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Biomedical subjects

T Miyazaki

Publications and source records attributed to T Miyazaki.

At least 1,027 records · Page 57Linked to original sources
PubMed1982

An assay for antibodies to thyroid plasma membrane using the isotope-labeled protein A.

An assay for detection of serum IgG binding to thyroid membrane using 125I-Protein A was examined. The test serum is incubated with purified thyroid membranes, and the IgG bound to the membrane is detected by its interaction with 125I-Protein A. Most of the bound IgG is not bound to the TSH receptor, because TSH does not induce any appreciable decrease in the binding of the IgG to thyroid membranes. Increased serum IgG binding to thyroid membrane is found in most patients with Graves' disease and Hashimoto's thyroiditis, but not in patients with thyroid cancer or simple goiter. Many sera with positive binding activity showed positive microsomal antibody. Serum IgG binding to thyroid membrane in Graves' disease correlates neither with LATS activity nor thyroglobulin antibody. This finding suggests that TSH receptor is not involved in the reaction. The assay method is useful for measuring the binding immunoglobulin for thyroid membrane that is frequently increased in autoimmune thyroid disease, and the present data provide further support to the concept that thyroid autoimmune disorders are associated with antibodies to thyroid cell surface components.

Cell Membrane↗
PubMed1982

Effect of sodium loading and depletion on cyclic nucleotides in plasma and aorta. Interaction between prostacyclin and cyclic nucleotides.

The present study evaluated the effect of sodium loading and sodium depletion on cAMP and cGMP content of rat aorta. Enhanced generation of prostacyclin (PGI2) in aorta was noticed in sodium loading and sodium-depletion. As PGI2 is potent vasoactive agent, the interaction between PGI2 generation in the aorta and cyclic nucleotide accumulation in the aorta was investigated. Sodium depletion of rats induced the elevation of both cAMP and cGMP in the aorta and of cAMP in plasma. No change in cyclic nucleotides was noticed following sodium loading. These changes in cyclic nucleotides were felt to reflect the fluctuation of vasoactive agents under various sodium metabolism conditions. These observations may indicate that PGI2 is not a major factor in the regulation of cyclic nucleotide metabolism under sodium loading and sodium depletion. The increased accumulation of cAMP and cGMP in rat aorta in sodium depletion may be due to the cumulative effects of PGI2, catecholamine and probably angiotension II which are induced by sodium depletion.

Aldosterone↗
PubMed1982

Measurement of serum thyroxine binding prealbumin in various thyroidal states by radioimmunoassay.

Serum thyroxine binding prealbumin (TBPA) levels in various thyroidal states were examined by radioimmunoassay (RIA). This technique is highly sensitive, accurate and reproducible. The normal mean (+/- 2SD) level of serum TBPA is 26.9 +/- 8.0 mg/dl (29.4 +/- 5.2 in men and 24.9 +/- 7.6 mg/dl in women). Serum TBPA levels in pregnant women were significantly lower than in normal females (P less than 0.05). Serum TBPA levels in patients with untreated hyperthyroidism were 12.9 +/- 4.0 mg/dl (mean +/- SD) and in patients with untreated hypothyroidism were 25.2 +/- 4.7 mg/dl (mean +/- SD). The mean TBPA concentrations in untreated hyperthyroidism were significantly lower than that for normal population (P less than 0.01), but untreated hypothyroidism was almost within normal range. The changes in TBPA levels in hyperthyroidism and hypothyroidism were similar to those in TBG levels. In untreated hyper- and hypothyroidism, restoration to euthyroidism by treatment was uniformly accompanied by a normalization of serum TBPA and TBG levels. A negative correlation between serum thyroid hormone binding protein (TBG and TBPA) and free thyroxine was observed in patients with hyperthyroidism. The coefficient of correlation between TBPA and free thyroxine was -0.80 (P less than 0.01) and between TBG and free thyroxine -0.58 (P less than 0.01). From these experiments it appears that not only TBG but also TBPA may play an important role in the regulation of the free thyroxine concentration in response to various thyroidal states.

Female↗
PubMed1982

Individually distinct tumor-specific cell surface antigen identified by monoclonal antibody on a Rous sarcoma virus-induced mouse tumor.

Hybrid cell lines were prepared by the fusion of BALB/c myeloma P3U-1 cells with the lymphocytes of BALB/c mice that were immunized with syngeneic Rous sarcoma virus (RSV)-induced tumor CSA1M cells. Three clones of the hybrid progeny (3.4B2, 3.4C6, and 3.5C11) produced cytotoxic IgM antibodies against CSA1M cells. One of the clones, 3.5C11, was chosen for analysis of the detailed specificity. Both direct cytotoxicity assays and absorption tests revealed that monoclonal antibody from 3.5C11 was positive only with CSA1M cells and that it failed to react with other tumors, including 20 RSV-induced mouse tumors, and normal cells. The 3.5C11 monoclonal antibody alone, with or without exogenous complement, was suppressive in the therapy of ip injected CSA1M tumor in syngeneic hosts, and significant prolongation in survival was seen in the treated mice. These results clearly showed presence of an individually distinct tumor-specific cell surface antigen on an RSV-induced mouse tumor.

Animals↗