[Basic and clinical studies on bone deposition of 99mTc-labeled hydroxymethylene diphosphonate: a comparison with 99mTc-methylene diphosphonate (author's transl)].
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Biomedical subjects
Publications and source records attributed to T Kaji.
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Using in vivo and in vitro experimental models, the uptake and excretion of 67Ga-citrate in tumor cells and normal cells were studied. The time-lapse accumulation of 67Ga in the tumor of rats bearing Yoshida sarcoma reached its peak 24 h after the administration of 67Ga and gradually decreased thereafter. However, the excretion of 67Ga from the tumor was less than that from normal lung. For culture cells in vitro, the uptake of 67Ga increased with lapse of contact time between 67Ga and the cells, but there was no distinct difference between the results for tumor cells and normal skin fibroblasts. The excretion of 67Ga from the cells tended to decrease with prolongation of the contact time, the excretion from tumor cells being only about 10% after a contact time of 24 h. This indicated a significant delay in excretion in comparison with that of normal skin fibroblasts. This delay in the excretion of 67Ga may be an important factor in the tumor accumulation of 67Ga.
With 9 kinds of available 99mTc-colloid kits for RES imaging, especially from the aspect of RES imaging of the bone marrow, observations were conducted on pH, the presence of free 99mTcO4(-), labelling efficiency, rabbit blood clearance, the uptake in RES, urinary excretion, as well as the scintigraphy with rabbits and clinical cases. Compared to 198Au-colloid, marrow to liver ratio was found to be about the same, but its uptake to the spleen and liver was greater. In particular its urinary excretion was much more marked than 198Au-colloid, and in clinical use the bladder was more often delineated. This fact seems to suggest that it is desirable to develope a 99mTc-colloid more suitabale for the bone marrow scintigraphy.
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Pregnant sows were inoculated with the attenuated strain, TO--163, of swine transmissible gastroenteritis virus. Suckling piglets born from them received challenge inoculation with the virulent virus at 3 days after birth, and examined for ability to prevent infection and the immunoglobulin (Ig) classes of antibody in milk. A pregnant sow was inoculated intramuscularly with a dose of 10(8.0) TCID50 and intranasally with a dose of 10(9.3) TCID50 of attenuated virus. Piglets born from it suffered from diarrhea after challenge inoculation, but none of them died eventually. Their dam was also affected with diarrhea for 4 to 7 days after challenge inoculation of them. Another pregnant sow was inoculated twice with 10(9.3) TCID50 of attenuated virus, first by the intramuscular and secondly by the intranasal route. Of nine piglets born from it, one excreted soft feces after challenge inoculation, but all survived to grow normally. Their dam manifested no clinical symptoms at all after challenge inoculation of them. The higher the titer of virus inoculated into pregnant sows, the higher the neutralizing antibody titer in serum and milk of the sows after farrowing. The puerperal sow which had received two doses of 10(9.3) TCID50 each of attenuated virus by the intramuscular and intranasal route, respectively, presented the highest neutralizing antibody titer of all the inoculated sows. This titer was 2,048 in serum and 14,183 in colostrum immediately after farrowing. In that sow IgG was the main class of immunoglobulins in neutralizing antibody in milk. Even the IgA antibody titer of that sow was higher than that of any other sow which had been administered with virus of low titer. It was 392 and 19 3 and 9 days, respectively, after farrowing.
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