The studies proposed here are planned with a view to contribute to the understanding of thyroid gland physilogy in health and its alterations in diseases of the thyroid as well as of other organs systems. We have recently observed in tissues of man and the rat an inhibitor of binding of thyroid hormones to serum proteins and an inhibitor of phagocytosis of Escherichia Coli by polymorphonuclear leucocytes. Thyroid hormone binding inhibitor (THBI) is also present in serum of patients with nonthyroid illnesses (NTIs). We shall characterize and isolate the THBI and the phagocytosis inhibitor (PI) in the tissues, determine if the two inhibitors are the same or distinct, estimate quantitatively the release of THBI and PI into the circulation of patients with NTIS, study in NTI patients the correlation of serum levels of the inhibitors with laterations in thyroid hormone levels, with severity of NTI, and with mortality. Other studies proposed here deal with i) the nature, sources and biological significance of iodothyronines and their derivatives in health, ii) the nature, basis and significance of changes in metabolism of iodothyronines. More specifically, we shall develop RIAs of 3-monoiodothyronine (3-T1) and thyronine (To) and study their metabolism. We shall examine whether measurements of urinary excretion of To, the ultimate product of iodothyronine metabolism, reflect overall thyroidal secretion of iodothyronines. We shall determine relative effects of various thyroid analogs on iodothyronine monodeiodinases in the tissues to investigate whether or not there is selectivity in the effects of iodothyronines on various tissues. In other studies, we shall investigate the usefulness of iodinated radio-contrast agents, e.g. sodium ipodate (Oragrafin R), which inhibit extrathyroidal monodeiodination of T4 to T3, in the management of hyperthyroidism.

Agency
National Institute of Health (NIH)
Institute
National Institute of Arthritis, Diabetes, Digestive and Kidney Diseases (NIADDK)
Type
Research Project (R01)
Project #
5R01AM016155-14
Application #
3150995
Study Section
Endocrinology Study Section (END)
Project Start
1978-06-01
Project End
1986-06-30
Budget Start
1985-07-01
Budget End
1986-06-30
Support Year
14
Fiscal Year
1985
Total Cost
Indirect Cost
Name
University of California Los Angeles
Department
Type
Schools of Medicine
DUNS #
119132785
City
Los Angeles
State
CA
Country
United States
Zip Code
90095
Chopra, I J; Solomon, D H; Huang, T S (1990) Serum thyrotropin in hospitalized psychiatric patients: evidence for hyperthyrotropinemia as measured by an ultrasensitive thyrotropin assay. Metabolism 39:538-43
Kannan, R; Chopra, I J; Ookhtens, M et al. (1990) Effect of amiodarone on non-deiodinative pathway of thyroid hormone metabolism. Acta Endocrinol (Copenh) 122:249-54
Boado, R J; Chopra, I J (1989) A study of hepatic low Km iodothyronine 5'-monodeiodinase. Endocrinology 124:2245-51
Huang, T S; Chang, Y C; Lee, S H et al. (1989) Visual, brainstem auditory and somatosensory evoked potential abnormalities in thyroid disease. Thyroidology 1:137-42
Klandorf, H; Chua Teco, G N; Chopra, I J (1988) Effect of fatty acid administration on plasma thyroid hormones in the domestic fowl. Gen Comp Endocrinol 70:395-400
Huang, T S; Chopra, I J; Boado, R et al. (1988) Thyroxine inner ring monodeiodinating activity in fetal tissues of the rat. Pediatr Res 23:196-9
Huang, T S; Chopra, I J; Boado, R et al. (1988) Alterations in thyroidal economy in a systemic illness induced by turpentine oil injection to the rat. Acta Endocrinol (Copenh) 117:51-8
Boado, R J; Chopra, I J; Flink, I L et al. (1988) Enzyme binding-inhibiting assay for iodothyronine 5'-monodeiodinase (5'-MD) and its application to isolation of complementary deoxyribonucleic acid clones for the 5'-MD in rat liver. Endocrinology 123:1264-73
Boado, R; Chopra, I J; Huang, T S et al. (1988) A study of pituitary thyrotropin, its subunits, and messenger ribonucleic acids in nonthyroidal illness. Metabolism 37:395-9
Kannan, R; Kato, R; Takikawa, R et al. (1988) Lack of effect of 3,3'5'-triiodothyronine (reverse T3) on cardiac function in the rabbit. Endocr Res 14:227-42

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