Comparison of 99mTc-N-pyridoxyl-5-methyltryptophan and 99mTc-N-(3-bromo-2,4,6-trimethylacetanilide)-iminodiace tate as hepatobiliary radiopharmaceuticals in rats

99mTc-N-(3-bromo-2,4,6-trimethylacetanilide)iminodiacetat e (I) and 99mTc-N-pyridoxyl-5-methyl-tryptophan (II) have been described as having optimal properties as hepatobiliary radiopharmaceuticals. This study compared specificity for hepatobiliary excretion, blood disappearance, rates of biliary ap...

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Bibliographic Details
Published in:Journal of pharmaceutical sciences 1984-12, Vol.73 (12), p.1861-1863
Main Authors: Fritzberg, A R, Bloedow, D C, Eshima, D, Johnson, D L
Format: Article
Language:English
Subjects:
Animals
Biliary Tract - diagnostic imaging
Imino Acids
Kinetics
Liver - diagnostic imaging
Male
Organotechnetium Compounds
Pyridoxal - analogs & derivatives
Radionuclide Imaging
Rats
Rats, Inbred Strains
Sulfobromophthalein
Technetium
Tryptophan - analogs & derivatives
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Summary:99mTc-N-(3-bromo-2,4,6-trimethylacetanilide)iminodiacetat e (I) and 99mTc-N-pyridoxyl-5-methyl-tryptophan (II) have been described as having optimal properties as hepatobiliary radiopharmaceuticals. This study compared specificity for hepatobiliary excretion, blood disappearance, rates of biliary appearance, and pharmacokinetic parameters including hepatic clearance, volumes of distribution, and mean residence times in normal and sulfobromophthalein-treated rats. The specificity of I was higher as indicated by 94% in the bile at 90 min compared to 91% for II in normal rats and a urine excretion of 0.3% for I compared with 1.9% for II. In sulfobromophthalein-treated animals, urine excretion increases were only to 0.5 and 3.0% for I and II, respectively. In control rats, blood disappearance was similar for both I and II, but II disappeared faster in treated animals. The clearance of II was 70 mL/min/kg in normal and 47 mL/min/kg in treated rats; clearance of I was 51 and 30 mL/min/kg in normal and treated rats, respectively. Volumes of distribution were larger for II. Compound I was superior in specificity while II was superior in clearance and excretion kinetics.
ISSN:0022-3549