title: Effects of administration routes on the uptake of uridine and 5-fluorouridine into an adenocarcinoma transplanted to rat liver.
abstract: In a model of secondary liver cancer in Wistar rats, the effect of different administration routes on the uptake of 3H-uridine into tumor and several normal tissues was studied. The rats were inoculated with a tumor cell suspension in the central liver lobe. Ten days later, they were distributed into four groups with a catheter placed in the gastroduodenal artery, the portal vein, one of the femoral veins, or in the peritoneal cavity. 3H-uridine was injected 46 h later and after an additional 90 minutes the animals were anesthetised and pieces of liver tumor and normal tissues were removed and frozen. The incorporation into the acid-soluble fraction and RNA was analyzed. In a separate experiment, 3H-fluorouridine was administered by the gastroduodenal artery and a comparison was made with the uptake of 3H-uridine. A significantly higher amount of uridine was incorporated into the tumor by the arterial route. The intraportal and intraperitoneal routes were comparable, while a somewhat higher incorporation was found by the systemic route. The consequences of using the different routes upon the incorporation into RNA of tumor and dose-limiting organs are demonstrated. With the aid of this experimental model, it is possible to evaluate further the effect by different manipulations on different drugs regarding the administration route.
mesh_terms: D000230:Adenocarcinoma / Q000378:metabolism*; D000818:Animals; D002404:Catheterization; D005260:Female; D005268:Femoral Vein; D006499:Hepatic Artery; D008114:Liver Neoplasms, Experimental / Q000378:metabolism*; D010529:Peritoneal Cavity; D011169:Portal Vein; D012334:RNA, Neoplasm / Q000378:metabolism; D051381:Rats; D011919:Rats, Inbred Strains; D014018:Tissue Distribution; D014529:Uridine / Q000008:administration & dosage / Q000031:analogs & derivatives* / Q000378:metabolism*
chemical_list: D012334:RNA, Neoplasm; C001943:5-fluorouridine; D014529:Uridine