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PubMed1982

Radioactive iodination of lymphocyte surface proteins and characterization of their molecular properties.

Two radioiodination methods for surface proteins on mouse lymphocyte membrane, that is, the lactoperoxidase method and the chloramine T method, were comparatively investigated. The extents of iodination under various conditions were determined by measurements of radioactivities incorporated into the cell fractions and into the protein components isolated by specific immunoprecipitation from lyzates of the labeled cells. It was demonstrated that the chloramine T method, as well as the lactoperoxidase method, was applicable to label the lymphocyte surface proteins without any significant labeling of the cytoplasmic proteins. It was also found that the iodination efficiencies of the membrane immunoglobulin polypeptide chains in these two labeling methods were different in each of the isotopes, mu and delta chains. The possibility that the differences are related to their primary structures and to their exposure or anchorage profiles on the cell membrane is discussed with reference to the reaction mechanisms of the two labeling methods.

Animals↗
PubMed1985

Radioactive iodine-125 implantation for cancer of the prostate.

Localized cancer of the prostate can be treated by radical prostatectomy, external beam irradiation, or radioactive implantation with similar survival results. Radical prostatectomy, however, almost universally results in impotency, although a new, nerve-sparing procedure may preserve potency in B1 patients. External beam irradiation radiates a large volume of tissue with significant rectal and bladder morbidity, 23-47% risk of impotency, and requires prolonged treatment (6-8 weeks). Radioactive implantation may be done suprapubically or transperineally using iodine-125, gold-198, or radon-222 permanent implantation techniques and iridium-192 or radium-226 removable implantation techniques. Interstitial iodine-125 implantation is frequently employed since it is a short procedure and limits the morbidity to a 7% incidence of impotency, 20% urinary complications, and 5% rectal complications. The overall 5-year survival of patients with iodine-125 is 79%, the survival rate decreasing with increasing T or N stage or increasing grade of tumor.

Brachytherapy↗
PubMed1977

Preparation of radioactive iodinated cholylhistamine for use in the radioimmunoassay of cholic acid.

A major handicap in the development of simple and accurate radioimmunoassay procedures for bile acids has been the lack of a radioactive standard of high specific activity. To provide such a compound, we first synthesized cholylhistamine using the carbodiimide reaction. The hypothesized structure was confirmed by elemental analysis, thin-layer chromatography, infrared and mass spectral analysis. The cholylhistamine was then iodinated with 125I, using the choloramine-T method. The 125I-cholylhistamine was bound by antisera raised against a cholic acid-bovine serum albumin conjugate. This procedure should prove useful in preparing radioactive conjugates for all of the bile acids.

Cholic Acids↗
PubMed2004

Papillary thyroid cancer with chest metastases only detected using radioactive iodine.

BACKGROUND: Insufficient information exists on the prognostic factors of papillary thyroid cancer (PTC) with chest metastases, which is detected only using a radioactive iodide (131I) whole body scan (WBS) but could not be detected using radiographic findings. The aim of this study was to analyze the clinical features and treatment results of patients with PTC. METHODS: This retrospective study includes 17 patients diagnosed from 1985 through 2002. The clinical features and responses to treatment were compared between patients with diffuse lung metastases and those with focal lung or mediastinal metastases, and at the end of follow up the results were also compared between disease-free patients and those with persistent chest metastases. RESULTS: The mean age of the 17 patients was 32.2 +/- 19.1 years. After a mean follow up of 89.6 +/- 51.3 months, all 17 patients survived except for one who died of a non-thyroid-related disease. Six of the 17 patients were disease-free at the end of follow up, and eight of the 17 patients became free of chest metastases. The dose of 131I required to cure chest metastases was higher in the patients with diffuse lung uptake than those with focal chest uptake. The primary tumor size and serum thyroglobulin (Tg) level on the first finding of chest metastases differed markedly between disease-free patients and patients with persistent chest metastases. CONCLUSIONS: 131I scans can effectively demonstrate early chest metastases, which are difficult to detect from chest X-ray or computed tomography (CT). The prognosis for patients with papillary thyroid carcinoma with chest metastases detectable only using 131I is favorable. Additionally, the low serum Tg level on the first finding of chest metastases and the small size of the primary tumor may have favorable therapeutic outcomes.

Adolescent↗
PubMedDate not supplied

[Determination of procollagen type III aminopropeptide by a solid phase method using antibodies conjugated with peroxidase or protein A labelled with radioactive iodine].

A solid-phase assay was developed for estimation of procollagen III aminopropeptide which involved both immunoenzymatic and radioimmune procedures. The assay did not require the iodine-labelled aminopropeptide, while content of the antigen was estimated using the conjugate of secondary antibodies and peroxidase or iodine-labelled protein A. Substitution of the protein A for the antibodies conjugate and peroxidase enabled to abolish the radioactive materials use.

Animals↗
PubMed1995

The secretion of radioactive iodine (131J) into the milk of small ruminants following their experimental contamination.

"Peak" levels of radioiodine (131J) in sheep and goats milk were reached between 12-24 hrs following their contamination. At the end of the nine days period for sheep and of 12 days period for goats, following a single contamination with the prescribed 131J dose, the radioiodine level is 0,25% of the contamination dose. Following a multiple biweekly radioiodine contamination, the corresponding radioactivity levels in milk are much higher than in blood. From the fourth day on, the ratio between the respective levels in milk and blood remains constant. Following a biweekly multiple contamination in goats, average concentration of 131J in thyroid is about 220% of the daily contamination dose, whereas the corresponding concentrations in milk and blood are 33% and 5% of the daily contamination dose. The corresponding values in sheep are 140% for thyroid and 26% and 3.5% for milk and blood. Chemicals used as "iodine metabolic inhibitors" do sensibly reduce radioiodine levels in milk, while simultaneously increasing the corresponding levels in blood.

Animals↗
PubMed1998

Outcome of pregnancy after radioactive iodine treatment for well differentiated thyroid carcinomas.

This study sought to determine the outcome of pregnancy in female patients with differentiated thyroid carcinoma who became pregnant after radioactive iodide treatment. A total of 779 female thyroid cancer patients were treated at Chang Gung Medical Center in Linkou between January 1977 and December 1995. The medical records of these patients were reviewed retrospectively. Thirty-seven of these patients had well differentiated thyroid carcinoma receiving 131I treatment and conceived at a mean age of 27.97 +/- 3.49 year-old. A total of 58 pregnancy episodes were recorded during this study period. Among these 37 patients, 3 episodes of artificial abortion, 8 episodes of spontaneous abortion and 2 threatened abortions were observed. These patients delivered a total of 47 babies including 3 premature babies. Seven of these patients conceived within 6 months after the last administration of 131I, including 2 cases within 1 month, 4 cases within 4 months, and 1 patient within 5 months. Of these 7 patients, only one patient who conceived within 6 months after the last administration of 131I (14.3%) had a spontaneous abortion. The present results suggest that previous administration of 131I in female patients with well differentiated thyroid cancer does not result in demonstrable adverse effects in subsequent pregnancies. However, further studies involving long-term follow-up of children delivered by mothers who became pregnant within 6 months after the last administration of 131I is needed to further elucidate the possible chronic effects and sequelae of 131I therapy on subsequent pregnancies.

Abortion, Induced↗