title: 31P-topical nuclear magnetic resonance (31P-TMR) studies of cardiotoxic effects of 5-fluorouracil (5-FU) and 5'-deoxy-5-fluorouridine (5'-DFUR).
abstract: Using the 31P-topical nuclear magnetic resonance method (TMR), an attempt was made to determine the myocardial high-energy phosphate compounds (HEP) contents under in situ conditions in closed-chest animals, and the effects of opening the thorax on the myocardial energy metabolism were studied comparing the cardiotoxic effects of 5-fluorouracil (5-FU) in closed-chest and open-chest animals. It was found that the depletion of myocardial HEP produced by 5-FU was much more marked in open-chest animals than in closed-chest ones, indicating the necessity of conducting the experiments in closed-chest animals for the proper evaluation of the cardiotoxicity of certain types of compounds. Therefore, the cardiotoxicity of a prodrug of 5-FU was assessed in closed-chest animals, and it was found to be less cardiotoxic than 5-FU.
mesh_terms: D000255:Adenosine Triphosphate / Q000378:metabolism; D000818:Animals; D000970:Antineoplastic Agents / Q000633:toxicity*; D004562:Electrocardiography; D005467:Floxuridine / Q000633:toxicity*; D005472:Fluorouracil / Q000633:toxicity*; D006168:Guinea Pigs; D006321:Heart / Q000187:drug effects*; D009682:Magnetic Resonance Spectroscopy; D008297:Male; D009206:Myocardium / Q000378:metabolism*; D010725:Phosphocreatine / Q000378:metabolism
chemical_list: D000970:Antineoplastic Agents; D010725:Phosphocreatine; D005467:Floxuridine; D000255:Adenosine Triphosphate; D005472:Fluorouracil; C025034:doxifluridine