The development of a radioimmunoassay for reverse triiodothyronine sulfate in human serum and amniotic fluid

Journal Article · Tue Jun 01 00:00:00 EDT 1993 · Journal of Clinical Endocrinology and Metabolism; (United States)

DOI:https://doi.org/10.1210/jcem.76.6.8501172· OSTI ID:6179901

Wu, Sing-Yung ^[1]; Huang, Wen-Sheng; Chen, Wei-Lian ^[2]; Polk, D; Reviczky, A; Williams, J III; Chopra, I J; Fisher, D A ^[3]

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1. Veterans Administration Medical Center, Long Beach, CA (United States)
2. Tri-Service General Hospital, Taipei (Taiwan, Province of China)
3. Univ. of California, Los Angeles (United States)

Sulfated iodothyronines including T[sub 4]-sulfate (T[sub 4]S) and T[sub 3]-sulfate (T[sub 3]S) have been identified in human serum and amniotic fluid. Little is know, however, about the existence of sulfate conjugation of reverse T[sub 3] (rT[sub 3]S) in man. In this report, the authors employed a novel, sensitive, and specific rT[sub 3]S RIA to address this question. The rabbit antiserum to rT[sub 3]S was highly specific; T[sub 4], T[sub 3], rT[sub 3], and 3,3'-T[sub 2] showed less than 0.002% cross-reaction with the antiserum. Only T[sub 4]S and T[sub 3]S cross-reacted significantly (0.3% and 0.01%, respectively); other analogs cross-reacted less than 0.0001%. The detection threshold of the RIA was 14 pmol/L (1.0 ng/dL). The mean serum rT[sub 3]S concentration (pmol/L) was 40 in euthyroid subjects. Values were similar in hypothyroid patients (38) and pregnant women (52) but significantly (P < 0.01) elevated to 176 in hyperthyroid patient, 74 in patients with nonthyroid illnesses, and 684 in cord sera of newborns. Serum rT[sub 3]S increased significantly in hyperthyroid patients 1 day after administration of 1 g sodium ipodate orally. Reverse T[sub 3]S was detected consistently in amniotic fluid at 14 to 22 weeks of gestation and showed a marked rise 1-3 weeks after intraamniotic administration of 500-1000 [mu]g T[sub 4]. The various data suggest that : (1) rT[sub 3]S is a normal component of human serum and amniotic fluid; (2) it is derived from metabolism of T[sub 4] or rT[sub 3]; (3) circulating rT[sub 3]S increases in hyperthyroidism and in circumstances where type I 5'-monodeiodinating activity is low, e.g. nonthyroid illnesses, fetal life, and after administration of ipodate. 20 refs., 4 figs.

• OSTI ID: 6179901
• Journal Information: Journal of Clinical Endocrinology and Metabolism; (United States), Vol. 76:6; ISSN 0021-972X
• Country of Publication: United States
• Language: English

Related Subjects

62 RADIOLOGY AND NUCLEAR MEDICINE
SULFATES
RADIOIMMUNOASSAY
THYROXINE
METABOLISM
TRIIODOTHYRONINE
ANTIBODIES
HYPERTHYROIDISM
IODINE 125
AMINO ACIDS
BETA DECAY RADIOISOTOPES
BIOASSAY
CARBOXYLIC ACIDS
DAYS LIVING RADIOISOTOPES
DIAGNOSTIC TECHNIQUES
DISEASES
ELECTRON CAPTURE RADIOISOTOPES
ENDOCRINE DISEASES
HORMONES
IMMUNOASSAY
IMMUNOLOGY
INTERMEDIATE MASS NUCLEI
INTERNAL CONVERSION RADIOISOTOPES
IODINE ISOTOPES
ISOTOPE APPLICATIONS
ISOTOPES
NUCLEI
ODD-EVEN NUCLEI
ORGANIC ACIDS
ORGANIC COMPOUNDS
ORGANIC HALOGEN COMPOUNDS
ORGANIC IODINE COMPOUNDS
OXYGEN COMPOUNDS
PEPTIDE HORMONES
PROTEINS
RADIOASSAY
RADIOIMMUNODETECTION
RADIOIMMUNOLOGY
RADIOISOTOPES
SULFUR COMPOUNDS
THYROID HORMONES
TRACER TECHNIQUES
550601* - Medicine- Unsealed Radionuclides in Diagnostics