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Per-claim provenance."}],"not_medical_advice":true},"slug":"slu-pp-332","title":"SLU-PP-332 is a chemical tool that switches on the endurance-training programme in muscle","register":"canonical","tags":["slu-pp-332","ERR agonist","exercise mimetic","mitochondria","preclinical"],"updated_at":"2026-08-05T09:39:20.822Z","body_excerpt":"SLU-PP-332 is a small molecule that turns on a genetic programme normally switched on by hard aerobic exercise. In mice it does roughly what a run does to muscle. It has never been given to a human being in a published study, and it was not built to be a drug.\n\nThat last part matters more than anything else about it, so it goes first. The paper that introduced it describes it as a chemical tool: the authors say it \"has sufficient pharmacokinetic properties to be used as an in vivo chemical tool.\" A tool is something you use to find out whether an idea is worth pursuing. It is not a candidate you intend to put in people. Compounds designed as drugs get years of work on absorption, half-life, off-target effects and toxicology before anyone considers a first human dose. SLU-PP-332 got enough of that to survive an experiment in a mouse.\n\n## What ERR is, and why anyone went looking for a molecule that hits it\n\nInside almost every cell in your body there are proteins whose whole job is to switch genes on. They sit in the cell, wait for a signal, and when the signal arrives they bind to DNA and start production of whichever proteins that gene encodes. They are called nuclear receptors, because they work in the nucleus where the DNA is.\n\nThree of them are called estrogen-related receptors — ERRα, ERRβ and ERRγ. The name is a historical accident. They look structurally similar to the receptor that oestrogen binds to, which is how they were first identified, but oestrogen does not bind to them and they have nothing to do with sex hormones. They are called \"orphan\" receptors because nobody has found the natural signal that switches them on. We know what they do without knowing what tells them to do it.\n\nWhat they do is run mitochondria. Mitochondria are the structures inside cells that convert fuel into usable energy, and a muscle cell that has done a lot of endurance work has more of them, and better ones. ERRα in particular controls a large set of genes governing how many mitochondria a muscle has, how well they work, and whether the muscle prefers to burn fat or sugar. When you train for endurance, ERR activity is part of what carries out the resulting change.\n\nSo the reasoning was direct: if ERR carries out the adaptation, a molecule that activates ERR should produce the adaptation without the training. That reasoning was easier to state than to act on. The paper introducing SLU-PP-332 says why: \"although ERRβ/γ agonists have been designed, there have been significant difficulties in designing compounds with ERRα agonist activity.\" ERRα was the one that mattered most and the one nobody could hit. SLU-PP-332's actual achievement is that it hits all three, \"but has the highest potency for ERRα.\"\n\n## What happened in the mice\n\nTwo studies carry almost all of the evidence.\n\nThe first, in *ACS Chemical Biology* in 2023, established what the molecule does. In cells it \"increases mitochondrial function and cellular respiration in a skeletal muscle cell line.\" In animals it changed the muscle itself: \"When administered to mice, SLU-PP-332 increased the type IIa oxidative skeletal muscle fibers and enhanced exercise capacity.\" Type IIa fibres are the intermediate kind — faster than the slow endurance fibres, far more fatigue-resistant than the fast explosive ones, and rich in mitochondria. Growing the type IIa share is one of the specific things endurance training does. The compound produced that change in animals that had not trained.\n\nThe second, in the *Journal of Pharmacology and Experimental Therapeutics* in January 2024, asked whether that translated into metabolic benefit in obese animals. Diet-induced obese mice and ob/ob mice — a strain genetically unable to produce leptin, so they overeat and become obese — were given the compound. The result, in the paper's words: \"SLU-PP-332 administration mimics exercise-induced benefits on whole-body metabolism in mice including increased energy expenditure and fatty acid oxidation. These effect","ranking":"safety-first (interaction_risk/limitations), then quote-gated effective_weight","claims":[{"id":"c5","text":"No human study of SLU-PP-332 has been published: no phase I, no safety study, no pharmacokinetic run, so its half-life and oral bioavailability in people are unknown.","tier":"human","interaction_risk":false,"status":"active","source_ids":[],"why_material":"It means any specific human dose or protocol was invented rather than derived, because the clearance data needed to scale an animal dose does not exist.","retracted_at":null,"retraction_reason":null,"challenged_by":[],"effective_weight":0.8,"quote_gated":false},{"id":"c1","text":"SLU-PP-332 is an agonist of the estrogen-related receptors ERRα, ERRβ and ERRγ, with its highest potency at ERRα.","tier":"mechanistic","interaction_risk":false,"status":"active","source_ids":["s1","s3"],"why_material":"ERRα is the subtype that governs the muscle mitochondrial programme and the one that had resisted every previous attempt at an agonist, which is what makes this compound a real scientific result.","retracted_at":null,"retraction_reason":null,"challenged_by":[],"effective_weight":0.3,"quote_gated":false},{"id":"c2","text":"Its discovery paper describes it as a chemical tool with sufficient pharmacokinetic properties to be used in vivo, not as a drug candidate.","tier":"mechanistic","interaction_risk":false,"status":"active","source_ids":["s1"],"why_material":"This is the single most important fact about the compound and it comes from the people who made it. A tool is built to test whether an idea is worth pursuing, not to be given to a person.","retracted_at":null,"retraction_reason":null,"challenged_by":[],"effective_weight":0.3,"quote_gated":false},{"id":"c8","text":"Exercise mimetic describes activation of a shared genetic programme, not equivalence to training: the compound does nothing for bone loading, tendon strength, capillary density or the heart as a pump.","tier":"mechanistic","interaction_risk":false,"status":"active","source_ids":["s1"],"why_material":"The phrase is technically accurate and will be read as does what exercise does. Naming what it leaves out is the difference between informing a reader and selling to one.","retracted_at":null,"retraction_reason":null,"challenged_by":[],"effective_weight":0.3,"quote_gated":false},{"id":"c3","text":"In mice, SLU-PP-332 increased the proportion of type IIa oxidative skeletal muscle fibres and enhanced exercise capacity.","tier":"animal","interaction_risk":false,"status":"active","source_ids":["s2"],"why_material":"The fibre-type shift is one of the specific adaptations endurance training produces, and the compound produced it in animals that had not trained.","retracted_at":null,"retraction_reason":null,"challenged_by":[],"effective_weight":0.1,"quote_gated":false},{"id":"c4","text":"In diet-induced obese and ob/ob mice it raised energy expenditure and fatty acid oxidation, reduced fat mass accumulation, and improved insulin sensitivity.","tier":"animal","interaction_risk":false,"status":"active","source_ids":["s4","s5"],"why_material":"Every fat-loss figure quoted for this compound traces to this study, and every measurement in it was taken in a mouse.","retracted_at":null,"retraction_reason":null,"challenged_by":[],"effective_weight":0.1,"quote_gated":false},{"id":"c6","text":"Pan-ERR agonists improved heart failure in animal models by enhancing cardiac fatty acid metabolism and mitochondrial function.","tier":"animal","interaction_risk":false,"status":"active","source_ids":["s6"],"why_material":"Cuts both ways and both matter: the mechanism genuinely helps a failing heart, and it is the clearest published evidence that this compound acts on cardiac muscle at all.","retracted_at":null,"retraction_reason":null,"challenged_by":[],"effective_weight":0.1,"quote_gated":false},{"id":"c7","text":"ERR agonism also reversed mitochondrial dysfunction and inflammation in the aging kidney in animal models, making the mechanism systemic rather than confined to skeletal muscle.","tier":"animal","interaction_risk":false,"status":"active","source_ids":["s7"],"why_material":"Four organs, four real effects. Exercise produces these adaptations gradually, locally and in proportion to work done; a drug has no such self-limiting quality.","retracted_at":null,"retraction_reason":null,"challenged_by":[],"effective_weight":0.1,"quote_gated":false}],"sources":[{"id":"s1","type":"pubmed","url":"https://pubmed.ncbi.nlm.nih.gov/36988910/","title":"Synthetic ERRα/β/γ Agonist Induces an ERRα-Dependent Acute Aerobic Exercise Response and Enhances Exercise Capacity","quote":"Here, we report the identification of a synthetic ERR pan agonist, SLU-PP-332, that targets all three ERRs but has the highest potency for ERRα. Additionally, SLU-PP-332 has sufficient pharmacokinetic properties to be used as an in vivo chemical tool.","summary":"Billon et al., ACS Chem Biol 2023: the paper that introduced the compound. Its own description of what SLU-PP-332 is — a chemical tool with enough pharmacokinetics to survive an animal experiment, not a drug candidate. That framing is the single most important fact about it and it comes from the people who made it.","claim_ids":[],"hash":"fb67c9ddf6e5943cc5549a2fcdf31889f7775c5c12ba398a7505672d3fbc8d74"},{"id":"s2","type":"pubmed","url":"https://pubmed.ncbi.nlm.nih.gov/36988910/","title":"Synthetic ERRα/β/γ Agonist Induces an ERRα-Dependent Acute Aerobic Exercise Response and Enhances Exercise Capacity","quote":"When administered to mice, SLU-PP-332 increased the type IIa oxidative skeletal muscle fibers and enhanced exercise capacity.","summary":"SLU-PP-332 in mice: type IIa oxidative fibres and exercise capacity. The core animal result. Type IIa fibres are the fatigue-resistant, mitochondria-rich intermediate type, and growing their share is one of the specific things endurance training does. The compound produced that shift in animals that had not trained.","claim_ids":[],"hash":"780d416d0062f20d92145e696efa24aef55d184369d59dc162510dbf6a0a3820"},{"id":"s3","type":"pubmed","url":"https://pubmed.ncbi.nlm.nih.gov/36988910/","title":"Synthetic ERRα/β/γ Agonist Induces an ERRα-Dependent Acute Aerobic Exercise Response and Enhances Exercise Capacity","quote":"Three ERR subtypes exist (ERRα, β, and γ), and although ERRβ/γ agonists have been designed, there have been significant difficulties in designing compounds with ERRα agonist activity.","summary":"Why ERRα had resisted every previous attempt. The reason this compound is a real scientific result rather than another metabolic molecule. ERRα is the subtype that governs the muscle programme and it was the one nobody could hit. SLU-PP-332 hits all three with the highest potency at ERRα.","claim_ids":[],"hash":"c24e86dd352b026364e7945a4dca10013648bf244f47ef76562f2c15c179c016"},{"id":"s4","type":"pubmed","url":"https://pubmed.ncbi.nlm.nih.gov/37739806/","title":"A Synthetic ERR Agonist Alleviates Metabolic Syndrome","quote":"SLU-PP-332 administration mimics exercise-induced benefits on whole-body metabolism in mice including increased energy expenditure and fatty acid oxidation. These effects were accompanied by decreased fat mass accumulation. Additionally, the ERR agonist effectively reduced obesity and improved insulin sensitivity in models of metabolic syndrome.","summary":"Billon et al., J Pharmacol Exp Ther 2024: diet-induced obese and ob/ob mice. This is the study behind every fat-loss figure quoted for this compound. Note what it says and does not say — every measurement is in mice.","claim_ids":[],"hash":"02b1250b48f992337a7cfb737cf16f2e0570eb6854abe8e8a33054ca06c1c905"},{"id":"s5","type":"pubmed","url":"https://pubmed.ncbi.nlm.nih.gov/37739806/","title":"A Synthetic ERR Agonist Alleviates Metabolic Syndrome","quote":"An estrogen receptor-related orphan receptor agonist, SLU-PP-332, with exercise mimetic activity, holds promise as a therapeutic to treat metabolic diseases by decreasing fat mass in mouse models of obesity.","summary":"The authors’ own significance statement, with its qualifier intact. The qualifier \"in mouse models of obesity\" is in the authors’ own summary sentence. It is the part that gets dropped when the numbers are repeated.","claim_ids":[],"hash":"bfdc8f44728884d333676e94fa79d6b368ca771806f4ca6c6fc5eec761f1caa8"},{"id":"s6","type":"pubmed","url":"https://pubmed.ncbi.nlm.nih.gov/37961903/","title":"Novel Pan-ERR Agonists Ameliorate Heart Failure Through Enhancing Cardiac Fatty Acid Metabolism and Mitochondrial Function","quote":"Novel Pan-ERR Agonists Ameliorate Heart Failure Through Enhancing Cardiac Fatty Acid Metabolism and Mitochondrial Function.","summary":"Xu, Billon et al., Circulation 2024. The most double-edged paper in the set. A failing heart loses the ability to burn fat efficiently, and restoring that is a real therapeutic idea — these agonists did it in animal models. It is also the clearest published statement that this compound acts on cardiac muscle, which is dense with both mitochondria and ERR. Nobody has published what it does to a structurally normal human heart over months.","claim_ids":[],"hash":"88a1626f35827fc6af0065259691c537917add9ed19f2dee2ac1be19971d4282"},{"id":"s7","type":"pubmed","url":"https://pubmed.ncbi.nlm.nih.gov/37717940/","title":"Estrogen-Related Receptor Agonism Reverses Mitochondrial Dysfunction and Inflammation in the Aging Kidney","quote":"Estrogen-Related Receptor Agonism Reverses Mitochondrial Dysfunction and Inflammation in the Aging Kidney.","summary":"Wang et al., Am J Pathol 2023. A fourth organ, a fourth real effect, same pattern. The mechanism is systemic — which is the point of it and also the thing to be careful about. Exercise produces these adaptations gradually, locally, and in proportion to the work done. A drug has no such self-limiting quality.","claim_ids":[],"hash":"3ff096fde160703c4d04b249fdf292217bfa96fef4580ea4871142007c66ff24"}],"anecdotal_sources":[],"scientific_sources":[{"id":"s1","type":"pubmed","url":"https://pubmed.ncbi.nlm.nih.gov/36988910/","title":"Synthetic ERRα/β/γ Agonist Induces an ERRα-Dependent Acute Aerobic Exercise Response and Enhances Exercise Capacity","quote":"Here, we report the identification of a synthetic ERR pan agonist, SLU-PP-332, that targets all three ERRs but has the highest potency for ERRα. Additionally, SLU-PP-332 has sufficient pharmacokinetic properties to be used as an in vivo chemical tool.","summary":"Billon et al., ACS Chem Biol 2023: the paper that introduced the compound. Its own description of what SLU-PP-332 is — a chemical tool with enough pharmacokinetics to survive an animal experiment, not a drug candidate. That framing is the single most important fact about it and it comes from the people who made it.","claim_ids":[],"hash":"fb67c9ddf6e5943cc5549a2fcdf31889f7775c5c12ba398a7505672d3fbc8d74"},{"id":"s2","type":"pubmed","url":"https://pubmed.ncbi.nlm.nih.gov/36988910/","title":"Synthetic ERRα/β/γ Agonist Induces an ERRα-Dependent Acute Aerobic Exercise Response and Enhances Exercise Capacity","quote":"When administered to mice, SLU-PP-332 increased the type IIa oxidative skeletal muscle fibers and enhanced exercise capacity.","summary":"SLU-PP-332 in mice: type IIa oxidative fibres and exercise capacity. The core animal result. Type IIa fibres are the fatigue-resistant, mitochondria-rich intermediate type, and growing their share is one of the specific things endurance training does. The compound produced that shift in animals that had not trained.","claim_ids":[],"hash":"780d416d0062f20d92145e696efa24aef55d184369d59dc162510dbf6a0a3820"},{"id":"s3","type":"pubmed","url":"https://pubmed.ncbi.nlm.nih.gov/36988910/","title":"Synthetic ERRα/β/γ Agonist Induces an ERRα-Dependent Acute Aerobic Exercise Response and Enhances Exercise Capacity","quote":"Three ERR subtypes exist (ERRα, β, and γ), and although ERRβ/γ agonists have been designed, there have been significant difficulties in designing compounds with ERRα agonist activity.","summary":"Why ERRα had resisted every previous attempt. The reason this compound is a real scientific result rather than another metabolic molecule. ERRα is the subtype that governs the muscle programme and it was the one nobody could hit. SLU-PP-332 hits all three with the highest potency at ERRα.","claim_ids":[],"hash":"c24e86dd352b026364e7945a4dca10013648bf244f47ef76562f2c15c179c016"},{"id":"s4","type":"pubmed","url":"https://pubmed.ncbi.nlm.nih.gov/37739806/","title":"A Synthetic ERR Agonist Alleviates Metabolic Syndrome","quote":"SLU-PP-332 administration mimics exercise-induced benefits on whole-body metabolism in mice including increased energy expenditure and fatty acid oxidation. These effects were accompanied by decreased fat mass accumulation. Additionally, the ERR agonist effectively reduced obesity and improved insulin sensitivity in models of metabolic syndrome.","summary":"Billon et al., J Pharmacol Exp Ther 2024: diet-induced obese and ob/ob mice. This is the study behind every fat-loss figure quoted for this compound. Note what it says and does not say — every measurement is in mice.","claim_ids":[],"hash":"02b1250b48f992337a7cfb737cf16f2e0570eb6854abe8e8a33054ca06c1c905"},{"id":"s5","type":"pubmed","url":"https://pubmed.ncbi.nlm.nih.gov/37739806/","title":"A Synthetic ERR Agonist Alleviates Metabolic Syndrome","quote":"An estrogen receptor-related orphan receptor agonist, SLU-PP-332, with exercise mimetic activity, holds promise as a therapeutic to treat metabolic diseases by decreasing fat mass in mouse models of obesity.","summary":"The authors’ own significance statement, with its qualifier intact. The qualifier \"in mouse models of obesity\" is in the authors’ own summary sentence. It is the part that gets dropped when the numbers are repeated.","claim_ids":[],"hash":"bfdc8f44728884d333676e94fa79d6b368ca771806f4ca6c6fc5eec761f1caa8"},{"id":"s6","type":"pubmed","url":"https://pubmed.ncbi.nlm.nih.gov/37961903/","title":"Novel Pan-ERR Agonists Ameliorate Heart Failure Through Enhancing Cardiac Fatty Acid Metabolism and Mitochondrial Function","quote":"Novel Pan-ERR Agonists Ameliorate Heart Failure Through Enhancing Cardiac Fatty Acid Metabolism and Mitochondrial Function.","summary":"Xu, Billon et al., Circulation 2024. The most double-edged paper in the set. A failing heart loses the ability to burn fat efficiently, and restoring that is a real therapeutic idea — these agonists did it in animal models. It is also the clearest published statement that this compound acts on cardiac muscle, which is dense with both mitochondria and ERR. Nobody has published what it does to a structurally normal human heart over months.","claim_ids":[],"hash":"88a1626f35827fc6af0065259691c537917add9ed19f2dee2ac1be19971d4282"},{"id":"s7","type":"pubmed","url":"https://pubmed.ncbi.nlm.nih.gov/37717940/","title":"Estrogen-Related Receptor Agonism Reverses Mitochondrial Dysfunction and Inflammation in the Aging Kidney","quote":"Estrogen-Related Receptor Agonism Reverses Mitochondrial Dysfunction and Inflammation in the Aging Kidney.","summary":"Wang et al., Am J Pathol 2023. A fourth organ, a fourth real effect, same pattern. The mechanism is systemic — which is the point of it and also the thing to be careful about. Exercise produces these adaptations gradually, locally, and in proportion to the work done. A drug has no such self-limiting quality.","claim_ids":[],"hash":"3ff096fde160703c4d04b249fdf292217bfa96fef4580ea4871142007c66ff24"}],"user_reports":[],"related_articles":[],"question_graph":{"slug":"slu-pp-332","questions":[],"evidence":[],"edges":[],"counts":{"questions":0,"evidence":0,"edges":0}},"honesty":{"active_claims":8,"retracted_claims":0,"cut_claims":0,"challenges":0,"scrub_events":0,"note":"Retracted/cut claims stay on ledger but are excluded from ask unless ?include_inactive=1"},"counts":{"claims":8,"claims_total":8,"sources":7,"anecdotal":0,"scientific":7,"user_reports":0,"questions":0,"evidence_ingests":0}}