endpoints (fat mass and lean mass) were measured over 28 days; see the works cited for the published data.

  • Glycemic readouts: In high‑fat diet models, glucose tolerance was measured; in chow‑fed mice, fasting/fed glucose and insulin were largely unchanged—highlighting context‑dependent effects.

  • Treadmill models: In independent work, SLU‑PP‑332 was studied in mouse treadmill models measuring time to exhaustion and running distance.

Research takeaway (early‑stage):

The mechanism overlaps with gene programs engaged by aerobic exercise in mice—but all data so far are preclinical (animal models). No human data exist, and SLU‑PP‑332 is not for human use.

Works cited

https://pmc.ncbi.nlm.nih.gov/articles/PMC11584170/

https://pmc.ncbi.nlm.nih.gov/articles/PMC10801787/

https://news.ufl.edu/2023/09/exercise-mimicking-drug/

https://pmc.ncbi.nlm.nih.gov/articles/PMC10215733/

 

 

“For education only; not medical advice; SLU‑PP‑332 is an investigational research compound with no human approval.”