title: A high-throughput respirometric assay for mitochondrial biogenesis and toxicity.
abstract: Mitochondria are a common target of toxicity for drugs and other chemicals and result in decreased aerobic metabolism and cell death. In contrast, mitochondrial biogenesis restores cell vitality, and there is a need for new agents to induce biogenesis. Current cell-based models of mitochondrial biogenesis or toxicity are inadequate because cultured cell lines are highly glycolytic with minimal aerobic metabolism and altered mitochondrial physiology. In addition, there are no high-throughput real-time assays that assess mitochondrial function. We adapted primary cultures of renal proximal tubular cells (RPTCs) that exhibit in vivo levels of aerobic metabolism, are not glycolytic, and retain higher levels of differentiated functions and used the Seahorse Bioscience analyzer to measure mitochondrial function in real time in multiwell plates. Using uncoupled respiration as a marker of electron transport chain (ETC) integrity, the nephrotoxicants cisplatin, HgCl(2), and gentamicin exhibited mitochondrial toxicity prior to decreases in basal respiration and cell death. Conversely, using FCCP (carbonylcyanide p-trifluoromethoxyphenylhydrazone)-uncoupled respiration as a marker of maximal ETC activity, 1-(2,5-dimethoxy-4-iodophenyl)-2-aminopropane (DOI), SRT1720, resveratrol, daidzein, and metformin produced mitochondrial biogenesis in RPTCs. The merger of the RPTC model and multiwell respirometry results in a single high-throughput assay to measure mitochondrial biogenesis and toxicity and nephrotoxic potential.
authors.affiliation: Department of Pharmaceutical and Biomedical Sciences, Medical University of South Carolina, Charleston, 29425, USA.
authors.forename: Craig C
authors.initials: CC
authors.lastname: Beeson
authors.forename: Gyda C
authors.initials: GC
authors.lastname: Beeson
authors.forename: Rick G
authors.initials: RG
authors.lastname: Schnellmann
mesh_terms: D000662:Amphetamines / Q000494:pharmacology; D000818:Animals; D000890:Anti-Infective Agents / Q000633:toxicity; D000970:Antineoplastic Agents / Q000633:toxicity; D017209:Apoptosis; D002258:Carbonyl Cyanide m-Chlorophenyl Hydrazone / Q000031:analogs & derivatives / Q000494:pharmacology; D019069:Cell Respiration / Q000187:drug effects; D002478:Cells, Cultured; D002945:Cisplatin / Q000633:toxicity; D045222:Electron Transport Chain Complex Proteins / Q000378:metabolism; D005839:Gentamicins / Q000633:toxicity; D057166:High-Throughput Screening Assays / Q000379:methods*; D007687:Kidney Tubules, Proximal / Q000166:cytology; D008627:Mercuric Chloride / Q000633:toxicity; D008928:Mitochondria / Q000378:metabolism*; D010101:Oxygen Consumption; D023701:Smegmamorpha / Q000378:metabolism
chemical_list: D000662:Amphetamines; D000890:Anti-Infective Agents; D000970:Antineoplastic Agents; D045222:Electron Transport Chain Complex Proteins; D005839:Gentamicins; C108897:carbonylcyanide 4-trifluoromethoxyphenylhydrazone; D008627:Mercuric Chloride; D002258:Carbonyl Cyanide m-Chlorophenyl Hydrazone; C015952:4-iodo-2,5-dimethoxyphenylisopropylamine; D002945:Cisplatin
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