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Tryptophan-derived uremic metabolites are agonists of the aryl hydrocarbon receptor (AHR), which has been shown to be activated in CKD. This study investigated the role of the AHR in skeletal muscle pathology of CKD. Compared with controls with normal kidney function, AHR-dependent gene expression (\n                    <jats:italic>CYP1A1<\/jats:italic>\n                    and\n                    <jats:italic>CYP1B1<\/jats:italic>\n                    ) was significantly upregulated in skeletal muscle of patients with CKD, and the magnitude of AHR activation was inversely correlated with mitochondrial respiration. In mice with CKD, muscle mitochondrial oxidative phosphorylation (OXPHOS) was markedly impaired and strongly correlated with the serum level of tryptophan-derived uremic metabolites and AHR activation. Muscle-specific deletion of the AHR substantially improved mitochondrial OXPHOS in male mice with the greatest uremic toxicity (CKD + probenecid) and abolished the relationship between uremic metabolites and OXPHOS. The uremic metabolite\/AHR\/mitochondrial axis in skeletal muscle was verified using muscle-specific AHR knockdown in C57BL\/6J mice harboring a high-affinity AHR allele, as well as ectopic viral expression of constitutively active mutant AHR in mice with normal renal function. Notably, OXPHOS changes in AHR\n                    <jats:sup>mKO<\/jats:sup>\n                    mice were present only when mitochondria were fueled by carbohydrates. Further analyses revealed that AHR activation in mice led to significantly increased pyruvate dehydrogenase kinase 4 (Pdk4) expression and phosphorylation of pyruvate dehydrogenase enzyme. These findings establish a uremic metabolite\/AHR\/Pdk4 axis in skeletal muscle that governs mitochondrial deficits in carbohydrate oxidation during CKD.\n                  <\/jats:p>","DOI":"10.1172\/jci.insight.178372","type":"journal-article","created":{"date-parts":[[2024,5,21]],"date-time":"2024-05-21T14:00:31Z","timestamp":1716300031000},"source":"Crossref","is-referenced-by-count":15,"title":["A tryptophan-derived uremic metabolite\/Ahr\/Pdk4 axis governs skeletal muscle mitochondrial energetics in chronic kidney disease"],"prefix":"10.1172","volume":"9","author":[{"ORCID":"https:\/\/orcid.org\/0000-0003-4823-8547","authenticated-orcid":true,"given":"Trace","family":"Thome","sequence":"first","affiliation":[{"name":"Department of Applied Physiology and Kinesiology and"}],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Nicholas A.","family":"Vugman","sequence":"additional","affiliation":[{"name":"Department of Applied Physiology and Kinesiology 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