Iodine-125 labeled phenylphosphonic acid: a new radiopharmaceutical for long-term investigations of the skeleton.

Abstract:

:A skeletal seeking radiopharmaceutical labeled with a long-lived radionuclide was developed to evaluate regional bone formation and its subsequent resorption. The agent is [phosphonate (phenylmethylene hydroxy) bis] - I-125 or I-125 phi PA. Tissue distribution studies in mice (N = 16) showed approximately 40% of the administered dose to be retained by the skeleton up to 336 hours post IV injection. The percentage of the dose accumulated by the thyroid gland remained at less than 0.5%, indicating minimal deiodination of the I-125 phi PA. Whole body retention studies in the same species revealed a triexponential release pattern with the longest component comprising 33% of the dose with a biologic half-life of 962 days. A fractured rat tibia model was studied with I-125 phi PA and Tc-99m MDP. Chronic loss of the I125 phi PA relative to normal tibia was quantitated: five days (62.8%); 30 days (47.4%). Concomitant increased uptake of the Tc-99m MDP was observed at the fracture site relative to normal: five days (186%); 30 days (1,041%). The above data suggest that I-125 phi PA can be utilized to measure acute bone formation and chronic resorption.

journal_name

Skeletal Radiol

journal_title

Skeletal radiology

authors

Castronovo FP Jr,Strauss HW,McKusick KA,Potsaid MS

doi

10.1007/BF00361978

subject

Has Abstract

pub_date

1982-01-01 00:00:00

pages

233-7

issue

4

eissn

0364-2348

issn

1432-2161

journal_volume

7

pub_type

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