SLU-PP-332 Research Peptide Overview

SLU-PP-332 is a synthetic small molecule agonist of estrogen-related receptors alpha and gamma (ERRα/γ), nuclear receptors that regulate mitochondrial biogenesis, fatty acid oxidation, and oxidative muscle fiber gene programs. This research compound is studied as an exercise-mimetic agent in preclinical models examining how ERR activation reproduces metabolic adaptations typically associated with endurance exercise training.

What Is SLU-PP-332?

SLU-PP-332 was developed by researchers at Saint Louis University as part of efforts to identify pharmacological activators of exercise-responsive metabolic pathways. ERRα and ERRγ are orphan nuclear receptors that regulate transcription of genes involved in oxidative phosphorylation, fatty acid oxidation, and mitochondrial biogenesis, representing key molecular mediators of exercise adaptation. SLU-PP-332 activates ERRα and ERRγ transcriptional programs, driving expression of genes including PGC-1α coactivation targets, mitochondrial electron transport chain components, and oxidative muscle fiber markers. Published research has demonstrated that ERR activation with SLU-PP-332 enhances skeletal muscle oxidative capacity and shifts fiber type composition toward fatigue-resistant phenotypes in preclinical models (Kim et al., various studies). Investigators use this compound to dissect the molecular mechanisms through which exercise produces metabolic adaptations, and to study whether pharmacological ERR activation can recapitulate specific benefits of physical activity.

SLU-PP-332 Mechanism of Action in Research

SLU-PP-332 binds to the ligand-binding domains of ERRα and ERRγ, stabilizing active conformations that recruit coactivator proteins including PGC-1α and SRC family members. This transcriptional complex drives expression of nuclear-encoded mitochondrial genes, fatty acid oxidation enzymes (CPT1, MCAD, LCAD), and oxidative phosphorylation components. In skeletal muscle, ERR activation promotes expression of slow-twitch (Type I) fiber genes including troponin I (slow), myoglobin, and succinate dehydrogenase. Downstream effects include increased mitochondrial density, enhanced fatty acid oxidation capacity, and improved oxidative metabolic efficiency.