title: [The effect of applied cytotoxic drugs on biological behaviour of 99mTc-radiopharmaceuticals].
abstract: BACKGROUND
  This study was aimed at investigating the influence of certain cytotoxic drugs on the organ uptake of the following 9mTc-radiopharmaceuticals: 99mTc-2,3-dicarboxypropane-1, 1-diphosphonic acid, 99mTc-meso-2,3-dimercaptosuccinic acid, 9mTc-tin colloid and 99mTc-macraggregated albumin. Methotrexate sodium and cyclophosphamide were used as models to evaluate these effects.
  
  
  METHODS
  Two groups of healthy male Wistar rats were treated separately by oral application of the drugs for 7 days. On the eighth day, each of the 99Tc-radiopharmaceuticals was applied in a separate group of treated animals. They were sacrificed at different time intervals and the radioactivity in the organs of interest was measured. The organ uptake of the 99mTc-radiopharmaceuticals in an additional control group of animals was also studied.
  
  
  RESULTS
  The results obtained showed an alteration in the organ uptake of 99mTc-radiopharmaceuticals in animals treated with cytotoxic drugs. In the rats treated with methotrexate sodium, there was a higher uptake of 99mTc-meso-2,3-dimercaptosuccinic acid in the bones, stomach and intestine, a higher uptake of 99mTc-2,3-dicarboxypropane-1-,1-diphosphronic acid in the bones, intestine, blood and muscle, a lower uptake of 99mTc-tin colloid in the liver and a lower accumulation of 99mTc-macroaggregated albumin in the lungs. Cyclophosphamide-treated animals showed enhanced uptake of 99mTc-meso-2,3-dimercaptosuccinic acid in the kidneys, a twofold enhanced uptake of 99mTc-2,3-dicarboxypropane-1,1-diphosphronic acid in all organs except the stomach, a decreased uptake of 99mTc-tin colloid in the lungs, spleen and kidneys and a significantly decreased uptake of 99mTc-macroaggregated albumin in the lungs.
  
  
  CONCLUSIONS
  These results confirm that both methotrexate sodium and cyclophosphamide may alter the organ uptake of 99mTc-radiopharmaceuticals in experimental animals.
authors.affiliation: Laboratorija za radioizotope, Institut za nuklearne nauke Vinica, Beograd. drinaj@vinca.rs
authors.forename: Drina
authors.initials: D
authors.lastname: Janković
authors.forename: Divna
authors.initials: D
authors.lastname: Dokić
authors.forename: Nadezda
authors.initials: N
authors.lastname: Nikolić
authors.forename: Pavle
authors.initials: P
authors.lastname: Glodić
mesh_terms: D000818:Animals; D000970:Antineoplastic Agents / Q000494:pharmacology*; D003520:Cyclophosphamide / Q000494:pharmacology*; D008297:Male; D008727:Methotrexate / Q000494:pharmacology*; D015609:Organotechnetium Compounds / Q000493:pharmacokinetics*; D051381:Rats; D017208:Rats, Wistar; D014018:Tissue Distribution
chemical_list: D000970:Antineoplastic Agents; D015609:Organotechnetium Compounds; D003520:Cyclophosphamide; D008727:Methotrexate