Pharmacokinetics, antifolate activity and tissue distribution of PT523 in SCC VII tumor-bearing mice.
Abstract | PURPOSE: METHODS: RESULTS: Areas under the curve, mean residence times, whole body clearances, apparent distribution volumes, and plasma protein binding of PT523 vs methotrexate were, respectively, 4311 vs 6472 microM x min(-1); 20 vs 16 min; 0.56 vs 0.36 ml min(-1); 532 vs 325 ml x kg(-1); and 70% vs 30%. Both PT523 and methotrexate caused time-dependent declines in 5,10-methylenetetrahydrofolate in tumor and marrow, but not in gut mucosa [corrected]. Gut levels began to recover within 4 h in the PT523-treated group only. [14C] PT523 distributed mainly into the liver, duodenum, kidneys, lungs, tumor, pancreas and muscle; less into the spleen, blood cells, heart, brain and testicles; and very little into gut [corrected. Only 35% of the dose was excreted, and 2.9-fold more in feces than urine. CONCLUSIONS: Despite its more rapid clearance, accumulation of PT523 in extravascular tissues was greater than that of methotrexate. Consequently, less PT523 was recovered in feces and urine and its apparent volume of distribution was greater. PT523 selectively depleted 5,10-methylenetetrahydrofolate pools in tumor and, less persistently, in marrow, but spared the gut mucosa [corrected]. [14C] PT523 tissue distribution correlated with organ mass and blood supply.
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Authors | J E Wright, M Pardo, A Tretyakov, W L Alperin, D Trites, A Rosowsky |
Journal | Cancer chemotherapy and pharmacology
(Cancer Chemother Pharmacol)
Vol. 42
Issue 4
Pg. 300-6
( 1998)
ISSN: 0344-5704 [Print] Germany |
PMID | 9744775
(Publication Type: Comparative Study, Journal Article, Research Support, U.S. Gov't, P.H.S.)
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Chemical References |
- Antineoplastic Agents
- Carbon Radioisotopes
- Folic Acid Antagonists
- Pterins
- Tetrahydrofolates
- 5,10-methylenetetrahydrofolic acid
- N(alpha)-(4-amino-4-deoxypteroyl)-N(delta)-hemiphthaloyl-L-ornithine
- Ornithine
- Methotrexate
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Topics |
- Animals
- Antineoplastic Agents
(pharmacokinetics, pharmacology)
- Area Under Curve
- Carbon Radioisotopes
- Carcinoma, Squamous Cell
(metabolism)
- Folic Acid Antagonists
(pharmacokinetics, pharmacology)
- Injections, Intravenous
- Isotope Labeling
- Male
- Methotrexate
(pharmacokinetics, pharmacology)
- Mice
- Mice, Inbred C3H
- Neoplasms, Experimental
(metabolism)
- Ornithine
(analogs & derivatives, chemical synthesis, pharmacokinetics, pharmacology)
- Pterins
(chemical synthesis, pharmacokinetics, pharmacology)
- Tetrahydrofolates
(metabolism)
- Tissue Distribution
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