title: A phase 1 pharmacokinetic study of ATX-101: serum lipids and adipokines following synthetic deoxycholic acid injections.
abstract: BACKGROUND
  ATX-101 (deoxycholic acid injection, Kythera Biopharmaceuticals, Inc.) is a proprietary formulation of pure synthetic deoxycholic acid (DCA). It is undergoing clinical investigation as an injectable drug for contouring the submental area by reducing submental fat (SMF). When injected into subcutaneous fat, ATX-101 causes focal adipocytolysis, the targeted destruction of fat cells.
  
  
  OBJECTIVE
  This phase 1 study evaluated the safety, pharmacokinetics (PK), and pharmacodynamic effects of ATX-101 (100-mg total dose).
  
  
  METHODS
  Following PK evaluation of baseline endogenous DCA, lipids, and adipokines in the initial stage of the study (samples collected at hours 0.25, 0.5, 1, 1.5, 2, 4, 6, 12, 15.5, and 24.5), 10 subjects received subcutaneous injections of ATX-101 into abdominal fat. PK evaluation of DCA, lipids, and adipokines was repeated in the second phase of the study.
  
  
  RESULTS
  After ATX-101 injections, plasma concentration of DCA increased transiently, reached a maximum plasma concentration rapidly, and returned to endogenous concentrations within 12 h postdose. ATX-101 injection was not associated with any clinically meaningful changes in systemic concentrations of total cholesterol, total triglycerides, free fatty acids, C-reactive protein, or interleukin-6. Adverse events were mild in severity, transient, and showed a temporal relationship to dosing.
  
  
  CONCLUSIONS
  This study demonstrated favorable safety and PK profiles, and no clinically meaningful changes in DCA, lipids, and proinflammatory cytokines following subcutaneous injection of ATX-101. Our results support continued clinical investigation of ATX-101 as an injectable drug to reduce SMF.
authors: Private Practice, Carpinteria, CA, USA; Chief Medical Officer, Kythera Biopharmaceuticals, Inc., Calabasas, CA, USA.
authors: Patricia
authors: P
authors: Walker
authors: Daniel
authors: D
authors: Lee
mesh_terms: D050153:Abdominal Fat / Q000378:metabolism*; D054392:Adipokines / Q000097:blood*; D000328:Adult; D002784:Cholesterol / Q000097:blood; D003840:Deoxycholic Acid / Q000009:adverse effects / Q000493:pharmacokinetics*; D004075:Diglycerides / Q000097:blood; D005230:Fatty Acids, Nonesterified / Q000097:blood; D005260:Female; D006801:Humans; D007279:Injections, Subcutaneous; D008055:Lipids / Q000097:blood*; D008297:Male; D014280:Triglycerides / Q000097:blood; D055815:Young Adult
chemical_list: D054392:Adipokines; D004075:Diglycerides; D005230:Fatty Acids, Nonesterified; D008055:Lipids; D014280:Triglycerides; D003840:Deoxycholic Acid; D002784:Cholesterol
keywords: ATX-101; adipokines; deoxycholic acid; lipids; pharmacokinetics; submen-tal fat