SLU-PP-332: ERR Agonist Research Compound Overview

Estrogen-related receptors (ERRs) are a subfamily of nuclear receptors that share sequence similarity with the estrogen receptors but are not regulated by estrogen. The three ERR subtypes (ERRα, ERRβ, ERRγ) are orphan receptors — they have no known high-affinity natural ligand — though synthetic agonists and inverse agonists have been developed as research tools.^[1]

ERRs regulate transcription of genes involved in oxidative phosphorylation, mitochondrial biogenesis, and oxidative metabolism. Their function in skeletal muscle, brown adipose tissue, and cardiac tissue makes them research interest targets for metabolic and exercise-mimetic signaling research.^[2]

SLU-PP-332 was characterized as a pan-ERR agonist by Burris and colleagues at Saint Louis University in 2022-2023 research, hence the SLU naming. The compound is a relatively recent addition to the research toolset for ERR-mediated signaling.^[3]

SLU-PP-332 is studied as a research reference compound. It has not been approved by the FDA for any human therapeutic or medical purpose.

SLU-PP-332 is a small organic molecule:

• Structural class: synthetic small molecule (non-peptide)

• Form: supplied in capsule form for research applications

• Target: pan-agonist at ERRα, ERRβ, ERRγ

Unlike subtype-selective ERR ligands, SLU-PP-332 was developed as a pan-agonist — engaging all three ERR subtypes. This profile is useful in research because the three ERR subtypes have overlapping but distinct tissue distributions, and a pan-agonist allows researchers to broadly activate ERR signaling rather than targeting one subtype.^[3]

SLU-PP-332's research-characterized activity is at the ERR nuclear receptors.

ERRs function as transcription factors. Agonist binding stabilizes a receptor conformation that recruits coactivators (PGC-1α is the canonical ERR coactivator), and the receptor-coactivator complex binds DNA at ERR response elements (ERREs) to drive target gene transcription.^[2]

ERR-PGC-1α-mediated transcription is a central node in mitochondrial biogenesis. Genes encoding mitochondrial enzymes, electron transport chain components, and fatty acid oxidation machinery are typical ERR targets. SLU-PP-332 administration in preclinical models has been associated with increased transcription of these gene sets.^[3]

Physical exercise activates PGC-1α-ERR signaling endogenously, making ERR agonists like SLU-PP-332 a research tool for studying 'exercise mimetic' signaling pathways. Comparative studies pairing SLU-PP-332 with exercise interventions in animal models address whether the pathway can be activated pharmacologically without exercise.^[4]

SLU-PP-332 research is recent but rapidly growing.

Cell culture systems (myoblasts, hepatocytes) and rodent models examining mitochondrial DNA copy number, electron transport chain protein expression, and oxygen consumption have used SLU-PP-332 as a tool compound.^[3]

Mouse skeletal muscle preparations and exercise-related preclinical models have included SLU-PP-332 in experimental arms examining oxidative metabolism markers and muscle fiber type distribution.^[4]

BAT is highly oxidative and relies on PGC-1α-ERR signaling for its specialized thermogenic function. Preclinical studies have examined SLU-PP-332 effects in BAT preparations and in cold-exposed rodent models.^[5]

SLU-PP-332 is a small molecule with standard organic compound handling characteristics.

Supplied in capsule form (60-count, 1mg per capsule). Storage at room temperature in a cool, dry place is sufficient for encapsulated material.

HPLC for purity, mass spectrometry for identity confirmation, and trace impurity analysis. Each batch of Instant Peptides SLU-PP-332 ships with a full Certificate of Analysis.

Instant Peptides supplies SLU-PP-332 in 1mg capsules (60-count bottle) as a research reference compound. Material is supplied to qualified research professionals. Not for human or animal consumption.

View the product page for current pricing and the Certificate of Analysis for the active batch.